WO2012051860A1 - 广播定位信号信号生成方法及装置、定位方法及装置 - Google Patents

广播定位信号信号生成方法及装置、定位方法及装置 Download PDF

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Publication number
WO2012051860A1
WO2012051860A1 PCT/CN2011/075458 CN2011075458W WO2012051860A1 WO 2012051860 A1 WO2012051860 A1 WO 2012051860A1 CN 2011075458 W CN2011075458 W CN 2011075458W WO 2012051860 A1 WO2012051860 A1 WO 2012051860A1
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WIPO (PCT)
Prior art keywords
signal
module
spread spectrum
broadcast positioning
broadcast
Prior art date
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Ceased
Application number
PCT/CN2011/075458
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English (en)
French (fr)
Inventor
邓中亮
吕子平
施浒立
关维国
余彦培
李合敏
来奇峰
邓耀宇
刘雯
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BEIJING SHOUKEXINTONG SCIENCE AND Tech CO Ltd
Beijing University of Posts and Telecommunications
Original Assignee
BEIJING SHOUKEXINTONG SCIENCE AND Tech CO Ltd
Beijing University of Posts and Telecommunications
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Application filed by BEIJING SHOUKEXINTONG SCIENCE AND Tech CO Ltd, Beijing University of Posts and Telecommunications filed Critical BEIJING SHOUKEXINTONG SCIENCE AND Tech CO Ltd
Priority to US13/879,949 priority Critical patent/US8917755B2/en
Priority to EP11833766.6A priority patent/EP2632101B1/en
Priority to ES11833766T priority patent/ES2786100T3/es
Priority to JP2013533074A priority patent/JP5714113B2/ja
Publication of WO2012051860A1 publication Critical patent/WO2012051860A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements

Definitions

  • the present invention relates to the field of mobile broadcast television technologies, and in particular, to a broadcast positioning signal generating method, a positioning method and a device. Background technique
  • the positioning technologies in the prior art mainly include: GPS (Global Positioning System) positioning, mobile terminal base station positioning, and the like.
  • the present invention provides a method for generating a broadcast positioning signal, a positioning method, and a broadcast positioning signal generating device, in order to accurately locate and solve the problem that the GPS positioning method in the prior art and the mobile terminal base station positioning method are costly and occupy communication resources. , exciters and transmitters.
  • the technical solution is as follows:
  • the embodiment of the invention provides a method for generating a broadcast positioning signal, and the method includes:
  • the transmission identification signal of each time slot of the OFDM signal and the first synchronization signal connected to the transmission identification signal one or more of the spread spectrum modulated signals are inserted, and one or one
  • the first spreading code is specifically - after a predetermined number of spread spectrum modulated signals are filled between the transmission identification signal of each time slot of the OFDM signal and the first synchronization signal connected to the transmission identification signal, Insert the first spreading code.
  • the method further includes:
  • An embodiment of the present invention further provides a positioning method, such as the foregoing method for generating a broadcast positioning signal, where the positioning method includes:
  • the transmitting end generates a broadcast positioning signal and performs broadcasting
  • the receiving end locates the receiving end according to the received broadcast positioning signal broadcast by at least three different transmitting ends and the coordinates of the three different transmitting ends.
  • the embodiment of the present invention further provides a broadcast positioning signal generating apparatus, where the broadcast positioning signal generating apparatus includes: a coded modulation module, configured to receive a data stream, perform forward error correction coding and orthogonal frequency division on the data stream. Multiplexing OFDM modulation to generate an OFDM signal;
  • a spreading code generating module configured to generate a first spreading code
  • a spread spectrum modulation module configured to perform spectral spread modulation on the preset teletext bit information according to the first spreading code to generate a spread spectrum modulated signal
  • An interstitial framing module configured to receive an OFDM signal output by the coded modulation module, a first spreading code sent by the spreading code generating module, and a spread spectrum modulated signal sent by the spread spectrum modulation module, and transmit in each time slot of the OFDM signal Between the identification signal and the first synchronization signal connected to the transmission identification signal, one or more of the spread spectrum modulated signals and one or more of the first spreading codes are inserted to generate a broadcast positioning signal.
  • the insert framing module specifically includes:
  • a receiving unit configured to receive an OFDM signal output by the coded modulation module, a first spreading code sent by the spreading code generating module, and a spread spectrum modulated signal sent by the spread spectrum modulation module;
  • a generating unit configured to: after the preset number of spread spectrum modulated signals are filled between the transmission identification signal of each time slot of the OFDM signal and the first synchronization signal connected to the transmission identification signal, insert the first spreading code, Generate a broadcast positioning signal.
  • the broadcast positioning signal generating apparatus further includes a clock and synchronization module, configured to input a synchronization signal to the code modulation module, or to input a ⁇ atomic clock signal to the code modulation module, or to apply to the code modulation mode
  • the block inputs the timing signal.
  • An embodiment of the present invention further provides an exciter applying the broadcast positioning signal generating apparatus according to any of the above, the exciter comprising: a broadcast positioning signal generating apparatus, further comprising: a digital pre-correcting module, configured to generate a broadcast positioning signal generating apparatus The broadcast positioning signal is pre-corrected. Further, the exciter further includes:
  • the I/Q modulation and up-conversion module is configured to perform I/Q modulation and up-conversion on the pre-corrected broadcast positioning signal output by the digital pre-correction module to generate an analog RF signal;
  • the power amplifier module is configured to perform power amplification on the analog RF signal output by the I/Q modulation and the up-conversion module, and output the RF signal;
  • the filtering module is configured to filter the RF signal output by the power amplifier module.
  • the embodiment of the present invention further provides a transmitter using any of the above exciters, the transmitter comprising: an exciter, further comprising:
  • a transmitting module configured to transmit a pre-corrected broadcast positioning signal of the exciter.
  • the receiving end can accurately capture and track the broadcast positioning signal, and provides a positioning function.
  • the first spreading code that is not modulated is inserted into the OFDM signal, which can isolate the broadcast positioning signal of the next time slot and prevent the signal. Interference.
  • the receiving end receives the broadcast positioning signal of at least three different transmitting ends, and locates the receiving end according to the broadcast positioning signal and the coordinates of three different transmitting ends.
  • FIG. 1 is a flowchart of a method for generating a broadcast positioning signal according to Embodiment 1 of the present invention
  • FIG. 2 is a flowchart of another method for generating a broadcast positioning signal according to Embodiment 2 of the present invention.
  • Embodiment 3 is a flowchart of a positioning method provided in Embodiment 3 of the present invention.
  • FIG. 4 is a schematic structural diagram of a broadcast positioning signal generating apparatus provided in Embodiment 4 of the present invention.
  • FIG. 5 is a schematic structural diagram of another broadcast positioning signal generating apparatus according to Embodiment 5 of the present invention
  • FIG. 6 is a working principle diagram of a spread spectrum modulated signal insertion framing module provided in Embodiment 5 of the present invention
  • FIG. 7 is a schematic structural view of an exciter provided in Embodiment 6 of the present invention.
  • Embodiment 8 is a schematic structural diagram of a transmitter provided in Embodiment 7 of the present invention.
  • FIG. 9 is a block diagram showing the structure of a positioning system provided in Embodiment 8 of the present invention. detailed description
  • CMMB China Mobi le Multimedia Broadcasting
  • DAB Digital Audio Broadcasting
  • an embodiment of the present invention provides a method for generating a broadcast positioning signal, where the method specifically includes:
  • 101 Receive a data stream, perform forward error correction coding and OFDM (Orthogonal Frequency Division Multiplexing) modulation on the data stream, generate an OFDM signal, and generate a first spreading code; 102: according to the first a spreading code performs spread spectrum modulation on the preset teletext bit information to generate a spread spectrum modulated signal; 103: insert one or more words between the transmission identification signal and the first synchronization signal of each time slot of the 0FDM signal The spread spectrum modulated signal, and one or more of the first spreading codes, generate a broadcast positioning signal.
  • OFDM Orthogonal Frequency Division Multiplexing
  • a transmission identification signal TXID Transmitter Identifier
  • two synchronization signals and several OFDM symbols are sequentially included.
  • the first synchronization signal is missing. Synchronization and channel estimation can still be performed by setting the time period or lacking the first synchronization signal. Therefore, the embodiment of the present invention inserts the spread spectrum modulated signal and the first spreading code between the TXID and the first synchronization signal for implementation. Positioning.
  • the method provided by the embodiment of the present invention generates a broadcast by inserting a spread spectrum modulated signal and a first spreading code between a transmission identification signal of each time slot of the OFDM signal and a first synchronization signal connected to the transmission identification symbol.
  • the positioning signal generates a broadcast positioning signal by inserting a spread spectrum modulated signal into the 0FDM signal, so that the receiving end can accurately capture and track the broadcast positioning signal, and provides a positioning function; and inserts the first unmodulated signal into the 0FDM signal.
