Communication sensing integration method and device based on OFDM signal

Abstract

The invention discloses a communication perception integration method and device based on OFDM signals. The method is applied to a receiving end and comprises the steps that a first signal is acquired, the first signal is an echo signal reflected from a target, and the echo signal reflected from the target is an OFDM signal; performing primary carrier frequency recovery compensation processing on the first signal to obtain a primary compensation signal; performing secondary carrier frequency recovery compensation processing on the primary compensation signal to obtain a secondary compensation signal; and multiplexing and demodulating the secondary compensation signal to realize communication and perception. According to the invention, the carrier frequency offset of the received OFDM signal is reduced by carrying out two-stage carrier frequency recovery processing on the communication and sensing integrated signal, so that the problem of poor communication and sensing performance caused by the carrier frequency offset of the OFDM signal is solved, and the technical effect of improving the communication and sensing performance is realized.

Description

Technical Field

[0001] The present application relates to the technical field of communication perception integration, and in particular, to a communication perception integration method and device based on OFDM signals. Background Art

[0002] With the continuous development of electronic information technology, the application of integrated interaural communication (hereinafter referred to as ISAC) systems in communication systems has become increasingly widespread. With the upcoming sixth-generation communication (6G) system, the 6G system will utilize higher frequency bands, such as W-band millimeter wave (mmWave) and even terahertz (THz) bands, to meet the needs of high data rate communication and radar sensing resolution. However, the millimeter wave / terahertz ISAC system based on traditional pure electronic methods is difficult to generate broadband millimeter wave / terahertz signals, and the reconfigurability of pure electronic systems is also poor. The inventors found that the MmWave / THzISAC system based on photon-assisted technology can easily generate broadband MmWave / THz signals, while achieving ultra-large capacity communication and high-resolution sensing.

[0003] The inventors found that orthogonal frequency division multiplexing (OFDM) has become the mainstream waveform of 5G systems due to its advantages of high spectral efficiency and resistance to selective channel fading. OFDM millimeter wave / terahertz signal generation based on photon heterodyne beat frequency technology is a good way. However, the frequency of the two optical carriers generated by two free-running external cavity lasers is unstable due to the influence of the laser linewidth, and the frequency of the electric local oscillator used for down-conversion at the receiving end is inaccurate. Therefore, the received OFDM signal will have a large carrier frequency offset (CFO). CFO will destroy the orthogonality of the subcarriers and generate inter-carrier interference (ICI), making it difficult to reconstruct the transmitted signal at the receiving end.

[0004] Therefore, the present application is proposed to address the problem of poor communication and perception performance caused by OFDM signal carrier frequency deviation. Summary of the invention

[0005] The main purpose of this application is to provide a communication and perception integration method and device based on OFDM signals to solve the problem of poor communication and perception performance caused by OFDM signal carrier frequency deviation, thereby achieving the technical effect of improving communication and perception performance.

[0006] In order to achieve the above-mentioned purpose, in the first aspect of the present application, a communication perception integration method based on OFDM signal is proposed, which is applied to the receiving end, comprising: Acquire a first signal, wherein the first signal is an echo signal reflected from a target, and the echo signal reflected from the target is an OFDM signal; Performing a primary carrier frequency recovery compensation process on the first signal to obtain a primary compensation signal; Performing secondary carrier frequency recovery compensation processing on the primary compensation signal to obtain a secondary compensation signal; The secondary compensation signal is multiplexed and demodulated to achieve communication and perception.

[0007] In some optional embodiments of the present application, performing primary carrier frequency recovery compensation processing on the first signal to obtain a primary compensation signal includes: Performing identification processing based on the first frequency offset on the first signal to obtain signal first frequency offset data, wherein the signal first frequency offset data is data used to represent the first frequency offset of the first signal; The first frequency offset data of the signal is subjected to compensation processing based on the first frequency offset to obtain the first-level compensation signal.

[0008] In some optional embodiments of the present application, performing secondary carrier frequency recovery compensation processing on the primary compensation signal to obtain the secondary compensation signal includes: Performing identification processing based on the second frequency offset on the primary compensation signal to obtain signal second frequency offset data, wherein the signal second frequency offset data is data used to represent the second frequency offset of the first signal; The second frequency offset data of the signal is subjected to compensation processing based on the second frequency offset to obtain the secondary compensation signal.

