CN116192321A - Communication perception integrated system and waveform design method - Google Patents

Communication perception integrated system and waveform design method Download PDF

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Publication number
CN116192321A
CN116192321A CN202211553853.9A CN202211553853A CN116192321A CN 116192321 A CN116192321 A CN 116192321A CN 202211553853 A CN202211553853 A CN 202211553853A CN 116192321 A CN116192321 A CN 116192321A
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signal
communication
signals
perception
sensing
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刘志强
吴旭
夏海洋
刘欢
李连鸣
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Southeast University
Network Communication and Security Zijinshan Laboratory
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Southeast University
Network Communication and Security Zijinshan Laboratory
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
    • G01S7/414—Discriminating targets with respect to background clutter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J4/00—Combined time-division and frequency-division multiplex systems
    • 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
    • H04L25/03006—Arrangements for removing intersymbol interference
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Noise Elimination (AREA)

Abstract

The invention discloses a communication perception integrated system and a waveform design method, wherein the system comprises the following components: the system comprises a digital signal processing module, a transmitting link, a receiving link, a local oscillator, a transmitting antenna and a receiving antenna; the system and the waveform are cooperatively designed to realize a communication and perception signal waveform time-frequency multiplexing working mode, so that the traditional communication and perception signals can be fully utilized to realize high-performance communication and perception at the same time, and the real-time performance and the frequency spectrum utilization rate of the perception and communication are obviously improved; by utilizing the proposed phase relativity of the communication perception integrated synthesized waveform and combining a system scheme, the cancellation of the phase noise of the perception signal is realized, the influence of the phase noise, the Doppler effect and the carrier frequency offset on the communication signal is eliminated, the performance indexes of the perception and communication baseband signals are obviously improved, and the signal processing difficulty is reduced.

Description

Communication perception integrated system and waveform design method
Technical Field
The invention belongs to the field of mobile communication and radar sensing, and particularly relates to a communication sensing integrated system and a waveform design method.
Background
With the explosive growth of communication data rate, the demand for spectrum resources is larger and larger, the low-frequency band spectrum resources are very tense, and the research of millimeter wave or even terahertz frequency band technology is promoted. At present, millimeter wave and terahertz frequency bands are mainly applied to radar sensing systems and used for achieving functions of target detection sensing, positioning, tracking and the like. Compared with a communication system, the radar sensing system has great similarity in system architecture, and is composed of a transmitter, a receiver, an antenna, a digital signal processing module and the like. Therefore, the communication perception integrated research is carried out, so that hardware resource sharing can be realized, the system utilization rate is improved, the complexity of the whole system is reduced, miniaturization, universalization and multifunctionalization of equipment are realized, and communication is carried out by utilizing some excellent performances of the radar perception system, such as high transmitting power, high receiving sensitivity, strong directivity of an antenna and the like, so that the performance of the communication system is improved. In the existing communication perception integrated technology, one scheme adopts a mode of time-sharing work of radar perception and communication functions, the two functions have no mutual interference, but the defects are that the frequency spectrum utilization rate is low, and the contradiction between the radar perception and the communication time distribution is difficult to solve; the other scheme is to adopt complex waveform design to realize communication perception integration function, and can realize radar perception and communication simultaneously, but the waveform design is complex, the digital signal processing difficulty is big, the time delay is big, and it is difficult to consider communication and perception performance simultaneously. Along with the development of the working frequency of the radar and communication system to the millimeter wave, terahertz and other high-frequency bands, the influence of system phase noise is more obvious, the signal to noise ratio of a receiver is severely limited, and meanwhile, the Doppler effect and the communication carrier frequency offset can cause serious interference among communication signals and intersymbol interference to limit the communication rate.
Disclosure of Invention
Technical problems: in order to overcome the problems in the prior art, the invention provides a communication and perception integrated system and a waveform design method, the system simultaneously transmits and receives communication and radar perception signals, adopts a time-frequency multiplexing working mode, ensures the communication and perception performances, and simultaneously remarkably improves the frequency spectrum utilization rate and reduces the signal processing difficulty; communication and perceived signal phase noise cancellation are realized, and the influence of Doppler effect and carrier frequency offset on communication performance is eliminated.
