WO2016127653A1 - Procédé et appareil pour réaliser une communication sans fil en lumière visible - Google Patents

Procédé et appareil pour réaliser une communication sans fil en lumière visible Download PDF

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WO2016127653A1
WO2016127653A1 PCT/CN2015/090968 CN2015090968W WO2016127653A1 WO 2016127653 A1 WO2016127653 A1 WO 2016127653A1 CN 2015090968 W CN2015090968 W CN 2015090968W WO 2016127653 A1 WO2016127653 A1 WO 2016127653A1
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signal
frequency domain
imaginary part
estimated value
real
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Chinese (zh)
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宗柏青
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/116—Visible light communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/06—DC level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection

Definitions

  • This document relates to the technical field of implementing visible light wireless communication, and more particularly to a method and apparatus for implementing visible light wireless communication.
  • the visible light wireless communication system faces some challenges.
  • the low-pass characteristics of the light-emitting diode (LED) lamp and the dispersion characteristics of the visible light wireless channel cause inter-symbol interference (ISI) in high-speed visible light wireless communication.
  • ISI inter-symbol interference
  • OFDM Orthogonal Frequency Division Multiplexing
  • PAM-FDE Single Amplitude Modulated Frequency Domain Equalization
  • IM Intensity Modulation
  • DD Direct Detection
  • DCO-OFDM achieves high-speed transmission of data at the expense of power
  • ACO-OFDM achieves power efficiency by sacrificing the number of modulated subcarriers (ie, high-speed transmission of victim data)
  • PAM-DMT is The effectiveness of the power is achieved by sacrificing the dimensions of the modulation constellation (ie, the high speed transmission of the victim data).
  • MIMO Multiple-Input and Multiple-Output
  • a related art visible light wireless communication method based on a conventional MIMO-OFDM system generally includes:
  • the transmitting end performs Quadrature Amplitude Modulation (QAM) on the signal to be transmitted in each antenna channel, converts the modulated signal into a parallel signal, performs conjugate processing on the parallel signal, and performs parallel processing on the conjugated signal.
  • QAM Quadrature Amplitude Modulation
  • IFFT inverse fast Fourier transform
  • DAC Digital to Analog Converter
  • the receiving end receives the signal, performs fast Fourier transform (FFT, Fast Fourier Transform) on the received signal to obtain a frequency domain signal of the received signal, and adopts a linear minimum mean square error (MMSE) according to the frequency domain signal of the received signal. , Minimum Mean Square Error)
  • FFT fast Fourier transform
  • MMSE linear minimum mean square error
  • the receiving algorithm obtains an estimate of the frequency domain signal transmitted by each antenna.
  • the technical problem to be solved by the present invention is to provide a method and apparatus for implementing visible light wireless communication to reduce the amount of calculation in the visible light wireless communication method and reduce the power of the transmitting end.
  • a method for implementing visible light wireless communication, applied to a transmitting end comprising:
  • the analog signal of the real signal and the analog signal of the imaginary signal are trimmed and transmitted.
  • the step of modulating the signal to be sent includes: the transmitting end performs orthogonal amplitude modulation QAM on the signal to be transmitted.
  • the step of performing IFFT on the parallel signal to obtain the time domain signal includes:
  • x(n) is the time domain signal
  • X(K) is the parallel signal
  • K is a subcarrier subscript
  • 2N is the length of the discrete Fourier inverse transform IDFT
  • n is a sampling instant
  • the step of separating the real part and the imaginary part of the OFDM processed serial signal to obtain a real part signal and an imaginary part signal comprises:
  • x'(n) is the serial signal
  • x Im (n) is the imaginary part signal
  • x Re (n) is the real part signal
  • the step of trimming the analog signal of the real signal and the analog signal of the imaginary signal includes:
  • s 1 (n) is an analog signal of the trimmed imaginary part signal
  • s 2 (n) is an analog signal of the trimmed real part signal
  • x' Im (n) is an analog signal of the imaginary part signal
  • x' Re (n) is the analog signal of the real signal.
  • a method for implementing visible light wireless communication, applied to a receiving end comprising:
  • the estimated value of the frequency domain signal of the signal to be transmitted is obtained according to the estimated value of the frequency domain signal of the real part signal and the estimated value of the frequency domain signal of the imaginary part signal.