[0009] In some optional embodiments of the present application, the method includes: The first frequency deviation is a fractional frequency deviation, and the second frequency deviation is an integer frequency deviation.

[0010] In some optional embodiments of the present application, multiplexing and demodulating the secondary compensation signal to achieve communication and perception includes: Performing OFMD demodulation on the secondary compensation signal to obtain a demodulated signal; Carrier phase recovery and bit error rate calculation processing are performed on the demodulated signal to achieve communication processing.

[0011] In some optional embodiments of the present application, multiplexing and demodulating the secondary compensation signal to achieve communication and perception includes: Performing OFMD demodulation on the secondary compensation signal to obtain a demodulated signal; Subcarrier demodulation and target distance calculation processing are performed on the demodulated signal to achieve perception processing.

[0012] According to the second aspect of the present application, a communication perception integration method based on OFDM signals is proposed, which is applied to the transmitting end and includes: Construct baseband OFDM transmission signal; The baseband OFDM transmission signal is subjected to optical OFDM modulation processing to obtain and output an electrical millimeter wave signal.

[0013] According to the third aspect of the present application, a communication perception integrated device based on OFDM signals is proposed, which is applied to a receiving end and includes: A signal acquisition module, used to acquire a first signal, wherein the first signal is an echo signal reflected from a target, and the echo signal reflected from the target is an OFDM signal; A first compensation module, configured to perform a primary carrier frequency recovery compensation process on the first signal to obtain a primary compensation signal; A second compensation module, configured to perform a secondary carrier frequency recovery compensation process on the primary compensation signal to obtain a secondary compensation signal; The communication perception module is used to multiplex and demodulate the secondary compensation signal to achieve communication and perception.

[0014] According to a fourth aspect of the present application, a computer-readable storage medium is proposed, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the above-mentioned communication perception integration method based on OFDM signals.

[0015] According to the fifth aspect of the present application, an electronic device is proposed, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor executes the above-mentioned communication perception integration method based on OFDM signals.

[0016] The technical solution provided by the embodiments of the present application may have the following beneficial effects: In the present application, a communication and perception integration method based on OFDM signals is proposed, which is applied to the receiving end, including: obtaining a first signal, wherein the first signal is an echo signal reflected from a target, and the echo signal reflected from the target is an OFDM signal; performing a first-level carrier frequency recovery and compensation process on the first signal to obtain a first-level compensation signal; performing a second-level carrier frequency recovery and compensation process on the first-level compensation signal to obtain a second-level compensation signal; multiplexing and demodulating the second-level compensation signal to achieve communication and perception. By performing a two-stage carrier frequency recovery process on the communication and perception integrated signal to reduce the carrier frequency deviation of the received OFDM signal, the problem of poor communication and perception performance caused by the carrier frequency deviation of the OFDM signal is solved, and the technical effect of improving communication and perception performance is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The schematic embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application. In the drawings: Figure 1 A flowchart of a communication perception integration method based on OFDM signals provided in this application; Figure 2 A schematic diagram of an OFDM signal-based communication and perception integrated device provided in this application. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0019] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0020] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0021] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0022] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] ISAC signals can be divided into two categories: multiplexed ISAC signals and shared ISAC signals. Multiplexed ISAC signals achieve communication and sensing based on time division multiplexing (TDM) or frequency division multiplexing (FDM). Most of the existing ISAC systems use multiplexed ISAC signals, which consumes additional spectrum resources or time domain resources, and the spectrum utilization rate is not high. In addition, most other signals are not resistant to selective channel fading and are not compatible with existing communication facilities. Shared ISAC signals can achieve communication and sensing at the same time without the need for additional spectrum resources.

[0024] Orthogonal frequency division multiplexing (OFDM) is a good way to generate OFDM millimeter wave / terahertz signals based on photon heterodyne beat frequency technology due to its advantages of high spectrum efficiency and resistance to selective channel fading. However, the frequency of the two optical carriers generated by two free-running external cavity lasers is unstable due to the influence of laser line width, and the frequency of the electric local oscillator used for down-conversion at the receiving end is inaccurate. Therefore, the received OFDM signal will have a large carrier frequency offset (CFO). CFO will destroy the orthogonality of the subcarriers and generate inter-carrier interference.

[0025] Therefore, an embodiment of the present application provides a communication perception integration method based on OFDM signals, by performing two-stage carrier frequency recovery processing on the communication perception integration signal to reduce the carrier frequency deviation of the received OFDM signal.

