Method, Apparatus, and Device for Transmitting and Receiving Radar-Communication Integrated Signals

Abstract

A method for transmitting and receiving an integrated radar communication signal, and an apparatus thereof, relate to the technical field of communication, the method includes: determining a polarization state of a first signal based on communication information bits to be transmitted (step 201); and transmitting the first signal based on the polarization state of the first signal (step 202), where the first signal is a radar signal.

Description

Technical Field

[0001] (Cross - reference to related applications) This application claims the priority of Chinese Patent Application No. 202110026232.4, filed in China on January 8, 2021, and all of its contents are incorporated herein by reference.

[0002] This application belongs to the technical field of communications, and specifically relates to a method for transmitting, receiving, and a device for integrated radar - communication signals.

Background Art

[0003] The integration of communication and sensing is to realize the integrated design of communication functions and sensing functions through spectrum sharing and hardware sharing in the same system. The system can transmit information, sense information such as azimuth, distance, speed, etc., and detect, track, and recognize target devices or events. The communication system and the sensing system complement each other, realizing the improvement of the overall performance and bringing a better service experience.

[0004] Currently, quite a lot of research has been done on the integrated design of radar systems and communication systems. Typical combination designs include spectrum co - existence where the two systems operate independently and can exchange information to reduce mutual interference, receiver - end sharing where the transmitting ends of the two systems transmit their respective signal waveforms and the waveforms of the two systems need to be orthogonal so as not to affect each other's reception detection, transmitter - end sharing where the transmitter transmits a combined radar - communication waveform, and transceiver - end sharing where both the transmitting and receiving sides of the two systems share resources and need to use combined waveforms or waveforms in an orthogonal relationship. The integrated radar - communication design focuses on waveform design. In the integrated waveform design, it is important to reduce the interference between communication signals and sensing signals as much as possible, meet the requirements for communication functions and sensing functions, and improve spectrum efficiency on the premise of ensuring system performance.

[0005] However, in the current mainstream integrated radar-communication waveform design, the adoption of a combined waveform requires complex design and optimization, and in many cases, a trade-off between radar detection performance and communication performance must be made. For example, in order to ensure the function of radar detection, the spectral efficiency and demodulation performance of the communication system may decrease. However, due to the modulation of communication information, the fuzzy function of the radar waveform is affected, resulting in a decrease in the detection performance of the radar signal.

Summary of the Invention

Problems to be Solved by the Invention

[0006] Embodiments of the present application provide a method, a receiving method, and a device for transmitting an integrated radar-communication signal that can solve the problem in the related art that the transmission of an integrated radar-communication signal cannot achieve both radar detection performance and communication performance.

Means for Solving the Problems

[0007] In a first aspect, an embodiment of the present application is a method for transmitting an integrated radar-communication signal executed by a first communication device, comprising: identifying a polarization state of a first signal based on communication information bits to be transmitted; transmitting the first signal based on the polarization state of the first signal, wherein the first signal is a radar signal. The method provides the above method.

[0008] In a second aspect, an embodiment of the present application is a method for receiving an integrated radar-communication signal executed by a second communication device, comprising receiving a first signal transmitted from a first communication device, wherein the first signal is a radar signal, and the polarization state of the first signal is identified by the first communication device based on communication information bits to be transmitted. The method provides the above method. The first signal is a radar signal, and the polarization state of the first signal is determined by the first communication device based on the communication information bits to be transmitted.

[0009] In a third aspect, an embodiment of the present application is A first identification module for identifying the polarization state of the first signal based on communication information bits to be transmitted; A transmission module for transmitting the first signal based on the polarization state of the first signal, and includes; The first signal is a radar signal, and a communication device is provided.

[0010] In a fourth aspect, an embodiment of the present application includes A receiving module for receiving a first signal transmitted from a first communication device, The first signal is a radar signal, and the polarization state of the first signal is identified by the first communication device based on communication information bits to be transmitted, and a communication device is provided.

[0011] In a fifth aspect, an embodiment of the present application includes a processor, a memory, and a program or command stored in the memory and executable on the processor. When the program or command is executed by the processor, the method described in the first aspect or the steps of the method described in the second aspect are realized, and an electronic device is further provided.

[0012] In a sixth aspect, an embodiment of the present application further provides a readable storage medium storing a program or command that, when executed by a processor, realizes the method described in the first aspect or the steps of the method described in the second aspect.

[0013] In a seventh aspect, an embodiment of the present application includes a processor and a communication interface. The communication interface is coupled to the processor, and the processor executes a program or command to realize the method described in the first aspect or the method described in the second aspect, and a chip is provided.

[0014] In an eighth aspect, an embodiment of the present application provides a computer program product stored in a non-volatile storage medium and executed by at least one processor to realize the steps of the method described in the first aspect or the method described in the second aspect.

Advantages of the Invention

[0015] As described above, in the embodiments of the present application, the polarization state of the first signal is specified based on the communication information bits to be transmitted, and the first signal is transmitted based on the specified polarization state of the first signal, thereby realizing the integrated transmission of the radar signal and the communication signal, enabling radar detection of the target and transmission of communication information, and contributing to the compatibility between the radar detection performance and the communication performance.

Brief Description of the Drawings

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Best Mode for Carrying Out the Invention

[0017] In the following, while referring to the drawings in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Naturally, the described embodiments are 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 those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0018] The terms "first", "second", etc. in the description and claims of the present application are not for explaining a specific order or sequence, but for distinguishing similar objects. It should be understood that such terms may be replaced with each other in appropriate cases so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein. Also, in the description and claims, "and / or" represents at least one of the connected objects, and the symbol " / " generally represents that the related objects before and after are in an "or" relationship.

[0019] It should be noted that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system. For example, it can also be used in other wireless communication systems such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the technology described can also be used in other systems and radio communication technologies in addition to the systems and radio communication technologies described above. However, although these technologies are applicable to applications other than NR system applications, such as 6 th Generation (6G) communication systems, in the following description, a new radio (NR) system is described for illustrative purposes, and NR technical terms are used in many of the following descriptions.