  • the spreading code can isolate the broadcast positioning signal of the next time slot and prevent interference between signals.
  • an embodiment of the present invention provides a method for generating a broadcast positioning signal, where the method specifically includes: 201: receiving a data stream, performing forward error correction coding and OFDM modulation on the data stream, generating an OFDM signal, and generating a a spreading code;
  • the input data stream is received, forward error correction coding, interleaving, and constellation mapping are performed on the data stream, and the constellation mapped signal is multiplexed with the scattered pilot and the continuous pilot to perform OFDM modulation to generate OFDM. signal.
  • Performing forward error correction coding, interleaving and constellation mapping on the data stream, and performing OFDM modulation on the data stream are existing mature technologies, which are not described in detail in the embodiments of the present invention.
  • the present invention only uses BPSK (Binary Phase Shift Keying). , Binary phase shift keying)
  • the constellation mapping is taken as an example.
  • QPSK Quadrature Phase Shift Keying
  • 16-QAM Quadrature Amplitude Modulation
  • the first spreading code is used for performing spread spectrum modulation to generate a spread spectrum modulated signal, and the first spreading code can also be transmitted with the 0FDM signal at the same time in the whole time, and the receiving end receives the first spreading code. , Fine frequency capture during pseudo-code ranging.
  • the embodiment of the present invention does not limit the manner of generating the first spreading code and the format of the first spreading code, and the first spreading code may be a Gold code.
  • the first spreading code is 511 bits in a cycle.
  • the Gold code is used as an example for description.
  • the first spreading code can also be a Gold code of other cycle digits, such as 1023 bit CDMA (Code Division Multiple Access) spreading code, 127 bit spreading code, etc. .
  • the gain of the first spreading code is less than 20 dB of the 0FDM signal, and is used to ensure that the first spreading code does not interfere with the generated 0FDM signal.
  • the 202 Perform spread spectrum modulation on the preset teletext bit information according to the first spreading code to generate a spread spectrum modulated signal.
  • the BPSK constellation mapping is still taken as an example, by using the received first spreading code and The preset telegram bit information is multiplied to complete the spread spectrum modulation to generate a BPSK spread spectrum modulated signal.
  • the first spreading code is inserted to generate a broadcast. Positioning signal.
  • the transmission identification signal of the OFDM signal and the first synchronization signal connected to the transmission identification signal, the spread spectrum modulation signal and the first spreading code are inserted to generate a broadcast positioning signal, and the inserted spread spectrum is not used in the embodiment of the present invention.
  • the number of modulation signals and the first spreading code and the insertion position are limited, and only at least one expansion is inserted between the transmission identification signal of each time slot of the 0FDM signal and the first synchronization signal connected to the transmission identification signal.
  • a frequency modulated signal and at least one first spreading code Preferably, the preset positioning number of the spread spectrum modulated signals may be first filled, and then one or more first spreading codes are inserted to generate a broadcast positioning signal.
  • the receiving end The broadcast positioning signal can be accurately captured and tracked to realize the positioning function; and the first spreading code without modulation can be inserted at the same time, which can isolate the broadcast positioning signal of the next time slot and prevent interference between signals.
  • the duration of the transmission identification signal TXID is 36 s.
  • the first spreading code is 511-bit Gold code, and the duration of the first spreading code is 33. 8 s ⁇
  • the resulting spread spectrum modulated signal has a duration of 102.2 s.
  • the duration of one frame is 1 second, and the time of one frame has 40 time slots.
  • the spread spectrum modulated signal and the first spreading code are inserted.
  • the spread spectrum modulated signal or the first spreading code may be inserted, and a preset number of spread spectrum modulated signals or a preset number of first spreading codes may be inserted.
  • the first synchronization signal may also be full, which is not limited in the embodiment of the present invention.
  • the first spreading code is cyclically superimposed over a full period of time of the second synchronization signal and the 0FDM signal of each time slot of the generated broadcast positioning signal.
  • the first spreading code is cyclically superimposed in parallel with the broadcast positioning signal, and does not affect the waveform of the broadcast positioning signal, so that the broadcast positioning signal and the first spreading code superimposed by the loop are broadcast together, so that the receiving end Accurate positioning is better achieved when the first spreading code of the cyclic superposition is received.
  • the embodiment of the present invention further includes: further generating a second spreading code, and according to the second spreading code, the second synchronization signal of each time slot of the generated broadcast positioning signal and the full time of the OFDM signal
  • the second spreading code is cyclically superimposed in the segment, and the second spreading code is cyclically superimposed in parallel with the broadcast positioning signal, and does not affect the waveform of the broadcast positioning signal, so that the broadcast positioning signal and the second spreading of the loop are superimposed.
  • the code is broadcast together, so that the receiving end receives the second spreading code superimposed on the loop to better achieve accurate positioning.
  • the method further includes:
  • the analog RF signal is amplified by power, a radio frequency signal is generated, and the RF signal is filtered.
  • the method provided by the embodiment of the present invention generates a broadcast by inserting a spread spectrum modulated signal and a first spreading code between a transmission identification signal of each time slot of the OFDM signal and a first synchronization signal connected to the transmission identification symbol.
  • the positioning signal generates a broadcast positioning signal by inserting a spread spectrum modulated signal into the 0FDM signal, so that the receiving end can accurately capture and track the broadcast positioning signal, and provides a positioning function; and inserts the first unmodulated signal into the 0FDM signal.
  • the spreading code can isolate the broadcast positioning signal of the next time slot and prevent interference between signals.
  • an embodiment of the present invention provides a positioning method for applying a broadcast positioning signal generating method in any of the foregoing embodiments, where the positioning method specifically includes: 301: The sending end generates a broadcast positioning signal, and performs broadcast;
  • the receiving end locates the receiving end according to the received broadcast positioning signal broadcast by at least three different transmitting ends, and the coordinates of the three different transmitting ends.
  • the embodiment of the present invention does not limit the manner in which the receiving end acquires the coordinates of the transmitting end according to the received broadcast positioning signal.
  • the embodiment of the present invention passes three points. Based on the positioning principle, the receiving end is positioned according to the coordinates of three different transmitting ends.
  • the receiving end receives the broadcast positioning signal sent by the sending end, and the distance from the transmitting end to the receiving end is obtained according to the broadcast positioning signal, so that the position of the receiving end is located according to the three-point positioning principle.
  • Example 4
  • an embodiment of the present invention provides a broadcast positioning signal generating apparatus, where the broadcast positioning signal generating apparatus includes a coded modulation module 401, configured to receive a data stream, perform forward error correction coding and OFDM modulation on the data stream, Generating an OFDM signal;
  • the broadcast positioning signal generating apparatus includes a coded modulation module 401, configured to receive a data stream, perform forward error correction coding and OFDM modulation on the data stream, Generating an OFDM signal;
  • the spreading code generating module 402 is configured to generate a first spreading code.
  • a spread spectrum modulation module 403 configured to perform spectral spread modulation on the preset teletext bit information according to the first spreading code to generate a spread spectrum modulated signal
  • the interstitial framing module 404 is configured to receive the OFDM signal generated by the code modulation module 401, the first spreading code generated by the spreading code generating module 402, and the spread spectrum modulated signal generated by the spread spectrum modulation module 403, in each of the OFDM signals. Between the transmission identification signal of the time slot and the first synchronization signal connected to the transmission identification signal, one or more of the spread spectrum modulated signals and one or more of the first spreading codes are inserted to generate a broadcast positioning signal.
  • the broadcast positioning signal generating apparatus provided by the embodiment of the present invention generates a broadcast positioning signal by inserting a spread spectrum modulated signal and a first spreading code in the interpolated framing module, and generates a broadcast positioning by inserting a spread spectrum modulated signal into the 0FDM signal. a signal, so that the receiving end can accurately capture and track the broadcast positioning signal, and provides a positioning function; and inserting a first spreading code without modulation in the 0FDM signal, which can isolate the broadcast positioning signal of the next time slot, Prevent interference between signals.
  • an embodiment of the present invention provides a broadcast positioning signal generating apparatus, where the broadcast positioning signal generating apparatus includes -
  • the single frequency network control module 501 is configured to input a data stream to the code modulation module 502.
  • the coded modulation module 502 is electrically connected to the single frequency network control module 501, and configured to perform forward error correction coding and OFDM modulation on the received data stream to generate an OFDM (Orthogonal Frequency Division Multiplexing) signal;
  • the code modulation module 502 receives the data stream input from the single frequency network control module 501, performs forward error correction coding, interleaving, and constellation mapping on the data stream, and maps the constellation mapped signal with discrete pilot and continuous pilot.
  • the frequency is multiplexed together for 0FDM modulation to generate an OFDM signal.