[0026] In some optional embodiments of the present application, a communication perception integration method based on OFDM signals is proposed, which is applied to the receiving end. Figure 1 A flowchart of a communication perception integration method based on OFDM signals provided in this application, the method comprising the following steps: S101: Acquire a first signal; The first signal is an echo signal reflected from the target, and the echo signal reflected from the target is an OFDM signal.

[0027] In an optional embodiment of the present application, the ISAC system includes a transmitting end, a communication receiving end and a sensing receiving end.

[0028] At the receiving end of the communication part, the electrical millimeter wave signal output by the low noise amplifier (LNA) at a preset carrier frequency is fed into a pair of antennas. The millimeter wave electrical signal is transmitted to the single-input single-output (SISO) wireless link in the W band using one antenna. After the SISO wireless transmission, the electrical millimeter wave signal is received by another antenna and then amplified by the LNA. The millimeter wave electrical signal is then mixed with the electrical local oscillator (ELO) signal of a preset frequency to generate an intermediate frequency signal. After the intermediate frequency signal is amplified by the electrical amplifier (EA), it is captured by a real-time oscilloscope (OSC), and the data is stored for subsequent digital signal processing (DSP).

[0029] At the receiving end of the radar sensing part, the millimeter wave electrical signal is first transmitted by one antenna, then reflected by the target object, and finally collected by another antenna. Similarly, the received echo signal is amplified by the LNA with a preset gain, mixed with the ELO with a preset operating frequency, and amplified by the EA. Finally, the generated intermediate frequency signal is captured by the OSC, and the data is stored for subsequent DSP processing.

[0030] In the DSP processing at the receiving end, after synchronous processing of the signal, the echo signal y(t) reflected from the target received by the receiving end has a carrier frequency deviation ε and a time delay τ. The echo signal is expressed as: , where H (m, n) is the frequency response of the channel, s tx (mN+n) represents the complex modulated signal at the nth subcarrier of the mth OFDM symbol, fn is the frequency of the nth subcarrier, T OFDM is the total OFDM symbol duration including CP. rect(t / T OFDM ) indicates T OFDM The rectangular window during the period, Z(m, n) is additive white Gaussian noise (AWGN). τ = 2R / c, where R is the distance between the target and the transmitter, and c is the speed of light.

[0031] S102: performing a first-level carrier frequency recovery compensation process on the first signal to obtain a first-level compensation signal; In some optional embodiments of the present application, a communication perception integration method based on OFDM signal is proposed, and a first-level carrier frequency recovery compensation processing is performed on the first signal. The method includes the following steps: The first signal is identified based on the first frequency offset to obtain signal first frequency offset data, wherein the signal first frequency offset data is data used to represent the first frequency offset of the first signal; the signal first frequency offset data is compensated based on the first frequency offset to obtain a first-level compensation signal. The first frequency offset is a fractional frequency offset (FFO).

[0032] In the DSP processing at the receiving end, after the signal is synchronized, the first OFDM symbol (y TS ) corresponds to the TS (x TS ), the first frequency offset compensation is performed on the signal, which is expressed as: , where NCP is the length of CP, and arg(·) is used to calculate the phase angle, (·) represents the conjugate operation. Compensate for FFO.

[0033] S103: performing secondary carrier frequency recovery compensation processing on the primary compensation signal to obtain a secondary compensation signal; In some optional embodiments of the present application, a communication perception integration method based on OFDM signal is proposed, and a secondary carrier frequency recovery compensation process is performed on the primary compensation signal. The method includes the following steps: The first-level compensation signal is processed based on the second frequency offset to obtain the signal second frequency offset data, wherein the signal second frequency offset data is data used to represent the second frequency offset of the first signal; the signal second frequency offset data is processed based on the second frequency offset to obtain the second-level compensation signal. The second frequency offset is an integer frequency offset (IFO).

[0034] In the above After compensating the FFO, the IFO is calculated in the frequency domain by cyclic shifting the frequency domain data. The IFO compensation is expressed as: , where xcorr(·) is used to calculate the cross-correlation and maxindex(·) returns the peak value. TS_FFT and x TS_FFT They are the frequency domain data of TS at the transmitting end and the receiving end respectively.

