Sensing target identification method and device, sensing equipment and storage medium

Abstract

The invention discloses a sensing target identification method and device, sensing equipment and a storage medium, and relates to the technical field of communication. According to the implementation scheme, a sensing reference signal is sent to a sensing environment; wherein the comb factor of the sensing reference signal is greater than a set value, an OFDM symbol in the sensing reference signal comprises NS time domain sampling points, and a cyclic prefix in the sensing reference signal comprises NCP time domain sampling points; detecting the sensing environment to obtain a sensing echo signal; wherein the sensing echo signal is a signal reflected by the sensing reference signal through a sensing target in the sensing environment; performing radio frequency preprocessing on the sensing echo signal to obtain a first baseband signal; deleting the foremost # imgabs0 # time domain sample points and the rearmost NCP time domain sample points in the first baseband signal to obtain a second baseband signal; a distance between the sensing target and the sensing device is identified based on the second baseband signal. Therefore, not only can the sensing ranging range be increased, but also the time-frequency resources of the original system can be ensured not to be wasted.

Description

Technical Field

[0001] The present application relates to the field of communication technologies, and in particular, to a method, an apparatus, a sensing device, and a storage medium for identifying a sensing target. Background Art

[0002] In the integrated communication and sensing ranging application of a communication system, the ranging range of a sensing target depends on the CP (Cyclic Prefix) length of the OFDM (Orthogonal Frequency Division Multiplexing) symbol in the sensing reference signal. For example, in the case of a common subcarrier spacing configuration of 30 KHz (kilohertz), the duration of the OFDM symbol is The typical CP length is 2.34 us. In the case of transceiver synchronization, the ranging range of the sensing target is about 350 meters.

[0003] If the ranging range of the sensing target is extended by extending the CP length of the original OFDM symbol. For example, if the configuration of 14 original OFDM symbols within a time slot is reduced, such as reduced to 12 OFDM symbols, the CP length can be extended to about 8.33 us, and the ranging range is extended to 1.25 kilometers.

[0004] However, the above method for extending the ranging range sacrifices the time domain resources of 2 OFDM symbols, resulting in resource waste. Summary of the Invention

[0005] The present application provides a method, an apparatus, a sensing device, and a storage medium for identifying a sensing target.

[0006] According to one aspect of the present application, there is provided a method for identifying a sensing target, which is applied to a sensing device. The method includes: sending a sensing reference signal to a communication and sensing environment; wherein, the comb factor of the sensing reference signal is greater than a set value, the OFDM symbol in the sensing reference signal includes a first number N S of time domain samples, and the cyclic prefix in the sensing reference signal includes a second number N CP of time domain samples; detecting the communication and sensing environment to obtain a sensing echo signal, where the sensing echo signal is a signal reflected by the sensing target in the communication and sensing environment from the sensing reference signal; performing radio frequency preprocessing on the sensing echo signal to obtain a first baseband signal, and deleting the first frontmost and the last N CP time domain samples of the first baseband signal to obtain a second baseband signal; and identifying the distance between the sensing target in the communication and sensing environment and the sensing device based on the second baseband signal.

[0007] As a possible implementation, the sensing reference signal is generated using the following steps: Obtain the comb factor configured for the sensing reference signal; wherein, the comb factor is greater than a set value; Generate a frequency-domain reference sequence according to the frequency spectrum range used by the sensing device, and map the frequency-domain reference sequence to a frequency-domain reference signal according to the comb factor; Generate a time-domain baseband signal according to the frequency-domain reference signal, and add a cyclic prefix to the time-domain baseband signal; wherein, there are N S time-domain samples on the OFDM symbol in the time-domain baseband signal, and there are N CP time-domain samples on the cyclic prefix; Perform upmixing on the time-domain baseband signal after adding the cyclic prefix to obtain the sensing reference signal.

[0008] As a possible implementation, generating a time-domain baseband signal according to the frequency-domain reference signal includes: Increasing the power of the frequency-domain reference signal according to the comb factor to obtain an adjusted frequency-domain reference signal; Performing an IFFT transform on the adjusted frequency-domain reference signal to obtain a time-domain baseband signal.

[0009] As a possible implementation, based on the second baseband signal, identifying the distance between the sensing target and the sensing device in the communication and sensing environment includes: Performing channel estimation on the second baseband signal to obtain a target channel estimation result; Identifying the distance between the sensing target and the sensing device according to the target channel estimation result.

[0010] As a possible implementation, performing channel estimation on the second baseband signal to obtain a target channel estimation result includes: According to Determine the FFT length; According to the FFT length, perform an FFT transform on the second baseband signal to obtain a frequency-domain received signal; Perform frequency-domain channel estimation on the frequency-domain received signal to obtain an intermediate channel estimation result; Perform time-delay domain channel estimation on the intermediate channel estimation result to obtain a target channel estimation result.

[0011] As a possible implementation, the sensing reference signal is generated according to the frequency-domain reference signal, and the frequency-domain reference signal includes multiple frequency-domain samples; Performing frequency-domain channel estimation on the frequency-domain received signal to obtain an intermediate channel estimation result includes: Determining target frequency-domain samples carrying the reference signal from the multiple frequency-domain samples in the frequency-domain reference signal; Performing frequency-domain channel estimation on the frequency-domain received signal according to the conjugate of the sampling values of the target frequency-domain samples in the frequency-domain reference signal to obtain an intermediate channel estimation result.

[0012] As a possible implementation, performing time-delay domain channel estimation on the intermediate channel estimation result to obtain a target channel estimation result includes: Based on the FFT length, performing an IFFT transform on the intermediate channel estimation result to obtain a target channel estimation result.

[0013] As a possible implementation, the target channel estimation result includes multiple time-domain samples; according to the target channel estimation result, identifying the distance between the sensing target and the sensing device includes: determining, from the multiple time-domain samples of the target channel estimation result, the target time-domain samples belonging to the sensing target; determining the time delay of the sensing target according to the arrangement position of the target time-domain samples in the target channel estimation result; and determining the distance between the sensing target and the sensing device according to the time delay of the sensing target.

[0014] As a possible implementation, determining the time delay of the sensing target according to the arrangement position of the target time-domain samples in the target channel estimation result includes: obtaining the subcarrier spacing SCS between multiple subcarriers within the occupied bandwidth of the sensing reference signal; and according to the SCS and N S , determining the intermediate frequency sampling interval; and determining the time delay of the sensing target according to the product of the intermediate frequency sampling interval and the arrangement position.

[0015] As a possible implementation, determining the distance between the sensing target and the sensing device according to the time delay of the sensing target includes: determining the distance between the sensing target and the sensing device according to the product of the speed of light and the time delay.

[0016] According to another aspect of the present application, a sensing device is provided, including a memory, a transceiver, and a processor;

[0017] The memory is used for storing computer programs; the transceiver is used for transceiving data under the control of the processor; the processor is used for reading the computer programs in the memory and performing the following operations: sending a sensing reference signal to the communication and sensing environment; wherein, the comb factor of the sensing reference signal is greater than a set value, the OFDM symbols in the sensing reference signal include a first number N S of time-domain samples, and the cyclic prefix in the sensing reference signal includes a second number N CP of time-domain samples; detecting the communication and sensing environment to obtain a sensing echo signal, where the sensing echo signal is a signal reflected by the sensing reference signal through a sensing target in the communication and sensing environment; performing radio frequency preprocessing on the sensing echo signal to obtain a first baseband signal, and deleting the first frontmost and the last N CP time-domain samples of the first baseband signal to obtain a second baseband signal; and identifying the distance between the sensing target and the sensing device in the communication and sensing environment based on the second baseband signal.

[0018] As a possible implementation, the processor performs the following steps to generate a sensing reference signal: Obtain the comb factor configured for the sensing reference signal; where the comb factor is greater than a set value; Generate a frequency-domain reference sequence according to the frequency spectrum range used by the sensing device, and map the frequency-domain reference sequence to a frequency-domain reference signal according to the comb factor; Generate a time-domain baseband signal according to the frequency-domain reference signal, and add a cyclic prefix to the time-domain baseband signal; where there are N S time-domain samples on the OFDM symbol in the time-domain baseband signal, and there are N CP time-domain samples on the cyclic prefix; Perform upmixing on the time-domain baseband signal after adding the cyclic prefix to obtain the sensing reference signal.

[0019] As a possible implementation, the processor performs generating a time-domain baseband signal according to the frequency-domain reference signal, specifically: Increase the power of the frequency-domain reference signal according to the comb factor to obtain an adjusted frequency-domain reference signal; Perform an IFFT transform on the adjusted frequency-domain reference signal to obtain the time-domain baseband signal.

[0020] As a possible implementation, the processor performs identifying the distance between the sensing target and the sensing device in the communication and sensing environment based on the second baseband signal, specifically: Perform channel estimation on the second baseband signal to obtain a target channel estimation result; Identify the distance between the sensing target and the sensing device according to the target channel estimation result.

[0021] As a possible implementation, the processor performs channel estimation on the second baseband signal to obtain a target channel estimation result, specifically: According to Determine the FFT length; Perform an FFT transform on the second baseband signal according to the FFT length to obtain a frequency-domain received signal; Perform frequency-domain channel estimation on the frequency-domain received signal to obtain an intermediate channel estimation result; Perform time-delay domain channel estimation on the intermediate channel estimation result to obtain the target channel estimation result.

