JPH0832486A - Spread spectrum modulator / demodulator - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a spread spectrum modulation / demodulation device that is more accurate and smaller than conventional ones, because the conventional automatic frequency control circuit can be eliminated. [Structure] A receiver 1 is provided with a transmitter 2 and a receiver 100.
Reference numeral 00 has a delay detection unit 30 that performs delay detection of the correlation signals from the sliding correlation units 29a and 29b, and a correction unit that determines the influence of frequency deviation from the waveform of the correlation signal and corrects the delay detection output. 103, and further includes a data reproducing section 31 for reproducing data. After extracting frequency deviation information between transmission and reception from phase information of a received signal extracted for data reproduction, correction corresponding to the frequency deviation information is performed. , The deterioration of reproduced data due to frequency deviation is removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spread spectrum modulator / demodulator having a frequency deviation removing circuit.

[0002]

2. Description of the Related Art In recent years, the development of communication devices using spread spectrum technology has been remarkable. A conventional spread spectrum modulator / demodulator will be described below with reference to the drawings.

FIG. 10 is a block diagram showing a conventional spread spectrum modulation / demodulation apparatus. In FIG. 10, 1 is an input signal which is voice data and control data, and 2 is an input signal 1 which is transmitted as a radio frequency (RF) signal. A transmitter for performing 3 is a serial / parallel (S / P) conversion unit for converting a serial signal into a parallel signal, 4 is a differential encoding unit for performing differential encoding with two input signals, and 5a and 5b are input signals. A spreading unit that spreads the signal with an internal pseudo-noise signal sequence, 6
Is a quadrature modulator that modulates two input signals by quadrature,
7a and 7b are multipliers for multiplying two input signals, 8 is a 90-degree phase shifter for shifting the phase by 90 degrees, 9 is an adder for adding two input signals, and 10 is an intermediate frequency (IF) on the transmission side. ) An oscillator that generates a signal, 11 is a wireless transmission unit that modulates and transmits an input signal, 12 is a receiver that receives an RF signal and reproduces data, and 13 is a wireless reception unit that receives and demodulates an RF signal , 14 are transmitter 2 and receiver 1
Automatic frequency control (AF
C) section, 15 is a frequency deviation detecting section for detecting a deviation between the intermediate frequencies of the transmitter and the receiver, 16 is a band pass filter for band limiting, 17 is a squarer for squaring the input signal, 18
Is a bandpass filter that extracts the second harmonic frequency component of the squared signal, 19 is a multiplier that multiplies two input signals, 20 is a frequency offset delimiter that extracts a frequency deviation from a predetermined frequency, Reference numeral 21 is a loop filter that removes noise from the frequency deviation signal, 22 is a voltage controlled oscillator (VCO) that controls the oscillation frequency according to the input voltage, and 23 is a half of the frequency of the input signal 1
/ 2 frequency divider, 24 is a quadrature demodulator that orthogonally demodulates an input signal, 25a and 25b are multipliers that multiply two input signals, 26 is a 90-degree phase shifter that shifts the phase by 90 degrees, and 27a , 27b are low-pass filters for removing higher harmonic components of the quadrature demodulated signal, 28a, 28b are analog / digital (A / D) converters for converting analog signals to digital signals, and 29a, 29b are input signals. And a sliding correlator that performs despreading by pattern matching of the internal pseudo-noise sequence, 30 is a delay detection unit that extracts the phase difference between the current signal and the signal one baud rate before, and 31 is the data reproduction from the phase difference. A data reproducing unit for performing 32, a parallel / serial (P / S) converting unit for converting a parallel signal into a serial signal, and a reproduced data for reproducing 33.

The operation of the conventional spread spectrum modulator / demodulator using PSK modulation configured as described above will be described below. First, the timing of one bit of the input data 1 will be referred to as a bit rate, the timing of twice the bit rate will be referred to as a baud rate, and the timing of one symbol in the spread code will be referred to as a chip rate. Further, the number of symbols of the spread code is 16 chips, the bit rate is 50 kHz,
Baud rate is 25 kHz, chip rate is 400 kHz
And

The input signal 1 input to the transmitter 2 is S /
After the P conversion unit 3 converts every 2 bits into a parallel signal of 2 bits, the differential encoding unit 4 performs differential encoding.
The differentially encoded signal is spread by spreading sections 5a and 5b by the pseudo-noise signal sequences in spreading sections 5a and 5b, respectively, and then an orthogonal modulation section including multipliers 7a and 7b, a 90-degree phase shifter 8 and an adder 9. At 6, the signal is quadrature-modulated with the transmission local signal from the oscillator 10 and becomes a transmission IF signal.
The F signal is converted and transmitted to the receiver 12.

The reception RF signal received by the receiver 12 is converted into a reception IF signal by the radio reception section 13. AFC section 1
The received IF signal input to the frequency deviation detection unit 15 in 4 is band-limited by the band-pass filter 16 and squared by the squarer 17, and the second-harmonic component is extracted by the band-pass filter 18. The output of the bandpass filter 18 at this time becomes a non-modulated signal because the phase component of the pseudo noise signal sequence is removed. The unmodulated signal is multiplied by the signal from the voltage controlled oscillator 22 in the multiplier 19 to perform frequency conversion, and then the frequency offset delimiter 20 extracts the deviation from the predetermined value of the carrier frequency to obtain the error corresponding to the frequency deviation. Generate a voltage signal. Noise is removed from the error voltage signal by the loop filter 21, the voltage controlled oscillator 22 is driven, and the loop circuit tracks in the direction of reducing the frequency deviation. The output frequency of the voltage controlled oscillator 22 is halved by the ½ frequency divider 23.
When set to, the received local signal has a predetermined intermediate frequency (IF). The received local signal is multiplied by two multipliers 25
Quadrature demodulator 24 comprising a, 25b and 90 ° phase shifter 26
When the signal is input to and is subjected to quadrature demodulation with the received IF signal, a two-phase baseband (BB) signal from which frequency deviation is removed is obtained. Then, these two-phase BB signals are quantized by A / D converters 28a and 28b after removing unnecessary harmonics by low-pass filters 27a and 27b, and are input to sliding correlators 29a and 29b. . The sliding correlators 29a and 29b perform pattern matching between the pseudo noise signal sequence held internally and the BB signal (despreading), and latch the output at the timing of the peak of one bit period. The two-phase BB signals latched here are orthogonal to each other and include a phase deviation component serving as information of the received RF signal. Therefore, the delay detection unit 30 extracts the phase deviation component from the two-phase signal, the data reproduction unit 31 determines the data from the phase deviation component, and the P / S conversion unit 32 converts the phase deviation component into a serial signal to reproduce the reproduction data. 33 is output.

Two-phase signals have a phase relationship as shown in FIG. 11, where I is an in-phase component and Q is a quadrature component. Further, the configurations of the S / P conversion unit 3 and the differential encoding unit 4 are shown in FIG. 12, the S / P conversion unit 3 is configured by a D-flip-flop as shown in the figure, and the operation of the differential encoding unit 4 is shown in Table 1. As shown in. Where D is the input signal, CLK-b is the bit rate,
CLK-c is the chip rate, φ is the phase deviation, and Q and I are shown in FIG.
Is the same as

[0008]

[Table 1]

The sliding correlation unit 29 is shown in FIG.
34 is a PN generator that outputs a pseudo noise signal sequence in a chip rate unit, and 35 is a PN generator that compares the input signal and the pseudo noise signal sequence in a doubled chip rate unit. It is an up / down counter that outputs -1 at time and resets in baud rate units, and the output waveform at the time of synchronization is as shown in FIG. 13 (B). The pseudo noise signal sequence per baud rate is 16 chips, and the up / down counter counts at double the chip rate. a is a case where 16 chips match, and b is a case where 16 chips do not match. Tb is one baud rate time.
The differential detection unit 30 is as shown in FIG. 14, and Im = Asi
n θ _m , Qm = Acos θ _m , I ′ = Bcos (θ _m −
θ _m-1 ), Q ′ = B sin (θ _m −θ _m-1 ), I ″ = √2
× Bcos {θ _m −θ _m−1 − (π / 4)}, Q ″ = √2 ×
Bsin {θ _m −θ _m-1 − (π / 4)}, A and B are constants,
Tb is one baud rate time, I is an in-phase signal, and Q is a quadrature signal.

The data reproducing section 31 is as shown in FIG. 15, its operation is shown in Table 2, and Δφ is the reproduced phase deviation information.