[0035] In an optional embodiment of the present application, after the digital signal is synchronized at the receiving end, the signal is subjected to first-level fractional frequency offset (FFO) compensation and second-level integer frequency offset (IFO) compensation to compensate for the received OFDM signal with a large carrier frequency offset, so as to solve the problem that the received OFDM signal will have a large carrier frequency offset (CFO) caused by the OFDM millimeter wave / terahertz signal generation based on photonic heterodyne beat frequency technology, thereby improving communication and perception performance.

[0036] S104: Multiplex and demodulate the secondary compensation signal to achieve communication and perception.

[0037] In some optional embodiments of the present application, a communication and perception integration method based on OFDM signals is proposed, and the secondary compensation signal is multiplexed and demodulated to achieve communication and perception, including: The secondary compensation signal is demodulated by OFMD to obtain a demodulated signal; the demodulated signal is subjected to carrier phase recovery and bit error rate calculation processing to realize communication processing.

[0038] In an optional embodiment of the present application, digital signal processing is performed at the communication receiving end, including: down-conversion, resampling, synchronization, serial-to-parallel conversion, carrier frequency recovery, CP removal, fast Fourier transform (FFT) to achieve OFDM signal demodulation, intra-symbol frequency domain averaging (ISFA) for channel estimation, carrier phase recovery and bit error rate (BER) calculation.

[0039] In some optional embodiments of the present application, a communication and perception integration method based on OFDM signals is proposed, and the secondary compensation signal is multiplexed and demodulated to achieve communication and perception, including: The secondary compensation signal is demodulated by OFMD to obtain a demodulated signal; the demodulated signal is subjected to subcarrier demodulation and target distance calculation processing to realize perception processing.

[0040] Digital signal processing at the sensing receiving end includes: down-conversion, resampling, synchronization, serial-to-parallel conversion, carrier frequency recovery, CP removal, FFT to achieve OFDM signal demodulation, IFFT to achieve subcarrier demodulation and target distance calculation.

[0041] In an optional embodiment of the present application, during the digital signal processing at the receiving end, after carrier frequency recovery and CP removal, a fast Fourier transform (FFT) module is used to implement OFDM demodulation. Then, intra-symbol frequency domain averaging (ISFA) is used in the DSP for channel estimation. For the frequency data of different subcarriers in an OFDM symbol, phase noise compensation is completed by inserting pilots in each OFDM symbol.

[0042] From the echo signal reflected from the target received by the above receiver, it can be seen that the delay τ introduces a line shift along the frequency axis. The transmitted information is removed from the received information symbol by element-by-element complex division. The time-frequency matrix response of the perception channel can be described as: , where Srx(m,n) is the receiving information matrix and Stx(m,n) is the sending information matrix.

[0043] In the numerical signal processing at the sensing receiving end, if there is carrier frequency offset in the ISAC system, the fractional frequency offset (FFO) will affect the orthogonality between subcarriers, resulting in inaccurate Hs. IFO introduces s rx The frequency domain cyclic shift of , resulting in an erroneous Hs. Therefore, for the radar perception part of digital signal processing, the carrier frequency offset (CFO) also needs to be compensated. After the carrier frequency is recovered, IFFT operation is performed along the frequency axis, and the distance R can be calculated from the peak value of the Hs column. Therefore, the distance R is: , where k is the peak value, Δf is the subcarrier spacing, and c is the speed of light.

[0044] In some optional embodiments of the present application, a communication perception integration method based on OFDM signals is proposed, which is applied to the transmitting end and includes: Construct a baseband OFDM transmission signal; perform optical OFDM modulation processing on the baseband OFDM transmission signal to obtain and output an electrical millimeter wave signal.