[0022] As a possible implementation, the sensing reference signal is generated according to the frequency-domain reference signal, and the frequency-domain reference signal includes multiple frequency-domain samples; The processor performs frequency-domain channel estimation on the frequency-domain received signal to obtain an intermediate channel estimation result, specifically: Determine the target frequency-domain samples carrying the reference signal from the multiple frequency-domain samples in the frequency-domain reference signal; Perform frequency-domain channel estimation on the frequency-domain received signal according to the conjugate of the sampling values of the target frequency-domain samples in the frequency-domain reference signal to obtain the intermediate channel estimation result.

[0023] As a possible implementation, the processor performs time-delay domain channel estimation on the intermediate channel estimation result to obtain the target channel estimation result, specifically: Perform an IFFT transform on the intermediate channel estimation result based on the FFT length to obtain the target channel estimation result.

[0024] As a possible implementation, the target channel estimation result includes multiple time-domain samples; the processor executes to identify the distance between the sensing target and the sensing device according to the target channel estimation result, specifically: determine the target time-domain samples belonging to the sensing target from the multiple time-domain samples of the target channel estimation result; determine the time delay of the sensing target according to the arrangement position of the target time-domain samples in the target channel estimation result; determine the distance between the sensing target and the sensing device according to the time delay of the sensing target.

[0025] As a possible implementation, the processor executes to determine the time delay of the sensing target according to the arrangement position of the target time-domain samples in the target channel estimation result, specifically: obtain the subcarrier spacing SCS between multiple subcarriers within the occupied bandwidth of the sensing reference signal; according to the SCS and N S , determine the intermediate frequency sampling interval; determine the time delay of the sensing target according to the product of the intermediate frequency sampling interval and the arrangement position.

[0026] As a possible implementation, the processor executes to determine the distance between the sensing target and the sensing device according to the time delay of the sensing target, specifically: determine the distance between the sensing target and the sensing device according to the product of the speed of light and the time delay.

[0027] According to another aspect of the present application, a recognition device for a sensing target is provided, which is applied to a sensing device. The device includes:

[0028] A sending unit, configured to send a sensing reference signal to the communication and sensing environment; wherein, the comb factor of the sensing reference signal is greater than a set value, the OFDM symbols in the sensing reference signal include a first number N S of time-domain samples, and the cyclic prefix in the sensing reference signal includes a second number N CP of time-domain samples;

[0029] A detection unit, configured to detect the communication and sensing environment to obtain a sensing echo signal, where the sensing echo signal is a signal reflected by the sensing reference signal through a sensing target in the communication and sensing environment;

[0030] A processing unit, configured to perform radio frequency preprocessing on the sensing echo signal to obtain a first baseband signal, and delete the first N frontmost and the last N CP time-domain samples of the first baseband signal to obtain a second baseband signal;

[0031] An identification unit, configured to identify the distance between the sensing target and the sensing device in the communication and sensing environment based on the second baseband signal.

[0032] As a possible implementation, the sensing reference signal is generated by the following unit:

[0033] An acquisition unit, configured to acquire a comb factor configured for a sensing reference signal; wherein, the comb factor is greater than a set value;

[0034] A first generation unit, configured to generate a frequency-domain reference sequence according to a spectrum range used by a sensing device, and map the frequency-domain reference sequence to a frequency-domain reference signal according to the comb factor;

[0035] A second generation unit, configured to generate a time-domain baseband signal according to the frequency-domain reference signal, and add a cyclic prefix to the time-domain baseband signal; wherein, there are N time-domain samples on an OFDM symbol in the time-domain baseband signal, and there are N time-domain samples on the cyclic prefix; S and N time-domain samples are included on the cyclic prefix; CP

[0036] A mixing unit, configured to perform upmixing on the time-domain baseband signal after adding the cyclic prefix to obtain a sensing reference signal.

[0037] As a possible implementation manner, the second generation unit is specifically configured to: increase the power of the frequency-domain reference signal according to the comb factor to obtain an adjusted frequency-domain reference signal; perform IFFT transformation on the adjusted frequency-domain reference signal to obtain a time-domain baseband signal.

[0038] As a possible implementation manner, an identification unit is specifically configured to: perform channel estimation on a second baseband signal to obtain a target channel estimation result; identify a distance between a sensing target and a sensing device according to the target channel estimation result.

[0039] As a possible implementation manner, the identification unit is specifically configured to: according to determine an FFT length; perform FFT transformation on the second baseband signal according to the FFT length to obtain a frequency-domain received signal; perform frequency-domain channel estimation on the frequency-domain received signal to obtain an intermediate channel estimation result; perform time-delay domain channel estimation on the intermediate channel estimation result to obtain a target channel estimation result.

[0040] As a possible implementation manner, the sensing reference signal is generated according to the frequency-domain reference signal, and the frequency-domain reference signal includes multiple frequency-domain samples; the identification unit is specifically configured to: determine target frequency-domain samples carrying a reference signal from the multiple frequency-domain samples in the frequency-domain reference signal; perform frequency-domain channel estimation on the frequency-domain received signal according to the conjugate of the sampling values of the target frequency-domain samples in the frequency-domain reference signal to obtain an intermediate channel estimation result.

[0041] As a possible implementation manner, the identification unit is specifically configured to: perform IFFT transformation on the intermediate channel estimation result based on the FFT length to obtain a target channel estimation result.

[0042] As a possible implementation, the target channel estimation result includes multiple time-domain samples; the recognition unit is specifically configured to: determine target time-domain samples belonging to the sensing target from the multiple time-domain samples of the target channel estimation result; determine the time delay of the sensing target according to the arrangement position of the target time-domain samples in the target channel estimation result; and determine the distance between the sensing target and the sensing device according to the time delay of the sensing target.

[0043] As a possible implementation, the recognition unit is specifically configured to: obtain the subcarrier spacing SCS between multiple subcarriers within the occupied bandwidth of the sensing reference signal; determine the intermediate frequency sampling interval according to the SCS and N S , and determine the time delay of the sensing target according to the product of the intermediate frequency sampling interval and the arrangement position.

[0044] As a possible implementation, the recognition unit is specifically configured to: determine the distance between the sensing target and the sensing device according to the product of the speed of light and the time delay.

[0045] According to another aspect of the present application, there is provided a processor-readable storage medium storing a computer program for causing a processor to execute any one of the foregoing sensing target recognition methods.

[0046] According to another aspect of the present application, there is provided a computer program product which, when the instructions in the computer program product are executed by a processor, executes any one of the foregoing sensing target recognition methods.

[0047] The present application has the following technical effects: It is possible to effectively expand the sensing ranging range by configuring the comb factor of the sensing reference signal to be greater than a set value (exemplarily, the value of this comb factor can be 2) without changing the traditional OFDM configuration method and the sensing reference signal transmission form. For example, taking the SCS between multiple subcarriers within the occupied bandwidth of the sensing reference signal as 30KHz as an example, when the comb factor of the sensing reference signal = 2, the equivalent subcarrier spacing is 60KHz, and the equivalent CP length is extended to: + the time length of the original cyclic prefix in the sensing reference signal. For example, when the SCS is 30KHz, the time length of the original cyclic prefix in the sensing reference signal is 2.34us. At this time, the equivalent CP length is extended to: 16.67us + 2.34us = 19.01us, and the sensing ranging range is extended from the original 350 meters to 2.5 kilometers. It can not only increase the sensing ranging range but also ensure that the time-frequency resources of the original system are not wasted.

[0048] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become easily understood through the following description. Description of the Drawings

[0049] The drawings are used to better understand the present solution and do not constitute a limitation to the present application. Among them:

[0050] Figure 1 is a schematic diagram of the perception ranging range of the traditional CP length;

[0051] Figure 2 is a schematic flowchart of a method for identifying a perceived target provided by an embodiment of the present application;

[0052] Figure 3 is a schematic flowchart of another method for identifying a perceived target provided by an embodiment of the present application;

[0053] Figure 4 is a schematic flowchart of another method for identifying a perceived target provided by an embodiment of the present application;

[0054] Figure 5 is a schematic flowchart of another method for identifying a perceived target provided by an embodiment of the present application;

[0055] Figure 6 is a schematic diagram of the perception ranging range of the semi-symbol based on the comb factor configuration provided by an embodiment of the present application;

[0056] Figure 7 is a schematic diagram of the implementation principle of the extended perception ranging range based on semi-symbol perception provided by an embodiment of the present application;

[0057] Figure 8 is a schematic diagram of the equivalent CP extension provided by an embodiment of the present application;

[0058] Figure 9 is a schematic diagram of removing the equivalent extended CP and CS provided by an embodiment of the present application;

[0059] Figure 10 is a schematic diagram of the structure of a perception device provided by an embodiment of the present application;

[0060] Figure 11 is a schematic diagram of the structure of a device for identifying a perceived target provided by an embodiment of the present application. Detailed Embodiments

[0061] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0062] That is, the term "and / or" in the embodiments of the present application describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0063] In the ranging application of communication-sensing integration based on the OFDM signal waveform, the ranging range of the sensing target is limited by the CP length of the OFDM symbol. In order to expand the ranging range of the sensing target, a simple idea is to directly expand the CP length of the original OFDM symbol. However, this method usually causes resource waste.

[0064] As an example, under the common subcarrier spacing configuration of 30 KHz (kilohertz), the duration of the OFDM symbol is 33.33 microseconds, and the typical CP length is 2.34 microseconds. The ranging range of the sensing target can be as Figure 1 shown.

[0065] Among them, Figure 1 the T in CP is the CP length, T SYM is the duration of the OFDM symbol, t TX is the timing duration of the sensing transmitting end, and S RX is the sensing distance (or ranging distance) of the sensing receiving end.