The technical scheme is as follows: the invention relates to a communication and perception integrated system and a waveform design method, the system and the waveform are cooperatively designed, the system transmits signals as a general sense integrated composite signal comprising communication and perception signals, the communication and perception signals adopt a time-frequency multiplexing working mode, namely the communication and perception signals are different in frequency at the same time and different in the same frequency, the communication signals and the perception signals use the same frequency band in the working process of the system, and the frequency of the communication and perception signals in the frequency band changes according to the design rule along with time, so that the frequency spectrum resource is fully utilized as much as possible.
The sensing signal waveform comprises a frequency modulation continuous wave FMCW signal and a pulse modulation signal, and the communication signal waveform comprises an amplitude modulation signal, a phase modulation signal and a quadrature amplitude modulation signal.
The system mainly comprises: the system comprises a transmitting antenna, a transmitting link, a local oscillator link, a receiving antenna, a receiving link and a digital signal processing module; the digital signal processing module is respectively connected with the transmitting link input end, the local oscillation link control end and the receiving link output end; the transmitting link is used for synthesizing the communication signal from the digital signal processing module and the sensing signal from the local oscillator link to obtain a communication sensing integrated waveform signal, and radiating the communication sensing integrated waveform signal through the transmitting antenna; the receiving link receives communication sensing integrated signals through the receiving antenna, sensing signals in the integrated signals are mixed with local oscillation signals to obtain sensing baseband signals containing target information, the integrated signals are self-mixed to obtain communication baseband signals, and the sensing baseband signals and the communication baseband signals are output to the digital signal processing module.
The digital signal processing module is realized by adopting an FPGA or a DSP and is used for generating a transmitting communication baseband signal and a local oscillator control signal, cooperatively controlling the time-frequency relation of sensing signals generated by communication and local oscillator, and realizing the time-frequency multiplexing of the integrated waveform of the sense, wherein parameters of the cooperative control comprise communication and sensing signal time sequence, bandwidth, signal repetition period and signal power; the digital signal processing module is used for processing the received sensing baseband signal and the communication baseband signal and extracting sensing information and communication information of the target distance, speed and angle.
The transmitting link comprises a mixer, a filter, a combiner and a power amplifier circuit, wherein the mixer modulates a communication baseband signal to a carrier wave from a local oscillator, and synthesizes the communication baseband signal and a sensing signal from the local oscillator according to a power relation to obtain a communication sensing integrated signal, and the integrated signal is directly transmitted through an antenna or is shifted to a higher frequency for transmission through frequency conversion; the sensing signal and the communication signal adopt a time-frequency multiplexing working mode, and the two signals keep frequency difference, so that the receiving link filtering and the signal extraction are convenient; in order to ensure a perceived distance and a low distortion of the communication signal, the perceived signal power is higher than the communication signal power.
The receiving link comprises a low noise amplifier, a power divider, a mixer, a filter and a combiner circuit, wherein the mixer is divided into a perception signal mixer and a communication signal mixer; the local oscillation signal of the perception signal mixer is related to the transmitting signal; the local oscillation signal and the radio frequency input signal of the communication signal mixer are both from the communication sense integrated signal, and the difference frequency signal of the communication signal and the sensing signal, namely the communication baseband signal, is obtained through self-mixing.
The communication signal and the sensing signal are coherent, and the communication signal and the sensing signal are from the same local oscillation source or coherent local oscillation source; for the sensing signal, the phase noise cancellation effect related to the distance is realized by mixing the coherent characteristics of the receiving and transmitting signals; for communication signals, based on the system, phase noise cancellation of the communication signals is realized by mixing communication signal carriers in the integrated signals and sensing signal coherent characteristics serving as local oscillators, the influence of additional phase noise of a receiving and transmitting system and a space channel is eliminated, and the cancellation effect is irrelevant to the communication distance; the influence of Doppler frequency shift and carrier frequency shift on the communication signals can be eliminated based on the communication signal mixing mechanism in the system.