[0045] In an optional embodiment of the present application, at the transmitting end, a pseudo-random binary sequence (PRBS) is generated, and quadrature amplitude modulation (QAM) and subcarrier mapping are performed on it in turn, a pilot is inserted for carrier phase recovery (CPR), and a training sequence (TS) is inserted for synchronization, carrier frequency recovery (CFR) and channel estimation. Then, the inverse fast Fourier transform (IFFT) is used to implement OFDM modulation, and a cyclic prefix (CP) sequence is inserted into the generated OFDM signal to prevent inter-symbol interference (ISI). The generated baseband OFDM signal is sent to an arbitrary waveform generator (AWG) after serial-to-parallel conversion and upsampling. The baseband OFDM signal after serial-to-parallel conversion and upsampling is output by the waveform generator (AWG) and sent to the optical I / Q modulator to realize optical OFDM modulation. The external cavity laser (hereinafter referred to as ECL) 1 generates an optical continuous wave (CW) with a preset center frequency (such as 193.4144 THz), and ECL2 generates another optical local oscillator signal (OLO) with a preset center frequency (such as 193.5089 THz). The frequency interval between the optical OFDM signal and the OLO signal is 94.5 GHz. The output of the optical I / Q modulator is input into an erbium-doped fiber amplifier (EDFA) to compensate for the modulation and insertion loss of the optical I / Q modulator and keep the power of the EDFA output close to the OLO signal power. Next, the output of the EDFA is coupled with the OLO signal in an optical coupler (OC). The optical millimeter-wave signal generated after coupling is transmitted via a single-mode fiber (SMF), and the optical signal power of the input photodiode (PD) is adjusted by a variable optical attenuator (VOA). The optical millimeter-wave signal is beat by the PD to generate an electrical millimeter-wave signal, which is then sent to a low-noise amplifier (LNA).

[0046] In an optional embodiment of the present application, at the transmitting end, a pseudo-random binary sequence (PRBS) is generated. After quadrature amplitude modulation (QAM) mapping and subcarrier mapping, a pilot is inserted for carrier phase recovery (CPR). Then, a training sequence (TS) is inserted for synchronization, CFR, and channel estimation. OFDM modulation is implemented using inverse fast Fourier transform (IFFT). Then, a cyclic prefix (CP) sequence is inserted to prevent inter-symbol interference (ISI). The generated baseband OFDM signal is sent to a digital-to-analog converter (DAC) after parallel-to-serial conversion and upsampling, expressed as: , where m represents a single OFDM symbol index within a total of m OFDM symbols, and n represents a single subcarrier index within a total of n subcarriers. stx (mN+n) represents the complex modulated signal at the nth subcarrier of the mth OFDM symbol. fn is the frequency of the nth subcarrier, and TOFDM is the total OFDM symbol duration including CP. rect(t / T OFDM) Indicates T OFDM Rectangular window during.

[0047] In some optional embodiments of the present application, a communication and perception integrated device based on OFDM signals is proposed, which is characterized in that it is applied to a receiving end and includes: A signal acquisition module 21, configured to acquire a first signal, wherein the first signal is an echo signal reflected from a target, and the echo signal reflected from the target is an OFDM signal; A first compensation module 22, configured to perform a primary carrier frequency recovery compensation process on the first signal to obtain a primary compensation signal; The second compensation module 23 is used to perform a secondary carrier frequency recovery compensation process on the primary compensation signal to obtain a secondary compensation signal; The communication perception module 24 is used to multiplex and demodulate the secondary compensation signal to achieve communication and perception.

[0048] In some optional embodiments of the present application, a communication and perception integrated device based on OFDM signals is proposed, which is characterized in that it is applied to a transmitting end and includes: A signal generation module, used to construct a baseband OFDM transmission signal; The optical modulation and output module is used to perform optical OFDM modulation processing on the baseband OFDM transmission signal to obtain and output the electrical millimeter wave signal.

[0049] The specific manner of executing the operation of each unit in the above embodiment has been described in detail in the embodiment of the method, and will not be elaborated here.

[0050] In summary, in this application, a communication and perception integration method based on OFDM signals is proposed, which is applied to the receiving end, including: obtaining a first signal, wherein the first signal is an echo signal reflected from a target, and the echo signal reflected from the target is an OFDM signal; performing a first-level carrier frequency recovery and compensation process on the first signal to obtain a first-level compensation signal; performing a second-level carrier frequency recovery and compensation process on the first-level compensation signal to obtain a second-level compensation signal; multiplexing and demodulating the second-level compensation signal to achieve communication and perception. By performing a two-stage carrier frequency recovery process on the communication and perception integrated signal to reduce the carrier frequency deviation of the received OFDM signal, the problem of poor communication and perception performance caused by the carrier frequency deviation of the OFDM signal is solved, and the technical effect of improving communication and perception performance is achieved.

[0051] The flow chart and block diagram in the accompanying drawings show the possible architecture, function and operation of the device and method according to multiple embodiments of the present disclosure. In this regard, each square box in the flow chart or block diagram can represent a part of a module, a program segment or an instruction, and a part of the module, a program segment or an instruction includes one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two continuous square boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of special hardware and computer instructions.