[0066] From Figure 1 it can be seen that in the case of transceiver synchronization, the ranging range of the sensing target is about 350 meters. The echo signal of the sensing target exceeding 350 meters cannot obtain a complete OFDM signal within the receiving detection window, and the echo signal will generate symbol interference between subcarriers, and the channel measurement cannot be performed normally, ultimately affecting the distance measurement of the sensing target. Among them, Figure 1 the shaded part between 350 meters and 5350 meters in

[0067] In the related art, there is no unified method for expanding the sensing ranging range of extended sensing targets or joint sensing and communication targets. The simple idea is to directly expand the CP length of the original OFDM symbol. For example, within a time slot, reduce the configuration of the original 14 OFDM symbols. If it is reduced to 12 OFDM symbols, the CP length can be extended to approximately 8.33 microseconds, and the ranging range can be extended to 1.25 kilometers.

[0068] However, this method sacrifices the time-domain resources of 2 OFDM symbols, resulting in a waste of resources.

[0069] In view of at least one of the above problems, this application provides a method, device, sensing device, and storage medium for identifying sensing targets.

[0070] The following describes the method, device, sensing device, and storage medium for identifying sensing targets in this embodiment with reference to the accompanying drawings. Before specifically describing the embodiments of this application, for ease of understanding, first introduce the commonly used technical terms:

[0071] The joint sensing and communication environment refers to the sensing environment, that is, the set of all scatterers that the sensing reference signal experiences on the way from the sensing transmitter to the sensing receiver. For example, taking the identification of sensing targets in intelligent transportation as an example for illustration, the joint sensing and communication environment may include vehicles, pedestrians, road infrastructure, obstacles, animals, etc. in road traffic, that is, the set of all objects that will affect the sensing reference signal.

[0072] This application takes the example that the sensing receiver and the sensing transmitter are located in the same communication device (denoted as the sensing device in this application).

[0073] It should be noted that the method for identifying sensing targets provided in this application can be applied to the joint sensing and communication channel or the communication channel, and can also be applied to the joint sensing and communication environment. This application only takes the example of applying this method to the joint sensing and communication environment.

[0074] The comb factor is a parameter used to control the transmission and reception of signals to optimize the quality and efficiency of signal transmission. Among them, the comb factor can be adjusted according to different system requirements and application scenarios to achieve the best signal transmission effect.

[0075] Time-domain samples, also known as time-domain sampling points, refer to the sampling points obtained by sampling the time-domain signal.

[0076] Frequency-domain samples, also known as frequency-domain sampling points, refer to the sampling points obtained by sampling the frequency-domain signal. Among them, the number of frequency-domain samples is less than or equal to the FFT (Fast Fourier Transform) length, and each frequency-domain sample corresponds to a subcarrier.

[0077] Perception targets: In different application scenarios, the perception targets can be different. For example, in the intelligent transportation scenario, the perception targets can be vehicles, pedestrians, animals (such as pets), objects (such as roadblocks, garbage, etc.). In the intelligent factory scenario, the perception targets can be movable robots / robotic arms, products, other devices, etc.

[0078] Perception devices: In different application scenarios, the perception devices can be different. For example, in the intelligent transportation scenario, the perception devices can be access network devices, roadside units, vehicles, etc. In the intelligent factory scenario, the perception devices can be fixed devices, movable devices, etc. in the intelligent factory. The embodiments of the present application do not limit this.

[0079] Among them, the access network device is exemplified by a base station. The base station may include multiple cells that provide services to terminals. Depending on the specific application scenario, the base station may also be referred to as an access point, or may be a device in the access network that communicates with wireless terminals through one or more sectors on the air interface, or other names. The access network device can be used to mutually replace the received air frames and Internet Protocol (IP) packets, and act as a router between the wireless terminal and the rest of the access network, where the rest of the access network may include an Internet Protocol (IP) communication network. The access network device can also coordinate the attribute management of the air interface. For example, the access network device involved in the embodiments of the present application can be an access network device (Base Transceiver Station, BTS) in a Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA), or can be an access network device (NodeB) in a Wide-band Code Division Multiple Access (WCDMA), or can also be an evolved access network device (evolutional Node B, eNB or e-NodeB) in a Long Term Evolution (LTE) system, a 5G base station (gNB) in a 5G network architecture (next generation system), or can also be a Home evolved Node B (HeNB), a relay node, a femto, a pico, etc. The embodiments of the present application do not limit this. In some network architectures, the access network device may include a Centralized Unit (CU) node and a Distributed Unit (DU) node, and the centralized unit and the distributed unit may also be geographically separated.

[0080] Among them, the terminal can be a device that provides voice and / or data connectivity to the user, such as a handheld device with wireless connection capabilities, or other processing devices connected to a wireless modem, etc. In different systems, the name of the terminal may also be different. For example, in a 5G system, the terminal can be called a User Equipment (UE). Among them, the wireless terminal can communicate with one or more Core Networks (CNs) via a Radio Access Network (RAN). The wireless terminal can be a mobile terminal, such as a mobile phone (or a "cellular" phone) and a computer with a mobile terminal. For example, it can be a portable, pocket-sized, handheld, computer-integrated, or vehicle-mounted mobile device that exchanges language and / or data with the wireless access network. For example, devices such as Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). The wireless terminal can also be called a system, a subscriber unit, a subscriber station, a mobile station, a mobile, a remote station, an access point, a remote terminal, an access terminal, a user terminal, a user agent, a user device, which is not limited in the embodiments of the present application.

[0081] Figure 2 It is a schematic flow diagram of a method for identifying a sensing target provided by an embodiment of the present application.

[0082] The method for identifying a sensing target in the embodiments of the present application can be applied to a sensing device.

[0083] Such as Figure 2 As shown, the method for identifying a sensing target may include the following steps:

[0084] Step S201, sending a sensing reference signal to the communication and sensing environment; among them, the comb factor of the sensing reference signal is greater than a set value, and the OFDM symbols in the sensing reference signal include a first quantity N Stime-domain samples, and the cyclic prefix of the sensing reference signal includes a second quantity N CP time-domain samples.

[0085] Wherein, the set value is a preset value. For example, the set value can be 1.

[0086] Wherein, the comb factor of the sensing reference signal is greater than the set value, which means that there are multiple identical sensing reference signals in the frequency domain. This configuration can improve the power of the sensing reference signal on each RE (Resource Element), thereby achieving a proportional increase in the signal strength. Moreover, when the comb factor of the sensing reference signal is greater than the set value, more antennas can simultaneously transmit the sensing reference signal. These signals form a comb structure in the frequency domain, and each frequency-domain sample (referred to as a frequency point) carries multiple identical reference signals. Since these reference signals are the same, they can be added together at the sensing receiving end to enhance the signal strength. In this way, the power of the sensing reference signal can be increased proportionally, thereby improving the signal-to-noise ratio of the signal.

[0087] In an embodiment of the present application, the sensing reference signal may include an OFDM symbol with a first duration T S and a cyclic prefix with a second duration T CP wherein, the OFDM symbol may include a first quantity N S time-domain samples, and the cyclic prefix may include a second quantity N CP time-domain samples.

[0088] As an example, taking the SCS (Sub-carrier Spacing) between multiple subcarriers within the occupied bandwidth of the sensing reference signal as 30 KHz for example, T S can be T CP can be 2.34 us, and N S can be 4096.

[0089] In an embodiment of the present application, the sensing device may send a sensing reference signal to the communication and sensing environment.

[0090] Step S202, detecting the communication and sensing environment to obtain a sensing echo signal, wherein the sensing echo signal is a signal reflected by the sensing reference signal through a sensing target in the communication and sensing environment.

[0091] In an embodiment of the present application, the sensing device may also detect (or sense) the communication and sensing environment to obtain a sensing echo signal, wherein the sensing echo signal is a signal reflected or returned by the sensing reference signal through a sensing target in the communication and sensing environment. For example, the sensing device may periodically detect signals within a detection window to obtain a sensing echo signal.

[0092] Step S203: Perform radio frequency preprocessing on the sensed echo signal to obtain a first baseband signal, and delete the first N / 2 frontmost and the last N time domain samples of the first baseband signal to obtain a second baseband signal. S / 2 frontmost and the last N CP time domain samples to obtain a second baseband signal.

[0093] Among them, the radio frequency preprocessing includes, but is not limited to: down-conversion processing.

[0094] In the embodiment of the present application, the sensing device can perform radio frequency preprocessing on the sensed echo signal to obtain a baseband signal, which is denoted as the first baseband signal in the present application. Then, the sensing device can delete the first frontmost time domain samples of the first baseband signal, and delete the last N CP time domain samples of the first baseband signal to obtain a second baseband signal.

[0095] Step S204: Based on the second baseband signal, identify the distance between the sensing target and the sensing device in the communication and sensing environment.

[0096] In the embodiment of the present application, the sensing device can identify the distance between the sensing target and the sensing device in the communication and sensing environment based on the second baseband signal.

[0097] The method for identifying the sensing target in the embodiment of the present application can effectively expand the sensing ranging range by configuring the combing factor of the sensing reference signal to be greater than a set value (exemplarily, the value of this combing factor can be 2) without changing the traditional OFDM configuration method and the form of sending the sensing reference signal. For example, taking the SCS between multiple subcarriers within the bandwidth occupied by the sensing reference signal as 30KHz as an example, when the combing factor of the sensing reference signal = 2, the equivalent subcarrier spacing is 60KHz, and the equivalent CP length is extended to: + the time length of the original cyclic prefix in the sensing reference signal. For example, when the SCS is 30KHz, the time length of the original cyclic prefix in the sensing reference signal is 2.34us. At this time, the equivalent CP length is extended to: 16.67us + 2.34us = 19.01us, and the sensing ranging range is extended from the original 350 meters to 2.5 kilometers. It can not only increase the sensing ranging range, but also ensure that the time-frequency resources of the original system are not wasted.

