Simultaneous transmit receive communication and ranging integrated processing system and method

Abstract

The application relates to a simultaneous same-frequency full-duplex communication and ranging integrated processing system and method, which comprises a transmitting link baseband signal processing module, a radio frequency transmitting channel, a radio frequency receiving channel, a real-time zero value measurement module and a self-interference suppression module. The transmitting link baseband signal processing module processes communication signals and ranging signals. The radio frequency transmitting channel processes a local transmitting signal through DAC and up-conversion, and then processes the high-frequency transmitting signal to an antenna. The radio frequency receiving channel processes a receiving signal through DAC and down-conversion after the receiving signal is processed to an intermediate frequency, and outputs a digital baseband receiving signal. The real-time zero value measurement module measures a channel delay to calculate a system zero value. The self-interference suppression module performs self-interference channel estimation and self-interference signal reconstruction to suppress self-interference. The receiving link baseband communication signal processing module recovers communication data information. The receiving link baseband ranging signal processing module outputs a ranging service signal. The application has the ability of simultaneously transmitting and receiving ranging signals and communication signals at the same frequency, improves frequency spectrum utilization, and reduces ranging error.

Description

Technical Field

[0001] This invention relates to the field of communications, and more particularly to an integrated system and method for simultaneous full-duplex communication and ranging at the same frequency. Background Technology

[0002] Currently, both wireless communication and ranging systems employ time-division duplex (TDM) or frequency-division duplex (FDM) half-duplex modes, transmitting and receiving signals orthogonally in either the frequency or time dimension to ensure no interference between transmission and reception. However, this results in wasted spectrum resources and a loss of ranging accuracy. Specifically, in TDM mode, the communication and ranging signals are superimposed and transmitted uplink and downlink in time slots, allowing only unidirectional communication and ranging within a single time slot. In FDM mode, the communication and ranging signals are superimposed and transmitted uplink and downlink at frequency points, allowing only unidirectional communication and ranging at a single frequency point. This leads to insufficient spectrum utilization in communication services and issues in ranging services such as asymmetry in ranging loops caused by time slot or frequency deviations, resulting in system errors, insufficient accumulation time, and inability to perform real-time zero-value measurements, ultimately affecting the system's service capabilities.

[0003] In wireless networks with communication transmission and precise ranging functions, existing half-duplex communication and ranging systems can no longer meet the increasing demands of communication services and ranging accuracy requirements. Therefore, in addition to improving spectrum utilization by simultaneously transmitting uplink and downlink communication signals on the same time slot and frequency, it is necessary to achieve real-time bidirectional ranging at the same frequency, avoid the problem of asymmetric ranging loops between time slots or frequencies, further reduce system measurement errors through real-time zero-value calibration, and improve the signal-to-noise ratio of ranging signals through long-term accumulation to achieve the effect of improving ranging accuracy. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a simultaneous, same-frequency, full-duplex communication and ranging integrated processing system and method, thus solving the deficiencies of the prior art.

[0005] The objective of this invention is achieved through the following technical solution: a simultaneous, same-frequency, full-duplex communication and ranging integrated processing system, the system comprising: a transmit link baseband signal processing module, an RF transmit channel, an RF receive channel, a real-time zero-value measurement module, a self-interference suppression module, a receive link baseband communication signal processing module, and a receive link baseband ranging signal processing module;

[0006] The transmit link baseband signal processing module is configured to perform communication signal processing and ranging signal processing.

[0007] The radio frequency transmission channel is configured to perform digital-to-analog conversion and up-conversion processing on the local transmission signal, and then process the radio frequency transmission signal to a high frequency to output a high-frequency transmission signal to the antenna.

[0008] The radio frequency receiving channel is configured to process the received signal to intermediate frequency and perform analog-to-digital conversion before down-conversion to output a digital baseband received signal.

[0009] The real-time zero-value measurement module is configured to use strong self-interference signals in the received signal to perform channel delay measurement in order to calculate the system zero value.

[0010] The self-interference suppression module is configured to perform self-interference channel estimation on the digital baseband received signal, and then perform self-interference suppression through self-interference signal reconstruction.