[0011]

[Table 2]

[0012]

However, in the above-described conventional spread spectrum modulator / demodulator, the size of the analog large component such as VCO constituting the AFC circuit for removing the frequency deviation is increased, and at the same time, the variation of the analog component is caused. However, there is a problem that the accuracy is deteriorated due to.

The present invention solves such a problem, and an object of the present invention is to provide a spread spectrum modulator / demodulator capable of reducing the size and increasing the accuracy of a frequency deviation removing circuit.

[0014]

A spread spectrum modulation / demodulation apparatus according to a first aspect of the present invention is a differential code section for changing phase information of a transmission two-phase signal according to an input signal and a pseudo noise code for a transmission two-phase signal of 1 bit rate. A transmitter including a spreading unit that spreads according to a sequence, a quadrature modulation unit that performs quadrature modulation of the spread transmission two-phase signal, and a wireless transmission unit that converts the quadrature-modulated intermediate frequency signal into a radio frequency signal and transmits the radio frequency signal. , A radio receiving unit for receiving a radio frequency signal and converting it into an intermediate frequency signal, an orthogonal demodulation unit for performing orthogonal demodulation of the intermediate frequency signal and extracting a received two-phase signal, and a comparator for performing 1-bit quantization of the received two-phase signal Section, a sliding correlation section that despreads the quantized received two-phase signal with a pseudo-noise code sequence and outputs a correlation value, and a phase deviation information between the 1-bit rates of the phase information of the two-phase correlation values. Of the phase difference information by detecting the slope of the signal of the correlation value of the two phases by detecting the difference between the phase deviation information and the quadrature modulation section and the quadrature demodulation section. The receiver is provided with a correction unit that performs correction and a data reproduction unit that reproduces the input signal from the phase deviation information.

A spread spectrum modulation / demodulation apparatus according to a second aspect of the present invention is a differential coding section for changing phase information of a transmission two-phase signal according to an input signal and a spreading section for spreading a transmission two-phase signal of 1 bit rate by a pseudo noise code sequence. A quadrature modulation unit that performs quadrature modulation of the spread transmission two-phase signal; a transmitter that includes a radio transmission unit that converts the quadrature-modulated intermediate frequency signal into a radio frequency signal and transmits the radio frequency signal; Then, a radio receiving unit for converting the received intermediate frequency signal into an intermediate frequency signal, an orthogonal demodulation unit for performing orthogonal demodulation of the intermediate frequency signal to extract a received two-phase signal, a comparator unit for performing 1-bit quantization of the received two-phase signal, and a two-phase received signal A sliding correlator that despreads the signal with a pseudo-noise code sequence and outputs a correlation value; a delay detector that extracts phase deviation information between 1-bit rates of phase information of two-phase correlation values; The maximum value of the correlation value between the 1-bit rates of the phase correlation value is detected, and whether the phase deviation is due to the input signal or the frequency deviation is determined by the position of the maximum value between the 1-bit rates to correct the phase deviation information. The receiver is provided with a correction unit for performing and a data reproducing unit for reproducing the input signal from the phase deviation information.

According to a third aspect of the spread spectrum modulator / demodulator of the present invention, a preamble data generator for outputting preamble data as an input signal, a differential encoder for changing phase information of a two-phase signal according to the input signal, and a two-bit system having a 1-bit rate. A spreading unit that spreads a phase signal with a pseudo-noise code sequence, a quadrature modulation unit that performs quadrature modulation of the spread two-phase signal, and a wireless transmission unit that converts the quadrature-modulated intermediate frequency signal into a radio frequency signal and transmits the radio frequency signal. A transmitter provided, a radio receiving unit for receiving a radio frequency signal and converting it into an intermediate frequency signal, an orthogonal demodulation unit for performing orthogonal demodulation of the intermediate frequency signal and extracting a two-phase signal, and a two-phase signal of two bits or more. An analog / digital conversion unit that performs quantization, a sliding correlation unit that despreads a two-phase signal with a pseudo-noise code sequence and outputs a correlation value, and a phase of the two-phase correlation value A differential detection unit that extracts phase deviation information between 1-bit rates, a frequency deviation storage unit that extracts and stores frequency deviation components from preamble data, and a frequency deviation component is excluded from phase deviation information between 1-bit rates. It is composed of a phase difference extracting section and a receiver including a data reproducing section for reproducing the input signal from the phase deviation information.

According to a fourth aspect of the spread spectrum modulator / demodulator, a preamble data generator for outputting preamble data as an input signal, a differential encoder for changing phase information of a two-phase signal according to the input signal, and a two-bit system having a 1-bit rate. A spreading unit that spreads a phase signal with a pseudo-noise code sequence, a quadrature modulation unit that performs quadrature modulation of the spread two-phase signal, and a wireless transmission unit that converts the quadrature-modulated intermediate frequency signal into a radio frequency signal and transmits the radio frequency signal. A transmitter provided, a radio receiving unit for receiving a radio frequency signal and converting it into an intermediate frequency signal, an orthogonal demodulation unit for performing orthogonal demodulation of the intermediate frequency signal and extracting a two-phase signal, and a two-phase signal of two bits or more. An analog / digital conversion unit that performs quantization, a sliding correlation unit that despreads a two-phase signal with a pseudo-noise code sequence and outputs a correlation value, and a phase of the two-phase correlation value Receiving provided with a delay detection section for extracting phase deviation information between 1-bit-rate information and a data recovery section for switching the data judgment condition from the frequency deviation information obtained from the preamble data and reproducing the input signal from the phase deviation information. It is composed of a machine.

A spread spectrum modulation / demodulation apparatus according to a fifth aspect of the present invention includes a differential code unit that changes phase information of a two-phase signal according to an input signal, and a spread unit that spreads a two-phase signal of 1 bit rate by a pseudo noise code sequence. A quadrature modulation unit that performs quadrature modulation of the spread two-phase signal, a transmitter that includes a radio transmission unit that converts the quadrature-modulated intermediate frequency signal into a radio frequency signal and transmits the radio frequency signal, and an intermediate frequency that receives the radio frequency signal A radio receiving unit for converting into a signal, a quadrature demodulating unit for performing quadrature demodulation of an intermediate frequency signal to extract a two-phase signal, an analog / digital conversion unit for quantizing 2 bits or more of a two-phase signal, and a two-phase signal A sliding correlator for despreading the pseudo-noise code sequence with a pseudo-noise code sequence and outputting a correlation value, a delay detector for extracting phase deviation information between the 1-bit rates of the phase information of the two-phase correlation values, and a frequency deviation A frequency deviation extraction unit that extracts the difference between the reference phase of the determined data and the phase deviation information as a frequency deviation component and a phase difference extraction that excludes the frequency deviation component from the phase deviation information. And a receiver having a data reproducing section for reproducing the input signal from the phase deviation information.

A spread spectrum modulator / demodulator according to a sixth aspect of the present invention comprises a differential code section for changing phase information of a two-phase signal according to an input signal, and a spread section for spreading a two-phase signal of 1 bit rate by a pseudo noise code sequence. A quadrature modulation unit that performs quadrature modulation of the spread two-phase signal, a transmitter that includes a radio transmission unit that converts the quadrature-modulated intermediate frequency signal into a radio frequency signal and transmits the radio frequency signal, and an intermediate frequency that receives the radio frequency signal A radio receiving unit for converting into a signal, a quadrature demodulating unit for performing quadrature demodulation of an intermediate frequency signal to extract a two-phase signal, an analog / digital conversion unit for quantizing 2 bits or more of a two-phase signal, and a two-phase signal A sliding correlator that despreads the pseudo-noise code sequence and outputs a correlation value, and extracts phase deviation information between the 1-bit rate and the 1 / 2-bit rate of the phase information of the two-phase correlation values. A delay detection unit, a frequency deviation extraction unit that extracts a frequency deviation component from phase deviation information between 1 bit rates, a phase difference extraction unit that excludes frequency deviation components from the phase deviation information, and phase deviation information between 1 bit rates 1/2
The receiver is provided with a correction unit that corrects the phase deviation information from the phase difference of the phase deviation information between bit rates, and a receiver that includes a data reproduction unit that reproduces the input signal from the phase deviation information.