The communication signal and the perception signal can be transmitted and received simultaneously, and full duplex operation is realized through time-frequency multiplexing, or the communication signal and the perception signal are flexibly configured into time division multiplexing or frequency division multiplexing.
The beneficial effects are that: the communication perception integrated system and the waveform design method have the following advantages:
1. compared with the system proposal adopting the radar sensing and communication function time-sharing working mode in the prior art, the frequency spectrum utilization rate of the prior art proposal is low, and the contradiction between the radar sensing and the communication time distribution is difficult to solve; in the invention, communication and radar sensing signals can be transmitted and received simultaneously by a time-frequency multiplexing working mode, so that the communication and sensing performances are ensured, and the frequency spectrum utilization rate is obviously improved;
2. compared with the system proposal of adopting complex waveform design to realize the communication perception integrated function in the prior art, the waveform design of the prior art proposal is complex, which leads to great difficulty in processing digital signals and great mutual interference between radar perception and communication signals; the invention can realize the communication and perception integrated function by utilizing the traditional communication and perception signal waveforms through the system scheme and waveform joint design and the time-frequency multiplexing working mode, thereby remarkably reducing the digital signal processing difficulty and having small mutual interference between radar perception and communication signals;
3. compared with the prior art, the communication perception integrated signal synthesis method provided by the invention ensures the relativity of the perceived signal and the communication signal carrier, and the communication and perception receiving link realizes the additional phase noise cancellation of the radio frequency front-end system and the space channel by using the relativity mixing, thereby improving the signal-to-noise ratio of the baseband output signal; the communication signal mixing scheme may also eliminate doppler effects and carrier frequency offset effects.
Drawings
The drawings described herein are for illustration of selected embodiments only and not all possible implementations, and are not intended to limit the scope of the present application.
Fig. 1 is an example schematic diagram of an application scenario of a communication perception integrated system according to an embodiment of the present invention;
FIG. 2 is a schematic block diagram of a communication perception integrated system according to an embodiment of the present invention;
fig. 3 is an example of communication perception integrated time-frequency multiplexing waveform design based on FMCW radar signals and communication modulation signals according to an embodiment of the present invention: (a) is a real-time communication perception integrated composite signal waveform, (b) is a communication perception integrated composite signal waveform with maximized perception signal bandwidth, (c) is a multi-carrier communication perception integrated composite signal waveform with maximized perception signal bandwidth, and (d) is a communication perception integrated system baseband signal spectrum relation diagram;
FIG. 4 is a plot of radar-aware signal-to-phase noise cancellation ratio as a function of distance and offset frequency;
fig. 5 is two communication scenarios of a communication awareness integration system: (a) spatial channel scene (b) relay station scene.
Detailed Description
The invention is described in further detail below with reference to specific embodiments and figures.
It should be noted that, the illustrations provided in the present embodiment are only for illustrating the basic concept of the present invention by way of illustration, and the application scenario, system scheme components and waveform design related to the present invention are shown in the illustrations, and may be changed or more complex according to the actual implementation, which is not limited thereto.
Fig. 1 is a schematic diagram of an application scenario of a communication and sensing integrated system provided by an embodiment of the present invention, where the system is cooperatively designed with waveforms, and the system transmits signals as a communication and sensing integrated composite signal including communication and sensing signals, where the communication and sensing signals waveforms adopt a time-frequency multiplexing working mode, that is, the communication and sensing signals are "different in frequency and same in frequency", where the communication signals and sensing signals use the same frequency band in the working process of the system, and where the frequencies of the communication and sensing signals change according to a design rule over time, so that spectrum resources are fully utilized as possible.
The sensing signal waveform comprises a frequency modulation continuous wave FMCW signal and a pulse modulation signal, and the communication signal waveform comprises an amplitude modulation signal, a phase modulation signal and a quadrature amplitude modulation signal.