  • the forward error correction coding, the interleaving and the constellation mapping of the data stream, and the 0FDM modulation of the data stream are existing mature technologies, which are not described in detail in the embodiments of the present invention.
  • the present invention only uses BPSK (Binary Phase). Shift Keying, Binary Phase Shift Keying) is illustrated as an example. In practical applications, QPSK (Quadature Phase Shift Keying) or 16-QAM (Quadature Amplitude Modulation) can be used. Modulation) Constellation mapping.
  • the code modulation module 502 also receives the clock synchronization signal sent by the clock and the synchronization module 506 to implement a clock input of the positioning process.
  • the clock synchronization signal uses a chirped atomic clock frequency and a ku-band timing signal for achieving high-precision synchronization
  • the ku-band timing signal refers to a signal received from a satellite.
  • a spreading code generating module 503, configured to generate a first spreading code
  • the first spreading code is used by the spread spectrum modulation module 504 for spreading modulation to generate a spread spectrum modulated signal, and the first spreading code can also be transmitted with the 0FDM signal at the same time in the whole time, and the receiving end receives the signal.
  • fine frequency acquisition during pseudo code ranging is performed.
  • the embodiment of the present invention does not limit the manner of generating the first spreading code and the format of the first spreading code, and the first spreading code may be a Gold code.
  • the first spreading code is 511 bits in a cycle.
  • the Gold code is taken as an example for description. In practical applications, the first spreading code can also be a Gold code of other cycle digits, such as 1023 bit CDMA (Code Division Multiple Access) spreading code, 127 bit spreading code, etc. .
  • the gain of the first spreading code is less than 20 dB of the 0FDM signal, which is used to ensure that the first spreading code does not interfere with the 0FDM signal output by the coding and modulation module 502.
  • the spread spectrum modulation module 504 is electrically connected to the spread code generation module 503, and is configured to perform spectral spread modulation on the preset teletext bit information according to the first spread code generated by the spread code generation module 503 to generate a spread spectrum modulated signal.
  • the spread spectrum modulation module 504 multiplies the received first spreading code by the preset teletext bit information to complete the spread spectrum modulation, and generates a BPSK spread spectrum modulated signal.
  • the interpolation framing module 505 is electrically connected to the code modulation module 502, the spreading code generation module 503, and the spread spectrum modulation module 504, and is configured to receive the OFDM signal output by the code modulation module 502 and the first extension sent by the spread code generation module 503. Frequency a spread spectrum modulated signal transmitted by the code and spread spectrum modulation module 504, between the transmission identification signal of each time slot of the OFDM signal and the first synchronization signal connected to the transmission identification signal, one or more of the spread spectrum modulation is inserted A signal, and one or more of the first spreading codes, generate a broadcast positioning signal.
  • a transmission identification signal TXID for each time slot of the OFDM signal, a transmission identification signal TXID, two synchronization signals, and several OFDM symbols are sequentially included.
  • the preset time period of the first synchronization signal is missing or the first is lacking.
  • the synchronization signal can still perform synchronization and channel estimation. Therefore, in the embodiment of the present invention, the spread spectrum modulation signal and the first spreading code are inserted between the TXID and the first synchronization signal for realizing positioning.
  • the interstitial framing module 505 of the embodiment of the present invention specifically includes:
  • a receiving unit configured to receive an OFDM signal generated by the coded modulation module 502, a first spreading code generated by the spreading code generating module 503, and a spread spectrum modulated signal generated by the spread spectrum modulation module 504;
  • a generating unit configured to: after the preset number of spread spectrum modulated signals are filled between the transmission identification signal of each time slot of the OFDM signal and the first synchronization signal connected to the transmission identification signal, insert the first spreading code, Generate a broadcast positioning signal.
  • the transmission identification signal of the OFDM signal and the first synchronization signal connected to the transmission identification signal, the spread spectrum modulation signal and the first spreading code are inserted to generate a broadcast positioning signal, and the inserted spread spectrum is not used in the embodiment of the present invention.
  • the number of modulation signals and the first spreading code and the insertion position are limited, and only at least one expansion is inserted between the transmission identification signal of each time slot of the 0FDM signal and the first synchronization signal connected to the transmission identification signal.
  • a frequency modulated signal and at least one first spreading code may be inserted after the preset number of spread spectrum modulated signals are first filled.
  • the receiving end can accurately capture and track the broadcast positioning signal to implement the positioning function; and simultaneously insert the first spreading code without modulation, and can broadcast the positioning signal to the next time slot. It acts as an isolation to prevent interference between signals.
  • the length of the transmission identification signal TXID is 36 s.
  • the first spreading code is a 511-bit Gold code, and the duration of the first spreading code is used as an example. 2 s ⁇
  • the length of the generated spread spectrum modulated signal is 102.2 s.
  • the duration of one frame is 1 second, and the time of one frame has 40 time slots.
  • the spread spectrum modulated signal and the first spreading code are inserted in the TXID segment and the first 100 s of the first synchronization signal.
  • the spread spectrum modulated signal or the first spreading code may be inserted in the remaining time period of the first synchronization signal, and a preset number of spread spectrum modulated signals or a preset number of first spreading codes may be inserted.
  • the first synchronization signal may also be full, which is not limited in the embodiment of the present invention.
  • the interstitial framing module 505 further includes a first spreading code generated by the spreading code generating module 503, and a second synchronization signal and an OFDM signal for each time slot of the generated broadcast positioning signal.
  • the first spreading code is cyclically superimposed, and the first spreading code is cyclically superimposed in parallel with the broadcast positioning signal, and does not affect the waveform of the broadcast positioning signal, so that the broadcast positioning signal and the first spreading code superimposed by the loop are And broadcast out, so that the receiving end receives the loop Precise positioning is better achieved when the first spreading code is superimposed.
  • the spreading code generating module 503 in the embodiment of the present invention is further configured to generate a second spreading code
  • the interstitial framing module 505 is further configured to: according to the second spreading code generated by the spreading code generating module 503, the second synchronization signal of each time slot of the generated broadcast positioning signal and the full time of the OFDM signal
  • the second spreading code is cyclically superimposed in the segment, and the second spreading code is cyclically superimposed in parallel with the broadcast positioning signal, and does not affect the waveform of the broadcast positioning signal, so that the broadcast positioning signal and the second spreading of the loop are superimposed.
  • the code is broadcast together, so that the receiving end receives the second spreading code superimposed on the loop to better achieve accurate positioning.
  • the broadcast positioning signal generating apparatus further includes a clock and synchronization module 506 for inputting a synchronization signal to the code modulation module 502, or for inputting a cesium atomic clock signal to the code modulation module 502, or for inputting to the code modulation module 502. Timing signal.
  • the synchronization signal may adopt a high-precision time scale of an atomic clock or/and a national timing center, and the high-precision time scale of the national timing center is obtained from the satellite, and the clock and synchronization module 506 is implemented in the broadcast positioning signal generating device. Precise insertion of broadcast signal framing and CDMA positioning signals.
  • the synchronization signal input by the clock and the synchronization module 506 adopts a cesium atomic clock, which can realize accurate time synchronization of the positioning signal insertion; the synchronization signal input by the clock and the synchronization module 506 adopts a high-precision time scale of the national timing center as a timing signal. It is capable of outputting a broadcast positioning signal that is superior to the high-precision positioning requirement of 10 ns.
  • the broadcast positioning signal generating apparatus further includes an insertion control module 507 electrically connected to the interstitial framing module 505 for controlling the interstitial framing module 505 to ensure strict time synchronization of the broadcast positioning signal broadcast.
  • the broadcast positioning signal generating apparatus further includes a power module, and the code modulation module 502, the spreading code generating module 503, the spread spectrum modulation module 504, the interstitial framing module 505, the clock and synchronization module 506, and the insertion control module 507. Connection, used to power the broadcast positioning signal generating device.
  • the broadcast positioning signal generating apparatus provided by the embodiment of the present invention can be applied to the method for generating the broadcast positioning signal, and the broadcast positioning signal is generated by inserting the spread spectrum modulated signal and the first spreading code in the interpolated framing module, because the broadcast positioning is performed.
  • a spread spectrum modulated signal is inserted into the signal generating device, so that the receiving end can accurately capture and track the broadcast positioning signal, and provides a positioning function; and simultaneously inserting the first spreading code without modulation in the broadcast positioning signal generating device,
  • the spread code inserted later acts as an isolation to prevent interference between signals.
  • an embodiment of the present invention provides an exciter, which includes the broadcast positioning signal generating apparatus 601 in any of the above embodiments, and further includes:
  • the digital pre-correction module 602 is configured to pre-calibrate the broadcast positioning signal generated by the broadcast positioning signal generating device 601. Positive.
  • the output signal has a high peak-to-average ratio.