According to a seventh aspect of the present invention, there is provided a spread spectrum modulation / demodulation apparatus which comprises a differential code section for changing phase information of a two-phase signal according to an input signal, and a spread section for spreading a two-phase signal of 1 bit rate by a pseudo noise code sequence. A quadrature modulation unit that performs quadrature modulation of the spread two-phase signal, a transmitter that includes a radio transmission unit that converts the quadrature-modulated intermediate frequency signal into a radio frequency signal and transmits the radio frequency signal, and an intermediate frequency that receives the radio frequency signal A radio receiving unit for converting into a signal, a quadrature demodulating unit for performing quadrature demodulation of an intermediate frequency signal to extract a two-phase signal, an analog / digital conversion unit for quantizing 2 bits or more of a two-phase signal, and a two-phase signal A sliding correlator that despreads the pseudo-noise code sequence and outputs a correlation value, and extracts phase deviation information between the 1-bit rate and the 1 / 2-bit rate of the phase information of the two-phase correlation values. A frequency detection unit for extracting a frequency deviation component from phase deviation information between 1 bit rates and a phase deviation information between 1/2 bit rates, and a frequency deviation component from phase deviation information between 1 bit rates. Exclude phase difference extraction unit and phase deviation information between 1 bit rate and 1
A correction unit that compares the frequency deviation components of the phase deviation information between the / 2 bit rates and corrects the phase deviation information according to the polarity of the frequency deviation component, and a data reproduction that reproduces the input signal from the phase deviation information. And a receiver having a section.

According to another aspect of the spread spectrum modulation / demodulation apparatus of the present invention, a first differential code section for changing phase information of the first two-phase signal according to an input signal and a second two-phase signal for the first two-phase signal. Of the second differential code section for changing the phase information of the signal, a spreading section for spreading the second two-phase signal of 1 bit rate by a pseudo-noise code sequence, and a quadrature modulation of the spread second two-phase signal. A quadrature modulation unit that performs, a transmitter that includes a radio transmission unit that converts the quadrature-modulated intermediate frequency signal to a radio frequency signal and transmits the radio frequency signal, a radio reception unit that receives the radio frequency signal and converts the radio frequency signal to an intermediate frequency signal, and an intermediate A quadrature demodulation unit that performs quadrature demodulation of a frequency signal to extract a two-phase signal, an analog / digital conversion unit that quantizes a two-phase signal with 2 bits or more, and a two-phase signal is despread with a pseudo-noise code sequence and correlated A sliding output value Between the correlation unit and the first differential detection unit that extracts phase deviation information between the 1-bit rates of the phase information of the two-phase correlation values, and between the 1-bit rate of the phase deviation information from the first differential detection unit. For extracting the phase deviation information of the second
And a receiver having a data reproducing section for reproducing the input signal from the output of the second differential detecting section.

[0022]

According to the spread spectrum modulation / demodulation apparatus of the first aspect, the transmitter differentially encodes and spreads the input signal and transmits the input signal to the receiver. The receiver performs despreading and differential detection of the received signal. The differential detection output contains a frequency deviation component, and when the product of the frequency deviation components in the phase deviation information exceeds π / 2, the polarity of one of the received two-phase signals is inverted and the slope of the correlation value is inverted. Therefore, the correction unit detects the slope of the signal of the two-phase correlation value and determines whether the phase deviation information is affected by the mismatch (frequency deviation) of the intermediate frequencies of the quadrature modulation unit and the quadrature demodulation unit. When it is determined that the influence of the deviation is received, correction is performed according to the frequency deviation and the input data is reproduced.

As described above, after the frequency deviation information between transmission and reception is extracted from the phase information of the received signal extracted for data reproduction, the correction corresponding to the frequency deviation information is performed to eliminate the deterioration of the reproduction data due to the frequency deviation. Therefore, the conventional automatic frequency control circuit can be dispensed with, and the influence of the frequency deviation can be eliminated by the digital circuit, so that the size can be reduced by integrating the digital circuit and the variation of the analog automatic frequency control circuit can be eliminated. Since it can be eliminated, higher precision is possible.

According to the spread spectrum modulator / demodulator of the second aspect, the product of the frequency deviation components in the phase deviation information is π / 2 while the receiver receives the radio frequency signal from the transmitter and reproduces the input signal. When it exceeds, the polarity of one of the received two-phase signals is inverted, so the correlation value decreases and the position of the peak value moves, so the correction unit determines the peak value between the 1-bit rates of the two-phase correlation values. The phase deviation information is detected and it is determined whether the phase deviation is due to the input signal or the frequency deviation according to the position of the peak value between the 1-bit rates, and the phase deviation information is corrected. Therefore, there is an effect similar to that of claim 1.

According to the spread spectrum modulation / demodulation apparatus of the third aspect, the preamble data is sent from the transmitter to the receiver, the frequency deviation storage section extracts and stores the frequency deviation component from the preamble data, and thereafter the input data is sent and received. The phase difference extraction unit removes the frequency deviation component from the phase deviation information, and therefore has the same effect as in claim 1. According to the spread spectrum modulation / demodulation device of claim 4, the preamble data is sent from the transmitter to the receiver, and the data judgment condition of the data reproducing unit is switched according to the frequency deviation component extracted from the preamble data. Is performed and the data is reproduced in consideration of the frequency deviation component, so that there is the same effect as in claim 1.

According to the spread spectrum modulation / demodulation device of the fifth aspect, the data of the phase deviation information including the frequency deviation component is received by the frequency deviation extraction unit during the reproduction of the data by the receiver receiving the radio frequency signal from the transmitter. The determination is performed, the difference between the reference phase of the determined data and the phase deviation information is output as a frequency deviation component, and the frequency deviation component is removed from the phase deviation information by the phase difference extraction unit. Therefore, there is the same effect as claim 1. .

According to the spread spectrum modulation / demodulation apparatus of the sixth aspect, the phase deviation information between one bit rate and the 1/2 bit is corrected in the correction section during the data reproduction by the receiver receiving the radio frequency signal from the transmitter. Since the phase deviation information is corrected according to the difference in the phase deviation information between the rates, there is the same effect as in claim 1. According to the spread spectrum modulation / demodulation device of claim 7, the phase deviation information between one bit rate and the half bit rate is corrected between the one bit rate and the one half bit rate in the correction unit during the data reproduction by the receiver receiving the radio frequency signal from the transmitter. Since the phase deviation information is corrected according to the polarity of each frequency deviation component of the phase deviation information, there is the same effect as in claim 1.

According to the spread spectrum modulation / demodulation apparatus of the eighth aspect, the differential coding of the input signal is performed twice by the first differential coding section and the second differential coding section in the transmitter, and the differential coding is performed in the receiver. First of
Since the frequency deviation component is removed from the phase deviation information in the process of performing the delay detection twice by the delay detection section and the second delay detection section, there is the same effect as in claim 1.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A spread spectrum modulator / demodulator using QPSK modulation, which is a first embodiment corresponding to claim 1 of the present invention, will be described with reference to FIGS. FIG. 1 is a block diagram of a spread spectrum modulator / demodulator according to a first embodiment. In FIG. 1, 100 is a receiver that receives an RF signal and reproduces data, 101 is an oscillator that generates an intermediate frequency (IF) signal on the receiving side, 102
Reference numerals a and 102b are comparators that perform 1-bit quantization of analog signals, and 103 is a correction unit that detects the slope of the correlation value of two phases and corrects the phase deviation information based on the change in the slope.

FIG. 2 shows the output waveform of the sliding correlator 29. In FIG. 2A, the sum of frequency deviation components is π / 2.
Is less than, the sum of frequency deviation components in (B) and (C) is π.
This is the case when it exceeds / 2. Tb is one baud rate time. In addition, the same effects as those of the conventional example are given the same reference numerals, and the description thereof will be omitted.