[0098] To clearly illustrate how the sensing reference signal is generated in the above embodiments of the present application, the present application also proposes a method for identifying a sensing target.

[0099] Figure 3 is a schematic flowchart of another method for identifying a sensing target provided by the embodiment of the present application.

[0100] As Figure 3 shown, the recognition method of the perception target may include the following steps:

[0101] Step S301, obtaining a comb factor configured for a sensing reference signal; wherein, the comb factor is greater than a set value.

[0102] In an embodiment of the present application, a comb factor pre-configured or set for a sensing reference signal may be obtained; wherein, the comb factor is greater than a set value.

[0103] For example, marking the comb factor as K TC , then it is required that K TC is greater than a set value, and a typical requirement is: K TC = 2.

[0104] Step S302, generating a frequency-domain reference sequence according to the spectrum range used by the sensing device, and mapping the frequency-domain reference sequence into a frequency-domain reference signal according to the comb factor.

[0105] Among them, the spectrum range, also known as the system bandwidth, is used to define the frequency range of signal transmission, and also determines the signal transmission rate and system capacity.

[0106] In an embodiment of the present application, the sensing device may generate a frequency-domain reference sequence according to the spectrum range used by the sensing device. For example, the frequency-domain reference sequence may be a ZC sequence (Zadoff-Chu sequence).

[0107] In an embodiment of the present application, the sensing device may also map the frequency-domain reference sequence into a frequency-domain reference signal according to the comb factor configuration.

[0108] Step S303, generating a time-domain baseband signal according to the frequency-domain reference signal, and adding a cyclic prefix to the time-domain baseband signal.

[0109] In an embodiment of the present application, the sensing device may generate a time-domain baseband signal according to the frequency-domain reference signal. Among them, the time-domain baseband signal contains OFDM symbols, and there are N S time-domain sample points on the OFDM symbol.

[0110] As an example, the generation method of the time-domain baseband signal may be, for example:

[0111] 1. The sensing device may increase the power of the frequency-domain reference signal according to the comb factor to obtain an adjusted frequency-domain reference signal.

[0112] For example, marking the frequency-domain reference signal as S(n), where n is the number of frequency-domain sample points or the serial number of the frequency-domain sample points in the frequency-domain reference signal, and marking the adjusted frequency-domain reference signal as The following formula can be used to adjust S(n) to obtain

[0113] 2. Perform an IFFT (Inverse Fast Fourier Transform) on the adjusted frequency-domain reference signal to obtain a time-domain baseband signal.

[0114] For example, if the time-domain baseband signal is marked as s(t), then there is:[[]]END]]

[0115]

[0116] In the embodiments of the present application, the sensing device can also add a cyclic prefix CP to the time-domain baseband signal, where the cyclic prefix contains N CP time-domain samples.

[0117] Step S304: Perform upmixing on the time-domain baseband signal after adding the cyclic prefix to obtain a sensing reference signal.

[0118] In the embodiments of the present application, the sensing device can perform upmixing on the time-domain baseband signal after adding the cyclic prefix to obtain a sensing reference signal. For example, the sensing device can perform frequency upconversion on the time-domain baseband signal after adding the cyclic prefix to obtain a sensing reference signal.

[0119] Step S305: Transmit the sensing reference signal to the communication and sensing environment.

[0120] Step S306: Detect the communication and sensing environment to obtain a sensing echo signal.

[0121] Among them, the sensing echo signal is the signal reflected by the sensing reference signal through the sensing target in the communication and sensing environment.

[0122] Step S307: Perform radio frequency preprocessing on the sensing echo signal to obtain a first baseband signal, and delete the first N S / 2 time-domain samples and the last N CP time-domain samples of the first baseband signal to obtain a second baseband signal.

[0123] Step S308: Based on the second baseband signal, identify the distance between the sensing target in the communication and sensing environment and the sensing device.

[0124] For the explanatory descriptions of steps S305 to S308, reference can be made to the relevant descriptions in any embodiment of the present application, and details are not described herein again.

[0125] In the recognition method of the sensing target according to the embodiment of the present application, the comb factor of the sensing reference signal is configured to be greater than a set value. On this basis, the sensing reference signal can be regarded as a half OFDM symbol (abbreviated as half symbol) with an equivalent CP extension. At this time, the equivalent CP length has exceeded the equivalent signal length. For example, taking the SCS between multiple subcarriers within the occupied bandwidth of the sensing reference signal as 30 KHz for illustration, the equivalent CP length is 19.01 us, and the equivalent signal length is 16.67 us. The sensing ranging range is no longer limited by the CP length, so that the sensing ranging range can be extended to the distance interval covered by the entire half symbol.

[0126] To clearly illustrate how to identify the distance between the sensing target and the sensing device in the communication and sensing environment based on the second baseband signal in the above embodiments of the present application, the present application also proposes a recognition method of the sensing target.

[0127] Figure 4 It is a schematic flowchart of another recognition method of the sensing target provided by the embodiment of the present application.

[0128] As Figure 4 shown, the recognition method of the sensing target may include the following steps:

[0129] Step S401, sending a sensing reference signal to the communication and sensing environment.

[0130] Among them, the comb factor of the sensing reference signal is greater than a set value, the OFDM symbol in the sensing reference signal includes the first number N S of time-domain samples, and the cyclic prefix in the sensing reference signal includes the second number N CP of time-domain samples.

[0131] Step S402, detecting the communication and sensing environment to obtain a sensing echo signal.

[0132] Among them, the sensing echo signal is the signal reflected by the sensing reference signal through the sensing target in the communication and sensing environment.

[0133] Step S403, performing radio frequency preprocessing on the sensing echo signal to obtain a first baseband signal, and deleting the first N S / 2 time-domain samples at the front and the last N CP time-domain samples of the first baseband signal to obtain a second baseband signal.

[0134] For the explanation of steps S401 to S403, reference can be made to the relevant descriptions in any embodiment of the present application, which will not be elaborated here.

[0135] Step S404, performing channel estimation on the second baseband signal to obtain a target channel estimation result.

[0136] In the embodiments of the present application, the sensing device may perform channel estimation on the second baseband signal to obtain a channel estimation result, which is denoted as the target channel estimation result in the present application.

[0137] Step S405: Identify the distance between the sensing target and the sensing device according to the target channel estimation result.

[0138] In the embodiments of the present application, the sensing device may identify the distance between the sensing target and the sensing device in the communication and sensing environment according to the target channel estimation result.

[0139] In any embodiment of the present application, the calculation method of the distance between the sensing target and the sensing device may be, for example:

[0140] 1. Based on the signal processing algorithm in the related art, the target time-domain samples belonging to the sensing target may be determined or identified from multiple time-domain samples of the target channel estimation result.

[0141] 2. The delay of the sensing target may be determined according to the arrangement position (or serial number) of the target time-domain samples in the target channel estimation result.

[0142] Among them, the arrangement positions of multiple time-domain samples may be determined according to the echo delay or reception time of multiple time-domain samples. Among them, the smaller the echo delay of the time-domain sample, the earlier the reception time of the time-domain sample. For example, multiple time-domain samples may be sorted in ascending order of echo delay, that is, multiple time-domain samples may be sorted in ascending order of reception time to obtain the arrangement position of each time-domain sample.

[0143] Among them, the delay of the sensing target is positively correlated with the arrangement position (or serial number) of the above-mentioned target time-domain samples.

[0144] As an example, the determination method of the delay of the sensing target may be, for example: First, the SCS between multiple subcarriers within the occupied bandwidth of the sensing reference signal may be obtained. After that, according to the SCS and N S , the intermediate frequency sampling interval may be determined. For example, the intermediate frequency sampling interval may be: Finally, the delay of the sensing target may be determined according to the product of the intermediate frequency sampling interval and the arrangement position of the target time-domain samples.

[0145] For example, mark the arrangement position (or serial number) of the target time-domain sample in the target channel estimation result as k, and the delay corresponding to the sensing target as τ k , then there is:

[0146] τ k = k * T sa ; (3)

[0147] Among them, T saRepresents the intermediate frequency sampling interval, T sa is determined according to SCS and N S For example, with a subcarrier spacing SCS of 30 KHz, N S can be 4096, then there is:

[0148]

[0149] where ns refers to nanoseconds and us refers to microseconds.

[0150] 3. Determine the distance between the sensing target and the sensing device according to the time delay of the sensing target.

[0151] Among them, the distance between the sensing target and the sensing device is positively correlated with the time delay of the sensing target.

[0152] For example, mark the distance between the sensing target and the sensing device as Range, and Range can be calculated using the following formula:

[0153] Range = c * τ k ; (4)

[0154] where c represents the speed of light.

[0155] The method for identifying a sensing target in the embodiments of this application can effectively calculate the distance between the sensing target and the sensing device based on channel estimation, improving the effectiveness of sensing target identification.

[0156] To clearly illustrate how the second baseband signal is channel estimated in the above embodiments of this application to obtain the target channel estimation result, this application also proposes a method for identifying a sensing target.

[0157] Figure 5 is a schematic flowchart of another method for identifying a sensing target provided by the embodiments of this application.

[0158] As Figure 5 shown, this method for identifying a sensing target may include the following steps:

[0159] Step S501, send a sensing reference signal to the communication and sensing environment.