[0020] FIG. 1 shows a structural diagram of a wireless communication system to which an embodiment of the present application is applicable. The wireless communication system includes a terminal 11 and a network-side device 12. Among them, the terminal 11 may also be referred to as a terminal device or a user equipment (UE). The terminal 11 may be a mobile phone, a tablet personal computer, a laptop computer (also called a notebook computer), a personal digital assistant (PDA), a portable information terminal, a netbook, an ultra-mobile personal computer (UMPC), a mobile internet device (MID), a wearable device, or an in-vehicle device (VUE), a pedestrian terminal (PUE), etc. The wearable device may include a wristband, earphones, glasses, etc. It should be noted that in the embodiments of the present application, the specific type of the terminal 11 is not limited. The network-side device 12 may be a base station or a core network. Among them, the base station is 、 emission a deployed Node B, an access point, a base transceiver station (BTS), a radio base station, a radio transceiver, a basic service set (BSS), an extended service set (ESS), a B node, an evolved B node (eNB), a home B node, a home evolved B node, a WLAN access point, a WiFi node, a transmission and reception point ( Transmission Reception Point, TRP) or any other suitable term in the field may be used. As long as the same technical effect can be achieved, the base station is not limited to a specific technical term. It should be noted that in the embodiments of the present application, only the base station in the NR system is taken as an example, but the specific type of the base station is not limited.

[0021] With reference to the drawings below, the method for transmitting a radar communication integrated signal provided in the embodiments of the present application will be described in detail by way of specific embodiments and their application scenarios.

[0022] The method of the embodiments of the present application is applied to a communication device, and the communication device may be a user device. The user device may be an access terminal, a user unit, a user station, a mobile station, a mobile phone, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user device. The terminal device may further be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) base station, a PDA, a handheld device with wireless communication capabilities, a computing device, or other processing devices connected to a wireless modem, an in-vehicle device, or a wearable device. The communication device may further be a network-side device such as a base station or a core network.

[0023] As shown in Figure 2, the method for transmitting a radar communication integrated signal according to the embodiments of the present application is executed by a first communication device and includes the following steps 201 and 202.

[0024] In step 201, based on the communication information bits to be transmitted, the polarization state of the first signal is determined.

[0025] Here, the communication information bits to be transmitted are obtained from the communication information to be transmitted. For example, the communication information bits to be transmitted are 0 or 1, or the communication information bits to be transmitted are 00, 01, 10, or 11, etc.

[0026] In this step, the first communication device determines the polarization state of the first signal based on the communication information bits to be transmitted and executes the next step.

[0027] In step 202, based on the polarization state of the first signal, the first signal is transmitted. Here, the first signal is a radar signal.

[0028] In this step, based on the polarization state of the first signal identified in step 201, the first signal is transmitted. Since the first signal is a radar signal and its polarization state is identified based on the communication information bits to be transmitted, communication information can be included in the polarization state of the radar signal, so that radar detection can be performed on the target and the communication information can be transmitted.

[0029] Thus, the method of the embodiment of the present application identifies the polarization state of the first signal based on the communication information bits to be transmitted, and further transmits the first signal based on the identified polarization state of the first signal, so that the integrated transmission of the radar signal and the communication signal is realized, and radar detection can be performed on the target and the communication information can be transmitted. In addition, radar detection is usually in a line-of-sight (LoS) scenario, with little polarization cancellation effect of the channel, which contributes to polarization demodulation at the receiving end.

[0030] Optionally, in this embodiment, step 201 includes identifying the polarization state of the first signal based on the relationship between the communication information bits to be transmitted and the polarization state.

[0031] Here, in order to identify the polarization state of the radar signal corresponding to the communication information bits to be transmitted according to the relationship, the relationship between the communication information bits and the polarization state is preset.

[0032] Regarding the polarization modulation of the radar signal, the polarization modulation order is associated with the number of information bits included in a single polarization modulation symbol, and the higher the polarization modulation order, the more the number of information bits included in a single polarization modulation symbol accordingly. Therefore, various relationships between the communication information bits and the polarization state are preset to apply different polarization modulation orders.

[0033] Thus, selectively, in this embodiment, according to different polarization modulation orders, the relationship between the communication information bits to be transmitted and the polarization state is different, and the polarization modulation order is associated with the number of information bits included in a single polarization modulation symbol.

[0034] Accordingly, as shown in FIG. 3, before the step of specifying the polarization state of the first signal based on the relationship between the communication information bits to be transmitted and the polarization state, the following steps 301 to 304 are further included.

[0035] In step 301, a second signal which is a radar echo signal is received.

[0036] Here, the radar echo signal is a signal returned by the radar signal which is the first signal after detecting a target.

[0037] In step 302, detection is performed based on the second signal, and a detection result is obtained.

[0038] In this step, detection is performed based on the second signal received in step 301, and a detection result is generated. Here, the detection is performed with preset radar detection parameters. Optionally, the radar detection parameters include, but are not limited to, distance, Doppler, angle, resolution, coverage, detection probability, etc. The radar detection parameters may be adjusted according to the current scenario.

[0039] In step 303, based on the detection result, the current polarization modulation order is specified.

[0040] In this step, after the detection result is obtained in step 302, the currently applied polarization modulation order is specified based on the detection result. For example, the polarization modulation order is specified with parameters such as distance and Doppler.

[0041] In step 304, based on the current polarization modulation order, the relationship between the communication information bits to be transmitted and the polarization state is specified.

[0042] As can be seen from the above content, the relationship between the communication information bits corresponding to different polarization modulation orders and the polarization states is preset. Here, in step 303, the current polarization modulation order is identified, and from the current polarization modulation order, the relationship between the communication information bits to be transmitted and the polarization states can be identified, whereby the polarization state of the first signal can be more accurately identified based on the relationship subsequently.

[0043] Here, step 302 includes the step of performing polarization characteristic detection based on the polarization state and the second signal to obtain a detection result.

[0044] That is, for scenarios that require polarization characteristic detection, the radar detection parameters include parameters related to polarization characteristics, the polarization characteristic detection is performed based on the polarization state and the second signal, and a desired detection result is obtained. Naturally, the detection result can indicate the current polarization characteristics.

[0045] It should be understood that in the first communication device, since the detection by the second signal is performed by the radar signal processing unit, if polarization characteristic detection is to be performed, the radar signal processing unit also needs to grasp the current polarization state.