The operation of the spread spectrum modulation / demodulation device thus configured will be described. That is, the input signal 1 input to the transmitter 2 is converted into a 2-bit parallel signal in every 2 bits by the S / P conversion unit 3, and then differentially encoded by the differential encoding unit 4. The differentially encoded signal is spread by spreading units 5a and 5b by the pseudo noise signal sequences in spreading units 5a and 5b, respectively, and then an orthogonal modulation unit including multipliers 7a and 7b, a 90-degree phase unit 8 and an adder 9. 6, the transmission IF is quadrature-modulated with the transmission local signal from the oscillator 10.
The signal becomes a signal and is converted into a transmission RF signal by the wireless transmission unit 11 and transmitted to the receiver 12. The reception RF signal received by the receiver 100 is converted into a reception IF signal by the wireless reception unit 13. When the IF signal on the receiving side from the oscillator 101 is input to the quadrature demodulator 24 including the two multipliers 25a and 25b and the 90 ° phase shifter 26 to perform quadrature demodulation with the received IF signal, a frequency deviation of 2 is included. A phase BB signal is obtained. Then, these two-phase BB signals are passed through the low-pass filters 27a and 27a.
After removing unnecessary harmonics in b, the comparator unit 102
1-bit quantization is performed at a and 102b and input to the sliding correlation units 29a and 29b, and despreading is performed at the sliding correlation units 29a and 29b. Despread 2
Since the BB signals of the phases are orthogonal to each other and include the phase which is the information of the received RF signal, the delay detection unit 30 extracts the phase deviation component from the two-phase signals. Here, the phase deviation component shown in FIG. 2 includes a frequency deviation component, and when the sum of the frequency deviation components is less than π / 2, the influence of the frequency deviation component is removed by the comparator units 102a and 102b.
When it exceeds / 2, the in-phase signal output from the comparator unit 102a and the comparator unit 1 are affected by the frequency deviation component.
Since one polarity of the quadrature signal output from 02b is inverted, the phase component is shifted by π / 2 and the input data cannot be accurately reproduced. The correction unit detects the slope of the waveform and detects the phase deviation component output from the delay detection unit 30 when the slope of one of the correlation value of the in-phase signal or the correlation value of the quadrature signal changes during one baud rate time (Tb). The phase deviation component is output to the data reproducing unit 31 by shifting ± π / 2 depending on the direction in which the inclination changes. Data reproduction unit 3
1 determines the data from the phase deviation component, and the P / S converter 3
At 2, the data is converted into a serial signal and reproduced data 33 is output.

As described above, according to the first embodiment, after the frequency deviation information between transmission and reception is extracted from the phase information of the received signal extracted for data reproduction, the correction corresponding to the frequency deviation information is performed, Since the deterioration of the reproduced data due to the frequency deviation is eliminated, the conventional automatic frequency control circuit can be eliminated, and the influence of the frequency deviation can be eliminated by the digital circuit. Since the variation of the automatic frequency control circuit circuit can be eliminated, the accuracy can be improved.

A spread spectrum modulator / demodulator using QPSK modulation according to a second embodiment of the invention will be described with reference to FIG. Figure 3 is the second
3 is a block diagram of a spread spectrum modulation / demodulation device showing an embodiment of FIG. In FIG. 3, 110 is a receiver that receives an RF signal and reproduces data, and 111 is a correction unit that detects the maximum value of the two-phase correlation values and corrects the phase deviation information. In addition, the same effects as those of the conventional example and the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The operation of the spread spectrum modulator / demodulator will be described. The input signal 1 input to the transmitter 2 is S / S.
After the P conversion unit 3 converts every 2 bits into a parallel signal of 2 bits, the differential encoding unit 4 performs differential encoding.
The differentially encoded signal is spread by spreading sections 5a and 5b by the pseudo-noise signal sequences in spreading sections 5a and 5b, respectively, and then an orthogonal modulation section including multipliers 7a and 7b, a 90-degree phase shifter 8 and an adder 9. At 6, the signal is quadrature-modulated with the transmission local signal from the oscillator 10 and becomes a transmission IF signal.
The F signal is converted and transmitted to the receiver 12.

The reception RF signal received by the receiver 110 is converted into a reception IF signal by the radio reception section 13. Oscillator 1
The IF signal from the receiving side from 01 is supplied to two multipliers 25a, 2
When input to the quadrature demodulator 24 composed of 5b and the 90 ° phase shifter 26 and quadrature demodulated with the received IF signal, a two-phase BB signal including a frequency deviation is obtained. Then, after removing unnecessary harmonics from these two-phase BB signals by low-pass filters 27a and 27b, 1-bit quantization is performed by comparators 102a and 102b, and a sliding correlation unit 29a,
29b, and the sliding correlation units 29a, 29 are input.
Despreading occurs at b. The despread two-phase BB signals are orthogonal to each other and include a phase serving as information of the received RF signal. Therefore, the differential detection unit 30 extracts the phase deviation component from the two-phase signals. Here, the phase deviation component shown in FIG. 2 includes a frequency deviation component, and the sum of the frequency deviation components is π / 2.
The effect of the frequency deviation component is less than
However, when π / 2 is exceeded, one of the polarities of the in-phase signal output from the comparator unit 102a and the quadrature signal output from the comparator unit 102b is inverted due to the influence of the frequency deviation component. Therefore, the phase component is shifted by π / 2, and the input data cannot be accurately reproduced. The correction unit detects the peak value of the two-phase correlation value, and the position of the peak value is 0 to Tb / 2, Tb /
2 to Tb-3Tc, where Tb-3Tc to Tb are in three ranges, and when one peak value of the two-phase correlation values is in the range of 0 to Tb-3Tc, the peak value of the correlation value The phase deviation component is output to the data reproducing unit 31 by shifting ± π, / 2 depending on the position. The data reproducing unit 31 determines the data from the phase deviation component, the P / S converting unit 32 converts the data into a serial signal, and outputs the reproduced data 33. Therefore, the same effect as that of the first embodiment is obtained.

A spread spectrum modulation / demodulation apparatus using QPSK modulation according to a third embodiment of the present invention will be described with reference to FIG. FIG. 4 is a block diagram of a spread spectrum modulation / demodulation apparatus showing a third embodiment. In FIG. 4, 120 is a transmitter for transmitting an input signal as an RF signal, 121 is a preamble data input section for inputting preamble data, 122 is a preamble data generator for generating preamble data,
A receiver 123 receives an RF signal and reproduces data,
Reference numeral 124 is a preamble data receiving unit that takes in preamble data and extracts a frequency deviation component, 125 is a frequency deviation storage unit that stores the frequency deviation component, and 126 is a difference between the phase deviation component and the frequency deviation component including the frequency deviation component of one baud rate time. Is a phase difference extraction unit that extracts In addition, the same reference numerals are given to those having the same effects as those of the conventional example and the above-described embodiment, and the description thereof will be omitted.

The operation of this spread spectrum modulation / demodulation apparatus will be described. The transmitter 120 inputs preamble data (all 0s) from the preamble data input section 121 to the S / P conversion section 3. Preamble data is S
The / P converter 3 converts every 2 bits into a 2-bit parallel signal, and then the differential encoder 4 performs differential encoding. Here, since the input data becomes 0, the phase component does not change in the differential encoder. The differentially encoded signal is used by the spreading unit 5
a and 5b are spread by the pseudo noise signal sequences in the spreading units 5a and 5b, respectively, and then are multiplied by the multipliers 7a and 7b and the 90-degree phase shifter 8
The quadrature modulator 6 including the adder 9 quadrature-modulates the transmission local signal from the oscillator 10 into a transmission IF signal, which is converted into a transmission RF signal by the wireless transmission unit 11 and transmitted to the receiver 12. The reception RF signal received by the receiver 123 is converted into a reception IF signal by the wireless reception unit 13. Oscillator 10
The IF signal from the receiving side from 1 is supplied to two multipliers 25a and 25a.
It is input to a quadrature demodulator 24 composed of b and a 90 ° phase shifter 26, quadrature demodulated with the received IF signal, and converted into a BB signal.
These two-phase BB signals are passed through the low-pass filters 27a, 2a.
After removing unnecessary harmonics by 7b, the A / D converter 28a,
Quantization is performed at 28b, and a sliding correlation unit 29a,
29b, and the sliding correlation units 29a, 29 are input.
Despreading occurs at b. Since the despread two-phase BB signals are orthogonal to each other and include a phase serving as information of the received RF signal, the differential detection unit 30 extracts the phase deviation component from the two-phase signals. Since the phase deviation due to the preamble data is 0, the signal extracted by the differential detection unit 30 has only the frequency deviation component. The extracted frequency deviation component is stored in the frequency deviation storage unit 125, and is switched to the input of the input data 1 of the preamble data in the transmitter 120. The input data 1 is converted into a 2-bit parallel signal every 2 bits by the S / P conversion unit 3 and then differentially encoded by the differential encoding unit 4. The differentially encoded signal is transmitted to the spreader 5a,
5b is spread by the pseudo noise signal sequences in the spreading units 5a and 5b, respectively, and then is transmitted by the quadrature modulation unit 6 including the multipliers 7a and 7b, the 90-degree phase shifter 8 and the adder 9 to the transmission local signal from the oscillator 10 and the quadrature modulation. Then, it becomes a transmission IF signal, is converted into a transmission RF signal by the wireless transmission unit 11, and is transmitted to the receiver 12.