  • the signal modulation, frequency conversion, and power amplification units have limited dynamic range. Will cause nonlinear distortion. Therefore, the digital pre-correction module 602 is arranged in the exciter, and the pre-distortion processing of the received broadcast positioning signal is performed to cancel the nonlinear distortion caused by the amplified portion, and the nonlinear amplitude distortion and phase distortion generated by the back-end RF power amplifier are compensated. , thus effectively improving the linearity of the RF power amplifier.
  • the exciter further includes an I/Q (In-phase/Quadrature) modulation and up-conversion module 603, a power amplifier module 604, and a filtering module 605.
  • I/Q In-phase/Quadrature modulation and up-conversion module
  • power amplifier module 604 the exciter further includes an I/Q (In-phase/Quadrature) modulation and up-conversion module 603, a power amplifier module 604, and a filtering module 605.
  • the I/Q modulation and up-conversion module 603 is configured to implement I/Q modulation and up-conversion of the pre-corrected broadcast positioning signal output by the digital pre-correction module 602 to generate an analog RF signal; specifically, digital pre-correction
  • the post broadcast positioning signal is digital-analog transformed and directly modulated onto the intermediate frequency.
  • the intermediate frequency signal is upconverted by the surface acoustic wave filter to generate an analog RF signal of the desired channel.
  • the power amplifier module 604 is configured to perform power amplification on the analog RF signal generated by the I/Q modulation and the up-conversion module 603, and output a radio frequency signal.
  • the embodiment of the present invention uses a voltage-controlled e-attenuator to adjust power.
  • the power amplifier module 604 is an intelligent universal module, and the controller only needs to adjust the register through the I 2 C to adjust the register to achieve the purpose of power adjustment.
  • the power amplifier module 604 adopts ALC (Automatic Level Control) automatic power level control of the fast loop and the slow loop when outputting the radio frequency signal, thereby greatly improving the stability of the output power.
  • ALC Automatic Level Control
  • the filtering module 605 is configured to filter the RF signal output by the power amplifier module 604 and output the filtered RF signal.
  • the filtering module 605 can be a low-pass filter or a band-pass filter, and mainly filters high-order harmonics in the radio frequency signal.
  • the exciter further includes a remote control module 606 electrically connected to the code modulation module in the broadcast positioning signal generating device 601 for controlling the working state of the exciter; specifically, the remote control module 606 mainly controls the input exciter The data stream, the processing of the signal in the exciter, and the analog signal output.
  • the interface mode of the remote control module 606 includes an RS-232 interface and an Ethernet interface that can be connected to the Internet.
  • the exciter further includes a power module, and is electrically connected to the broadcast positioning signal generating device 601, the digital pre-correcting module 602, the I/Q modulation and up-conversion module 603, the power amplifier module 604, and the filtering module 605 of the exciter, and is used for Power the exciter.
  • the idle period IPDL (I dl e Period Downl ink) can be used.
  • the base stations are divided into three groups: 1, 2, 3 groups, the exciter used by each group of base stations alternately suspends the transmission of the broadcast positioning signal, and the receiving end receives the exciter to transmit the signal to the receiving end during the period of time. Detect broadcast positioning signals transmitted by other base stations to avoid strong and weak interference.
  • the exciter provided by the embodiment of the invention can be applied to the method for generating the broadcast positioning signal, generates a broadcast positioning signal by using the broadcast positioning signal generating device, and performs pre-correction, I/Q modulation, up-conversion, power amplifier and the broadcast positioning signal.
  • the filtering process realizes the precise positioning function of the exciter, and provides precise positioning information and navigation information to the mobile terminal under the CMMB/DAB mobile broadcasting system.
  • the receiving end is a mobile terminal, the mobile terminal realizes the mobile while demodulating the mobile multimedia broadcasting. Terminal positioning and navigation functions.
  • the high-precision broadcast positioning signal in the embodiment of the present invention is compatible with the original broadcast system, does not affect the mobile terminal receiving function of the mobile terminal in the original system, and can provide real-time high-precision broadcast positioning signals for the mobile terminal, and provides high-precision time better than 10 ns. Synchronous positioning enables wide-area high-precision positioning and navigation of a wide range of mobile terminals.
  • an embodiment of the present invention provides a transmitter, where the transmitter includes the exciter 701 in any of the foregoing embodiments, and further includes:
  • the sending module 702 is configured to send the pre-corrected broadcast positioning signal of the exciter 701.
  • the transmitter provided by the embodiment of the present invention can be applied to the method for generating a broadcast positioning signal, and provides accurate positioning information and navigation information to a mobile terminal under the CMMB/DAB mobile broadcast system by transmitting a pre-corrected broadcast positioning signal, and moving The terminal realizes the positioning and navigation functions of the mobile terminal while demodulating the mobile multimedia broadcast.
  • the high-precision broadcast positioning signal in the embodiment of the present invention is compatible with the original broadcast system, does not affect the receiving function of the mobile terminal in the original system, and can provide real-time high-precision broadcast positioning signals for the mobile terminal, and provides high-precision time synchronization better than 10 ns. Positioning, realizing wide-area high-precision positioning and navigation of mobile terminals.
  • an embodiment of the present invention provides a positioning system, where the positioning system includes a plurality of transmitting ends 801 and one or more receiving ends 802;
  • the sending end 801 is configured to prestore the coordinates of the sending end, and generate a broadcast positioning signal for broadcasting;
  • the receiving end 802 is configured to receive broadcast positioning signals broadcast by at least three different transmitting ends 801, and coordinates of the three transmitting ends, and locate the receiving end according to the three-point positioning principle.
  • the transmitting end 801 may be the broadcast positioning signal generating device capable of generating the broadcast positioning signal described in any one of the fourth embodiment to the seventh embodiment, or an exciter capable of generating the broadcast positioning signal, or capable of generating the broadcast positioning signal.
  • the transmitter 802 can be a transmitter or a mobile phone.
  • the receiver 802 can be a mobile terminal or a mobile phone.
  • the sender 801 and the receiver 802 are not limited in this embodiment of the present invention.
  • the positioning system provided by the embodiment of the present invention receives the broadcast positioning signal broadcasted by at least three transmitting ends and the coordinates of the three transmitting ends by the receiving end, so as to locate the position of the receiving end according to the three-point positioning principle.
  • the broadcast positioning signal generating device, the exciter and the transmitter provided by the foregoing embodiments are only illustrated by the division of the above functional modules. In practical applications, the functions may be assigned differently according to requirements.
  • the function module is completed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.
  • the method for generating the broadcast positioning signal provided by the foregoing embodiment is the same as the device embodiment of the broadcast positioning signal generating device. For details, refer to the device embodiment, and details are not described herein.