The system mainly comprises: the system comprises a transmitting antenna, a transmitting link, a local oscillator link, a receiving antenna, a receiving link and a digital signal processing module; the digital signal processing module is respectively connected with the transmitting link input end, the local oscillation link control end and the receiving link output end; the transmitting link is used for synthesizing the communication signal from the digital signal processing module and the sensing signal from the local oscillator link to obtain a communication sensing integrated waveform signal, and radiating the communication sensing integrated waveform signal through the transmitting antenna; the receiving link receives communication sensing integrated signals through the receiving antenna, sensing signals in the integrated signals are mixed with local oscillation signals to obtain sensing baseband signals containing target information, the integrated signals are self-mixed to obtain communication baseband signals, and the sensing baseband signals and the communication baseband signals are output to the digital signal processing module.
The communication signal and the sensing signal are coherent, and the communication signal and the sensing signal are from the same local oscillation source or coherent local oscillation source; for the sensing signal, the phase noise cancellation effect related to the distance is realized by mixing the coherent characteristics of the receiving and transmitting signals; for communication signals, based on the system, phase noise cancellation of the communication signals is realized by mixing communication signal carriers in the integrated signals and sensing signal coherent characteristics serving as local oscillators, the influence of additional phase noise of a receiving and transmitting system and a space channel is eliminated, and the cancellation effect is irrelevant to the communication distance; the influence of Doppler frequency shift and carrier frequency shift on the communication signals can be eliminated based on the communication signal mixing mechanism in the system. The communication signal and the perception signal can be transmitted and received simultaneously, and full duplex operation is realized through time-frequency multiplexing, or the communication signal and the perception signal are flexibly configured into time division multiplexing or frequency division multiplexing.
The working process comprises the following steps: the integrated waveform signal S1 emitted by the emission channel of the communication perception integrated system 1 is reflected by a radar perception target, the reflected integrated waveform signal S2 is received by the receiving channel of the communication perception integrated system 1, the radar perception target information is obtained through calculation of a digital signal processing module, and meanwhile, communication signals in the reflected signals are filtered; the integrated waveform signal S3 emitted by the emission channel of the communication perception integrated system 1 is received by the receiving channel of the communication perception integrated system 2, the communication perception integrated system 2 obtains the communication signal emitted by the communication perception integrated system 1 through the processes of local oscillation signal extraction, down-conversion, digital signal processing and the like, and simultaneously filters the radar perception signal in the received signal.
Fig. 2 is a schematic block diagram of a communication perception integrated system according to an embodiment of the present invention. The digital signal processing module comprises ADC, DAC, FPGA, DSP and other circuits for generating a transmitting communication baseband signal and a local oscillator control signal, cooperatively controlling the time-frequency relation of sensing signals generated by communication and local oscillator, and realizing the time-frequency multiplexing of the integrated waveform of the sense, wherein parameters of the cooperative control comprise communication and sensing signal time sequence, bandwidth, signal repetition period and signal power; the digital signal processing module is used for processing the received sensing baseband signal and the communication baseband signal and extracting sensing information and communication information of the target distance, speed and angle.
The transmitting link comprises circuits such as an up-converter UC, an amplifier AMP, a power synthesizer PC1, a power amplifier PA and the like; the up converter UC modulates the communication baseband signal to a carrier wave from the local oscillator LO, and synthesizes the communication baseband signal and a sensing signal from the local oscillator LO according to a power relation to obtain a communication sensing integrated signal, and the integrated signal is directly transmitted through an antenna or is shifted to a higher frequency for transmission through frequency conversion; the sensing signal and the communication signal adopt a time-frequency multiplexing working mode, and the two signals keep frequency difference, so that the receiving link filtering and the signal extraction are convenient; in order to ensure a perceived distance and a low distortion of the communication signal, the perceived signal power is higher than the communication signal power.
The local oscillation module of the local oscillation link is realized by adopting a phase-locked loop PLL, a direct digital frequency synthesizer DDS and other circuits; the receiving link comprises a low noise amplifier LNA, a power divider PS, an amplifier AMP, a down converter DC1 for radar sensing signals, a low pass filter LPF, an automatic gain/level control circuit AGC/ALC, a down converter DC2 for communication signals, a band pass filter BPF, a power synthesizer PC and other circuits; the system also includes a transmit antenna and a receive antenna.