The reception RF signal received by the receiver 123 is converted into a reception IF signal by the radio reception section 13. Oscillator 1
The IF signal from the receiving side from 01 is supplied to two multipliers 25a, 2
When input to the quadrature demodulator 24 composed of 5b and the 90 ° phase shifter 26 and quadrature demodulated with the received IF signal, a two-phase BB signal including a frequency deviation is obtained. Then, these two-phase BB signals are quantized by the A / D converters 28a and 28b after removing unnecessary harmonics by the low-pass filters 27a and 27b, and input to the sliding correlation units 29a and 29b, Despreading is performed in the sliding correlation units 29a and 29b. The differential detection unit 30 extracts the phase deviation component including the frequency deviation from the despread two-phase BB signal, and the phase deviation extraction unit 126 extracts the phase deviation component and the frequency deviation stored in the frequency deviation storage unit 125. The difference between the components is calculated and the frequency deviation component is removed. The data reproducing unit 31 determines data from the phase deviation component from which the frequency deviation component has been removed, and P
Playback data 33 converted into a serial signal by the / S converter 32
Is output.

Therefore, the third embodiment has the same operational effect as the first embodiment. The third embodiment can also be applied to a modulator / demodulator that does not use spread spectrum. A spread spectrum modulator / demodulator using QPSK modulation according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 5 is a block diagram of a spread spectrum modulator / demodulator according to a fourth embodiment. In FIG. 5, reference numeral 130 is a receiver that receives an RF signal and reproduces data, and 131 is a data reproduction unit that switches the data determination condition based on the wave number deviation component extracted by the preamble data. In addition, the same reference numerals are given to those having the same effects as those of the conventional example and the above-described embodiment, and the description thereof will be omitted.

The operation of this spread spectrum modulation / demodulation apparatus will be described. In the transmitter 120, preamble data (all 0s) is input from the preamble data input section 121 to the S / P conversion section 3. The preamble data is converted into a 2-bit parallel signal for every 2 bits by the S / P conversion unit 3 and then differentially encoded by the differential encoding unit 4. Here, since the input data becomes 0, the phase component does not change in the differential encoder. The differentially encoded signal is spread by spreading sections 5a and 5b by the pseudo-noise signal sequences in spreading sections 5a and 5b, respectively, and then an orthogonal modulation section including multipliers 7a and 7b, a 90-degree phase shifter 8 and an adder 9. At 6, the signal is quadrature-modulated with the transmission local signal from the oscillator 10 and becomes a transmission IF signal.
Is converted into a transmission RF signal and transmitted to the receiver 12.

The received RF signal received by the receiver 123 is converted into a received IF signal by the wireless receiver 13. Oscillator 1
The IF signal on the receiving side from 20 is supplied to two multipliers 25a, 2a
It is input to the quadrature demodulator 24 consisting of 5b and a 90 ° phase shifter 26 to perform quadrature demodulation on the received IF signal and convert it into a BB signal. These two-phase BB signals are passed through the low pass filter 27.
After removing unnecessary harmonics with a and 27b, A / D converter 2
Quantization is performed by 8a and 28b, and the sliding correlation unit 2
9a and 29b, and the sliding correlation unit 29 is input.
Despreading is performed at a and 29b. Despread two-phase B
Since the B signal is orthogonal and includes the phase that is the information of the received RF signal, the delay detection unit 30 extracts the phase deviation component from the two-phase signal. Since the phase deviation due to the preamble data is 0, the signal extracted by the differential detection unit 30 has only the frequency deviation component. The data reproducing unit 126 switches the data reproducing table according to the frequency deviation component, and the transmitter 120 switches to the input of the input data 1 of the preamble data. The input data 1 is converted by the S / P conversion unit 3 into 2-bit parallel signals every 2 bits, and then differentially encoded by the differential encoding unit 4. The differentially encoded signals are spread by spreading units 5a and 5b by pseudo noise signal sequences in spreading units 5a and 5b, respectively, and then multipliers 7a, 7b and 90 are used.
The quadrature modulator 6 including the phase shifter 8 and the adder 9
The transmission local signal from 0 is quadrature-modulated to form a transmission IF signal, which is converted into a transmission RF signal by the wireless transmission unit 11 and transmitted to the receiver 12.

The reception RF signal received by the receiver 123 is converted into a reception IF signal by the radio reception section 13. Oscillator 1
The IF signal from the receiving side from 01 is supplied to two multipliers 25a, 2
When input to the quadrature demodulator 24 composed of 5b and the 90 ° phase shifter 26 and quadrature demodulated with the received IF signal, a two-phase BB signal including a frequency deviation is obtained. Then, these two-phase BB signals are quantized by A / D converters 28a and 28b after removing unnecessary harmonics by low-pass filters 27a and 27b, and input to sliding correlation units 29a and 29b. Despreading is performed in the sliding correlation units 29a and 29b. The delay detection unit 30 extracts a phase deviation component including a frequency deviation from the despread two-phase BB signal,
The data reproduction unit 131 determines the data in consideration of the frequency deviation component, and the P / S conversion unit 32 converts the data into a serial signal and outputs the reproduction data 33.

Therefore, the fourth embodiment has the same operational effect as the first embodiment. The fourth embodiment can also be applied to a modulator / demodulator that does not use spread spectrum. A spread spectrum modulation / demodulation apparatus using QPSK modulation which is a fifth embodiment corresponding to claim 5 of the present invention will be described with reference to FIG. Figure 6
FIG. 8 is a block diagram of a spread spectrum modulation / demodulation device showing a fifth embodiment. In FIG. 6, 140 is a receiver that receives an RF signal and reproduces data, 141 is a phase deviation component including a frequency deviation component of 1 baud rate time, and data judgment is performed, and a phase deviation component corresponding to the judged data is determined. It is a frequency deviation extraction unit that extracts a difference between phase deviation components including a frequency deviation component as a frequency deviation component. In addition, the same reference numerals are given to those having the same effects as those of the conventional example and the above-described embodiment, and the description thereof will be omitted.

The operation of the spread spectrum modulator / demodulator will be described. The input signal 1 input to the transmitter 2 is S / S.
After the P conversion unit 3 converts every 2 bits into a parallel signal of 2 bits, the differential encoding unit 4 performs differential encoding.
The differentially encoded signal is spread by spreading sections 5a and 5b by the pseudo-noise signal sequences in spreading sections 5a and 5b, respectively, and then an orthogonal modulation section including multipliers 7a and 7b, a 90-degree phase shifter 8 and an adder 9. At 6, the signal is quadrature-modulated with the transmission local signal from the oscillator 10 and becomes a transmission IF signal.
The F signal is converted and transmitted to the receiver 12.

The reception RF signal received by the receiver 140 is converted into a reception IF signal by the radio reception section 13. Oscillator 1
The IF signal from the receiving side from 01 is supplied to two multipliers 25a, 2
When input to the quadrature demodulator 24 composed of 5b and the 90 ° phase shifter 26 and quadrature demodulated with the received IF signal, a two-phase BB signal including a frequency deviation is obtained. Then, these two-phase BB signals are quantized by A / D converters 102a and 102b after removing unnecessary harmonics by low-pass filters 27a and 27b, and input to sliding correlation units 29a and 29b. Despreading is performed in the sliding correlation units 29a and 29b. The delay detection unit 30 is a dephased two-phase BB.
The phase shift deviation component including the frequency deviation is extracted from the signal. The frequency deviation extraction unit 141 performs data determination based on the phase shift deviation component including the frequency deviation component. The reference phase of the data is π
Since it is an integer multiple of / 2, the difference between the phase component corresponding to the determined data and the phase deviation component including the frequency deviation component is extracted as the frequency deviation component. The phase deviation extraction unit 126 takes the difference between the phase deviation component and the frequency deviation component and removes the frequency deviation component. The data reproducing unit 31 determines the data from the phase deviation component from which the frequency deviation component has been removed, and the P / S conversion unit 32 converts the data into a serial signal and outputs the reproduction data 33.

Therefore, the fifth embodiment has the same operational effect as the first embodiment. A spread spectrum modulator / demodulator using QPSK modulation according to a sixth embodiment of the present invention will be described with reference to FIG. FIG. 7 is a block diagram of a spread spectrum modulation / demodulation apparatus showing a sixth embodiment. In FIG. 7, 150 is RF
A receiver that receives a signal and reproduces data, 151 is a delay detection unit that extracts a phase difference component of 1/2 baud rate time and a phase deviation component of 1 baud rate time from the immediately preceding signal, 1
Reference numeral 52 is a frequency deviation extraction unit for extracting a phase deviation component of 1/2 baud rate time and a frequency deviation component of phase deviation component of 1 baud rate time, and 153 is a frequency deviation component of 1/2 baud rate time and a frequency deviation component of 1 baud rate time. A correction signal extraction unit that compares components and extracts a correction signal is a correction unit that corrects a phase difference component including a frequency deviation component by the correction signal. In addition, the same reference numerals are given to those having the same effects as those of the conventional example and the above-described embodiment, and the description thereof will be omitted.