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Description

广播定位信号信号生成方法及装置、 定位方法及装置
本申请要求于 2010年 10月 18 日提交中国专利局、 申请号为 201010517356. 4， 发明名 称为 "广播定位信号生成方法、 定位方法及装置" 的中国专利申请的优先权， 其全部内容 通过引用结合在本申请中。 技术领域
本发明涉及移动广播电视技术领域， 特别涉及一种广播定位信号生成方法、 定位方法 及装置。 背景技术
近年来， 人们对室内外精确定位的需求与日俱增， 特别是在应对紧急情况时， 准确定 位更是显得尤为重要。 现有技术中定位技术主要包括： GPS (Global Positioning System, 全球定位系统） 定位、 移动终端基站定位等。
在实现本发明的过程中， 发明人发现现有技术中至少存在以下问题：
采用 GPS定位的方式需要与卫星进行通讯， 因此现有的 GPS定位终端成本比较高。 采用移动终端基站定位的方式需要与基站进行通讯， 因此需要移动终端具有定位功能， 而当前的大量移动终端并不具有定位功能。 因此无论在现有移动终端中进行升级或更换新 的移动终端都会造成成本的增加。 同时如果大量移动终端都与基站通讯进行定位则会占用 通讯资源。 发明内容
为了精确定位并解决现有技术中的 GPS 定位方式和移动终端基站定位方式成本高且占 用通讯资源的问题， 本发明实施例提供了一种广播定位信号生成方法、 定位方法、 广播定 位信号生成装置、 激励器和发射机。 所述技术方案如下：
本发明实施例提出了一种广播定位信号生成方法， 所述方法包括：
接收数据流， 对所述数据流进行前向纠错编码和正交频分复用 OFDM调制， 生成 0FDM 信号， 并生成第一扩频码；
根据所述第一扩频码对预设的电文比特信息进行扩频调制， 生成扩频调制信号； 在所述 0FDM信号的每个时隙的传输标识信号和第一个同步信号之间， 插入一个或一个 以上所述扩频调制信号， 以及一个或一个以上所述第一扩频码， 生成广播定位信号。
具体地， 所述在所述 OFDM信号的每个时隙的传输标识信号和连接该传输标识信号的第 一个同步信号之间， 插入一个或一个以上所述扩频调制信号， 以及一个或一个以上所述第 一扩频码， 具体为- 在 OFDM信号的每个时隙的传输标识信号和连接该传输标识信号的第一个同步信号之间 填充预设个数个扩频调制信号之后， 插入第一扩频码。
进一步地， 所述方法之后还包括：
对所述广播定位信号进行预校正和数模转换， 得到模拟射频信号；
对所述模拟射频信号进行功率放大， 生成射频信号， 并对所述射频信号进行滤波。 本发明实施例还提出了一种应用如上述广播定位信号生成方法的定位方法， 所述定位 方法包括：
发送端生成广播定位信号， 并进行广播；
接收端根据接收到的至少三个不同的发送端广播的所述广播定位信号， 以及所述三个 不同发送端的坐标对接收端进行定位。
本发明实施例还提出了一种广播定位信号生成装置， 所述广播定位信号生成装置包括: 编码调制模块，用于接收数据流，对所述数据流进行前向纠错编码和正交频分复用 OFDM 调制， 生成 OFDM信号；
扩频码生成模块， 用于生成第一扩频码；
扩频调制模块， 用于根据所述第一扩频码对预设的电文比特信息进行扩频调制， 生成 扩频调制信号；
插播成帧模块， 用于接收编码调制模块输出的 OFDM信号、 扩频码生成模块发送的第一 扩频码和扩频调制模块发送的扩频调制信号， 在 OFDM信号的每个时隙的传输标识信号和连 接该传输标识信号的第一个同步信号之间， 插入一个或一个以上所述扩频调制信号， 以及 一个或一个以上所述第一扩频码， 生成广播定位信号。
具体地， 所述插播成帧模块具体包括：
接收单元， 用于接收编码调制模块输出的 OFDM信号、 扩频码生成模块发送的第一扩频 码和扩频调制模块发送的扩频调制信号；
生成单元， 用于在 OFDM信号的每个时隙的传输标识信号和连接该传输标识信号的第一 个同步信号之间填充预设个数个扩频调制信号之后， 插入第一扩频码， 生成广播定位信号。
进一步地， 所述广播定位信号生成装置还包括时钟与同步模块， 用于向编码调制模块 输入同步信号， 或用于向所述编码调制模块输入铷原子钟信号， 或用于向所述编码调制模 块输入授时信号。
本发明实施例还提出了应用如上述任一广播定位信号生成装置的激励器， 所述激励器 包括： 广播定位信号生成装置， 还包括- 数字预校正模块， 用于对广播定位信号生成装置生成的广播定位信号进行预校正。 进一步地， 所述激励器还包括：
I/Q 调制及上变频模块， 用于对数字预校正模块输出的预校正后的广播定位信号进行 I/Q调制及上变频， 生成模拟射频信号；
功放模块， 用于对 I/Q调制及上变频模块输出的模拟射频信号进行功率放大， 输出射 频信号；
滤波模块， 用于对功放模块输出的射频信号进行滤波。
本发明实施例还提出了一种应用如上述任一激励器的发射机， 所述发射机包括： 激励 器， 还包括：
发射模块， 用于发射激励器预校正后的广播定位信号。
本发明实施例提供的技术方案带来的有益效果是：
通过在 OFDM信号的每个时隙的传输标识信号和第一个同步信号之间插入扩频调制信号 和第一扩频码， 生成广播定位信号， 由于在 OFDM信号中插入了扩频调制信号， 从而接收端 能够准确捕获并跟踪该广播定位信号， 提供了定位功能； 同时在 OFDM信号中插入没有经过 调制的第一扩频码， 能够对下一时隙的广播定位信号起到隔离作用， 防止信号间的干扰。 另外， 通过接收端接收到至少三个不同的发送端的广播定位信号， 并根据该广播定位信号 以及三个不同发送端的坐标对接收端进行定位。 附图说明
为了更清楚地说明本发明实施例中的技术方案， 下面将对实施例描述中所需要使用的 附图作简单地介绍， 显而易见地， 下面描述中的附图仅仅是本发明的一些实施例， 对于本 领域普通技术人员来讲， 在不付出创造性劳动的前提下， 还可以根据这些附图获得其他的 附图。
图 1是本发明实施例 1中提供的广播定位信号生成方法的流程图；
图 2是本发明实施例 2中提供的另一广播定位信号生成方法的流程图；
图 3是本发明实施例 3中提供的定位方法的流程图；
图 4是本发明实施例 4中提供的广播定位信号生成装置的结构示意图；
图 5是本发明实施例 5中提供的另一广播定位信号生成装置的结构示意图； 图 6是本发明实施例 5中提供的扩频调制信号插播成帧模块的工作原理图；
图 7是本发明实施例 6中提供的激励器的结构示意图；
图 8是本发明实施例 7中提供的发射机的结构示意图；
图 9是本发明实施例 8中提供的定位系统的结构示意图。 具体实施方式
为使本发明的目的、 技术方案和优点更加清楚， 下面将结合附图对本发明实施方式作 进一步地详细描述。
目前， 各地各级电视台早已构成了遍布全国的广电网络， CMMB ( China Mobi le Multimedia Broadcasting, 中国移云力多媒体广播） /DAB (Digital Audio Broadcasting, 数 字音频广播） 的激励器通过广播式信道， 为手机电视用户随时随地提供电视、 广播、 紧急 广播、 网页浏览、 天气预报、 股票行情和政务信息等普及型服务。 因此， 本发明的设计思 路是利用普遍存在的广电网络进行定位， 以节省有限的无线通信资源， 并降低成本。
实施例 1
参见图 1， 本发明实施例提供了一种广播定位信号生成方法， 该方法具体包括：
101： 接收数据流， 对该数据流进行前向纠错编码和 OFDM ( Orthogonal Frequency Division Multiplexing, 正交频分复用） 调制， 生成 OFDM信号， 并生成第一扩频码； 102： 根据该第一扩频码对预设的电文比特信息进行扩频调制， 生成扩频调制信号； 103： 在 0FDM信号的每个时隙的传输标识信号和第一个同步信号之间， 插入一个或一 个以上该扩频调制信号， 以及一个或一个以上该第一扩频码， 生成广播定位信号。
其中， 对于 0FDM 信号的每个时隙， 依序包括一个传输标识信号 TXID ( Transmitter Identifier, 发射机标识）、 两个同步信号和若干个 0FDM符号， 实际应用中， 缺少第一个 同步信号的预设时间段或缺少第一个同步信号， 仍可以进行同步与信道估计， 因此， 本发 明实施例在 TXID和第一个同步信号之间插播扩频调制信号和第一扩频码， 用于实现定位。
本发明实施例提供的方法， 通过在 0FDM信号的每个时隙的传输标识信号和连接该传输 标识符号的第一个同步信号之间， 插入扩频调制信号和第一扩频码， 生成广播定位信号， 由于在 0FDM信号中插入了扩频调制信号， 生成广播定位信号， 从而接收端能够准确捕获并 跟踪该广播定位信号， 提供了定位功能； 同时在 0FDM信号中插入没有经过调制的第一扩频 码， 能够对下一时隙的广播定位信号起到隔离作用， 防止信号间的干扰。 实施例 2 参见图 2， 本发明实施例提供了一种广播定位信号生成方法， 该方法具体包括： 201： 接收数据流， 对该数据流进行前向纠错编码和 OFDM调制， 生成 OFDM信号， 并生 成第一扩频码；