[0160] Among them, the comb factor of the sensing reference signal is greater than the set value, the OFDM symbols in the sensing reference signal include the first number N S of time-domain samples, and the cyclic prefix in the sensing reference signal includes the second number N CP of time-domain samples.

[0161] Step S502, detect the communication and sensing environment to obtain a sensing echo signal.

[0162] Among them, the sensed echo signal is the signal reflected by the sensed target in the communication-sensing environment from the sensed reference signal.

[0163] Step S503: Perform radio frequency preprocessing on the sensed echo signal to obtain a first baseband signal, and delete the first N / 2 and the last N time domain samples in the first baseband signal to obtain a second baseband signal. S / 2 and the last N CP time domain samples to obtain a second baseband signal.

[0164] For the explanatory descriptions of steps S501 to S503, reference can be made to the relevant descriptions in any embodiment of this application, which will not be elaborated here.

[0165] Step S504: Determine the FFT length according to N / 2. S / 2 to determine the FFT length.

[0166] Among them, the FFT length provided by this application is in a positive correlation relationship with

[0167] As an example, mark the FFT length (or the number of FFT points) provided by this application as Then Among them, N FFT is the FFT length in the conventional Fourier transform, and N FFT = N S .

[0168] Step S505: Perform FFT transformation on the second baseband signal according to the FFT length to obtain a frequency domain received signal.

[0169] In the embodiment of this application, the sensing device can perform FFT transformation on the second baseband signal according to the FFT length to obtain a frequency domain received signal.

[0170] For example, mark the second baseband signal as r(t) and mark the frequency domain received signal as R(n), then there is:

[0171]

[0172] Step S506: Perform frequency domain channel estimation on the frequency domain received signal to obtain an intermediate channel estimation result.

[0173] In the embodiment of this application, the sensing device can perform frequency domain channel estimation on the frequency domain received signal to obtain an intermediate channel estimation result.

[0174] In any embodiment of this application, the sensed reference signal is generated according to the frequency domain reference signal S(n), where the frequency domain reference signal includes multiple frequency domain samples. At this time, the acquisition method of the intermediate channel estimation result can be, for example:

[0175] 1. Determine the target frequency-domain samples carrying the reference signal from multiple frequency-domain samples in the frequency-domain reference signal.

[0176] Since not all frequency-domain samples carry the reference signal, in this application, the target frequency-domain samples carrying the reference signal can be determined from multiple frequency-domain samples in the frequency-domain reference signal.

[0177] 2. Perform frequency-domain channel estimation on the frequency-domain received signal according to the conjugate of the sampling values of the target frequency-domain samples in the frequency-domain reference signal to obtain an intermediate channel estimation result.

[0178] As an example, mark the intermediate channel estimation result as CH(n), and CH(n) can be calculated using the following formula:

[0179] CH(n) = R(n).* conj(S(n')); (6)

[0180] Among them,.* means element-wise multiplication, conj represents taking the complex conjugate, n' represents the serial number of the frequency-domain samples (denoted as target frequency-domain samples in this application) configured with or carrying the reference signal in the comb-shaped frequency-domain reference signal, and S(n') represents the sampling value of the target frequency-domain samples.

[0181] Step S507: Perform time-delay domain channel estimation on the intermediate channel estimation result to obtain the target channel estimation result.

[0182] In the embodiments of this application, the sensing device can perform time-delay domain channel estimation on the intermediate channel estimation result to obtain the target channel estimation result.

[0183] As an example, the sensing device can perform IFFT transformation on the intermediate channel estimation result based on the FFT length to obtain the target channel estimation result. For example, mark the target channel estimation result as ch(t), then there is:

[0184]

[0185] Step S508: Identify the distance between the sensing target and the sensing device according to the target channel estimation result.

[0186] For the explanation of step S508, please refer to the relevant descriptions in any embodiment of this application, and details will not be elaborated here.

[0187] The method for identifying the sensing target in the embodiments of this application can effectively calculate the distance between the sensing target and the sensing device based on channel estimation, improving the effectiveness of sensing target identification.

[0188] In any one of the embodiments of the present application, the present application proposes an equivalent CP extension method based on comb factor configuration, which performs half OFDM symbol (hereinafter referred to as half symbol for short) sensing on the sensed echo signal. Without changing the existing OFDM configuration method, the sensing ranging range is increased. Therefore, the number of time-domain resources of the OFDM symbol is not reduced, effectively ensuring that the communication time-frequency resources are not wasted.

[0189] That is, the present application proposes an equivalent CP extension method based on comb factor configuration. While extending the CP length and increasing the sensing ranging range, it does not change the existing OFDM configuration method, does not reduce the number of time-domain resources of the OFDM symbol, and effectively ensures the communication time-frequency resources. In addition, the configuration of the comb factor will increase the subcarrier spacing. However, since the occupied bandwidth of the OFDM symbol remains unchanged, the sensing resolution of the distance will not be changed.

[0190] Taking the subcarrier spacing of 30 KHz as an example, when the comb factor = 2, the equivalent subcarrier spacing is 60 KHz. At this time, as long as the echo (2048 time-domain samples) data can be quadrature demodulated, and the equivalent CP length is extended to 19.01 microseconds (16.67 microseconds of cyclic prefix + 2.34 microseconds of cyclic suffix). At this time, the sensing distance is mainly limited by the sensing echo time length of 16.67 us. Therefore, the sensing ranging range is extended to 2.5 kilometers, as Figure 6 shown.

[0191] Among them, Figure 6 the shaded part between 1000 meters and 5350 meters is the detection window, T CP is the CP length, T SYM is the duration of half an OFDM symbol, t TX is the timing duration of the sensing transmitter, S RX is the sensing distance of the sensing receiver (or called ranging distance). The present application takes the sensing transmitter and the sensing receiver being located in the same device (i.e., the sensing device) as an example.

[0192] The advantage of the above solution is that it does not change the existing sensing transmission process of the OFDM signal. Only when detecting and positioning, the subcarrier spacing needs to be processed according to 60 KHz.

[0193] It should be noted that although Figure 6 the window of the detected echo signal in is shortened by half and the signal power is also reduced by half, but since the comb factor = 2, only half of the frequency-domain samples have sensing reference signals transmitted. Therefore, the frequency-domain samples carrying the sensing reference signals can be power-boosted by 3 dB (decibels), and the sensing ranging range will not shrink from the energy perspective.

[0194] When the comb factor = 4, the perceived echo time length is 8.33 us, and the perceived ranging range is 1.25 km. Instead, the perceived ranging range will be reduced. Therefore, the optimal configuration value of the comb factor can be 2. In addition, if the subcarrier spacing of the system is directly configured to be 60 KHz, since the CP length at this time will be shorter, about 2.34 / 2 = 1.17 microseconds, the perceived ranging range is smaller.

[0195] As an example, taking the subcarrier spacing of 30 KHz as an example, the comb factor of the perceived reference signal can be configured to be 2. On this basis, the perceived reference signal is regarded as half of an OFDM symbol (abbreviated as half-symbol) with an equivalent CP extended. At this time, the equivalent CP length (16.67 us cyclic prefix + 2.34 us cyclic suffix = 19.01 us) has exceeded the equivalent signal length (16.67 us), and the perceived ranging range is no longer limited by the CP length. Thus, the perceived ranging range can be extended to the distance interval covered by the entire half-symbol. When performing the processing of the perceived echo signal, the half-symbol is perceived and processed. Among them, the implementation principle of the extended perceived ranging range based on half-symbol perception can be as Figure 7 shown, mainly including the following five parts:

[0196] The first part, the transmission of the perceived reference signal based on the comb factor configuration.

[0197] This part mainly completes the transmission of the perceived reference signal. The same as the traditional method of transmitting the perceived signal, its main feature is that the comb factor K TC needs to be greater than the set value. Exemplarily, K TC is equal to 2, aiming to create the condition for the equivalent extended CP length. The feature is that the power of the perceived reference signal on each RE (Resource Element) should be increased proportionally.

[0198] This part mainly includes the following steps:

[0199] 1.1. Set the comb factor K of the perceived reference signal TC , requiring K TC to be greater than the set value. Typically, the requirement is: K TC = 2;

[0200] 1.2. Based on the system bandwidth (i.e., the total spectrum range used by the sensing device, which defines the frequency range of signal transmission and also determines the signal transmission rate and system capacity), generate a frequency-domain reference sequence (such as a ZC sequence), and map the frequency-domain reference sequence according to K TC configuration to the frequency-domain reference signal, denoted as S(n), where n is the number of frequency-domain sample points used;

[0201] 1.3 According to K TC Configuration, improve the power of the frequency domain reference signal, and increase the power of the frequency domain reference signal to the original K TC times, that is:

[0202] 1.4. Use IFFT algorithm to convert the frequency domain reference signal into the time domain reference signal, and get the time length of an OFDM symbol as T S The time domain baseband signal s(t) is: And add a time length of T before the OFDM symbol CP Finally, the perception reference signal is obtained after up-mixing, and the perception reference signal is sent to the synaesthesia environment.

[0203] The second part is the reception of the sensing echo signal, that is, receiving the sensing echo signal returned by the sensing target.

[0204] The third part is the calculation of equivalent CP extension and CS (Cyclic Suffix) length. For example, in K TC Greater than the set value, for example, K TC When it is equal to 2, the equivalent extended CP length and CS length of the sensing reference signal are calculated, so that the extension of the sensing ranging range can be achieved.