  • the step of acquiring the estimated value of the frequency domain signal of the real part signal and the estimated value of the frequency domain signal of the imaginary part signal according to the frequency domain signal of the received signal includes:
  • the step of acquiring the estimated value of the frequency domain signal of the real part signal and the estimated value of the frequency domain signal of the imaginary part signal by using the minimum mean square error MMSE receiving algorithm according to the frequency domain signal of the received signal includes:
  • H 1,1 (K) is The frequency domain representation
  • H 1,2 (K) is The frequency domain indicates that H 2,1 (K) is The frequency domain representation
  • H 2,2 (K) is Frequency domain representation
  • the step of acquiring the estimated value of the frequency domain signal of the signal to be transmitted according to the estimated value of the frequency domain signal of the real part signal and the estimated value of the frequency domain signal of the imaginary part signal includes:
  • Im ⁇ represents the imaginary part.
  • a transmitting device includes a modulation module, a first conversion module, a first conversion module, a second conversion module, a processing module, a separation module, a first analog-to-digital conversion module, a second analog-to-digital conversion module, a first trimming module, and a Two trimming modules, where:
  • the modulation module is configured to: modulate a signal to be transmitted;
  • the first conversion module is configured to: convert the modulated signal into a parallel signal
  • the first transform module is configured to perform an inverse fast Fourier transform IFFT on the parallel signal to obtain a time domain signal
  • the second conversion module is configured to: convert the time domain signal into a serial signal
  • the processing module is configured to: perform cyclic prefix processing on the serial signal;
  • the separation module is configured to: separate the real part and the imaginary part of the processed serial signal to obtain a real part signal and an imaginary part signal;
  • the first analog-to-digital conversion module is configured to: perform a digital-to-analog conversion on the real signal to obtain a real part Analog signal of the signal;
  • the second analog-to-digital conversion module is configured to: perform an analog signal on the imaginary part signal to obtain an imaginary part signal by the DAC;
  • the first trimming module is configured to: trim and transmit an analog signal of a real signal
  • the second trimming module is configured to: trim and transmit an analog signal of the imaginary part signal.
  • the modulation module is configured to modulate a signal to be transmitted in a manner of performing quadrature amplitude modulation QAM on the signal to be transmitted.
  • the first transform module is configured to perform an inverse fast Fourier transform IFFT on the parallel signal to obtain a time domain signal according to the formula:
  • x(n) is the time domain signal
  • X(K) is the parallel signal
  • K is a subcarrier subscript
  • 2N is the length of the discrete Fourier inverse transform IDFT
  • n is a sampling instant
  • the separating module is configured to separate the real part and the imaginary part of the processed serial signal into a real part signal and an imaginary part signal according to the following manner:
  • x(n) is the serial signal
  • x Im (n) is the imaginary part signal
  • x Re (n) is the real part signal
  • s 1 (n) is the analog signal of the trimmed imaginary part signal
  • s 2 (n) is the analog signal of the trimmed real part signal
  • x Im (n) is the analog signal of the imaginary part signal
  • x Re (n) is an analog signal of the real part signal.
  • a receiving device includes a receiving module, a second transform module, a first acquiring module, and a second acquiring module, where:
  • the receiving module is configured to: receive a signal
  • the second transform module is configured to: perform fast Fourier transform FFT on the received signal to obtain a frequency domain signal of the received signal;
  • the first acquiring module is configured to: obtain an estimated value of the frequency domain signal of the real part signal and an estimated value of the frequency domain signal of the imaginary part signal according to the frequency domain signal of the received signal;
  • the second acquiring module is configured to: obtain an estimated value of the frequency domain signal of the signal to be transmitted according to the estimated value of the frequency domain signal of the real part signal and the estimated value of the frequency domain signal of the imaginary part signal.
  • the first acquiring module is configured to obtain an estimated value of the frequency domain signal of the real part signal and an estimated value of the frequency domain signal of the imaginary part signal according to the frequency domain signal of the received signal as follows:
  • I is the variance of P Re (K) or F Re (K) or P Im (K) or F Im (K)
  • I 2 is a unit matrix of rank 2
  • Y 1 (K) is received by the first PD a frequency domain signal of the signal
  • Y 2 (K) is a frequency domain signal of the signal received by the second PD;
  • H 1,1 (K) is The frequency domain representation
  • H 1,2 (K) is The frequency domain indicates that H 2,1 (K) is The frequency domain representation
  • H 2,2 (K) is Frequency domain representation
  • the second acquiring module is configured to obtain an estimated value of the frequency domain signal of the signal to be transmitted according to the estimated value of the frequency domain signal of the real part signal and the estimated value of the frequency domain signal of the imaginary part signal according to the following manner:
  • Im ⁇ represents the imaginary part.