The receiving link comprises a low noise amplifier, a power divider, a mixer, a filter and a combiner circuit, wherein the mixer is divided into a perception signal mixer and a communication signal mixer; the local oscillation signal of the perception signal mixer is related to the transmitting signal; the local oscillation signal and the radio frequency input signal of the communication signal mixer are both from the communication sense integrated signal, and the difference frequency signal of the communication signal and the sensing signal, namely the communication baseband signal, is obtained through self-mixing.
Working principle: the digital signal processing module is used for generating a transmitting communication baseband signal and a local oscillator control signal, cooperatively controlling the time-frequency relation of sensing signals generated by communication and local oscillators, realizing the time-frequency multiplexing of the integrated waveform of the sense, and cooperatively controlling parameters including communication and sensing signal time sequence, bandwidth, signal repetition period, signal power and the like; the digital signal processing module is also used for processing the received sensing and communication baseband signals and extracting sensing information and communication information such as target distance, speed, angle and the like; the transmitting link up-converts the communication baseband signal and synthesizes the communication baseband signal with the frequency modulation continuous wave FMCW radar sensing signal to be used as an integrated waveform signal and radiated out through a transmitting antenna; the receiving link receives radar sensing and communication signals simultaneously by utilizing a receiving antenna, and respectively down-converts the radar sensing baseband signals and the communication baseband signals; the local oscillator generates FMCW signals which are respectively used as the local oscillator signals of the radar sensing transmitting signal, the local oscillator signals of the communication transmitting link and the radar sensing signal receiving link, wherein the local oscillator signals of the radar sensing transmitting signal and the radar sensing signal receiving link are coherent, have phase noise cancellation effect, can cancel coherent phase noise in a signal transmission path, and the cancellation ratio is reduced along with the increase of the distance between radar sensing targets (as shown in figure 4); the local oscillator signal of the communication signal down-converter is extracted from the received communication perception integrated waveform signal, the space channel and the relay station have the same additional phase noise, doppler effect and carrier frequency offset influence on the communication signal and the communication carrier wave, and the additional phase noise, doppler effect and carrier frequency offset caused by the space channel and the relay station can be eliminated by utilizing the relativity of the local oscillator signal and the communication carrier wave signal (as shown in figure 5).
Fig. 3 is an example of a waveform design method of a communication perception integrated system according to an embodiment of the present invention. Fig. 3 (a) - (c) are time-frequency diagrams of radio frequency signals of a communication perception integrated system, radar perception signals are all FMCW signals, and the communication signals have a certain bandwidth f BW Is characterized in that the carrier frequency of the communication signal and the radar sensing signal keep a certain frequency difference f D The radar sensing signal and the communication signal are prevented from interfering with each other. In fig. 3 (a), the radar sensing signal and the communication signal are both time-continuous, and the real-time radar sensing and communication functions can be implemented; in fig. 3 (b), the radar sensing signal is continuous, the communication signal is discontinuous, and the radar sensing signal can maximally utilize the system operating bandwidth to realize high resolution; in fig. 3 (c), in order to increase the communication rate and bandwidth of fig. 3 (b), a multi-carrier communication method is adopted; FIG. 3 (d) is a diagram showing the frequency spectrum relationship of the received baseband signal of the communication perception integrated system, the radar perception baseband signal frequency f R Communication baseband signal frequency f Di A certain frequency protection bandwidth delta f is reserved between the two g Preventing mutual interference.