[0205] Perform RF preprocessing on the sensed echo signal to obtain an OFDM symbol + CP length (T S +T CP ) baseband signal, assuming that the number of time domain samples on an OFDM symbol is N S , the number of time domain samples corresponding to CP is N CP , then the total number of time domain samples on the baseband signal is (N S +N CP ).

[0206] The traditional method is to set the header length of the above baseband signal to T CP The CP is removed and the channel estimation is performed on the remaining OFDM symbols to sense the distance of the target.

[0207] In this application, the equivalent CP length is extended to To expand the sensing range, the equivalent CP length is Right now: in, It refers to the time length of half a symbol.

[0208] As an example, the schematic diagram of equivalent CP expansion can be as follows Figure 8 As shown ( Figure 8Among them, OFDM refers to the entire OFDM symbol, and OFDM’ refers to a half symbol (i.e., half of an OFDM symbol). At this time, the number of time-domain samples of the equivalent extended CP is It should be noted that at this time, a CS is added, and the length of CS is T CS = T CP .

[0209] Part 4: Remove the equivalent extended CP and CS to obtain a half symbol (i.e., half of an OFDM symbol).

[0210] Perform the operation of removing the equivalent extended CP and CS on the received perceived echo signal in the time domain. The CP to be removed in this process is different from the CP of the transmitted perceived reference signal, so it is called removing the equivalent extended CP, and a CS is newly added.

[0211] That is, the de-CP functional module in the traditional method can be modified to a de-equivalent extended CP module. The specific method is to delete the first S + N CP ) time-domain samples and the last N time-domain samples from the baseband signal with a length of (N CP ) to obtain an echo time-domain baseband signal with a time length of and the number of time-domain samples of (denoted as the second baseband signal in this application), and denote this echo time-domain baseband signal as r(t).

[0212] An example, the schematic diagram of removing the equivalent extended CP and CS can be as Figure 9 shown.

[0213] Part 5: Perform channel estimation on the half symbol and calculate the distance of the perceived target.

[0214] Perform channel estimation on the remaining half symbol after removing the equivalent extended CP and CS, and calculate the distance of the perceived target based on the time-delay domain channel estimation (channel impulse response).

[0215] Perform channel estimation on r(t) after removing CP / CS. Since r(t) after removing CP only has the time length of a half symbol, this echo time-domain baseband signal can be called a half-symbol echo. Therefore, the number of FFT points or the FFT length in the traditional method (equal to the number of time-domain samples of the OFDM symbol, i.e., N FFT = N S ) needs to be reduced to half of the original, that is This part mainly includes the following steps:

[0216] 5.1. Calculate the frequency-domain received signal of the half symbol, where the number of FFT points is That is,

[0217] 5.3. Calculate the frequency-domain channel estimation of the semi-symbol, CH(n) = R(n).*conj(S(n')), where.* denotes element-wise multiplication, conj represents taking the complex conjugate, and n' represents the sequence number of the frequency-domain sample points in the comb-shaped frequency-domain reference signal that are configured with or carry reference signals;

[0218] 5.3. Calculate the time-delay domain channel estimation of the semi-symbol,

[0219] 5.4. Extract the time-domain sample points corresponding to the sensing target from ch(t), and determine the arrangement position or sequence number k corresponding to the time-domain sample points. Then, the time delay corresponding to the sensing target is: τ k = k*T sa ;

[0220] where T sa represents the intermediate frequency sampling interval, and T sa is determined according to the SCS and N S . Taking the subcarrier spacing SCS as 30 KHz as an example, N S can be 4096, then there is:

[0221] 5.5. Calculate the distance Range between the sensing target and the sensing device, that is, Range = c*τ k , where c represents the speed of light.

[0222] The value ranges of the number of frequency-domain sample points n of the above semi-symbol and the sequence number k corresponding to the time-domain sample points are: The values are all positive integers.

[0223] It should be noted that the above gives the distance calculation process with a subcarrier spacing of 30 KHz, and other similar subcarrier spacing configurations are also within the protection scope of this application.

[0224] In summary, compared with the prior art, the technical solution provided by this application has at least the following advantages: On the basis of not changing the traditional OFDM sensing reference signal transmission form, by configuring the comb factor to be greater than a set value (exemplarily, the value of this comb factor can be 2), the sensing ranging range is effectively extended, and the time-frequency resources of the original system are not wasted. Moreover, due to the configuration of the comb factor, the power on the frequency-domain sample points in the frequency-domain reference signal is increased. At the same time, the configuration of the comb factor does not change the sensing resolution of the distance.

[0225] The technical solutions provided by the embodiments of the present application can be applied to a variety of systems, especially 5G systems. For example, the applicable systems can be Global System of Mobile communication (GSM for short), Code Division Multiple Access (CDMA for short), Wideband Code Division Multiple Access (WCDMA for short), General Packet Radio Service (GPRS for short), Long Term Evolution (LTE for short), LTE Frequency Division Duplex (FDD for short), LTE Time Division Duplex (TDD for short), Long Term Evolution Advanced (LTE-A for short), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX for short), 5G New Radio (NR for short) systems, etc. Both terminals and network devices are included in these various systems. The system may also include a core network part, such as an Evolved Packet System (EPS for short), a 5G system (5GS for short), etc.

[0226] To implement the above embodiments, the present application also provides a sensing device.

[0227] Figure 10 It is a schematic structural diagram of a sensing device provided according to the embodiments of the present application.

[0228] As Figure 10 shown, the sensing device may include a transceiver 1000, a processor 1010, and a memory 1020, where:

[0229] The transceiver 1000 is configured to receive and send data under the control of the processor 1010.

[0230] Among them, in Figure 10Among them, the bus architecture may include any number of interconnected buses and bridges, specifically linking together various circuits of one or more processors represented by the processor 1010 and the memory represented by the memory 1020. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and thus will not be further described herein. The bus interface provides an interface. The transceiver 1000 may be multiple components, that is, including a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium, and these transmission media include wireless channels, wired channels, optical fiber cables, and other transmission media. The processor 1010 is responsible for managing the bus architecture and general processing, and the memory 1020 may store data used by the processor 1010 when executing operations.

[0231] The processor 1010 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD), and the processor may also adopt a multi-core architecture.

[0232] The processor 1010 calls the computer program stored in the memory and performs the following operations: sending a sensing reference signal to the sensing environment; wherein, the comb factor of the sensing reference signal is greater than a set value, and the OFDM symbols in the sensing reference signal include a first number N S of time-domain samples, and the cyclic prefix in the sensing reference signal includes a second number N CP of time-domain samples; detecting the sensing environment to obtain a sensing echo signal, wherein the sensing echo signal is a signal reflected by the sensing reference signal through a sensing target in the sensing environment; performing radio frequency preprocessing on the sensing echo signal to obtain a first baseband signal, and deleting the first frontmost and the last N CP time-domain samples to obtain a second baseband signal; and identifying the distance between the sensing target in the sensing environment and the sensing device based on the second baseband signal.

[0233] As a possible implementation, the processor 1010 performs the following steps to generate a sensing reference signal: Obtain the comb factor configured for the sensing reference signal; wherein, the comb factor is greater than a set value; Generate a frequency-domain reference sequence according to the spectrum range used by the sensing device, and map the frequency-domain reference sequence to a frequency-domain reference signal according to the comb factor; Generate a time-domain baseband signal according to the frequency-domain reference signal, and add a cyclic prefix to the time-domain baseband signal; wherein, the OFDM symbol in the time-domain baseband signal includes N S time-domain samples, and the cyclic prefix includes N CP time-domain samples; Perform upmixing on the time-domain baseband signal after adding the cyclic prefix to obtain the sensing reference signal.

[0234] As a possible implementation, the processor 1010 generates a time-domain baseband signal according to the frequency-domain reference signal, specifically: Increase the power of the frequency-domain reference signal according to the comb factor to obtain an adjusted frequency-domain reference signal; Perform an IFFT transform on the adjusted frequency-domain reference signal to obtain the time-domain baseband signal.

[0235] As a possible implementation, the processor 1010 identifies the distance between the sensing target and the sensing device in the communication and sensing environment based on the second baseband signal, specifically: Perform channel estimation on the second baseband signal to obtain a target channel estimation result; Identify the distance between the sensing target and the sensing device according to the target channel estimation result.

[0236] As a possible implementation, the processor 1010 performs channel estimation on the second baseband signal to obtain a target channel estimation result, specifically: Determine the FFT length according to ; Perform an FFT transform on the second baseband signal according to the FFT length to obtain a frequency-domain received signal; Perform frequency-domain channel estimation on the frequency-domain received signal to obtain an intermediate channel estimation result; Perform time-delay domain channel estimation on the intermediate channel estimation result to obtain the target channel estimation result.

[0237] As a possible implementation, the sensing reference signal is generated according to the frequency-domain reference signal, and the frequency-domain reference signal includes multiple frequency-domain samples; The processor 1010 performs frequency-domain channel estimation on the frequency-domain received signal to obtain an intermediate channel estimation result, specifically: Determine the target frequency-domain samples carrying the reference signal from the multiple frequency-domain samples in the frequency-domain reference signal; Perform frequency-domain channel estimation on the frequency-domain received signal according to the conjugate of the sampling values of the target frequency-domain samples in the frequency-domain reference signal to obtain the intermediate channel estimation result.

[0238] As a possible implementation, the processor 1010 performs time-domain channel estimation on the intermediate channel estimation result to obtain the target channel estimation result. Specifically, based on the FFT length, an IFFT transform is performed on the intermediate channel estimation result to obtain the target channel estimation result.