[0046] Optionally, step 202 includes the step of transmitting the first signal through the antenna corresponding to the polarization state.

[0047] Here, the antenna is the polarization antenna of the first communication device. Therefore, radar signals are transmitted through different orthogonal polarization antennas based on the communication information bits to realize modulation such as binary phase shift keying (BPSK) modulation.

[0048] Optionally, the step of transmitting the first signal through the antenna corresponding to the polarization state includes the method of transmitting the first signal through the first antenna A method of transmitting the first signal via the second antenna, A method of transmitting the first signal via the first antenna and the second antenna, And a method of not transmitting the first signal by the first antenna and the second antenna, including at least one of them, Here, the polarization state corresponding to the first antenna and the polarization state corresponding to the second antenna are orthogonal.

[0049] Optionally, the first antenna is a horizontally polarized antenna, and the second antenna is a vertically polarized antenna, or the first antenna is a left-handed circularly polarized antenna, and the second antenna is a right-handed circularly polarized antenna.

[0050] For example, the transmission antenna array of the first communication device includes at least a pair of dual-polarized antennas. When the dual-polarized antennas are a left-handed circularly polarized antenna and a right-handed circularly polarized antenna, if the communication information bit is 0, a radar signal is transmitted via the left-handed circularly polarized antenna, and if the communication information bit is 1, a radar signal is transmitted via the right-handed circularly polarized antenna. Or, if the communication information bit is 00, a radar signal is transmitted via the left-handed circularly polarized antenna, if the communication information bit is 01, a radar signal is transmitted via the right-handed circularly polarized antenna, if the communication information bit is 10, no radar signal is transmitted, and if the communication information bit is 11, a radar signal is simultaneously transmitted via the right-handed circularly polarized antenna and the left-handed circularly polarized antenna.

[0051] When the dual-polarized antennas are a horizontally polarized antenna and a vertically polarized antenna, if the communication information bit is 0, a radar signal is transmitted via the horizontally polarized antenna, and if the communication information bit is 1, a radar signal is transmitted via the vertically polarized antenna. Or, if the communication information bit is 00, a radar signal is transmitted via the horizontally polarized antenna, if the communication information bit is 01, a radar signal is transmitted via the vertically polarized antenna, if the communication information bit is 10, no radar signal is transmitted, and if the communication information bit is 11, a radar signal is simultaneously transmitted via the horizontally polarized antenna and the vertical polarization.

[0052] Also, in this embodiment, optionally, the transmission probability of 00 bits may be reduced by some coding methods to reduce the impact on radar performance.

[0053] Also, optionally, based on the polarization state of the first signal, the step of transmitting the first signal includes: identifying an amplitude ratio and a phase difference corresponding to the polarization state; dividing the first signal into two signal components by a power splitting network based on the identified amplitude ratio; setting the phases of the two signal components by a phase shift network based on the identified phase difference.

[0054] Here, the polarization state of the radar signal is controlled by the power splitting network and the phase shift network to transmit the first signal. That is, based on the communication information bits, the polarization phase descriptor (amplitude δ and phase φ) of the radar signal is changed by the power splitting network and the phase shift network to control the polarization state of the radar signal and realize polarization modulation. Here, each polarization state corresponds to one point in the signal point layout diagram. According to the relationship between the Jones vector and the Poincare sphere, the signal point layout diagram may be displayed on the Poincare sphere.

[0055] Here, the amplitude ratio and the phase difference corresponding to each polarization state may also be preset. When the polarization state of the first signal is identified, the corresponding amplitude ratio and phase difference can be identified. Next, after the polarization state of the first signal is controlled by the power splitting network and the phase shift network, the first signal is transmitted through at least a pair of dual-polarization antennas included in the first communication device.

[0056] As shown in FIG. 4, the transfer function of the power splitting network is represented as JPEG0007717812000001.jpg1421, and by changing the amplitude ratio control parameter δ i the radar signal S iThe amplitude ratio of the two signal components can be controlled. The transfer function of the phase shift network is represented by JPEG0007717812000002.jpg1323, and by changing the phase difference control parameter φ i , the phase difference between the two signal components of the radar signal S i can be controlled. Thus, the radar signal (first signal) S i after passing through the power splitting network becomes the first signal component S i sinδ i and the second signal component S i cosδ i . The first signal component becomes S i sinδ i e jφi after passing through the phase shift network, and is transmitted through the first polarization antenna of the dual-polarization antenna. The second signal component becomes S i cosδ i after passing through the phase shift network, and is transmitted through the second polarization antenna of the dual-polarization antenna. Here, the first polarization antenna can be one or more antennas, and the second polarization antenna can also be one or more antennas.

[0057] Optionally, in this embodiment, step 202 includes the step of transmitting the first signal based on the first time unit, where the first time unit is the minimum duration for which the first communication device performs polarization modulation on the first signal.

[0058] Accordingly, the second communication device, as the communication receiving end of the first communication device, receives the first signal based on the first time unit. The second communication device can detect the information transmitted from the transmitting end only after specifying the first time unit. The first time unit is also the minimum time unit for which the second communication device performs polarization information detection. For example, the first time unit is 1 ms or one slot.

[0059] Optionally, the first time unit is predefined.

[0060] When the first time unit is defined by a protocol, the second communication device may obtain the predefined first time unit by identifying the first time unit.

[0061] Considering situations where the second communication device cannot grasp the predefined first time unit or the first time unit is not predefined, etc., optionally, in this embodiment, the method further includes: sending a notification message for instructing the first time unit.

[0062] In this way, the second communication device can receive the notification message and identify the first time unit.

[0063] Naturally, the second communication device further identifies the first time unit by blind detection. Specifically, there are multiple predefined first time units or first time units indicated by a notification message. For example, the first time unit is 1 ms or 2 ms, and the second communication device identifies the value of the first time unit as 1 ms or 2 ms by blind detection.

[0064] Optionally, the step of transmitting the first signal based on the first time unit includes: repeatedly transmitting the first signal with the first time unit as a basic unit, or after adjusting the first time unit to a second time unit according to an adjustment parameter, transmitting the first signal within the second time unit.