The operation of the spread spectrum modulation / demodulation apparatus thus configured will be described. The input signal 1 input to the transmitter 2 is input to the S / P conversion unit 3 in units of 2 bits every 2 bits.
After being converted into a bit parallel signal, the differential encoding unit 4
Differential encoding is performed in. The differentially encoded signal is spread by spreading sections 5a and 5b by the pseudo-noise signal sequences in spreading sections 5a and 5b, respectively, and then an orthogonal modulation section including multipliers 7a and 7b, a 90-degree phase shifter 8 and an adder 9. In 6 a quadrature modulation is performed with the transmission local signal from the oscillator 10 to form a transmission IF signal, which is converted into a transmission RF signal in the wireless transmission section 11 and is then received by the receiver
2 is sent.

The reception RF signal received by the receiver 150 is converted into a reception IF signal by the radio reception section 13. Oscillator 1
The IF signal from the receiving side from 01 is supplied to two multipliers 25a, 2
When input to the quadrature demodulator 24 composed of 5b and the 90 ° phase shifter 26 and quadrature demodulated with the received IF signal, a two-phase BB signal including a frequency deviation is obtained. Then, these two-phase BB signals are quantized by A / D converters 102a and 102b after removing unnecessary harmonics by low-pass filters 27a and 27b, and input to sliding correlation units 29a and 29b. Despreading is performed in the sliding correlation units 29a and 29b. The delay detection unit 151 uses the despread 2-phase B signal.
A phase deviation component including a frequency deviation of 1/2 baud rate time and a phase deviation component including a frequency deviation of 1 baud rate time are output from the B signal in a time division manner. The frequency deviation extraction unit 152 sends the frequency deviation of the half baud rate time of the quadrature component and the frequency deviation of the one baud rate time of the quadrature component to the correction signal extraction unit 153, and outputs the frequency deviation of the one baud rate time of the in-phase component and the quadrature component. It is sent to the phase deviation extraction unit 126. When the frequency deviation component is π / 4 or more and less than π / 2, the phase deviation data determination range including the frequency deviation component has a phase deviation including the frequency deviation component of 1/2 baud rate time and the frequency deviation of the phase difference of 1 baud rate time. Since the phase deviation including the component is different, when the frequency deviation extracting unit 152 extracts the frequency deviation, the polarities of the orthogonal components of the frequency deviation are different between the 1/2 baud rate time and the 1 baud rate time. Therefore, when the polarities of the frequency deviations of the ½ baud rate time and the 1 baud rate time of the quadrature component are different, the correction signal extraction unit 153 outputs the correction signal according to the polarity. The phase deviation extraction unit 126 takes the difference between the phase deviation component including the frequency deviation component of one baud rate time sent from the differential detection unit 151 and the frequency deviation component of the one baud rate time sent from the frequency deviation extraction unit, The frequency deviation component is removed. The correction unit corrects the phase deviation component by shifting it by 0 or ± π / 2 according to the correction signal.

The data reproducing section 31 judges data from the phase deviation component from which the frequency deviation component has been removed, and the P / S conversion section 3
At 2, the data is converted into a serial signal and reproduced data 33 is output.
Therefore, the sixth embodiment widens the dynamic range of correction for the frequency deviation component of the fifth embodiment from ± π / 4 to ± π / 2, and has the same effect as the first embodiment.

A spread spectrum modulation / demodulation apparatus using QPSK modulation according to a seventh embodiment of the present invention will be described with reference to FIG. FIG. 8 is a block diagram of a spread spectrum modulator / demodulator according to the seventh embodiment. In FIG. 8, 160 is a receiver for receiving an RF signal and reproducing data, 161 is a difference between a phase deviation component including a frequency deviation component of 1 baud rate time and a phase difference component including a frequency deviation component of 1/2 baud rate time. Is output and a correction signal extraction unit that outputs a correction signal depending on whether or not the difference exceeds π / 8, and a correction unit 162 that corrects the phase signal according to the correction signal. In addition, the same reference numerals are given to those having the same effects as those of the conventional example and the above-described embodiment, and the description thereof will be omitted.

The operation of the spread spectrum modulator / demodulator thus constructed will be described. The input signal 1 input to the transmitter 2 is converted into a 2-bit parallel signal by the S / P conversion unit 3 every 2 bits. After that, differential encoding is performed by the differential encoding unit 4. The differentially encoded signals are spread by spreading units 5a and 5b by pseudo noise signal sequences in spreading units 5a and 5b, respectively, and then orthogonal modulation units composed of multipliers 7a and 7b, 90-degree phase shifter 8 and adder 9. At 6, it is quadrature-modulated with the transmission local signal from the oscillator 10 to become a transmission IF signal,
The wireless transmission unit 11 converts the RF signal into a transmission RF signal and transmits the RF signal to the receiver 12.

The reception RF signal received by the receiver 160 is converted into a reception IF signal by the radio reception section 13. Oscillator 1
01 from the reception side IF signal to two multipliers 25a, 2
When input to the quadrature demodulator 24 composed of 5b and the 90 ° phase shifter 26 and quadrature demodulated with the received IF signal, a two-phase BB signal including a frequency deviation is obtained. Then, these two-phase BB signals are quantized by A / D converters 102a and 102b after removing unnecessary harmonics by low-pass filters 27a and 27b, and input to sliding correlation units 29a and 29b. Despreading is performed in the sliding correlation units 29a and 29b. The delay detection unit 151 uses the despread 2-phase B signal.
A phase deviation component including a frequency deviation of 1/2 baud rate time and a phase deviation component including a frequency deviation of 1 baud rate time are output from the B signal by time division. Frequency deviation component is π
/ 4 or more and less than π / 2, the difference between the phase deviation component including the frequency deviation component of the 1/2 baud rate time and the phase deviation including the frequency deviation component of the one baud rate time is π / 8.
Therefore, the correction signal extraction unit 153 extracts the difference of the phase difference components including the frequency deviation between the 1/2 baud rate time and the 1 baud rate time, and when it exceeds π / 8, the frequency deviation component exceeds π / 4. Then, the correction signal is output. The frequency deviation extraction unit 141 sends the frequency deviation component of one baud rate time to the phase deviation extraction unit 126. Phase deviation extraction unit 12
Reference numeral 6 represents the difference between the phase deviation component including the frequency deviation component of 1 baud rate time and the frequency deviation component of 1 baud rate time sent from the frequency deviation extraction unit, and removes the frequency deviation component. The correction unit sets the phase deviation component to 0 according to the correction signal.
Or shift ± π / 2 and apply correction. Data reproduction unit 3
1 determines data from the phase deviation component from which the frequency deviation component has been removed, converts the data into a serial signal by the P / S converter 32, and outputs the reproduction data 33.

Therefore, in the seventh embodiment, the dynamic range of correction for the frequency deviation component of the fifth embodiment is expanded from ± π / 4 to ± π / 2, and in addition, the same effect as the first embodiment is obtained. is there. A spread spectrum modulator / demodulator using QPSK modulation according to an eighth embodiment of the present invention will be described with reference to FIG.
FIG. 9 is a block diagram of a spread spectrum modulator / demodulator according to the eighth embodiment. In FIG. 9, 170 is a receiver that receives an RF signal and reproduces data. In addition, the same reference numerals are given to those having the same effects as those of the conventional example and the above-described embodiment, and the description thereof will be omitted.

The operation of this spread spectrum modulator / demodulator will be described. The input signal 1 input to the transmitter 2 is S / S.
After being converted into a 2-bit parallel signal every 2 bits by the P conversion unit 3, differential encoding is performed by the first differential encoding unit 4a. The differentially encoded signal is the second differential encoding unit 4b.
Is input to the above, differential encoding is performed, and after being spread by the pseudo noise signal sequences in the spreading units 5a and 5b in the spreading units 5a and 5b, respectively, the multipliers 7a and 7b, the 90-degree phase shifter 8 and the adder 9
The quadrature modulator 6 composed of the quadrature modulator quadrature-modulates the transmission local signal from the oscillator 10 to form a transmission IF signal.
At 1, the signal is converted into a transmission RF signal and transmitted to the receiver 12.

