Method, device and storage medium for determining telepathic detection result

Abstract

The method, device, communication device and storage medium provided by the embodiments of the present disclosure relate to the field of communication, and determine a sensing detection result. The method comprises the following steps: determining an uplink channel estimation result of an uplink stage and a sensing frequency domain sending signal and a sensing frequency domain receiving signal of a downlink stage in at least one running period; determining the sensing detection result according to the uplink channel estimation result, the sensing frequency domain sending signal and the sensing frequency domain receiving signal of the at least one running period; one running period comprises an uplink stage and a downlink stage; the sensing frequency domain receiving signal is determined by demodulating a back echo signal, and the back echo signal is a signal reflected by a terminal after an integrated signal sent by a network device in the downlink stage; the integrated signal is determined by modulating the sensing frequency domain sending signal. The embodiments of the present disclosure can effectively eliminate the inherent radar multipath interference of the terminal.

Description

Technical Field

[0001] This disclosure relates to the field of communication technology, and more specifically, to a method, apparatus, communication device, and computer-readable storage medium for determining the results of a sensing detection. Background Technology

[0002] With the rapid development of communication and information technology, in order to achieve deep integration of communication and sensing services in fields such as 6G, vehicle-to-everything (V2X), drone networking, and military applications, it is necessary to conduct in-depth research on communication and sensing technologies (also known as integrated communication and radar technologies).

[0003] The multipath effect, which is prevalent in various wireless communication scenarios, inevitably leads to multipath interference in the detection results, resulting in more false targets in sensor detection and increasing the difficulty of radar detection.

[0004] Related technologies, such as radar clutter processing schemes and false target elimination schemes, cannot effectively eliminate the inherent radar multipath interference of environmental targets. This problem has hindered the development and promotion of sensing detection technology. Summary of the Invention

[0005] This disclosure provides a method, apparatus, communication, and computer-readable storage medium for determining sensing detection results, which can solve the aforementioned problems of the prior art. The technical solution is as follows:

[0006] According to one aspect of the present disclosure, a method for determining a sensing detection result is provided, the method comprising:

[0007] Determine the uplink channel estimation results for the uplink phase and the sensing frequency domain transmitted signal and sensing frequency domain received signal for the downlink phase in at least one operating cycle;

[0008] The sensing detection result is determined based on the uplink channel estimation result of at least one operating cycle, the sensing frequency domain transmitted signal, and the sensing frequency domain received signal;

[0009] One operating cycle includes an upward phase and a downward phase;

[0010] The frequency domain received signal is determined by demodulating the echo signal, which is the integrated signal sent by the network device in the downlink phase and reflected by the terminal.

[0011] The integrated signal is determined by modulating the frequency domain transmitted signal of the inductive signal.

[0012] According to another aspect of the present disclosure, an apparatus for determining a sensing detection result is provided, the apparatus comprising:

[0013] The processing module is used to determine the uplink channel estimation results for the uplink phase and the sensing frequency domain transmitted signal and sensing frequency domain received signal for the downlink phase in at least one operating cycle.

[0014] The processing module is also used to determine the sensing detection result based on the uplink channel estimation result, the sensing frequency domain transmitted signal, and the sensing frequency domain received signal for at least one operating cycle;

[0015] One operating cycle includes an upward phase and a downward phase;

[0016] The frequency domain received signal is determined by demodulating the echo signal, which is the signal reflected by the terminal from the integrated signal sent by the device in the downlink phase.

[0017] The integrated signal is determined by modulating the frequency domain transmitted signal of the inductive signal.

[0018] According to another aspect of the present disclosure, a communication device is provided, the communication device including a memory, a processor and a computer program stored in the memory, the processor executing the computer program to implement the method for determining the sensing detection result provided in the above aspect.

[0019] According to another aspect of the present disclosure, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the method for determining a sensing detection result provided in the above aspect.

[0020] The beneficial effects of the technical solutions provided in this disclosure are:

[0021] By analyzing the generation logic and transmission process of the echo signal, it is determined that by further processing the echo signal in conjunction with the propagation channel estimation on the basis of the existing integrated signal, the inherent radar multipath interference of environmental targets can be effectively eliminated. In order to obtain the channel estimation of one-way propagation, the embodiments of this disclosure subdivide each operating cycle into uplink and downlink stages, and obtain the channel estimation of each operating cycle by receiving the uplink signal in the uplink stage. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below.