Claims (6)

1. A communication perception integrated system and a waveform design method are characterized in that the system and the waveform are cooperatively designed, a signal transmitted by the system is a general sense integrated composite signal comprising communication and perception signals, the communication and perception signals adopt a time-frequency multiplexing working mode, namely the communication and perception signals are different in frequency at the same time and different in the same frequency, the communication signals and the perception signals use the same frequency band in the working process of the system, the frequency of the communication and perception signals changes along with the time according to the design rule, and the frequency spectrum resource is fully utilized as much as possible;
the sensing signal waveform comprises a frequency modulation continuous wave FMCW signal and a pulse modulation signal, and the communication signal waveform comprises an amplitude modulation signal, a phase modulation signal and a quadrature amplitude modulation signal;
the system mainly comprises: the system comprises a transmitting antenna, a transmitting link, a local oscillator link, a receiving antenna, a receiving link and a digital signal processing module; the digital signal processing module is respectively connected with the transmitting link input end, the local oscillation link control end and the receiving link output end; the transmitting link is used for synthesizing the communication signal from the digital signal processing module and the sensing signal from the local oscillator link to obtain a communication sensing integrated waveform signal, and radiating the communication sensing integrated waveform signal through the transmitting antenna; the receiving link receives communication sensing integrated signals through the receiving antenna, sensing signals in the integrated signals are mixed with local oscillation signals to obtain sensing baseband signals containing target information, the integrated signals are self-mixed to obtain communication baseband signals, and the sensing baseband signals and the communication baseband signals are output to the digital signal processing module.
2. The integrated communication and sensing system and the waveform design method according to claim 1, wherein the digital signal processing module is implemented by adopting an FPGA or a DSP, and is configured to generate a transmission communication baseband signal and a local oscillator control signal, cooperatively control a time-frequency relationship between a sensing signal generated by communication and local oscillator, and implement a time-frequency multiplexing integrated sensing waveform, and parameters of cooperative control include a communication and sensing signal timing sequence, a bandwidth, a signal repetition period, and a signal power; the digital signal processing module is used for processing the received sensing baseband signal and the communication baseband signal and extracting sensing information and communication information of the target distance, speed and angle.
3. The integrated communication perception system and the waveform design method according to claim 1, wherein the transmitting link comprises a mixer, a filter, a combiner and a power amplifier circuit, wherein the mixer modulates a communication baseband signal onto a carrier from a local oscillator, and synthesizes the communication baseband signal and a perception signal from the local oscillator according to a power relation to obtain an integrated communication perception signal, and the integrated communication perception signal is directly transmitted through an antenna or is transmitted through frequency conversion and shifting to a higher frequency again; the sensing signal and the communication signal adopt a time-frequency multiplexing working mode, and the two signals keep frequency difference, so that the receiving link filtering and the signal extraction are convenient; in order to ensure a perceived distance and a low distortion of the communication signal, the perceived signal power is higher than the communication signal power.
4. The integrated communication perception system and waveform design method according to claim 1, wherein the receiving link comprises a low noise amplifier, a power divider, a mixer, a filter, a combiner circuit, wherein the mixer is divided into a perception signal mixer and a communication signal mixer; the local oscillation signal of the perception signal mixer is related to the transmitting signal; the local oscillation signal and the radio frequency input signal of the communication signal mixer are both from the communication sense integrated signal, and the difference frequency signal of the communication signal and the sensing signal, namely the communication baseband signal, is obtained through self-mixing.
5. The integrated communication and sensing system and the waveform design method according to claim 1, wherein the communication signal and the sensing signal are coherent, and are from the same local oscillator source or coherent local oscillator source; for the sensing signal, the phase noise cancellation effect related to the distance is realized by mixing the coherent characteristics of the receiving and transmitting signals; for communication signals, based on the system, phase noise cancellation of the communication signals is realized by mixing communication signal carriers in the integrated signals and sensing signal coherent characteristics serving as local oscillators, the influence of additional phase noise of a receiving and transmitting system and a space channel is eliminated, and the cancellation effect is irrelevant to the communication distance; the influence of Doppler frequency shift and carrier frequency shift on the communication signals can be eliminated based on the communication signal mixing mechanism in the system.
6. The integrated communication and sensing system and the waveform design method according to claim 5, wherein the communication signal and the sensing signal can be transmitted and received simultaneously, and the full duplex operation is realized by time-frequency multiplexing or flexibly configured as time-division multiplexing or frequency-division multiplexing.
CN202211553853.9A 2022-12-06 2022-12-06 Communication perception integrated system and waveform design method Pending CN116192321A (en)

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