The reception RF signal received by the receiver 170 is converted into a reception IF signal by the radio reception section 13. Oscillator 1
The IF signal from the receiving side from 01 is supplied to two multipliers 25a, 2
When input to the quadrature demodulator 24 composed of 5b and the 90 ° phase shifter 26 and quadrature demodulated with the received IF signal, a two-phase BB signal including a frequency deviation is obtained. Then, these two-phase BB signals are quantized by A / D converters 102a and 102b after removing unnecessary harmonics by low-pass filters 27a and 27b, and input to sliding correlation units 29a and 29b. Despreading is performed in the sliding correlation units 29a and 29b. The first differential detection unit 30a is despread to 2
When the phase deviation component including the frequency deviation is extracted from the phase BB signal and the phase deviation component including the frequency deviation component is differentially detected by the second differential detection unit 30b, the frequency deviation component of one baud rate time is obtained. Is constant, the frequency deviation component is removed, and only the phase deviation component due to the input data 1 can be extracted. The data reproducing unit 31 determines the data from the phase deviation component from which the frequency deviation component has been removed, and P /
The S converter 32 converts the signal into a serial signal and outputs the reproduction data 33.

Therefore, the eighth embodiment has the same operational effect as the first embodiment. The eighth embodiment can also be applied to a modulator / demodulator that does not use spread spectrum.

[0057]

According to the spread spectrum modulation / demodulation apparatus of the first aspect, the frequency deviation information between transmission and reception is extracted from the phase information of the received signal extracted for data reproduction, and the correction corresponding to the frequency deviation information is performed. , Since the deterioration of the reproduced data due to the frequency deviation is removed, the conventional automatic frequency control circuit can be eliminated, and the influence of the frequency deviation can be removed by the digital circuit, so that the size can be reduced by integrating the digital circuit. Since the variation of the analog automatic frequency control circuit can be eliminated, there is an effect that high precision can be achieved.

According to the spread spectrum modulator / demodulator of the second aspect, the product of the frequency deviation components in the phase deviation information is π / 2 while the receiver receives the radio frequency signal from the transmitter and reproduces the input signal. When it exceeds, the polarity of one of the received two-phase signals is inverted, so the correlation value decreases and the position of the peak value moves, so the correction unit determines the peak value between the 1-bit rates of the two-phase correlation values. The phase deviation information is detected and it is determined whether the phase deviation is due to the input signal or the frequency deviation according to the position of the peak value between the 1-bit rates, and the phase deviation information is corrected. Therefore, there is an effect similar to that of claim 1.

According to the spread spectrum modulation / demodulation apparatus of the third aspect, the preamble data is sent from the transmitter to the receiver, the frequency deviation storage unit extracts and stores the frequency deviation component from the preamble data, and thereafter transmits and receives the input data. Since the phase difference extraction unit removes the frequency deviation component from the phase deviation information, the same effect as in claim 1 can be obtained. According to the spread spectrum modulation / demodulation device of claim 4, the preamble data is sent from the transmitter to the receiver, and the data judgment condition of the data reproducing unit is switched according to the frequency deviation component extracted from the preamble data. Is performed and the data is reproduced in consideration of the frequency deviation component, the same effect as that of claim 1 is obtained.

According to the spread spectrum modulation / demodulation apparatus of the fifth aspect, the data of the phase deviation information including the frequency deviation component is received by the frequency deviation extraction unit while the receiver receives the radio frequency signal from the transmitter and reproduces the data. Since the determination is performed and the difference between the reference phase of the determined data and the phase deviation information is output as the frequency deviation component, and the frequency deviation component is removed from the phase deviation information by the phase difference extraction unit, the same effect as claim 1 is obtained. .

According to the spread spectrum modulation / demodulation apparatus of the sixth aspect, the phase deviation information between one bit rate and the 1/2 bit is corrected in the correction section during the data reception by the receiver receiving the radio frequency signal from the transmitter. Since the phase deviation information is corrected according to the difference in the phase deviation information between the rates, there is the same effect as in claim 1. According to the spread spectrum modulation / demodulation device of claim 7, the phase deviation information between one bit rate and the half bit rate is corrected between the one bit rate and the one half bit rate in the correction unit during the data reproduction by the receiver receiving the radio frequency signal from the transmitter. Since the phase deviation information is corrected according to the polarity of each frequency deviation component of the phase deviation information, there is the same effect as claim 1.

According to the spread spectrum modulation / demodulation apparatus of the eighth aspect, the differential coding of the input signal is performed twice by the first differential coding section and the second differential coding section in the transmitter, and the differential coding is performed in the receiver. First of
Since the frequency deviation component is removed from the phase deviation information in the process of performing the delay detection twice by the delay detection unit and the second delay detection unit, the same effect as claim 1 is obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a spread spectrum modulation / demodulation apparatus in a first embodiment corresponding to claim 1 of the present invention.

FIG. 2 is a despread output waveform diagram of the spread spectrum modulator / demodulator.

FIG. 3 is a block diagram showing a configuration of a spread spectrum modulation / demodulation apparatus according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a spread spectrum modulation / demodulation device according to a third embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a spread spectrum modulation / demodulation apparatus according to a fourth embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a spread spectrum modulation / demodulation device in a fifth embodiment corresponding to claim 5;

FIG. 7 is a block diagram showing the configuration of a spread spectrum modulation / demodulation device in a sixth embodiment corresponding to claim 6;

FIG. 8 is a block diagram showing a configuration of a spread spectrum modulation / demodulation device in a seventh embodiment corresponding to claim 7;

FIG. 9 is a block diagram showing the configuration of a spread spectrum modulation / demodulation apparatus according to an eighth embodiment of the present invention.

FIG. 10 is a block diagram showing a configuration of a spread spectrum modulation / demodulation device in a conventional example.

FIG. 11 is a phase diagram showing a phase relationship of two-phase signals of the spread spectrum modulation / demodulation device.

FIG. 12 is a block diagram showing a configuration of an S / P conversion unit and a differential encoding unit of the spread spectrum modulation / demodulation device.

FIG. 13 is a block diagram showing a configuration of a sliding correlator of a conventional spread spectrum modulation / demodulation device.

FIG. 14 is a block diagram showing a configuration of a delay detection unit of a spread spectrum modulation / demodulation device of a conventional example.

FIG. 15 is a block diagram showing a configuration of a data reproducing unit of a spread spectrum modulation / demodulation device of a conventional example.

[Explanation of symbols]

 4 differential encoding unit 5 spreading unit 6 orthogonal modulation unit 11 wireless transmission unit 13 wireless reception unit 24 orthogonal demodulation unit 28 A / D conversion unit 29 sliding correlation unit 30 delay detection unit 31 data reproduction unit 102a, 102b comparator unit 103 correction unit

Claims (8)