  • a communication device comprising:
  • the technical solution of the present invention includes: modulating a signal to be transmitted at a transmitting end, converting the modulated signal into a parallel signal, performing IFFT on the parallel signal to obtain a time domain signal, and converting the time domain signal into a serial signal.
  • the serial signal is subjected to cyclic prefix processing, and the processed serial signal is separated from the real part and the imaginary part to obtain a real part signal and an imaginary part signal, and the real part signal and the imaginary part signal are respectively subjected to DAC to obtain a real part signal.
  • the analog signal of the analog signal and the imaginary part signal, and the analog signal of the real part signal and the analog signal of the imaginary part signal are trimmed and transmitted.
  • FIG. 1 is a schematic diagram of a communication method of a system for transmitting two antennas by two antennas according to the related art
  • FIG. 2 is a flowchart of a method for implementing communication according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of an IFFT at 16 o'clock according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a transmitting apparatus according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a receiving apparatus according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a signal sent by a transmitting end according to an embodiment of the present invention.
  • Figure 7 is a schematic diagram of the position of the transmitter and the receiver
  • bit error rate (BER, bit error) obtained by simulation and analysis of a MIMO (Real and imaginary coefficient separation) MIMO-OFDM system according to an embodiment of the present invention
  • FIG. 9 is a schematic diagram of a BER of each communication system according to an embodiment of the present invention.
  • an embodiment of the present invention provides a method for implementing communication, including:
  • Step 200 The transmitting end modulates the signal to be transmitted, converts the modulated signal into a parallel signal, performs IFFT on the parallel signal to obtain a time domain signal, converts the time domain signal into a serial signal, and adds a cyclic prefix to the serial signal. Processing, the processed serial signal is separated into a real part and an imaginary part to obtain a real part signal and an imaginary part signal, and the real signal and the imaginary part signal are respectively subjected to a DAC to obtain an analog signal of the real part signal and an analog signal of the imaginary part signal. The analog signal of the real signal and the analog signal of the imaginary signal are trimmed and transmitted.
  • the transmitting end only needs to perform IFFT once during the signal transmission, which reduces the amount of calculation, and does not require an external DC offset, thereby reducing the power of the transmitting end.
  • the signal to be sent by the transmitting end is modulated, and the signal to be sent by the sending end is sent by the sending end. No. QAM.
  • performing IFFT on the parallel signal to obtain the time domain signal includes:
  • the time domain signal is obtained by performing IFFT on the parallel signal according to formula (1).
  • x(n) is the time domain signal
  • X(K) is the parallel signal
  • K is the subscript subscript
  • 2N is the length of the Inverse Discrete Fourier Transform (IDFT)
  • n is the sampling moment.
  • Figure 3 is a schematic diagram of a 16-point IFFT. As shown in FIG. 3, when the IFFT calculation is performed, since only half of the calculation is required for each calculation, the amount of calculation is reduced.
  • the real signal and the imaginary part of the serial signal after the OFDM processing are separated to obtain a real part signal and an imaginary part signal, including:
  • the OFDM-processed serial signal is separated into a real part and an imaginary part to obtain a real part signal and an imaginary part signal.
  • x'(n) is the serial signal
  • x Im (n) is the imaginary part signal
  • x Re (n) is the real part signal
  • trimming the analog signal of the real signal and the analog signal of the imaginary signal include:
  • the analog signal of the real signal and the analog signal of the imaginary signal are trimmed according to formula (4).
  • s 1 (n) is the analog signal of the trimmed imaginary part signal
  • s 2 (n) is the analog signal of the trimmed real part signal
  • x Im (n) is the analog signal of the imaginary part signal
  • x Re ( n) is the analog signal of the real part signal.
  • the method of the embodiment of the present invention further includes:
  • Step 201 The receiving end receives the signal, performs FFT on the received signal to obtain a frequency domain signal of the received signal, and obtains an estimate of the frequency domain signal of the real part signal and a frequency of the imaginary part signal according to the frequency domain signal of the received signal.
  • the estimation of the domain signal obtains an estimate of the frequency domain signal of the signal to be transmitted based on the estimation of the frequency domain signal of the real part signal and the estimation of the frequency domain signal of the imaginary part signal.
  • the signal received by the receiving end can be expressed by the formula (5).
  • y 1 (n) is the signal received by the first PD
  • y 2 (n) is the signal received by the second PD
  • w 1 (n) is the noise of the first PD
  • the mean is 0.
  • Variance is Gaussian noise
  • w 2 (n) is the noise of the second PD, with a mean of 0 and a variance of Gaussian noise.