[0011] The receiving link baseband communication signal processing module is configured to recover communication data information;

[0012] The receiving link baseband ranging signal processing module is configured to achieve precise synchronization of pseudocode phase and carrier, correct dynamic errors in real time, calculate the distance between the transceiver based on the tracking results, and output ranging service signals.

[0013] The communication signal processing includes: encoding, modulation, spreading, and inserting synchronization codes into data frames; the ranging signal processing includes: generating ranging pseudocode; the communication signal and the ranging signal are superimposed to form the transmitted digital baseband signal.

[0014] The real-time zero-value measurement module specifically includes: multiplying the down-converted digital baseband received signal by the lead code and hysteresis code generated by the pseudo-code generator, respectively, passing them through an integrator to suppress noise, and then passing them through a code ring phase detector and a smoothing filter to control the delay of the pseudo-code generator, so that the local pseudo-code phase is aligned with the input signal, thereby achieving code phase locking to obtain the system transmit and receive channel delay, and finally subtracting the fixed air interface delay to obtain the system zero value.

[0015] The self-interference suppression module specifically includes: updating the filter coefficient vector recursively to estimate the self-interference channel by updating the gain vector and iterating the parameter estimation vector; reconstructing the self-interference by multiplying the filter coefficients by the input signal; and finally subtracting the reconstructed signal from the received signal to obtain the self-interference suppressed signal.

[0016] The receiving link baseband ranging signal processing module specifically includes: firstly, capturing the digital baseband received signal, initially aligning the phase of the digital baseband received signal with the local ranging pseudocode, determining the signal presence and initial time delay, then tracking based on the capture, achieving precise synchronization of the pseudocode phase and carrier, correcting dynamic errors, and finally calculating the distance between the transmitting and receiving ends based on the results, and outputting the ranging service signal.

[0017] A processing method based on a simultaneous, same-frequency, full-duplex communication and ranging integrated processing system, the processing method comprising:

[0018] S1. The communication service input signal is encoded, modulated, spread, and has a synchronization code inserted by the baseband signal processing module of the transmission link. It is then added to the local ranging pseudo-code to form the local transmission signal and sent to the radio frequency transmission channel.

[0019] S2. In the radio frequency transmission channel, the transmitted signal is first converted from a digital signal to an analog signal by a DAC, and then up-converted by multiplying it with the local oscillation signal. After up-conversion, the signal is processed by radio frequency transmission signal processing to output the corresponding high-frequency transmission signal to the antenna.

[0020] S3. The antenna receives high-frequency signals, which are first processed by radio frequency signal processing, and then multiplied by the local oscillation signal for down-conversion to baseband. The baseband received signal obtained by down-conversion is converted from analog signal to digital signal by ADC to obtain digital baseband received signal and sent to self-interference suppression module and real-time zero value measurement module.

[0021] S4. The real-time zero-value measurement module adopts a simultaneous and same-frequency full-duplex communication system. It uses a delay-locked loop to obtain the self-loop delay of the transmit and receive channels, and uses this delay for zero-value calibration.

[0022] S5. In the self-interference suppression module, the self-interference channel is estimated for the digital baseband received signal, the self-interference signal is reconstructed using the estimated channel, the self-interference signal is then subtracted from the reconstructed self-interference signal from the digital baseband received signal to cancel the self-interference, and then the canceled signal is sent to the receiving link baseband signal processing module.

[0023] S6. The receiving link baseband signal processing module is divided into two parts: receiving link baseband communication signal processing and receiving link baseband ranging signal processing. The receiving link baseband communication signal processing includes carrier synchronization and time synchronization of the digital baseband received signal, followed by despreading, demodulation, frame synchronization and decoding operations to output the communication service signal. The receiving link baseband ranging signal processing includes acquisition, tracking and ranging calculation of the carrier-synchronized digital baseband received signal, and finally outputting the ranging service signal.

[0024] The steps of S4 specifically include: the down-converted digital baseband received signal is multiplied by the lead code and hysteresis code generated by the pseudo code generator, respectively, and then the noise is suppressed by the integrator and zeroer. The delay of the pseudo code generator is controlled by the code ring phase detector and the smoothing filter to make the local pseudo code phase aligned with the input signal, thereby achieving code phase locking to obtain the system transmit and receive channel delay. Finally, the fixed air interface delay is subtracted to obtain the system zero value.