[0239] As a possible implementation, the target channel estimation result includes multiple time-domain samples; the processor 1010 performs identifying the distance between the sensing target and the sensing device according to the target channel estimation result. Specifically, among the multiple time-domain samples of the target channel estimation result, the target time-domain samples belonging to the sensing target are determined; according to the arrangement order of the target time-domain samples in the target channel estimation result, the time delay of the sensing target is determined; according to the time delay of the sensing target, the distance between the sensing target and the sensing device is determined.

[0240] As a possible implementation, the processor 1010 performs determining the time delay of the sensing target according to the arrangement order of the target time-domain samples in the target channel estimation result. Specifically, the subcarrier spacing SCS between multiple subcarriers within the occupied bandwidth of the sensing reference signal is obtained; according to the SCS and N S , the intermediate frequency sampling interval is determined; according to the product of the intermediate frequency sampling interval and the arrangement order, the time delay of the sensing target is determined.

[0241] As a possible implementation, the processor 1010 performs determining the distance between the sensing target and the sensing device according to the time delay of the sensing target. Specifically, according to the product of the speed of light and the time delay, the distance between the sensing target and the sensing device is determined.

[0242] It should be noted here that the sensing device provided in the embodiments of the present application can implement all the method steps implemented by the above Figures 2 to 5 method embodiments, and can achieve the same technical effects. The same parts and beneficial effects as those in the method embodiments in this embodiment will not be specifically described herein.

[0243] Corresponding to the method for identifying a sensing target provided in the above Figures 2 to 5 embodiment, the present application also provides a device for identifying a sensing target. Since the device for identifying a sensing target provided in the embodiments of the present application corresponds to the method for identifying a sensing target provided in the above Figures 2 to 5 embodiment, the implementation manners of the method for identifying a sensing target are also applicable to the device for identifying a sensing target provided in the embodiments of the present application, and will not be described in detail in the embodiments of the present application.

[0244] To implement the above embodiments, the present application also proposes a device for identifying a sensing target.

[0245] Figure 11It is a schematic structural diagram of an identification device for a sensing target provided by an embodiment of the present application.

[0246] As shown in Figure 11 the figure, the identification device 1100 for the sensing target can be applied to a sensing device, including: a sending unit 1110, a detecting unit 1120, a processing unit 1130, and an identifying unit 1140.

[0247] Among them, the sending unit 1110 is used to send a sensing reference signal to the communication and sensing environment; wherein, the comb factor of the sensing reference signal is greater than a set value, and the OFDM symbols in the sensing reference signal include a first number N S of time-domain samples, and the cyclic prefix in the sensing reference signal includes a second number N CP of time-domain samples.

[0248] The detecting unit 1120 is used to detect the communication and sensing environment to obtain a sensing echo signal, where the sensing echo signal is a signal reflected by the sensing reference signal through a sensing target in the communication and sensing environment.

[0249] The processing unit 1130 is used to perform radio frequency preprocessing on the sensing echo signal to obtain a first baseband signal, and delete the first frontmost and last N CP time-domain samples of the first baseband signal to obtain a second baseband signal.

[0250] The identifying unit 1140 is used to identify the distance between the sensing target in the communication and sensing environment and the sensing device based on the second baseband signal.

[0251] As a possible implementation, the sensing reference signal is generated by the following units:

[0252] An obtaining unit is used to obtain the comb factor configured for the sensing reference signal; wherein, the comb factor is greater than a set value;

[0253] A first generating unit is used to generate a frequency-domain reference sequence according to the frequency spectrum range used by the sensing device, and map the frequency-domain reference sequence into a frequency-domain reference signal according to the comb factor;

[0254] A second generating unit is used to generate a time-domain baseband signal according to the frequency-domain reference signal and add a cyclic prefix to the time-domain baseband signal; wherein, the OFDM symbols in the time-domain baseband signal include N S time-domain samples, and the cyclic prefix contains N CP time-domain samples;

[0255] A mixing unit is used to perform upmixing on the time-domain baseband signal after adding the cyclic prefix to obtain the sensing reference signal.

[0256] As a possible implementation manner, the second generation unit is specifically configured to: increase the power of the frequency-domain reference signal according to the comb factor to obtain an adjusted frequency-domain reference signal; perform IFFT transformation on the adjusted frequency-domain reference signal to obtain a time-domain baseband signal.

[0257] As a possible implementation manner, the recognition unit 1140 is specifically configured to: perform channel estimation on the second baseband signal to obtain a target channel estimation result; determine the distance between the sensing target and the sensing device according to the target channel estimation result.

[0258] As a possible implementation manner, the recognition unit 1140 is specifically configured to: according to determine the FFT length; perform FFT transformation on the second baseband signal according to the FFT length to obtain a frequency-domain received signal; perform frequency-domain channel estimation on the frequency-domain received signal to obtain an intermediate channel estimation result; perform time-delay domain channel estimation on the intermediate channel estimation result to obtain a target channel estimation result.

[0259] As a possible implementation manner, the sensing reference signal is generated according to the frequency-domain reference signal, and the frequency-domain reference signal includes multiple frequency-domain samples; the recognition unit 1140 is specifically configured to: determine target frequency-domain samples carrying the reference signal from the multiple frequency-domain samples in the frequency-domain reference signal; perform frequency-domain channel estimation on the frequency-domain received signal according to the conjugate of the sampling values of the target frequency-domain samples in the frequency-domain reference signal to obtain an intermediate channel estimation result.

[0260] As a possible implementation manner, the recognition unit 1140 is specifically configured to: perform IFFT transformation on the intermediate channel estimation result based on the FFT length to obtain a target channel estimation result.

[0261] As a possible implementation manner, the target channel estimation result includes multiple time-domain samples; the recognition unit 1140 is specifically configured to: determine target time-domain samples belonging to the sensing target from the multiple time-domain samples in the target channel estimation result; determine the time delay of the sensing target according to the arrangement order of the target time-domain samples in the target channel estimation result; determine the distance between the sensing target and the sensing device according to the time delay of the sensing target.

[0262] As a possible implementation manner, the recognition unit 1140 is specifically configured to: obtain the subcarrier spacing SCS between multiple subcarriers within the occupied bandwidth of the sensing reference signal; according to SCS and N S , determine the intermediate frequency sampling interval; determine the time delay of the sensing target according to the product of the intermediate frequency sampling interval and the arrangement order.

[0263] As a possible implementation manner, the recognition unit 1140 is specifically configured to: determine the distance between the sensing target and the sensing device according to the product of the speed of light and the time delay.

[0264] It should be noted here that the recognition device for perception targets provided in the embodiments of the present application can implement all the method steps implemented in the above Figures 2 to 5 method embodiments, and can achieve the same technical effects. The same parts and beneficial effects as those in the method embodiments will not be specifically described herein.

[0265] It should be noted that the division of units in the embodiments of the present application is illustrative, only a logical function division, and there may be other division methods in actual implementation. In addition, the functional units in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0266] If the above integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network-side device, etc.) or a processor to execute all or part of the steps of the methods in the embodiments of the present application. The aforementioned storage medium includes: USB flash drives, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks, or optical disks, etc., which can store program codes.

[0267] On the other hand, the embodiments of the present application also provide a processor-readable storage medium, and the processor-readable storage medium stores a computer program, and the computer program is used to cause the processor to execute the present application Figures 2 to 5 any of the methods shown in the embodiments.

[0268] Among them, the above processor-readable storage medium can be any available medium or data storage device that the processor can access, including but not limited to magnetic memories (such as floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO), etc.), optical memories (such as CDs, DVDs, BDs, HVDs, etc.), and semiconductor memories (such as ROM, EPROM, EEPROM, non-volatile memories (NANDFLASH), solid-state drives (SSD)).

[0269] To implement the above embodiments, the present application also proposes a computer program product.

[0270] The computer program product includes a computer program, which when executed by a processor implements the method shown in any embodiment of the present application. Figures 2 to 5 Any of the methods shown in the embodiments.

[0271] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of an all-hardware embodiment, an all-software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memories and optical memories, etc.) containing computer-usable program code.

[0272] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, and the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer-executable instructions. These computer-executable instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the functions specified in Figure 1 One process or multiple processes and / or blocks Figure 1 One block or multiple blocks.

[0273] These processor-executable instructions can also be stored in a processor-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the processor-readable memory generate a manufactured article including an instruction device that implements the functions specified in Figure 1 One process or multiple processes and / or blocks Figure 1 One block or multiple blocks.

[0274] These processor-executable instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are performed on the computer or other programmable device to generate a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 One process or multiple processes and / or blocks Figure 1 One block or multiple blocks.

[0275] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these modifications and variations.

Claims

1. A recognition method for a perceived target, characterized in that, Applied to a sensing device, including: Send a sensing reference signal to the synesthesia environment; wherein, the comb factor of the sensing reference signal is greater than a set value, and the OFDM symbols in the sensing reference signal include a first number N S of time-domain samples, and the cyclic prefix in the sensing reference signal includes a second number N CP of time-domain samples; Detecting the integrated sensing and communication environment to obtain a sensing echo signal, where the sensing echo signal is a signal reflected by a sensing target in the integrated sensing and communication environment from the sensing reference signal; Perform RF preprocessing on the sensed echo signal to obtain a first baseband signal, and delete the first first and last N CP time-domain samples of the first baseband signal to obtain a second baseband signal; Based on the second baseband signal, identifying the distance between the sensing target in the integrated sensing and communication environment and the sensing device.