具体地， 接收输入的数据流， 对该数据流进行前向纠错编码、 交织和星座映射， 并将 星座映射后的信号与离散导频与连续导频复接在一起进行 OFDM调制， 生成 OFDM信号。
对数据流进行前向纠错编码、 交织和星座映射， 及对数据流进行 OFDM调制是现有较成 熟的技术，本发明实施例不对其做详细说明，本发明仅以 BPSK (Binary Phase Shift Keying, 二相相移键控） 星座映射为例进行说明， 实际应用中， 可以采用 QPSK (Quadrature Phase Shift Keying, 四相相移键控） 或 16-QAM (Quadrature Amplitude Modulation, 正交振幅 调制） 星座映射。
其中，第一扩频码用于进行扩频调制，生成扩频调制信号，该第一扩频码还可以与 0FDM 信号在全时间内同频发送， 接收端接收到该第一扩频码时， 进行伪码测距时的精频捕获。
本发明实施例不对生成第一扩频码的方式及第一扩频码的格式进行限定， 该第一扩频 码可以为 Gold码， 本发明实施例以第一扩频码为周期 511位的 Gold码为例进行说明， 实 际应用中， 第一扩频码也可以为其他周期位数的 Gold码， 如 1023bit CDMA (Code Division Multiple Access, 码分多址） 扩频码、 127bit扩频码等。
优选地， 该第一扩频码发送的增益低于 0FDM信号 20dB， 用于保证该第一扩频码不对上 述生成的 0FDM信号产生干扰。
202： 根据该第一扩频码对预设的电文比特信息进行扩频调制， 生成扩频调制信号； 具体地， 仍以 BPSK星座映射为例进行说明， 通过将接收的第一扩频码与预设的电文比 特信息相乘， 完成扩频调制， 生成 BPSK扩频调制信号。
203： 在 0FDM信号的每个时隙的传输标识信号和第一个同步信号之间， 插入一个或一 个以上该扩频调制信号， 以及一个或一个以上该第一扩频码， 生成广播定位信号。
具体地， 在 0FDM信号的每个时隙的传输标识信号和连接该传输标识信号的第一个同步 信号之间填充预设个数个扩频调制信号之后， 插入第一扩频码， 生成广播定位信号。
本发明实施例在 0FDM信号的传输标识信号和连接该传输标识信号的第一个同步信号， 插播扩频调制信号和第一扩频码， 生成广播定位信号， 本发明实施例不对插入的扩频调制 信号和第一扩频码的个数及插入位置进行限定， 仅保证在 0FDM信号的每个时隙的传输标识 信号和连接该传输标识信号的第一个同步信号之间， 插入至少一个扩频调制信号和至少一 个第一扩频码。 优选地， 可以先填充预设个数个扩频调制信号之后， 再插入一个或一个以 上第一扩频码， 生成广播定位信号。 由于在 0FDM信号中插入了扩频调制信号， 从而接收端 能够准确捕获并跟踪该广播定位信号， 实现定位功能； 同时插入没有经过调制的第一扩频 码， 能够对下一时隙的广播定位信号起到隔离作用， 防止信号间的干扰。
对于 OFDM信号中的每个时隙， 传输标识信号 TXID的时长为 36 s， 本发明实施例仍以 上述第一扩频码为 511位 Gold码为例， 该第一扩频码的时长为 33. 8 μ s， 生成的扩频调制 信号的时长为 102. 2 s。 如图 6所示， 1帧的时长为 1秒， 1帧有 40个时隙， 在 TXID段与 第一个同步信号的前 lOO s内， 插播扩频调制信号和第一扩频码， 优选地， 在第一个同步 信号剩余的时间段内还可以插播扩频调制信号或第一扩频码， 可以插入预设个数个扩频调 制信号或预设个数个第一扩频码， 也可以将该第一同步信号插满， 本发明实施例不对此进 行限定。
204： 对生成的广播定位信号的每个时隙的第二个同步信号和 0FDM信号的全时间段内 循环叠加该第一扩频码。
其中， 该第一扩频码是与广播定位信号并行循环叠加， 并不影响广播定位信号的波形， 从而将该广播定位信号和该循环叠加的第一扩频码一并广播出去， 使得接收端接收到循环 叠加的第一扩频码时， 更好地实现精确定位。
优选地， 本发明实施例还包括： 还生成第二扩频码， 并根据该第二扩频码， 对生成的 广播定位信号的每个时隙的第二个同步信号和 0FDM信号的全时间段内循环叠加该第二扩频 码， 该第二扩频码是与广播定位信号并行循环叠加， 并不影响广播定位信号的波形， 从而 将该广播定位信号和该循环叠加的第二扩频码一并广播出去， 使得接收端接收到该循环叠 加的第二扩频码时， 更好地实现精确定位。
进一步地， 该方法之后还包括：
对广播定位信号进行预校正和数模转换， 得到模拟射频信号；
对模拟射频信号进行功率放大， 生成射频信号， 并对该射频信号进行滤波。
本发明实施例提供的方法， 通过在 0FDM信号的每个时隙的传输标识信号和连接该传输 标识符号的第一个同步信号之间， 插入扩频调制信号和第一扩频码， 生成广播定位信号， 由于在 0FDM信号中插入了扩频调制信号， 生成广播定位信号， 从而接收端能够准确捕获并 跟踪该广播定位信号， 提供了定位功能； 同时在 0FDM信号中插入没有经过调制的第一扩频 码， 能够对下一时隙的广播定位信号起到隔离作用， 防止信号间的干扰。 实施例 3
参见图 3，本发明实施例提供了一种应用上述任一实施例中的广播定位信号生成方法的 定位方法， 该定位方法具体包括： 301： 发送端生成广播定位信号， 并进行广播；
302： 接收端根据接收到的至少三个不同的发送端广播的该广播定位信号， 以及该三个 不同发送端的坐标对接收端进行定位。
其中， 本发明实施例不对接收端根据接收到广播定位信号获取发送端的坐标的方式进 行限定， 其具体步骤可以参考中国专利申请公开号为 CN 101616482A 中公开的技术内容， 本发明实施例通过三点定位原理， 根据三个不同发送端的坐标对接收端进行定位。
本发明实施例提供的定位方法， 通过接收端接收到发送端发送的广播定位信号， 可以 根据该广播定位信号获取发送端到接收端的距离， 从而根据三点定位原理， 定位出接收端 的位置。 实施例 4
参见图 4， 本发明实施例提供一种广播定位信号生成装置， 该广播定位信号生成装置包 括- 编码调制模块 401， 用于接收数据流， 对该数据流进行前向纠错编码和 OFDM调制， 生 成 OFDM信号；
扩频码生成模块 402， 用于生成第一扩频码；
扩频调制模块 403， 用于根据该第一扩频码对预设的电文比特信息进行扩频调制， 生成 扩频调制信号；
插播成帧模块 404，用于接收编码调制模块 401生成的 OFDM信号、扩频码生成模块 402 生成的第一扩频码和扩频调制模块 403生成的扩频调制信号， 在 OFDM信号的每个时隙的传 输标识信号和连接该传输标识信号的第一个同步信号之间， 插入一个或一个以上该扩频调 制信号， 以及一个或一个以上该第一扩频码， 生成广播定位信号。
本发明实施例提供的广播定位信号生成装置， 通过在插播成帧模块插入扩频调制信号 和第一扩频码， 生成广播定位信号， 由于在 0FDM信号中插入了扩频调制信号， 生成广播定 位信号， 从而接收端能够准确捕获并跟踪该广播定位信号， 提供了定位功能； 同时在 0FDM 信号中插入没有经过调制的第一扩频码， 能够对下一时隙的广播定位信号起到隔离作用， 防止信号间的干扰。 实施例 5
参见图 5， 本发明实施例提供一种广播定位信号生成装置， 该广播定位信号生成装置包 括- 单频网控制模块 501， 用于向编码调制模块 502输入数据流；
编码调制模块 502， 与单频网控制模块 501电连接， 用于对接收的数据流进行前向纠错 编码和 OFDM调制， 生成 OFDM ( Orthogonal Frequency Division Multiplexing, 正交频分 复用技术） 信号；
具体地， 编码调制模块 502接收来自单频网控制模块 501输入的数据流， 对该数据流 进行前向纠错编码、 交织和星座映射， 并将星座映射后的信号与离散导频和连续导频复接 在一起进行 0FDM调制， 生成 0FDM信号。
其中， 对数据流进行前向纠错编码、 交织和星座映射， 及对数据流进行 0FDM调制是现 有较成熟的技术， 本发明实施例不对其做详细说明， 本发明仅以 BPSK (Binary Phase Shift Keying, 二相相移键控）星座映射为例进行说明， 实际应用中， 可以采用 QPSK ( Quadrature Phase Shift Keying, 四相相移键控） 或 16-QAM ( Quadrature Ampl itude Modulation, 正 交振幅调制） 星座映射。