[0025] This invention offers the following advantages: a simultaneous, same-frequency, full-duplex communication and ranging integrated processing system and method enables simultaneous uplink and downlink transmission of communication signals at the same time slot and frequency, thereby improving spectrum utilization. Furthermore, it achieves real-time bidirectional ranging at the same frequency, avoiding asymmetric loops in ranging between time slots or frequencies. Real-time zero-value calibration further reduces system measurement errors, and long-term accumulation improves the signal-to-noise ratio of the ranging signal, thus enhancing ranging accuracy. It possesses the ability to simultaneously transmit and receive ranging and communication signals at the same frequency, improving spectrum utilization and reducing ranging errors. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the system structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the real-time zero-value measurement module;

[0028] Figure 3 This is a schematic diagram of the self-interference suppression module. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of this application provided below with reference to the accompanying drawings is not intended to limit the scope of protection of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The present invention will be further described below with reference to the accompanying drawings.

[0030] like Figure 1As shown, one embodiment of the present invention relates to a simultaneous full-duplex communication and ranging integrated processing system, which includes a transmit link baseband signal processing module, an RF transmit channel, an RF receive channel, a real-time zero-value measurement module, a self-interference suppression module, a receive link baseband communication signal processing module, and a receive link baseband ranging signal processing module.

[0031] The transmit link baseband signal processing module is divided into two parts: communication signal processing and ranging signal processing. Communication signal processing includes operations such as encoding, modulation, spreading, and inserting synchronization codes into data frames. Ranging signal processing mainly includes the generation of ranging pseudocode. The two signals are superimposed to form the transmit digital baseband signal.

[0032] In the radio frequency (RF) transmission channel, the local transmission signal is up-converted by a digital-to-analog converter (DAC), and then processed to a high frequency by the RF transmission signal to output the corresponding high-frequency transmission signal and send it to the antenna.

[0033] The radio frequency (RF) receiving channel performs RF reception processing on the received signal, including processing the RF received signal to intermediate frequency (IF), downconverting it to baseband after passing through an analog-to-digital converter (ADC), and outputting the corresponding digital baseband received signal.

[0034] The real-time zero-value measurement module uses strong self-interference signals in the received signal to measure channel delay in order to calculate the system zero value.

[0035] The self-interference suppression module estimates the self-interference channel of the digital baseband received signal and then suppresses the self-interference by reconstructing the self-interference signal.

[0036] The receiving link baseband communication signal processing module includes operations such as carrier synchronization, time synchronization, despreading, demodulation, and decoding to recover the corresponding communication data information.

[0037] The receiving link baseband ranging signal processing module first captures the digital baseband received signal, preliminarily aligns the phase of the digital baseband received signal with the local ranging pseudocode, determines the signal presence and coarse time delay, and then tracks based on the capture to achieve precise synchronization of the pseudocode phase and carrier, corrects dynamic errors in real time, and finally calculates the distance between the transmitting and receiving ends based on the tracking results, and outputs the ranging service signal.

[0038] Furthermore, the real-time zero-value measurement module obtains the system transmit / receive channel delay through a DLL (Delay Locked Loop) loop via full-duplex zero-value calibration. This delay can be used for real-time zero-value calibration. The DLL loop structure diagram is shown below. Figure 2As shown, the down-converted digital baseband received signal is multiplied by a lead code and a lag code of a certain phase generated by the pseudo-code generator. These are then processed by an integrator to suppress noise, and a code loop phase detector and a smoothing filter to control the delay of the pseudo-code generator. This aligns the local pseudo-code phase with the input signal, achieving code phase locking to obtain the system transmit / receive channel delay. Subtracting the fixed air interface delay yields the system zero value. This zero-value calibration method, compared to the traditional half-duplex system, can dynamically track changes in the system zero value in real time, reducing system zero-value calibration errors and improving ranging accuracy.