  • W 1 (K) is the frequency domain representation of w 1 (n), with a mean of 0 and a variance of Gaussian random variable
  • W 2 (K) is the frequency domain representation of w 2 (n), with a mean of 0 and a variance of Gaussian random variable.
  • the estimation of the frequency domain signal of the real part signal is obtained according to the frequency domain signal of the received signal.
  • the estimating of the frequency domain signal of the imaginary part signal comprises: obtaining an estimate of the frequency domain signal of the real part signal and an estimation of the frequency domain signal of the imaginary part signal by using the MMSE receiving algorithm according to the frequency domain signal of the received signal. Specifically include:
  • the estimation of the frequency domain signal of the real part signal and the estimation of the frequency domain signal of the imaginary part signal are obtained according to formula (7).
  • H 1,1 (K) is The frequency domain representation
  • H 1,2 (K) is The frequency domain indicates that H 2,1 (K) is The frequency domain representation
  • H 2,2 (K) is The frequency domain representation.
  • the estimation of the frequency domain signal of the signal to be transmitted according to the estimation of the frequency domain signal of the real part signal and the estimation of the frequency domain signal of the imaginary part signal includes:
  • the rate is Where R RIS is the rate of the system and M is the modulation order.
  • the discrete Fourier transform (DFT, Discrete Fourier Transform) of x Im (n) can be expressed by the formula (15).
  • the DFT of x Re (n) can be expressed by the formula (16).
  • an embodiment of the present invention further provides a sending apparatus, including at least:
  • the modulation module 401 is configured to: modulate a signal to be transmitted;
  • the first conversion module 402 is configured to: convert the modulated signal into a parallel signal
  • the first transform module 403 is configured to: perform inverse fast Fourier transform IFFT on the parallel signal to obtain a time domain signal;
  • the second conversion module 404 is configured to: convert the time domain signal into a serial signal
  • the processing module 405 is configured to: perform cyclic prefix processing on the serial signal;
  • the separation module 406 is configured to: the processed serial signal is separated from the real part and the imaginary part to obtain a real part signal and an imaginary part signal;
  • the first analog-to-digital conversion module 407 is configured to: perform a digital-to-analog conversion DAC on the real part signal to obtain an analog signal of the real part signal;
  • the second analog-to-digital conversion module 408 is configured to: perform imaginary signal on the imaginary signal by the DAC Analog signal
  • the first trimming module 409 is configured to: trim and send the analog signal of the real signal
  • the second trimming module 4010 is configured to: trim and transmit the analog signal of the imaginary part signal.
  • the modulating module is specifically configured to perform orthogonal amplitude modulation QAM on the signal to be transmitted.
  • the first transform module 403 is specifically configured to: according to a formula
  • x(n) is the time domain signal
  • X(K) is the parallel signal
  • K is a subcarrier subscript
  • 2N is the length of the discrete Fourier inverse transform IDFT
  • n is a sampling instant
  • the separating module 406 is specifically configured to:
  • x(n) is the serial signal
  • x Im (n) is the imaginary part signal
  • x Re (n) is the real part signal
  • s 1 (n) is the analog signal of the trimmed imaginary part signal
  • s 2 (n) is the analog signal of the trimmed real part signal
  • x Im (n) is the analog signal of the imaginary part signal
  • x Re (n) is an analog signal of the real part signal.
  • an embodiment of the present invention further provides a receiving apparatus, including at least:
  • the receiving module 501 is configured to: receive a signal
  • the second transform module 502 is configured to: perform fast Fourier transform FFT on the received signal to obtain a frequency domain signal of the received signal;
  • the first obtaining module 503 is configured to: obtain an estimate of the frequency domain signal of the real part signal and an estimate of the frequency domain signal of the imaginary part signal according to the frequency domain signal of the received signal;
  • the second obtaining module 504 is configured to: obtain an estimate of the frequency domain signal of the signal to be transmitted according to the estimation of the frequency domain signal of the real part signal and the estimation of the frequency domain signal of the imaginary part signal.
  • the first acquiring module 503 is specifically configured to:
  • I is the variance of P Re (K) or F Re (K) or P Im (K) or F Im (K)
  • I 2 is a unit matrix of rank 2
  • Y 1 (K) is received by the first PD a frequency domain signal of the signal
  • Y 2 (K) is a frequency domain signal of the signal received by the second PD;
  • H 1,1 (K) is The frequency domain representation
  • H 1,2 (K) is The frequency domain indicates that H 2,1 (K) is The frequency domain representation
  • H 2,2 (K) is Frequency domain representation
  • the second acquiring module 504 is specifically configured to:
  • the transmitting device and the receiving device of the embodiment of the present invention may be disposed in the same entity.