进一步地， 编码调制模块 502还接收时钟与同步模块 506发送的时钟同步信号， 实现 定位过程的时钟输入。 优选地， 该时钟同步信号采用铷原子钟频及 ku波段授时信号， 用于 实现高精度同步， 该 ku波段授时信号指从卫星上接收的信号。
扩频码生成模块 503， 用于生成第一扩频码；
其中， 第一扩频码用于供扩频调制模块 504进行扩频调制， 生成扩频调制信号， 该第 一扩频码还可以与 0FDM信号在全时间内同频发送， 接收端接收到该第一扩频码时， 进行伪 码测距时的精频捕获。
本发明实施例不对生成第一扩频码的方式及第一扩频码的格式进行限定， 该第一扩频 码可以为 Gold码， 本发明实施例以第一扩频码为周期 511位的 Gold码为例进行说明， 实 际应用中， 第一扩频码也可以为其他周期位数的 Gold码， 如 1023bit CDMA ( Code Division Multiple Access , 码分多址） 扩频码、 127bit扩频码等。
优选地， 该第一扩频码发送的增益低于 0FDM信号 20dB， 用于保证该第一扩频码不对编 码调制模块 502输出的 0FDM信号产生干扰。
扩频调制模块 504， 与扩频码生成模块 503电连接， 用于根据扩频码生成模块 503生成 的第一扩频码对预设的电文比特信息进行扩频调制， 生成扩频调制信号；
具体地， 仍以 BPSK星座映射为例进行说明， 扩频调制模块 504将接收的第一扩频码与 预设的电文比特信息相乘， 完成扩频调制， 生成 BPSK扩频调制信号。
插播成帧模块 505， 与编码调制模块 502、 扩频码生成模块 503和扩频调制模块 504电 连接， 用于接收编码调制模块 502输出的 0FDM信号、 扩频码生成模块 503发送的第一扩频 码和扩频调制模块 504发送的扩频调制信号， 在 OFDM信号的每个时隙的传输标识信号和连 接该传输标识信号的第一个同步信号之间， 插入一个或一个以上该扩频调制信号， 以及一 个或一个以上该第一扩频码， 生成广播定位信号。
具体地， 对于 OFDM信号的每个时隙， 依序包括一个传输标识信号 TXID、 两个同步信号 和若干个 OFDM符号， 实际应用中， 缺少第一个同步信号的预设时间段或缺少第一个同步信 号， 仍可以进行同步与信道估计， 因此， 本发明实施例在 TXID和第一个同步信号之间插入 扩频调制信号和第一扩频码， 用于实现定位。
优选地， 本发明实施例的插播成帧模块 505具体包括：
接收单元， 用于接收编码调制模块 502生成的 OFDM信号、 扩频码生成模块 503生成的 第一扩频码和扩频调制模块 504生成的扩频调制信号；
生成单元， 用于在 0FDM信号的每个时隙的传输标识信号和连接该传输标识信号的第一 个同步信号之间填充预设个数个扩频调制信号之后， 插入第一扩频码， 生成广播定位信号。
本发明实施例在 0FDM信号的传输标识信号和连接该传输标识信号的第一个同步信号， 插播扩频调制信号和第一扩频码， 生成广播定位信号， 本发明实施例不对插入的扩频调制 信号和第一扩频码的个数及插入位置进行限定， 仅保证在 0FDM信号的每个时隙的传输标识 信号和连接该传输标识信号的第一个同步信号之间， 插入至少一个扩频调制信号和至少一 个第一扩频码。 优选地， 可以先填充预设个数个扩频调制信号之后， 再插入一个或一个以 上第一扩频码。 由于在 0FDM信号中插入了扩频调制信号， 从而接收端能够准确捕获并跟踪 该广播定位信号， 实现定位功能； 同时插入没有经过调制的第一扩频码， 能够对下一时隙 的广播定位信号起到隔离作用， 防止信号间的干扰。
对于 0FDM信号中的每个时隙， 传输标识信号 TXID的时长为 36 s， 本发明实施例仍以 上述第一扩频码为周期 511位的 Gold码为例， 该第一扩频码的时长为 33. 8 s， 生成的扩 频调制信号的时长为 102. 2 s。如图 6所示， 1帧的时长为 1秒， 1帧有 40个时隙，在 TXID 段与第一个同步信号的前 lOO s内， 插播扩频调制信号和第一扩频码。 优选地， 在第一个 同步信号剩余的时间段内还可以插播扩频调制信号或第一扩频码， 可以插入预设个数个扩 频调制信号或预设个数个第一扩频码， 也可以将该第一同步信号插满， 本发明实施例不对 此进行限定。
进一步地， 插播成帧模块 505还包括根据扩频码生成模块 503生成的第一扩频码， 对 生成的广播定位信号的每个时隙的第二个同步信号和 0FDM信号的全时间段内循环叠加该第 一扩频码， 该第一扩频码是与广播定位信号并行循环叠加， 并不影响广播定位信号的波形， 从而将该广播定位信号和该循环叠加的第一扩频码一并广播出去， 使得接收端接收到循环 叠加的第一扩频码时， 更好地实现精确定位。
优选地， 本发明实施例中的扩频码生成模块 503， 还用于生成第二扩频码；
相应地， 插播成帧模块 505， 还用于根据扩频码生成模块 503生成的第二扩频码， 对生 成的广播定位信号的每个时隙的第二个同步信号和 OFDM信号的全时间段内循环叠加该第二 扩频码， 该第二扩频码是与广播定位信号并行循环叠加， 并不影响广播定位信号的波形， 从而将该广播定位信号和该循环叠加的第二扩频码一并广播出去， 使得接收端接收到该循 环叠加的第二扩频码时， 更好地实现精确定位。
进一步地， 该广播定位信号生成装置还包括时钟与同步模块 506， 用于向编码调制模块 502输入同步信号， 或用于向编码调制模块 502输入铷原子钟信号， 或用于向编码调制模块 502输入授时信号。
具体地， 该同步信号可采用原子钟或 /和国家授时中心的高精度时标， 该国家授时中心 的高精度时标从卫星获得， 通过在广播定位信号生成装置中设置时钟与同步模块 506， 实现 广播信号组帧及 CDMA定位信号的精确插播。 优选地， 该时钟与同步模块 506输入的同步信 号采用铷原子钟， 能够实现定位信号插播的精确时间同步； 该时钟与同步模块 506 输入的 同步信号采用国家授时中心的高精度时标作为授时信号， 能够输出优于 10ns的高精度定位 要求的广播定位信号。
进一步地， 该广播定位信号生成装置还包括插播控制模块 507， 与插播成帧模块 505电 连接， 用于对插播成帧模块 505进行控制， 以保证广播定位信号播发的严格时间同步。
进一步地， 该广播定位信号生成装置还包括电源模块， 与编码调制模块 502、 扩频码生 成模块 503、 扩频调制模块 504、 插播成帧模块 505、 时钟与同步模块 506及插播控制模块 507电连接， 用于为广播定位信号生成装置供电。
本发明实施例提供的广播定位信号生成装置， 能够应用于上述广播定位信号的生成方 法， 通过在插播成帧模块插入扩频调制信号和第一扩频码， 生成广播定位信号， 由于在广 播定位信号生成装置中插入了扩频调制信号， 从而接收端能够准确捕获并跟踪该广播定位 信号， 提供了定位功能； 同时在广播定位信号生成装置中插入没有经过调制的第一扩频码， 能够对其后插入的扩频码起到隔离作用， 防止信号间的干扰。 实施例 6
参见图 7， 本发明实施例提供了一种激励器， 该激励器包括上述任一实施例中的广播定 位信号生成装置 601， 还包括：
数字预校正模块 602，用于对广播定位信号生成装置 601生成的广播定位信号进行预校 正。
具体地， 由于在广播定位信号生成装置 601中采用了 OFDM多载波调制技术， 输出信号 具有很高的峰均比， 在实际的电路实现中， 信号调制、 变频以及功率放大等单元由于动态 范围有限， 将导致非线性失真。 因此在激励器中设置数字预校正模块 602， 通过对接收的广 播定位信号进行预失真处理， 抵消由于放大部分所造成的非线性失真， 补偿后端的射频功 放所产生的非线性幅度失真和相位失真， 从而有效改善射频功放的线性度。 经过非线性校 正， 能够在相同的输出信号质量指标下， 输出更大的功率或者使用更小的功率放大器可获 得所需要的输出功率， 有效改善输出信号的质量。 同时， 将提高功率放大器的电源使用效 率， 降低电源功耗， 减少散热， 提高可靠性。
进一步地， 该激励器还包括 I/Q ( In-phase/Quadrature , 同向正交） 调制及上变频模 块 603、 功放模块 604和滤波模块 605。
其中， I/Q调制及上变频模块 603， 用于对数字预校正模块 602输出的预校正后的广播 定位信号实现 I/Q调制及上变频， 生成模拟射频信号； 具体地， 经过数字预校正后的广播 定位信号经数模变换， 并直接调制到中频上， 中频信号经声表面波滤波器后进行上变频， 生成所需频道的模拟射频信号。
功放模块 604， 用于对 I/Q调制及上变频模块 603生成的模拟射频信号进行功率放大， 输出射频信号； 具体地， 本发明实施例采用压控的电调衰减器对功率进行调整， 该功放模 块 604为一个智能通用模块， 控制器只需要通过 I 2C 调整寄存器就可以起到功率调整的目 的。优选地， 该功放模块 604在输出射频信号时， 采用快环、 慢环的 ALC ( Automat i c Leve l Control , 自动电平控制） 自动功率电平控制， 极大地提高输出功率的稳定性。