[0065] Here, when the first communication device repeatedly transmits the first signal with the first time unit as a basic unit, the first communication device further notifies the second communication device of the number of repetitions N, where N is a natural number greater than or equal to 1. The second communication device identifies the first time unit and N, and then detects the information transmitted from the first communication device.

[0066] The adjustment parameter may be predefined. However, considering its application to scenarios, optionally, the adjustment parameter is determined by the detection result of detecting the radar echo signal.

[0067] Since the first communication device can adjust the first time unit based on the detection result of detecting the radar echo signal, the adjusted second time unit has higher applicability to the scenario.

[0068] Similarly, N may be predefined or can be dynamically adjusted based on the detection result of detecting the radar echo signal.

[0069] For example, the farther the distance, the longer the first time unit or the larger N, so that the second communication device can perform signal accumulation and synthesis first and then perform polarization state detection to obtain diversity / synthesis gain and increase the detection signal-to-noise ratio.

[0070] For example, the radar signal is a pulse radar signal, the pulse radar signal can emit short high-frequency pulses, and the antenna is relayed and connected to the receiver to receive the signal, so the signal transmission and reception are separated in time, and its polarization modulation scheme is as shown in FIG. 5. Here, the Pulse Repetition Interval (PRI) can be used to represent the speed of radar pulse transmission, and Tmin is the minimum time interval (the first time unit) in the polarization modulation scheme. When transmitting a radar communication integrated signal based on the pulse signal, at least one radar pulse signal exists within each Tmin. As described above, in order to increase the detection signal-to-noise ratio, Tmin can be increased, that is, the transmission speed of communication information can be decreased, so that at least a plurality of radar pulse signals exist within each Tmin, or communication information can be repeatedly transmitted at Tmin. That is, a plurality of consecutive Tmins correspond to the same polarization state, that is, the same communication information bit.

[0071] Alternatively, the radar signal is a continuous wave radar signal, which may be a single frequency continuous wave (CW) or a frequency modulated continuous wave (FMCW). Taking FMCW as an example, its polarization modulation scheme is as shown in FIG. 6, where T is the FMCW sweep period and Tmin is the minimum time interval (the first time unit) in the polarization modulation scheme. Preferably, the polarization state is switched at the start or end of each FMCW sweep period. That is, the polarization state is kept unchanged within each FMCW sweep period and corresponds to the same communication information bit. As described above, in order to increase the detection signal-to-noise ratio, Tmin can be increased, that is, the transmission speed of the communication information can be decreased, so that at least a plurality of sweep periods T are included within each Tmin, or the communication information can be repeatedly transmitted at Tmin. That is, a plurality of consecutive Tmins correspond to the same polarization state, that is, the same communication information bit. Optionally, when the FMCW sweep period is constant, in order to further increase the communication speed, Tmin can be decreased so that the radar signal within one sweep period T corresponds to a plurality of polarization states, that is, different communication information bits.

[0072] It should be noted that in this embodiment, the first communication device may be the transmission end of the first signal and may also be the reception end of the first signal transmitted from the third communication device, and detailed description thereof is omitted here.

[0073] In the following, as shown in FIG. 7, the transmission and reception of the first signal will be described in association with the structure of the first communication device that executes the method for transmitting an integrated radar communication signal according to the embodiment of the present application.

[0074] Here, the baseband processing part is divided into a radar baseband processing unit and a communication baseband processing unit. Among them, the radar baseband processing unit is for generating a radar signal that can be a pulse signal or a continuous wave signal. The communication baseband processing unit is for generating communication information (communication source information) to obtain communication information bits. Optionally, the communication baseband processing unit can further perform scrambling and encoding.

[0075] The polarization state processing unit is for specifying the polarization state based on the communication information bits.

[0076] The transmission front end and the transmission antenna array are shared by the communication system and the radar system, and are for performing digital-to-analog conversion, up-conversion of the radar signal, polarization modulation of the radar signal by the communication information bits, and transmission of the combined signal. The transmission antenna array includes at least a pair of dual-polarization antennas that can be a left-handed circular polarization antenna and a right-handed circular polarization antenna, or a horizontal polarization antenna and a vertical polarization antenna.

[0077] The reception front end and the reception antenna array are shared by the communication system and the radar system, and are for performing down-conversion, analog-to-digital conversion, amplitude and phase calibration of the radar signal and / or the communication signal. The reception antenna array includes at least a pair of dual-polarization antennas that can be, for example, a left-handed circular polarization antenna and a right-handed circular polarization antenna, or a horizontal polarization antenna and a vertical polarization antenna.

[0078] The radar signal processing unit performs analysis and detection of the radar echo signal to obtain corresponding radar detection parameters, such as distance, Doppler, angle, resolution, coverage, detection probability, etc., and / or performs polarization characteristic analysis on the radar echo signal based on the communication information bits at the transmission end.

[0079] The communication signal processing unit performs decoding and determination of the communication signal and performs polarization demodulation on the communication signal.

[0080] In summary, the method of the embodiment of the present application specifies the polarization state of the first signal based on the communication information bits to be transmitted, and further transmits the first signal based on the specified polarization state of the first signal, thereby realizing the integrated transmission of the radar signal and the communication signal, enabling radar detection of the target and transmission of communication information, and the radar detection is usually in the line-of-sight (LoS) scenario, with little polarization cancellation effect of the channel, contributing to polarization demodulation at the receiving end.

[0081] As shown in FIG. 8, the method for receiving the integrated radar communication signal according to the embodiment of the present application is executed by a second communication device. It includes step 801 of receiving the first signal transmitted from the first communication device. Here, the first signal is a radar signal, and the polarization state of the first signal is specified by the first communication device based on the communication information bits to be transmitted.

[0082] Since the first signal is a radar signal and the polarization state of the first signal is specified by the first communication device based on the communication information bits to be transmitted, by receiving the first signal, the integrated transmission of the radar signal and the communication signal is realized, enabling radar detection of the target and transmission of communication information, and the radar detection is usually in the line-of-sight (LoS) scenario, with little polarization cancellation effect of the channel, contributing to polarization demodulation at the receiving end.