[0052] Unless the context clearly indicates otherwise, the singular form of the words used herein and in the appended claims includes the plural and vice versa. Thus, when referring to the singular, the plural form of the corresponding term is generally included. Similarly, the words "comprise" and "include" are to be interpreted as inclusive rather than exclusive. Likewise, the terms "include" and "or" should be interpreted as inclusive unless such interpretation is expressly prohibited herein. Where the term "example" is used herein, particularly when it is located after a group of terms, the "example" is merely exemplary and illustrative and should not be considered exclusive or comprehensive.

[0053] Further aspects and scopes of adaptability become apparent from the description provided herein. It should be understood that various aspects of the present application can be implemented individually or in combination with one or more other aspects. It should also be understood that the description and specific embodiments herein are intended for purposes of illustration only and are not intended to limit the scope of the present application.

[0054] Several embodiments of the present disclosure are described in detail above, but it is obvious that those skilled in the art can make various modifications and variations to the embodiments of the present disclosure without departing from the spirit and scope of the present disclosure. The protection scope of the present disclosure is defined by the attached claims.

Claims

1. A communication perception integration method based on OFDM signals, characterized in that: Applied to the receiving end, including: Acquire a first signal, wherein the first signal is an echo signal reflected from a target, and the echo signal reflected from the target is an OFDM signal; Performing a primary carrier frequency recovery compensation process on the first signal to obtain a primary compensation signal; Performing secondary carrier frequency recovery compensation processing on the primary compensation signal to obtain a secondary compensation signal; The secondary compensation signal is multiplexed and demodulated to achieve communication and perception.

2. The communication perception integration method according to claim 1, characterized in that: Performing a first-level carrier frequency recovery compensation process on the first signal to obtain a first-level compensation signal includes: Performing identification processing based on a first frequency offset on the first signal to obtain signal first frequency offset data, wherein the signal first frequency offset data is data used to represent the first frequency offset of the first signal; The first frequency offset data of the signal is subjected to compensation processing based on the first frequency offset to obtain the first-level compensation signal.

3. The communication perception integration method according to claim 1, characterized in that: Performing secondary carrier frequency recovery compensation processing on the primary compensation signal to obtain a secondary compensation signal includes: Performing identification processing based on the second frequency offset on the primary compensation signal to obtain signal second frequency offset data, wherein the signal second frequency offset data is data used to represent the second frequency offset of the first signal; The second frequency offset data of the signal is subjected to compensation processing based on the second frequency offset to obtain the secondary compensation signal.

4. The communication perception integration method according to claim 2 or 3, characterized in that: The method comprises: The first frequency deviation is a fractional frequency deviation, and the second frequency deviation is an integer frequency deviation.

5. The communication perception integration method according to claim 1, characterized in that: Multiplexing and demodulating the secondary compensation signal to achieve communication and perception includes: Performing OFMD demodulation on the secondary compensation signal to obtain a demodulated signal; Carrier phase recovery and bit error rate calculation processing are performed on the demodulated signal to achieve communication processing.

6. The communication perception integration method according to claim 1, characterized in that: Multiplexing and demodulating the secondary compensation signal to achieve communication and perception includes: Performing OFMD demodulation on the secondary compensation signal to obtain a demodulated signal; Subcarrier demodulation and target distance calculation processing are performed on the demodulated signal to achieve perception processing.

7. A communication perception integration method based on OFDM signals, characterized in that: Applied to the transmitter, including: Construct baseband OFDM transmission signal; The baseband OFDM transmission signal is subjected to optical OFDM modulation processing to obtain and output an electrical millimeter wave signal.

8. A communication and perception integrated device based on OFDM signals, characterized in that: Applied to the receiving end, including: A signal acquisition module, used to acquire a first signal, wherein the first signal is an echo signal reflected from a target, and the echo signal reflected from the target is an OFDM signal; A first compensation module, configured to perform a primary carrier frequency recovery compensation process on the first signal to obtain a primary compensation signal; A second compensation module, configured to perform a secondary carrier frequency recovery compensation process on the primary compensation signal to obtain a secondary compensation signal; The communication perception module is used to multiplex and demodulate the secondary compensation signal to achieve communication and perception.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the communication perception integration method based on OFDM signals as described in any one of claims 1-6 or claim 7.

10. An electronic device, characterized in that: include: at least one processor; And a memory communicatively connected to the at least one processor; wherein the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor executes the communication perception integration method based on OFDM signals as described in any one of claims 1-6 or claim 7.

Images