2. The method according to claim 1, wherein The sensing reference signal is generated by the following steps: Obtaining a comb factor configured for the sensing reference signal; where the comb factor is greater than a set value; Generating a frequency-domain reference sequence according to the frequency spectrum range used by the sensing device, and mapping the frequency-domain reference sequence to a frequency-domain reference signal according to the comb factor; Generate a time-domain baseband signal according to the frequency-domain reference signal, and add a cyclic prefix to the time-domain baseband signal; wherein, there are N S time-domain samples on the OFDM symbol in the time-domain baseband signal, and there are N CP time-domain samples on the cyclic prefix; Performing upmixing on the time-domain baseband signal after adding a cyclic prefix to obtain the sensing reference signal.

3. The method according to claim 2, wherein The generating of the time-domain baseband signal according to the frequency-domain reference signal includes: Increasing the power of the frequency-domain reference signal according to the comb factor to obtain an adjusted frequency-domain reference signal; Performing an IFFT transform on the adjusted frequency-domain reference signal to obtain the time-domain baseband signal.

4. The method according to claim 1, wherein The identifying of the distance between the sensing target in the integrated sensing and communication environment and the sensing device based on the second baseband signal includes: Performing channel estimation on the second baseband signal to obtain a target channel estimation result; Identifying the distance between the sensing target and the sensing device according to the target channel estimation result.

5. The method according to claim 4, wherein The performing of channel estimation on the second baseband signal to obtain a target channel estimation result includes: According to the above-mentioned determine the FFT length; Performing an FFT transform on the second baseband signal according to the FFT length to obtain a frequency-domain received signal; Performing frequency-domain channel estimation on the frequency-domain received signal to obtain an intermediate channel estimation result; Performing time-delay domain channel estimation on the intermediate channel estimation result to obtain the target channel estimation result.

6. The method according to claim 5, characterized in that, The sensing reference signal is generated according to a frequency-domain reference signal, and the frequency-domain reference signal includes a plurality of frequency-domain samples; The performing of frequency-domain channel estimation on the frequency-domain received signal to obtain an intermediate channel estimation result includes: Determining target frequency-domain samples carrying the reference signal from the plurality of frequency-domain samples in the frequency-domain reference signal; Performing frequency-domain channel estimation on the frequency-domain received signal according to the conjugate of the sampling values of the target frequency-domain samples in the frequency-domain reference signal to obtain an intermediate channel estimation result.

7. The method according to claim 5, wherein The performing of time-delay domain channel estimation on the intermediate channel estimation result to obtain the target channel estimation result includes: Performing an IFFT transform on the intermediate channel estimation result based on the FFT length to obtain the target channel estimation result.

8. The method according to claim 4, wherein The target channel estimation result includes a plurality of time-domain samples; The identifying of the distance between the sensing target and the sensing device according to the target channel estimation result includes: Determining target time-domain samples belonging to the sensing target from the plurality of time-domain samples of the target channel estimation result; Determining the time delay of the sensing target according to the arrangement position of the target time-domain samples in the target channel estimation result; Determining the distance between the sensing target and the sensing device according to the time delay of the sensing target.

9. The method according to claim 8, wherein Determining the time delay of the sensing target according to the arrangement position of the target time-domain sample in the target channel estimation result includes: Obtaining the subcarrier spacing SCS between multiple subcarriers within the occupied bandwidth of the sensing reference signal; Based on the SCS and the N S , determine the intermediate frequency sampling interval; Determining the time delay of the sensing target according to the product of the intermediate frequency sampling interval and the arrangement position.

10. The method according to claim 8, characterized in that Determining the distance between the sensing target and the sensing device according to the time delay of the sensing target includes: Determining the distance between the sensing target and the sensing device according to the product of the speed of light and the time delay.

11. A sensing device, characterized in that, Including a memory, a transceiver, and a processor; The memory is used to store computer programs; the transceiver is used to transmit and receive data under the control of the processor; the processor is used to read the computer programs in the memory and perform the following operations: Send a sensing reference signal to the synesthesia environment; wherein, the comb factor of the sensing reference signal is greater than a set value, and the OFDM symbols in the sensing reference signal include a first number N S of time-domain samples, and the cyclic prefix in the sensing reference signal includes a second number N CP of time-domain samples; Detecting the communication and sensing environment to obtain a sensing echo signal, where the sensing echo signal is a signal reflected by the sensing reference signal through a sensing target in the communication and sensing environment; Perform RF preprocessing on the perceived echo signal to obtain a first baseband signal, and delete the first frontmost and last CP N time-domain samples of the first baseband signal to obtain a second baseband signal; Identifying the distance between the sensing target and the sensing device in the communication and sensing environment based on the second baseband signal.

12. The sensing device according to claim 1, wherein The processor performs the following steps to generate a sensing reference signal: Obtaining the comb factor configured for the sensing reference signal; where the comb factor is greater than a set value; Generating a frequency-domain reference sequence according to the frequency spectrum range used by the sensing device, and mapping the frequency-domain reference sequence to a frequency-domain reference signal according to the comb factor; Generate a time-domain baseband signal according to the frequency-domain reference signal, and add a cyclic prefix to the time-domain baseband signal; wherein, the OFDM symbol in the time-domain baseband signal includes N S time-domain samples, and the cyclic prefix contains N CP time-domain samples; Performing upmixing on the time-domain baseband signal after adding a cyclic prefix to obtain the sensing reference signal.

13. The sensing device according to claim 12, wherein When the processor generates a time-domain baseband signal according to the frequency-domain reference signal, specifically: Increasing the power of the frequency-domain reference signal according to the comb factor to obtain an adjusted frequency-domain reference signal; Performing an IFFT transform on the adjusted frequency-domain reference signal to obtain the time-domain baseband signal.

14. The sensing device according to claim 11, wherein When the processor identifies the distance between the sensing target and the sensing device in the communication and sensing environment based on the second baseband signal, specifically: Performing channel estimation on the second baseband signal to obtain a target channel estimation result; Identifying the distance between the sensing target and the sensing device according to the target channel estimation result.

15. The sensing device according to claim 14, characterized in that, When the processor performs channel estimation on the second baseband signal to obtain a target channel estimation result, specifically: According to the said determine the FFT length; Performing an FFT transform on the second baseband signal according to the FFT length to obtain a frequency-domain received signal; Performing frequency-domain channel estimation on the frequency-domain received signal to obtain an intermediate channel estimation result; Performing time-delay domain channel estimation on the intermediate channel estimation result to obtain the target channel estimation result.

16. The sensing device according to claim 15, characterized in that, The sensing reference signal is generated according to a frequency-domain reference signal, and the frequency-domain reference signal includes multiple frequency-domain samples; When the processor performs frequency-domain channel estimation on the frequency-domain received signal to obtain an intermediate channel estimation result, specifically: Determining target frequency-domain samples carrying reference signals from the multiple frequency-domain samples in the frequency-domain reference signal; Perform frequency-domain channel estimation on the frequency-domain received signal according to the conjugate of the sampling value of the target frequency-domain sample point in the frequency-domain reference signal, to obtain an intermediate channel estimation result.

17. The sensing device according to claim 15, characterized in that, The processor performs time-delay domain channel estimation on the intermediate channel estimation result to obtain the target channel estimation result, specifically: Based on the FFT length, perform IFFT transformation on the intermediate channel estimation result to obtain the target channel estimation result.

18. The sensing device according to claim 14, wherein The target channel estimation result includes a plurality of time-domain sample points; The processor performs identifying the distance between the sensing target and the sensing device according to the target channel estimation result, specifically: Determine target time-domain sample points belonging to the sensing target from the plurality of time-domain sample points of the target channel estimation result; Determine the time delay of the sensing target according to the arrangement position of the target time-domain sample points in the target channel estimation result; Determine the distance between the sensing target and the sensing device according to the time delay of the sensing target.

19. The sensing device according to claim 18, wherein The processor performs determining the time delay of the sensing target according to the arrangement position of the target time-domain sample points in the target channel estimation result, specifically: Obtain the subcarrier spacing SCS between a plurality of subcarriers within the occupied bandwidth of the sensing reference signal; Based on the SCS and the N S , determine the intermediate frequency sampling interval; Determine the time delay of the sensing target according to the product of the intermediate frequency sampling interval and the arrangement position.

20. The sensing device according to claim 18, wherein The processor performs determining the distance between the sensing target and the sensing device according to the time delay of the sensing target, specifically: Determine the distance between the sensing target and the sensing device according to the product of the speed of light and the time delay.

21. An identification device for perceiving a target, characterized in that, Applied to a sensing device, it includes: A transmitting unit, configured to transmit a sensing reference signal to a communication and sensing environment; wherein, a comb factor of the sensing reference signal is greater than a set value, and a first number N of time-domain samples are included on an OFDM symbol in the sensing reference signal, and a second number N of time-domain samples are included on a cyclic prefix in the sensing reference signal; S CP ​​ A detection unit, configured to detect the communication and sensing environment to obtain a sensing echo signal, where the sensing echo signal is a signal reflected by the sensing reference signal through a sensing target in the communication and sensing environment; A processing unit, configured to perform radio frequency preprocessing on the sensed echo signal to obtain a first baseband signal, and delete the first frontmost and the last CP N time domain samples of the first baseband signal to obtain a second baseband signal; An identification unit, configured to identify the distance between a sensing target in the communication and sensing environment and the sensing device based on the second baseband signal.

22. A processor-readable storage medium, characterized in that, The processor-readable storage medium stores a computer program, and the computer program is used to cause the processor to execute the method for identifying a sensing target according to claims 1 to 10.

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