[0083] Optionally, before step 801, It further includes the step of specifying a first time unit. The step of receiving the first signal transmitted from the first communication device includes the step of receiving the first signal based on the first time unit. Here, the first time unit is the minimum duration for which the first communication device performs polarization modulation on the first signal.

[0084] Optionally, the step of specifying the first time unit is A method of receiving a notification message for instructing the first time unit, which is transmitted from the first communication device; A method of obtaining the predefined first time unit; And includes at least one of a method of identifying the first time unit by blind detection.

[0085] Optionally, after the step of receiving the first signal transmitted from the first communication device, The method further includes a step of performing polarization demodulation on the first signal.

[0086] Specifically, regarding transmitting the first signal via the antenna corresponding to the polarization state, the second communication device may adopt non-coherent demodulation and directly measure the received power of different orthogonal polarization antennas. For example, when adopting a left-handed circular polarization antenna and a right-handed circular polarization antenna, if the received power at the left-handed circular polarization antenna of the second communication device increases, it is recognized that the communication information bit transmitted from the transmitting end is 0. If the received power at the right-handed circular polarization antenna of the second communication device increases, it is recognized that the communication information bit transmitted from the transmitting end is 1. When adopting a horizontal polarization antenna and a vertical polarization antenna, if the received power at the horizontal polarization antenna of the second communication device increases, it is recognized that the communication information bit transmitted from the transmitting end is 0. If the received power at the vertical polarization antenna of the second communication device increases, it is recognized that the communication information bit transmitted from the transmitting end is 1. Or, for example, when adopting a left-handed circular polarization antenna and a right-handed circular polarization antenna, if the received power at the left-handed circular polarization antenna of the second communication device increases, it is recognized that the communication information bit transmitted from the transmitting end is 00. If the received power at the right-handed circular polarization antenna of the second communication device increases, it is recognized that the communication information bit transmitted from the transmitting end is 01. When the received powers at both the left-handed and right-handed circular polarization antennas are low, for example, lower than a certain threshold, it is recognized that the communication information bit transmitted from the transmitting end is 10. When the received powers at both the left-handed and right-handed circular polarization antennas are high, for example, higher than a certain threshold, it is recognized that the communication information bit transmitted from the transmitting end is 11. When adopting a horizontal polarization antenna and a vertical polarization antenna, if the received power at the horizontal polarization antenna of the second communication device increases, it is recognized that the communication information bit transmitted from the transmitting end is 00. If the received power at the vertical polarization antenna of the second communication device increases, it is recognized that the communication information bit transmitted from the transmitting end is 01. When the received powers at both the horizontal and vertical polarization antennas are low, for example, lower than a certain threshold, it is recognized that the communication information bit transmitted from the transmitting end is 10. When the received powers at both the horizontal and vertical antennas are high, for example, higher than a certain threshold, it is recognized that the communication information bit transmitted from the transmitting end is 11.Regarding controlling the polarization state of a radar signal by means of a power splitting network and a phase shift network to transmit a first signal, the second communication device may adopt a method of extracting Stokes parameters to obtain the Stokes vector of the radar signal. The first communication device controls the polarization phase descriptor of the radar signal, that is, the Jones vector of the radar signal, to obtain different polarization states corresponding to different signal points in modulation such as M-Quadrature Amplitude Modulation (MQAM). After the second communication device obtains the Stokes vector of the radar signal, from the one-to-one mapping relationship between the Stokes vector and the Jones vector, it can grasp the polarization state in which the transmitting end transmits the radar signal and complete polarization demodulation.

[0087] In this embodiment, the second communication device may be the receiving end of the first signal and may also be the transmitting end of the first signal received by the fourth communication device. Detailed description is omitted here.

[0088] It should be noted that this method is realized in combination with the above-mentioned method for transmitting an integrated radar communication signal. The embodiments of the above-mentioned method for transmitting an integrated radar communication signal are applicable to this method, and the same technical effects can be achieved.

[0089] It should be noted that the method provided in the embodiments of this application may be an apparatus or a control module for mounting and executing the method in the apparatus. In the embodiments of this application, the method mounted and executed by the apparatus is taken as an example to describe the method for transmitting or receiving an integrated radar communication signal provided in the embodiments of this application.

[0090] As shown in FIG. 9, the communication device according to the embodiment of this application includes a first specifying module 910 for specifying the polarization state of the first signal based on the communication information bits to be transmitted, and a transmitting module 920 for transmitting the first signal based on the polarization state of the first signal. Here, the first signal is a radar signal.

[0091] Optionally, the first specific module further is for specifying the polarization state of the first signal based on the correlation between the communication information bits to be transmitted and the polarization state.

[0092] Optionally, according to different polarization modulation orders, the correlation between the communication information bits to be transmitted and the polarization state is different, and the polarization modulation order is associated with the number of information bits included in a single polarization modulation symbol. The device further includes a receiving module for receiving a second signal that is a radar echo signal, a detecting module for performing detection based on the second signal to obtain a detection result, a first processing module for specifying the current polarization modulation order based on the detection result, and a second processing module for specifying the correlation between the communication information bits and the polarization state based on the current polarization modulation order.

[0093] Optionally, the detecting module includes performing polarization characteristic detection based on the polarization state and the second signal to obtain a detection result.

[0094] Optionally, the transmitting module includes a first transmission sub-module for transmitting the first signal via an antenna corresponding to the polarization state.

[0095] Optionally, the first transmission sub-module transmits the first signal in at least one of the following ways: transmitting the first signal via a first antenna, transmitting the first signal via a second antenna, transmitting the first signal via the first antenna and the second antenna, and not transmitting the first signal via the first antenna and the second antenna. Here, the polarization state corresponding to the first antenna and the polarization state corresponding to the second antenna are orthogonal.

[0096] Optionally, the first antenna is a horizontally polarized antenna and the second antenna is a vertically polarized antenna, or the first antenna is a left-handed circularly polarized antenna and the second antenna is a right-handed circularly polarized antenna.

[0097] Optionally, the transmission module includes a specifying sub-module for specifying the amplitude ratio and phase difference corresponding to the polarization state, a first processing sub-module for dividing the first signal into two signal components by a power splitting network based on the specified amplitude ratio, and a second processing sub-module for setting the phases of the two signal components by a phase shift network based on the specified phase difference.