滤波模块 605，用于对功放模块 604输出的射频信号进行滤波，输出滤波后的射频信号。 其中， 该滤波模块 605可以为低通滤波器， 也可以为带通滤波器， 主要对射频信号中的高 次谐波进行滤波。
进一步地， 该激励器还包括遥控控制模块 606， 与广播定位信号生成装置 601中的编码 调制模块电连接， 用于控制激励器的工作状态； 具体地， 该遥控控制模块 606 主要控制输 入激励器的数据流、 激励器中信号的处理过程及输出的模拟信号。 遥控控制模块 606 的接 口模式包括 RS-232接口， 及可以与互联网相接的以太网接口。
进一步地， 该激励器还包括电源模块， 与激励器的广播定位信号生成装置 601、 数字预 校正模块 602、 I/Q调制及上变频模块 603、 功放模块 604和滤波模块 605电连接， 用于为 激励器供电。
实际应用中， 可采用空闲周期 IPDL ( I dl e Period Downl ink , 空闲周期下行链路） 方 式， 根据网络拓扑把基站分为三组： 1、 2、 3组， 通过每组基站所用激励器轮流暂停对广播 定位信号的发射， 接收端接收激励器发射信号的接收端在该段时间内检测其他基站发射的 广播定位信号， 避免强弱干扰。
本发明实施例提供的激励器， 能够应用于上述广播定位信号的生成方法， 通过广播定 位信号生成装置生成广播定位信号， 并对广播定位信号进行预校正、 I/Q调制及上变频、 功 放和滤波处理， 实现激励器的精确定位功能， 向 CMMB/DAB移动广播体制下的移动终端提供 精确定位信息和导航信息， 接收端为移动终端时， 移动终端在解调移动多媒体广播的同时， 实现移动终端的定位及导航功能。 本发明实施例中的高精度广播定位信号兼容原有广播体 制， 不影响原体制下移动终端移动广播接收功能， 能够为移动终端提供实时高精度广播定 位信号， 并提供优于 10ns的高精度时间同步定位， 实现广大移动终端的广域高精度定位与 导航。 实施例 7
参见图 8， 本发明实施例提供了一种发射机， 该发射机包括上述任一实施例中的激励器 701 , 还包括：
发送模块 702， 用于发送激励器 701预校正后的广播定位信号。
本发明实施例提供的发射机， 能够应用于上述广播定位信号的生成方法， 通过发送预 校正后的广播定位信号， 向 CMMB/DAB移动广播体制下的移动终端提供精确定位信息和导航 信息， 移动终端在解调移动多媒体广播的同时， 实现移动终端的定位及导航功能。 本发明 实施例中的高精度广播定位信号兼容原有广播体制， 不影响原体制下移动终端的接收功能， 能够为移动终端提供实时高精度广播定位信号， 并提供优于 10ns的高精度时间同步定位， 实现移动终端的广域高精度定位与导航。 实施例 8
参见图 9， 本发明实施例提供了一种定位系统， 该定位系统包括多个发送端 801和一个 或一个以上接收端 802;
发送端 801， 用于预存发送端的坐标， 并生成广播定位信号， 进行广播；
接收端 802， 用于接收至少三个不同发送端 801广播的广播定位信号， 以及该三个发送 端的坐标， 根据三点定位原理对接收端进行定位。
其中， 发送端 801可以为上述实施例 4至实施例 7中任一实施例记载的能够生成上述 广播定位信号的广播定位信号生成装置， 或能够生成上述广播定位信号的激励器， 或能够 生成上述广播定位信号的发射机； 接收端 802可以为移动终端或手机等， 本发明实施例对 发送端 801和接收端 802不做限定。
本发明实施例提供的定位系统， 通过接收端接收到至少三个发送端广播的广播定位信 号和该三个发送端的坐标， 从而根据三点定位原理， 定位出接收端的位置。
需要说明的是： 上述实施例提供的对广播定位信号生成装置、 激励器和发射机， 仅以 上述各功能模块的划分进行举例说明， 实际应用中， 可以根据需要而将上述功能分配由不 同的功能模块完成， 即将装置的内部结构划分成不同的功能模块， 以完成以上描述的全部 或者部分功能。 另外， 上述实施例提供的广播定位信号生成方法与广播定位信号生成装置 的装置实施例属于同一构思， 其具体实现过程详见装置实施例， 这里不再赘述。
本领域普通技术人员可以理解上述实施例方法中的全部或部分处理是可以通过程 序来指令相关的硬件完成， 所述的程序可以存储于一种计算机可读取的存储介质中， 存 储介质例如： 计算机中的硬盘、 光盘或软盘。
以上所述仅为本发明的优选实施例， 并不用以限制本发明， 凡在本发明的精神和原则 之内， 所作的任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。

Claims

权 利 要 求 书
1、 一种广播定位信号生成方法， 其特征在于， 所述方法包括：
接收数据流， 对所述数据流进行前向纠错编码和正交频分复用 OFDM调制， 生成 OFDM信 号， 并生成第一扩频码；
根据所述第一扩频码对预设的电文比特信息进行扩频调制， 生成扩频调制信号； 在所述 OFDM信号的每个时隙的传输标识信号和第一个同步信号之间，插入一个或一个以 上所述扩频调制信号， 以及一个或一个以上所述第一扩频码， 生成广播定位信号。
2、 如权利要求 1所述的方法， 其特征在于， 所述在所述 OFDM信号的每个时隙的传输标 识信号和连接该传输标识信号的第一个同步信号之间， 插入一个或一个以上所述扩频调制信 号， 以及一个或一个以上所述第一扩频码， 具体为：
在 OFDM 信号的每个时隙的传输标识信号和连接该传输标识信号的第一个同步信号之间 填充预设个数个扩频调制信号之后， 插入第一扩频码。
3、 如权利要求 1所述的方法， 其特征在于， 所述方法之后还包括：
对所述广播定位信号进行预校正和数模转换， 得到模拟射频信号；
对所述模拟射频信号进行功率放大， 生成射频信号， 并对所述射频信号进行滤波。
4、一种应用如权利要求 1-3任一项所述的广播定位信号生成方法的定位方法， 其特征在 于， 所述定位方法包括：
发送端生成广播定位信号， 并进行广播；
接收端根据接收到的至少三个不同的发送端广播的所述广播定位信号， 以及所述三个不 同发送端的坐标对接收端进行定位。
5、 一种广播定位信号生成装置， 其特征在于， 所述广播定位信号生成装置包括： 编码调制模块， 用于接收数据流， 对所述数据流进行前向纠错编码和正交频分复用 0FDM 调制， 生成 0FDM信号；
扩频码生成模块， 用于生成第一扩频码；
扩频调制模块， 用于根据所述第一扩频码对预设的电文比特信息进行扩频调制， 生成扩 频调制信号； 插播成帧模块， 用于接收编码调制模块输出的 OFDM信号、扩频码生成模块发送的第一扩 频码和扩频调制模块发送的扩频调制信号，在 OFDM信号的每个时隙的传输标识信号和连接该 传输标识信号的第一个同步信号之间， 插入一个或一个以上所述扩频调制信号， 以及一个或 一个以上所述第一扩频码， 生成广播定位信号。
6、 如权利要求 5所述的广播定位信号生成装置， 其特征在于， 所述插播成帧模块具体包 括- 接收单元， 用于接收编码调制模块输出的 OFDM信号、扩频码生成模块发送的第一扩频码 和扩频调制模块发送的扩频调制信号；
生成单元，用于在 OFDM信号的每个时隙的传输标识信号和连接该传输标识信号的第一个 同步信号之间填充预设个数个扩频调制信号之后， 插入第一扩频码， 生成广播定位信号。
7、 如权利要求 5或 6所述的广播定位信号生成装置， 其特征在于， 所述广播定位信号生 成装置还包括时钟与同步模块， 用于向编码调制模块输入同步信号， 或用于向所述编码调制 模块输入铷原子钟信号， 或用于向所述编码调制模块输入授时信号。
8、一种应用如权利要求 5-7任一项所述的广播定位信号生成装置的激励器，其特征在于， 所述激励器包括：
广播定位信号生成装置， 还包括- 数字预校正模块， 用于对广播定位信号生成装置生成的广播定位信号进行预校正。
9、 如权利要求 8所述的激励器， 其特征在于， 所述激励器还包括：
I/Q调制及上变频模块，用于对数字预校正模块输出的预校正后的广播定位信号进行 I/Q 调制及上变频， 生成模拟射频信号；
功放模块， 用于对 I/Q调制及上变频模块输出的模拟射频信号进行功率放大， 输出射频 信号；
滤波模块， 用于对功放模块输出的射频信号进行滤波。
10、 一种应用如权利要求 8或 9所述的激励器的发射机， 其特征在于， 所述发射机包括: 激励器， 还包括：
发射模块， 用于发射激励器预校正后的广播定位信号。
PCT/CN2011/075458 2010-10-18 2011-06-08 广播定位信号信号生成方法及装置、定位方法及装置 Ceased WO2012051860A1 (zh)

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