  • FIG. 6 is a schematic diagram of a signal sent by a transmitting end according to an embodiment of the present invention.
  • the number of frequency points 2N used for OFDM is set to 512, and the used bandwidth is 100 megahertz (MHz), so the frequency interval between two adjacent frequency points is 100/512 MHz, and the OFDM symbol time T s For 5.12 microseconds ( ⁇ s), the number of guard intervals is 8, which means that the delay spread of the channel is less than 80 nanoseconds (ns).
  • QAM uses 4-QAM, 16-QAM and 64-QAM, and the corresponding transmission rate is:
  • T g is the guard interval
  • the 4-QAM corresponds to a rate of 100 megabits per second (Mbps)
  • the 16-QAM corresponds to a rate of 200 Mbps
  • the 64-QAM corresponds to a rate of 300 Mbps.
  • Figure 7 is a schematic diagram of the location of the transmitter and receiver. As shown in FIG. 7, the number of transmitting antennas and the number of receiving antennas are both two.
  • the corresponding channel response can be expressed as Where ⁇ i,j is the DC gain of the channel between the jth LED and the ith PD, Ds i,j is the channel rms delay spread of the jth LED to the ith PD (assumed to be 8 ns).
  • Table 1 shows the values of ⁇ i,j .
  • the signal to noise ratio is defined as the optical power according to the optical power.
  • Figure 8 shows the bit error rate (BER) obtained by simulation and analysis of MIMO (Real and imaginary coefficient separation) MIMO. As shown in Figure 8, the BER of 4-QAM is better than that of 16-QAM, and the BER of 16-QAM is better than 64-QAM. It can be seen from the figure that the analysis results are consistent with the simulation results.
  • BER bit error rate
  • Figure 9 is a schematic diagram of the BER of each communication system. As shown in FIG. 9, the BER of the method of the embodiment of the present invention is optimal with respect to 4-PAM-DMT 2 ⁇ 2 MIMO and 16-QAM 2 ⁇ 2 MIMO ACO-OFDM.
  • the embodiment of the invention further discloses a computer program, comprising program instructions, when the program instruction is executed by the transmitting device, so that the transmitting device can perform any method of implementing visible light wireless communication on the transmitting side.
  • the embodiment of the invention also discloses a carrier carrying the computer program.
  • the embodiment of the invention further discloses a computer program, comprising program instructions, when the program instruction is executed by the receiving device, so that the receiving device can perform the method of implementing visible light wireless communication on any of the receiving end sides.
  • the embodiment of the invention also discloses a carrier carrying the computer program.
  • the transmitting end only needs to perform IFFT once in the process of transmitting the signal, which reduces the amount of calculation, and does not need an external DC offset, thereby reducing the power of the transmitting end. Therefore, the present invention has strong industrial applicability.

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Abstract

Procédé et appareil pour réaliser une communication sans fil en lumière visible. Le procédé comportant les étapes suivantes: une extrémité émettrice module un signal à émettre et le convertit en un signal parallèle, effectue une IFFT sur le signal parallèle pour obtenir un signal dans le domaine temporel, convertit le signal dans le domaine temporel en un signal série et effectue un traitement d'ajout de prémélange cyclique, sépare une partie réelle d'une partie imaginaire du signal série traité, effectue respectivement une CNA sur le signal de partie réelle et le signal de partie imaginaire pour obtenir un signal analogique du signal de partie réelle et un signal analogique du signal de partie imaginaire, et élague le signal analogique du signal de partie réelle et le signal analogique du signal de partie imaginaire et les émet. Au moyen de la solution technique de la présente invention, la quantité de calculs est réduite, et la puissance d'une extrémité émettrice est réduite.
PCT/CN2015/090968 2015-02-15 2015-09-28 Procédé et appareil pour réaliser une communication sans fil en lumière visible Ceased WO2016127653A1 (fr)

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CN103259598A (zh) * 2013-05-21 2013-08-21 桂林电子科技大学 基于ira码的ofdm光纤无线通信方法和系统
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CN111431836B (zh) * 2020-03-30 2023-02-28 长城信息股份有限公司 用于512路子载波ofdm无线通信中基带波形的构建方法及系统
CN111934766A (zh) * 2020-06-15 2020-11-13 中山大学 一种可见光通信系统
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