[0098] Optionally, the transmission module further is for transmitting the first signal based on a first time unit, where the first time unit is the minimum duration for which the first communication device performs polarization modulation on the first signal.

[0099] Optionally, the first time unit is predefined.

[0100] Optionally, the device further includes a notification module for transmitting a notification message for instructing the first time unit.

[0101] Optionally, the transmission module further repeatedly transmits the first signal using the first time unit as a basic unit, or is for transmitting the first signal within a second time unit after adjusting the first time unit to the second time unit according to an adjustment parameter.

[0102] Optionally, the adjustment parameter is specified according to the detection result of detecting the radar echo signal.

[0103] The communication device identifies the polarization state of the first signal based on the communication information bits to be transmitted, and further transmits the first signal based on the identified polarization state of the first signal, thereby realizing integrated transmission of the radar signal and the communication signal, performing radar detection on the target and transmitting communication information, and the radar detection is usually in a line-of-sight (LoS) scenario, with little polarization cancellation effect of the channel, contributing to polarization demodulation at the receiving end.

[0104] The communication device in the embodiment of the present application may be a terminal such as a portable electronic device or a non-portable electronic device. Exemplarily, the portable electronic device may be a mobile phone, a tablet computer, a notebook computer, a personal digital assistant, an in-vehicle electronic device, a wearable device, a UMPC, a netbook, or a PDA, etc., and the non-portable electronic device may be a server, a network attached storage (NAS), a personal computer (PC), a television (TV), a cash dispenser, or a kiosk, etc., which is not specifically limited in the embodiment of the present application. Of course, it may also be a network-side device.

[0105] The communication device in the embodiment of the present application may be a device having an operating system. The operating system may be an Android operating system, an iOS operating system, or other possible operating systems, which is not specifically limited in the embodiment of the present application.

[0106] The communication device provided in the embodiment of the present application can realize each process realized by the first communication device in the method embodiments from FIG. 2 to FIG. 7. For the sake of avoiding repetition, detailed description is omitted here.

[0107] As shown in FIG. 10, the communication device according to the embodiment of the present application includes a receiving module 1010 for receiving a first signal transmitted from a first communication device, wherein the first signal is a radar signal, and the polarization state of the first signal is determined by the first communication device based on communication information bits to be transmitted.

[0108] Optionally, the device further includes a second specifying module for specifying a first time unit, wherein the receiving module is further configured to receive the first signal based on the first time unit, wherein the first time unit is the minimum duration for which the first communication device performs polarization modulation on the first signal.

[0109] Optionally, the second specifying module specifies the first time unit by at least one of receiving a notification message transmitted from the first communication device for instructing the first time unit, acquiring the predefined first time unit, and specifying the first time unit by blind detection.

[0110] Optionally, the device further includes a demodulation module for performing polarization demodulation on the first signal.

[0111] Since the first signal is a radar signal and the polarization state of the first signal is determined by the first communication device based on communication information bits to be transmitted, the communication device can receive the first signal to realize integrated transmission of the radar signal and the communication signal, perform radar detection on a target and transmit communication information, and the radar detection is usually in a line-of-sight (LoS) scenario with little polarization cancellation effect of the channel, contributing to polarization demodulation at the receiving end.

[0112] The communication device in the embodiment of the present application may be a terminal such as a portable electronic device or a non-portable electronic device. Exemplarily, the portable electronic device may be a mobile phone, a tablet computer, a notebook computer, a personal digital assistant, an in-vehicle electronic device, a wearable device, a UMPC, a netbook, or a PDA, etc., and the non-portable electronic device may be a server, a network attached storage (NAS), a personal computer (PC), a television (TV), a cash dispenser, or a kiosk, etc. The embodiment of the present application is not specifically limited. Of course, it may also be a network-side device.

[0113] The communication device in the embodiment of the present application may be a device having an operating system. The operating system may be an Android operating system, an iOS operating system, or other possible operating systems, and the embodiment of the present application is not specifically limited.

[0114] The communication device provided in the embodiment of the present application can implement each process realized by the second communication device in the embodiment of the method in FIG. 8. To avoid duplication, the detailed description is omitted here.

[0115] Optionally, as shown in FIG. 11, an embodiment of the present application further provides a communication device including a processor 1101, a memory 1102, and a program or command stored in the memory 1102 and executable on the processor 1101. For example, when the communication device 1100 is a terminal, when the program or command is executed by the processor 1101, each process of the embodiment of the above method for transmitting a radar communication integrated signal or the method for receiving a radar communication integrated signal can be realized, and the same technical effect can be achieved. When the communication device 1100 is a first communication device, when the program or command is executed by the processor 1101, each process of the embodiment of the above method for transmitting a radar communication integrated signal can be realized, and the same technical effect can be achieved. To avoid repetition, detailed description is omitted here. When the communication device 1100 is a second communication device, when the program or command is executed by the processor 1101, each process of the embodiment of the above method for receiving a radar communication integrated signal can be realized, and the same technical effect can be achieved. To avoid repetition, detailed description is omitted here.

[0116] FIG. 12 is a schematic diagram of the hardware structure of a terminal as a communication device for implementing each embodiment of the present application.

[0117] The terminal 1200 includes components such as, but not limited to, a high-frequency unit 1201, a network module 1202, an audio output unit 1203, an input unit 1204, a sensor 1205, a display unit 1206, a user input unit 1207, an interface unit 1208, a memory 1209, and a processor 1210.

[0118] A person skilled in the art would understand that the terminal 1200 may further include a power source (such as a battery) for supplying power to each component. The power source is logically connected to the processor 1210 by a power management system, and the power management system can further implement functions such as charge and discharge management and power consumption management. It is understandable that the structure of the terminal shown in FIG. 12 does not limit the terminal. The terminal may include more or fewer components than shown, or a combination of some components, or different component arrangements, and detailed descriptions are omitted here.