[0039] Furthermore, the self-interference suppression module adopts an "estimation + reconstruction + cancellation" structure. The following example uses Recursive Least Squares (RLS) as an example of the self-interference suppression algorithm. Figure 3 This is a block diagram of the RLS self-interference suppression structure. Through gain vector updates and parameter estimation vector iterations, the filter coefficient vector is updated recursively to estimate the self-interference channel. The self-interference is reconstructed by multiplying the filter coefficients by the input signal. Finally, the self-interference-suppressed signal is obtained by subtracting the reconstructed signal from the received signal. Self-interference suppression is a prerequisite for real-time simultaneous transmission and reception of signals at the same frequency. The effective operation of the self-interference suppression module ensures the normal operation of the simultaneous full-duplex system at the same frequency, thereby improving the spectrum utilization efficiency of communication services, enhancing ranging accuracy, and bringing performance improvements compared to half-duplex systems.

[0040] Another embodiment of the present invention relates to a method for simultaneous, same-frequency, full-duplex communication and ranging integration, specifically including the following steps:

[0041] S1: The communication service input signal is processed by the baseband signal of the transmission link to obtain the local transmission signal, which is then sent to the radio frequency transmission channel. In the baseband signal processing module of the transmission link, the communication service input signal is encoded, modulated, spread, and a synchronization code is inserted. Then, it is added to the local ranging pseudocode to form the local transmission signal.

[0042] S2: In the radio frequency transmission channel, the local transmission signal first passes through the DAC to be converted from a digital signal to an analog signal, and then is up-converted by multiplying with the local oscillation signal. After up-conversion, the signal is processed by the radio frequency transmission signal to output the corresponding high-frequency transmission signal and sent to the antenna.

[0043] S3: The antenna receives high-frequency signals, which are first processed by radio frequency signal processing, and then multiplied by the local oscillation signal for down-conversion to baseband. The baseband received signal obtained by down-conversion is converted from analog signal to digital signal by ADC to obtain digital baseband received signal and sent to self-interference suppression module and real-time zero value measurement module.

[0044] S4: The real-time zero-value measurement module adopts a simultaneous, same-frequency, full-duplex communication system, which can complete zero-value measurement in real time. The full-duplex zero-value calibration uses a delay-locked loop (DLL) to obtain the self-loop delay of the transmit and receive channels, and zero-value calibration can be performed using this delay.

[0045] S5: In the self-interference suppression module, self-interference channel estimation is performed on the digital baseband received signal, self-interference signal reconstruction is performed using the estimated channel, self-interference cancellation is performed by subtracting the reconstructed self-interference signal from the digital baseband received signal, and then the canceled signal is sent to the receiving link baseband signal processing module.

[0046] S6: The receiving link baseband signal processing module is divided into two parts: receiving link baseband communication signal processing and receiving link baseband ranging signal processing. The receiving link baseband communication signal processing includes carrier synchronization and time synchronization of the digital baseband received signal, followed by despreading, demodulation, frame synchronization, decoding and other operations to output the communication service signal. The receiving link baseband ranging signal processing includes acquisition, tracking and ranging calculation of the carrier-synchronized digital baseband received signal, and finally outputting the ranging service signal.

[0047] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and improvements, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A simultaneous, same-frequency, full-duplex communication and ranging integrated processing system, characterized in that: The system includes: a transmit link baseband signal processing module, an RF transmit channel, an RF receive channel, a real-time zero-value measurement module, a self-interference suppression module, a receive link baseband communication signal processing module, and a receive link baseband ranging signal processing module. The transmit link baseband signal processing module is configured to perform communication signal processing and ranging signal processing. The radio frequency transmission channel is configured to perform digital-to-analog conversion and up-conversion processing on the local transmission signal, and then process the radio frequency transmission signal to a high frequency to output a high-frequency transmission signal to the antenna. The radio frequency receiving channel is configured to process the received signal to intermediate frequency and perform analog-to-digital conversion before down-conversion to output a digital baseband received signal. The real-time zero-value measurement module is configured to use strong self-interference signals in the received signal to perform channel delay measurement in order to calculate the system zero value. The self-interference suppression module is configured to perform self-interference channel estimation on the digital baseband received signal, and then perform self-interference suppression through self-interference signal reconstruction. The receiving link baseband communication signal processing module is configured to recover communication data information; The receiving link baseband ranging signal processing module is configured to achieve precise synchronization of pseudocode phase and carrier, correct dynamic errors in real time, calculate the distance between the transceiver based on the tracking results, and output ranging service signals. The real-time zero-value measurement module specifically includes: multiplying the down-converted digital baseband received signal by the lead code and hysteresis code generated by the pseudo-code generator, respectively, passing them through an integrator to suppress noise, and then passing them through a code ring phase detector and a smoothing filter to control the delay of the pseudo-code generator, so that the local pseudo-code phase is aligned with the input signal, thereby achieving code phase locking to obtain the system transmit and receive channel delay, and finally subtracting the fixed air interface delay to obtain the system zero value.