[Claims] 1. A differential encoding unit that changes phase information of a transmission two-phase signal according to an input signal, a spreading unit that spreads the transmission two-phase signal at a 1-bit rate with a pseudo-noise code sequence, and the spread transmission. A quadrature modulation unit that performs quadrature modulation of a two-phase signal, a transmitter that includes a radio transmission unit that converts the quadrature-modulated intermediate frequency signal into a radio frequency signal and transmits the radio frequency signal, and receives the radio frequency signal and converts the radio frequency signal into the intermediate frequency signal Wireless reception unit that performs quadrature demodulation of the intermediate frequency signal
A quadrature demodulation unit for extracting a phase signal and one of the received two-phase signals
A comparator unit which performs bit quantization, a sliding correlation unit which despreads the quantized received two-phase signal with a pseudo-noise code sequence and outputs a correlation value, and one bit rate of phase information of the two-phase correlation value. And a delay detection unit that extracts phase deviation information between the two, and detects whether the phase deviation information is affected by the frequency deviation of the intermediate frequency between the quadrature modulation unit and the quadrature demodulation unit by detecting the slope of the signal of the correlation value of two phases. A spread spectrum modulation / demodulation device comprising a correction unit that makes a determination and corrects the phase deviation information, and a receiver that includes a data reproduction unit that reproduces an input signal from the phase deviation information. 2. A differential encoding section for changing phase information of a transmission two-phase signal according to an input signal, a spreading section for spreading the transmission two-phase signal of 1 bit rate by a pseudo-noise code sequence, and the spread transmission. A quadrature modulation unit that performs quadrature modulation of a two-phase signal, a transmitter that includes a radio transmission unit that converts the quadrature-modulated intermediate frequency signal into a radio frequency signal and transmits the radio frequency signal, and receives the radio frequency signal and converts the radio frequency signal into the intermediate frequency signal Wireless reception unit that performs quadrature demodulation of the intermediate frequency signal
A quadrature demodulation unit for extracting a phase signal and one of the received two-phase signals
A comparator unit that performs bit quantization, a sliding correlation unit that despreads the received two-phase signal with a pseudo-noise code sequence and outputs a correlation value, and one of phase information of the two-phase correlation values.
A differential detection unit that extracts phase deviation information between bit rates and a maximum value of correlation values between 1-bit rates of the two-phase correlation values, and a phase deviation is input according to the position of the maximum value between 1-bit rates. Spread spectrum composed of a correction unit that determines whether the signal is a frequency deviation or a frequency deviation and corrects the phase deviation information, and a receiver that includes a data reproduction unit that reproduces an input signal from the phase deviation information. Modulator / demodulator. 3. A preamble data generator that outputs preamble data as an input signal, a differential encoder that changes phase information of a two-phase signal according to the input signal, and 1
A spreading unit that spreads the two-phase signal having a bit rate by a pseudo-noise code sequence, a quadrature modulation unit that performs quadrature modulation of the spread two-phase signal, and converts the quadrature-modulated intermediate frequency signal into a radio frequency signal. A transmitter having a wireless transmission unit for transmitting; a wireless reception unit for receiving a radio frequency signal and converting it into an intermediate frequency signal;
A quadrature demodulation section for extracting a phase signal, an analog / digital conversion section for quantizing 2 bits or more of the 2-phase signal, and 2
A sliding correlator for despreading a phase signal with a pseudo-noise code sequence and outputting a correlation value, a delay detector for extracting phase deviation information between 1 bit rates of phase information of the correlation values of two phases, and preamble data A frequency deviation storage unit that extracts and stores the frequency deviation component, a phase difference extraction unit that removes the frequency deviation component from the phase deviation information between 1 bit rates, and a data reproducing unit that reproduces the input signal from the phase deviation information. And a spread spectrum modulation / demodulation device including a receiver. 4. A preamble data generator for outputting preamble data as an input signal, a differential encoder for changing phase information of a two-phase signal according to the input signal, and a pseudo-noise code sequence for the two-phase signal of 1 bit rate. A transmitter that includes a spreader unit that spreads the signal, a quadrature modulator that performs quadrature modulation of the spread two-phase signal, and a radio transmitter that converts the quadrature-modulated intermediate frequency signal into a radio frequency signal and transmits the radio frequency signal, A radio receiving unit for receiving a radio frequency signal and converting it into an intermediate frequency signal, an orthogonal demodulation unit for performing orthogonal demodulation of the intermediate frequency signal and extracting a two-phase signal, and performing quantization of two bits or more of the two-phase signal. An analog / digital converter, and the above 2
A sliding correlator for despreading a phase signal with a pseudo-noise code sequence and outputting a correlation value, a delay detector for extracting phase deviation information between 1 bit rates of phase information of the correlation values of two phases, and preamble data A spread spectrum modulation / demodulation device comprising a receiver having a data reproducing section for switching a data judgment condition from the obtained frequency deviation information and reproducing an input signal from the phase deviation information. 5. A differential code section for changing phase information of a two-phase signal according to an input signal, a spreading section for spreading the two-phase signal of 1 bit rate by a pseudo noise code sequence, and a spread two-phase signal. A transmitter having a quadrature modulation unit that performs quadrature modulation, a radio transmission unit that converts the quadrature-modulated intermediate frequency signal into a radio frequency signal and transmits the radio frequency signal, and a radio reception unit that receives the radio frequency signal and converts the radio frequency signal into the intermediate frequency signal A quadrature demodulation unit that performs quadrature demodulation of the intermediate frequency signal to extract a two-phase signal; an analog / digital conversion unit that quantizes the two-phase signal by 2 bits or more;
A sliding correlation unit that despreads the phase signal with a pseudo-noise code sequence and outputs a correlation value, a delay detection unit that extracts phase deviation information between 1 bit rates of phase information of the correlation values of two phases, and a frequency deviation A frequency deviation extraction unit that extracts the difference between the reference phase of the determined data and the phase deviation information as a frequency deviation component by determining the data of the phase deviation information including a component, and a position that excludes the frequency deviation component from the phase deviation information. A spread spectrum modulation / demodulation device comprising a phase difference extraction section and a receiver including a data reproduction section for reproducing an input signal from the phase deviation information. 6. A differential code section for changing phase information of a two-phase signal according to an input signal, a spreading section for spreading the two-phase signal of 1 bit rate by a pseudo-noise code sequence, and the spread two-phase signal. A quadrature modulator that performs quadrature modulation, a transmitter that includes a radio transmitter that converts a quadrature-modulated intermediate frequency signal into a radio frequency signal and transmits the radio frequency signal, and a radio receiver that receives the radio frequency signal and converts the radio frequency signal into an intermediate frequency signal A quadrature demodulation unit that quadrature demodulates the intermediate frequency signal to extract a two-phase signal; an analog / digital conversion unit that quantizes the two-phase signal by 2 bits or more;
A sliding correlation unit that despreads a phase signal with a pseudo-noise code sequence and outputs a correlation value, and extracts phase deviation information between the 1-bit rate and the 1 / 2-bit rate of the phase information of the correlation values of the two phases. A differential detection unit, a frequency deviation extraction unit that extracts a frequency deviation component from the phase deviation information between 1 bit rates, a phase difference extraction unit that removes the frequency deviation component from the phase deviation information, and a phase between 1 bit rates. From a receiver that includes a correction unit that corrects the phase deviation information from the phase difference between the deviation information and the phase deviation information between the 1/2 bit rate, and a data reproduction unit that reproduces the input signal from the phase deviation information. A configured spread spectrum modulator / demodulator. 7. A differential code section for changing phase information of a two-phase signal according to an input signal, a spreading section for spreading the two-phase signal of 1 bit rate by a pseudo-noise code sequence, and the spread two-phase signal. A quadrature modulator that performs quadrature modulation, a transmitter that includes a radio transmitter that converts a quadrature-modulated intermediate frequency signal into a radio frequency signal and transmits the radio frequency signal, and a radio receiver that receives the radio frequency signal and converts the radio frequency signal into an intermediate frequency signal A quadrature demodulation unit that quadrature demodulates the intermediate frequency signal to extract a two-phase signal; an analog / digital conversion unit that quantizes the two-phase signal by 2 bits or more;
A sliding correlation unit that despreads a phase signal with a pseudo-noise code sequence and outputs a correlation value, and extracts phase deviation information between the 1-bit rate and the 1 / 2-bit rate of the phase information of the correlation values of the two phases. A differential detection unit, a frequency deviation extraction unit that extracts a frequency deviation component from the phase deviation information between 1 bit rates and the phase deviation information between 1/2 bit rates, and the frequency deviation extraction unit from the phase deviation information between 1 bit rates The phase difference extracting unit excluding the frequency deviation component is compared with the frequency deviation components of the phase deviation information between one bit rate and the phase deviation information between one-half bit rates to determine the polarity of the frequency deviation component. According to the phase deviation information, and a receiver equipped with a data reproducing section for reproducing the input signal from the phase deviation information. Adjusting unit. 8. A first differential encoding section for changing phase information of a first two-phase signal according to an input signal, and a first differential encoding section for changing phase information of a second two-phase signal by the first two-phase signal. Two differential code sections, a spreading section that spreads the second two-phase signal of 1 bit rate by a pseudo-noise code sequence, and a quadrature modulation section that performs quadrature modulation of the spread second two-phase signal. A transmitter provided with a wireless transmission unit for converting an orthogonally modulated intermediate frequency signal into a radio frequency signal and transmitting the radio frequency signal; a radio receiving unit for receiving the radio frequency signal and converting the radio frequency signal into the intermediate frequency signal; A quadrature demodulation unit that demodulates and extracts a two-phase signal; an analog / digital conversion unit that quantizes the two-phase signal by 2 bits or more;
A sliding correlation unit that despreads the phase signal with a pseudo-noise code sequence and outputs a correlation value; and a first differential detection unit that extracts phase deviation information between the 1-bit rates of the phase information of the correlation values of two phases. , A second delay detection unit for extracting phase deviation information between the 1-bit rates of the phase deviation information from the first delay detection unit, and reproduction of an input signal from the output of the second delay detection unit. A spread spectrum modulator / demodulator configured by a receiver having a data reproducing unit.