[0119] In the embodiments of the present application, it should be understood that the input unit 1204 may include a graphics processing unit (GPU) 12041 that processes still image or video image data acquired by an image acquisition device (such as a camera) in a video acquisition mode or an image acquisition mode, and a microphone 12042. The display unit 1206 may include a display panel 12061, and the display panel 12061 may be arranged in the form of a liquid crystal display, an organic light-emitting diode, etc. The user input unit 1207 includes a touch panel 12071 and other input devices 12072. The touch panel 12071 is also called a touch screen. The touch panel 12071 may include two parts: a touch detection device and a touch controller. The other input devices 12072 may include a physical keyboard, function buttons (such as volume control buttons, switch buttons, etc.), a trackball, a mouse, an operation lever, but are not limited thereto, and detailed descriptions are omitted here.

[0120] In the embodiments of the present application, after receiving downlink data from a network-side device, the high-frequency unit 1201 processes it with the processor 1210 and also transmits uplink data to the network-side device. Usually, the high-frequency unit 1201 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, etc.

[0121] Memory 1209 can be used to store software programs or commands and various data. Memory 1209 may mainly include a program or command storage area capable of storing an operating system, application programs or commands required for at least one function (such as a voice playback function, an image playback function, etc.), and a data storage area. Further, Memory 1209 may include a high-speed random access memory or a non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable programmable ROM (EEPROM), or a flash memory. For example, at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices may be mentioned.

[0122] Processor 1210 may include one or more processing units. Optionally, the Processor 1210 can integrate an application processor mainly processing an operating system, a user interface, application programs or commands, etc., and a modem processor mainly processing wireless communication such as a baseband processor. It can be understood that the above modem processor may not be integrated into the Processor 1210.

[0123] Here, the Processor 1210 is used for the steps of identifying the polarization state of the first signal based on the communication information bits to be transmitted, and transmitting the first signal based on the polarization state of the first signal, and the first signal is a radar signal.

[0124] The terminal realizes integrated transmission of radar signals and communication signals, can perform radar detection on a target and transmit communication information, and the radar detection is usually in a line-of-sight (LoS) scenario, with little polarization cancellation effect of the channel, contributing to polarization demodulation at the receiving end.

[0125] Specifically, the embodiments of the present application further provide a network-side device as a communication device. As shown in FIG. 13, the network device 1300 includes an antenna 1301, a high-frequency device 1302, and a baseband device 1303. The antenna 1301 is connected to the high-frequency device 1302. In the uplink direction, the high-frequency device 1302 receives information via the antenna 1301 and transmits the received information to the baseband device 1303 for processing. In the downlink direction, the baseband device 1303 processes the information to be transmitted, and transmits it to the high-frequency device 1302. The high-frequency device 1302 processes the received information and then transmits it via the antenna 1301.

[0126] The above frequency band processing device may be in the baseband device 1303. The method executed by the network-side device in the above embodiments can be realized by the baseband device 1303. The baseband device 1303 includes a processor 1304 and a memory 1305.

[0127] The baseband device 1303 may include, for example, at least one baseband board with a plurality of chips installed. As shown in FIG. 13, one of the chips is, for example, a processor 1304 connected to the memory 1305 to call a program in the memory 1305 to execute the operations of the network device shown in the embodiments of the above method.

[0128] The baseband device 1303 may further include a network interface 1306 for exchanging information with the high-frequency device 1302. The interface is, for example, a Common Public Radio Interface (CPRI).

[0129] Specifically, the network-side device of the embodiment of the present application further includes commands or programs stored in the memory 1305 and executable on the processor 1304. The processor 1304 calls the commands or programs in the memory 1305 to execute the methods executed by each module, achieving the same technical effect. To avoid duplication, detailed descriptions are omitted here.

[0130] The embodiment of the present application further provides a readable storage medium, in which a program or command is stored. When the program or command is executed by a processor, each process of the embodiment of the method for transmitting the radar communication integrated signal or the method for receiving the radar communication integrated signal is realized, and the same technical effect can be achieved. To avoid duplication, detailed descriptions are omitted here.

[0131] Here, the processor is the processor in the communication device described in the above embodiment. The readable storage medium includes computer-readable storage media such as, for example, a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0132] The embodiment of the present application further provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor executes a program or command to realize each process of the embodiment of the method for transmitting the radar communication integrated signal or the method for receiving the radar communication integrated signal, and the same technical effect can be achieved. To avoid duplication, detailed descriptions are omitted here.

[0133] It should be understood that the chip mentioned in the embodiment of the present application may also be referred to as a system-level chip, a system chip, a chip system, or a system-on-chip, etc.

[0134] Embodiments of the present application further provide a computer program product, where the computer program product is stored in a non-volatile storage medium, and the computer program product realizes the steps of the embodiments of the method for transmitting a radar communication integrated signal or the method for receiving a radar communication integrated signal when executed by at least one processor, and can achieve the same technical effects. To avoid duplication, detailed descriptions are omitted here.

[0135] It should be noted that in this specification, the terms "including", "consisting of" or any other variations are intended to include non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements but also other elements not explicitly stated or elements inherent in such a process, method, article or device. Unless otherwise specified, the element limited by the phrase "including one..." does not exclude the further existence of another same element in the process, method, article or device including the element. It should also be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to executing functions in the order shown or considered, and may also include executing functions substantially simultaneously or in the reverse order according to such functions. For example, the described method may be executed in an order different from that described, and various steps may be added, omitted, or combined. In addition, the features described with reference to any examples may be combined in other examples.

[0136] From the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above examples can be implemented in the form of a combination of software and the necessary common hardware platforms. Naturally, they can also be implemented by hardware, but in many cases, the former is a more preferred embodiment. Based on such an understanding, the technical solution of this application or the part that contributes to the prior art can be implemented in the form of a software product. The computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a plurality of commands for causing a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of this application.

[0137] It should be noted that those skilled in the art can conceive that each unit and algorithm step described by the examples described by the embodiments disclosed in this specification can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether to execute these functions in the form of hardware or in the form of software is determined by the specific use and design constraints of the technical solution. A person skilled in the art can realize the described functions in different ways for each specific use, but such realization should not be understood as exceeding the scope of this disclosure.

[0138] Those skilled in the art can clearly understand that for the sake of simplifying and streamlining the description, the specific operation processes of the above-described systems, devices, and units can refer to the corresponding processes in the embodiments of the above methods, and detailed descriptions are omitted here.