2. The integrated processing system for simultaneous full-duplex communication and ranging according to claim 1, characterized in that: The communication signal processing includes: encoding, modulation, spreading, and inserting synchronization codes into data frames; the ranging signal processing includes: generating ranging pseudocode; the communication signal and the ranging signal are superimposed to form the transmitted digital baseband signal.

3. The integrated processing system for simultaneous full-duplex communication and ranging according to claim 1, characterized in that: The self-interference suppression module specifically includes: updating the filter coefficient vector recursively to estimate the self-interference channel by updating the gain vector and iterating the parameter estimation vector; reconstructing the self-interference by multiplying the filter coefficients by the input signal; and finally subtracting the reconstructed signal from the received signal to obtain the self-interference suppressed signal.

4. The integrated processing system for simultaneous full-duplex communication and ranging according to claim 1, characterized in that: The receiving link baseband ranging signal processing module specifically includes: firstly, capturing the digital baseband received signal, initially aligning the phase of the digital baseband received signal with the local ranging pseudocode, determining the signal presence and initial time delay, then tracking based on the capture, achieving precise synchronization of the pseudocode phase and carrier, correcting dynamic errors, and finally calculating the distance between the transmitting and receiving ends based on the results, and outputting the ranging service signal.

5. A processing method based on the system according to any one of claims 1-4, characterized in that: The processing method includes: S1. The communication service input signal is encoded, modulated, spread, and has a synchronization code inserted by the baseband signal processing module of the transmission link. It is then added to the local ranging pseudo-code to form the local transmission signal and sent to the radio frequency transmission channel. S2. In the radio frequency transmission channel, the transmitted signal is first converted from a digital signal to an analog signal by a DAC, and then up-converted by multiplying it with the local oscillation signal. After up-conversion, the signal is processed by radio frequency transmission signal processing to output the corresponding high-frequency transmission signal to the antenna. S3. The antenna receives high-frequency signals, which are first processed by radio frequency signal processing, and then multiplied by the local oscillation signal for down-conversion to baseband. The baseband received signal obtained by down-conversion is converted from analog signal to digital signal by ADC to obtain digital baseband received signal and sent to self-interference suppression module and real-time zero value measurement module. S4. The real-time zero-value measurement module adopts a simultaneous and same-frequency full-duplex communication system. It uses a delay-locked loop to obtain the self-loop delay of the transmit and receive channels, and uses this delay for zero-value calibration. S5. In the self-interference suppression module, the self-interference channel is estimated for the digital baseband received signal, the self-interference signal is reconstructed using the estimated channel, the self-interference signal is then subtracted from the reconstructed self-interference signal from the digital baseband received signal to cancel the self-interference, and then the canceled signal is sent to the receiving link baseband signal processing module. S6. The receiving link baseband signal processing module is divided into two parts: receiving link baseband communication signal processing and receiving link baseband ranging signal processing. The receiving link baseband communication signal processing includes carrier synchronization and time synchronization of the digital baseband received signal, followed by despreading, demodulation, frame synchronization and decoding operations to output the communication service signal. The receiving link baseband ranging signal processing includes acquisition, tracking and ranging calculation of the carrier-synchronized digital baseband received signal, and finally outputting the ranging service signal.

6. The processing method according to claim 5, characterized in that: The steps of S4 specifically include: the down-converted digital baseband received signal is multiplied by the lead code and hysteresis code generated by the pseudo code generator, respectively, and then the noise is suppressed by the integrator and zeroer. The delay of the pseudo code generator is controlled by the code ring phase detector and the smoothing filter to make the local pseudo code phase aligned with the input signal, thereby achieving code phase locking to obtain the system transmit and receive channel delay. Finally, the fixed air interface delay is subtracted to obtain the system zero value.

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