[0139] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other forms. For example, the device embodiments described above are merely illustrative. For example, the division of the above-mentioned units is only a division of logical functions. When actually implemented, it may be divided in other forms. For example, a plurality of units or components may be combined, integrated into another system, or some features may be omitted or not executed. Also, the couplings, direct couplings, or communication connections illustrated or described with respect to each other may be indirect couplings or communication connections through some interfaces, devices, or units, and may be in electrical, mechanical, or other forms.

[0140] The units described as separation members may or may not be physically separated. The members shown as units may or may not be physical units. They may be located in one place or distributed among a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution means of this embodiment.

[0141] Also, each functional unit in each embodiment of the present disclosure may be integrated into one processing unit, may exist independently physically, or may be integrated into one unit by two or more.

[0142] As described above, the embodiments of the present application have been described with reference to the drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Based on the suggestions of the present application, many forms that those skilled in the art can make without departing from the spirit of the present application and the protection scope of the claims all belong to the protection scope of the present application.

Claims

1. A method for transmitting a radar communication integrated signal executed by a first communication device, comprising: identifying a polarization state of a first signal based on communication information bits to be transmitted; transmitting the first signal based on the polarization state of the first signal, wherein the first signal is a radar signal, the step of identifying the polarization state of the first signal based on the communication information bits to be transmitted includes: identifying the polarization state of the first signal based on a correlation between the communication information bits to be transmitted and the polarization state; the correlation between the communication information bits to be transmitted and the polarization state is different according to different polarization modulation orders, and the polarization modulation order is associated with the number of information bits included in a single polarization modulation symbol; before the step of identifying the polarization state of the first signal based on the correlation between the communication information bits to be transmitted and the polarization state, receiving a second signal that is a radar echo signal; detecting based on the second signal to obtain a detection result; identifying a current polarization modulation order based on the detection result; further comprising identifying the correlation between the communication information bits to be transmitted and the polarization state based on the current polarization modulation order. A transmission method.

2. The step of detecting based on the second signal to obtain a detection result includes: performing polarization characteristic detection based on the polarization state and the second signal to obtain a detection result, according to the transmission method described in Claim 1.

3. The step of transmitting the first signal based on the polarization state of the first signal includes: transmitting the first signal through an antenna corresponding to the polarization state, or the step of transmitting the first signal based on the polarization state of the first signal includes: identifying an amplitude ratio and a phase difference corresponding to the polarization state; dividing the first signal into two signal components by a power splitting network based on the identified amplitude ratio; setting the phases of the two signal components by a phase shift network based on the identified phase difference, according to the transmission method described in Claim 1.

4. The step of transmitting the first signal through an antenna corresponding to the polarization state includes: a method of transmitting the first signal through a first antenna; a method of transmitting the first signal through a second antenna; A method of transmitting the first signal via the first antenna and the second antenna; including at least one of a method of not transmitting the first signal by the first antenna and the second antenna; The transmission method according to claim 3, wherein a polarization state corresponding to the first antenna and a polarization state corresponding to the second antenna are orthogonal.

5. The first antenna is a horizontally polarized antenna, and the second antenna is a vertically polarized antenna, or the first antenna is a left-handed circularly polarized antenna, and the second antenna is a right-handed circularly polarized antenna, The transmission method according to claim 4.

6. Based on the polarization state of the first signal, the step of transmitting the first signal includes a step of transmitting the first signal based on a first time unit, The transmission method according to claim 1, wherein the first time unit is a minimum duration for which the first communication device performs polarization modulation on the first signal.

7. The first time unit is predefined, or further includes a step of transmitting a notification message for instructing the first time unit, or The step of transmitting the first signal based on a first time unit includes a step of repeatedly transmitting the first signal with the first time unit as a basic unit, or includes a step of adjusting the first time unit to a second time unit according to an adjustment parameter and then transmitting the first signal within the second time unit. The transmission method according to claim 6.

8. A method for receiving a radar communication integrated signal executed by a second communication device, including a step of receiving a first signal transmitted from a first communication device, the first signal is a radar signal, and a polarization state of the first signal is specified by the first communication device based on communication information bits to be transmitted, before the step of receiving the first signal transmitted from the first communication device, further includes a step of specifying a first time unit, the step of receiving the first signal transmitted from the first communication device includes a step of receiving the first signal based on the first time unit, the first time unit is a minimum duration for which the first communication device performs polarization modulation on the first signal, the step of specifying the first time unit includes a method of receiving a notification message for instructing the first time unit, transmitted from the first communication device, and a method of obtaining the predefined first time unit. A receiving method including at least one of the method of identifying the first time unit by blind detection.

9. After the step of receiving the first signal transmitted from the first communication device, The receiving method according to claim 8, further comprising the step of performing polarization demodulation on the first signal.

10. A communication device, A first identification module for identifying the polarization state of the first signal based on communication information bits to be transmitted, A transmission module for transmitting the first signal based on the polarization state of the first signal, and The first signal is a radar signal, The first identification module, Is further used to identify the polarization state of the first signal based on the relationship between the communication information bits to be transmitted and the polarization state, According to different polarization modulation orders, the relationship between the communication information bits to be transmitted and the polarization state is different, and the polarization modulation order is associated with the number of information bits included in a single polarization modulation symbol, The communication device, A receiving module for receiving a second signal that is a radar echo signal, A detection module for performing detection based on the second signal to obtain a detection result, A first processing module for identifying the current polarization modulation order based on the detection result, A communication device, further comprising a second processing module for identifying the relationship between the communication information bits to be transmitted and the polarization state based on the current polarization modulation order.

11. A communication device, Including a receiving module for receiving a first signal transmitted from a first communication device, The first signal is a radar signal, and the polarization state of the first signal is identified by the first communication device based on communication information bits to be transmitted, The communication device, Further includes a second identification module for identifying a first time unit, The receiving module, Is further used to receive the first signal based on the first time unit, The first time unit is the minimum duration for which the first communication device performs polarization modulation on the first signal, The second identification module, The method of receiving a notification message transmitted from the first communication device for indicating the first time unit, The method of obtaining the predefined first time unit, A communication device that identifies the first time unit by at least one of the method of identifying the first time unit by blind detection.

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