[0023] Figure 1 This is a schematic diagram of the architecture of a communication system provided in an embodiment of this disclosure;

[0024] Figure 2a A flowchart illustrating a method for determining a sensing detection result provided in an embodiment of this disclosure;

[0025] Figure 2b A schematic diagram of the operating cycle provided for embodiments of this disclosure;

[0026] Figure 2c This is a schematic diagram illustrating the process of transmitting an integrated signal, receiving echoes, and performing radar processing through a transmitter (Tx) of a network device, as provided in an embodiment of this disclosure.

[0027] Figure 3a A schematic diagram of a radar image obtained using a method for determining the results of a sensing detection, which is provided for related technologies.

[0028] Figure 3b A schematic diagram of a radar image obtained by a method for determining the results of a sensing detection provided in an embodiment of this disclosure;

[0029] Figure 4 A schematic diagram of a device for determining the result of a sensing detection provided in an embodiment of this disclosure;

[0030] Figure 5 This is a schematic diagram of the structure of a communication device provided in an embodiment of this disclosure. Detailed Implementation

[0031] The embodiments of this disclosure are described below with reference to the accompanying drawings. It should be understood that the embodiments described below with reference to the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of this disclosure, and do not constitute a limitation on the technical solutions of the embodiments of this disclosure.

[0032] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” and “the” used herein may also include the plural forms. It should be further understood that the terms “comprising” and “including” as used in embodiments of this disclosure mean that the corresponding feature can be implemented as the presented feature, information, data, step, operation, element, and / or component, but do not exclude implementation as other features, information, data, step, operation, element, component, and / or combinations thereof supported by the art. It should be understood that when we say that an element is “connected” or “coupled” to another element, the one element can be directly connected or coupled to the other element, or it can mean that the one element and the other element are connected through an intermediate element. Furthermore, “connected” or “coupled” as used herein can include wireless connection or wireless coupling. The term “and / or” as used herein indicates at least one of the items defined by the term; for example, “A and / or B” can be implemented as “A,” or as “B,” or as “A and B.”

[0033] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0034] First, let's introduce and explain several terms used in this disclosure:

[0035] A channel is a medium for signal transmission and can be divided into wired channels and wireless channels. Wired channels include open wires, symmetrical cables, coaxial cables, and optical fibers; wireless channels include ground wave propagation, shortwave ionospheric reflection, VHF or microwave line-of-sight relay, satellite relay, and various scattering channels. When a signal propagates in a wireless channel, the received signal is not only obtained through a single direct path but also includes reflected, diffracted, and data signals arriving through different paths. This phenomenon is called multipath propagation, and the channel is called a multipath channel.

[0036] Orthogonal Frequency Division Multiplexing (OFDM) technology enables high-speed parallel transmission of serial data through frequency division multiplexing. It has good resistance to multipath fading and can support multi-user access.

[0037] A cyclic prefix (CP) is formed by copying the signal from the tail of an OFDM symbol to the head. There are two main types of CP lengths: normal cyclic prefix and extended cyclic prefix. The cyclic prefix can be correlated with other multipath component information to obtain complete information. Furthermore, the cyclic prefix can be used for time prediction and frequency synchronization.

[0038] The Discrete Fourier Transform (DFT) is a Fourier transform that takes a discrete form in both the time and frequency domains, transforming a signal's time-domain sampled data into its frequency-domain sampled data in the Discrete Fourier Transform (DTFT). Formally, the sequences at both ends of the transform (in the time and frequency domains) are of finite length, but in practice, both sets of sequences should be considered as principal value sequences of a discrete periodic signal. Even when performing the DFT on a finite-length discrete signal, it should be viewed as a periodic extension of that signal. In practical applications, the Fast Fourier Transform (FFT) is typically used to calculate the DFT.

[0039] The method, apparatus, communication, and computer-readable storage medium for determining sensing detection results provided in this disclosure are intended to solve the aforementioned technical problems of the prior art.

[0040] The following description of several exemplary embodiments illustrates the technical solutions of this disclosure and the technical effects produced by these solutions. It should be noted that the following embodiments can be referenced, learned from, or combined with each other. Identical terms, similar features, and similar implementation steps in different embodiments will not be repeated.

[0041] Figure 1 This is a schematic diagram of the architecture of a communication system provided in an embodiment of the present disclosure. The communication system 100 includes a terminal 101 and a network device 102.

[0042] In some embodiments, terminal 101 includes, but is not limited to, at least one of the following: mobile phone, wearable device, Internet of Things device, car with communication function, smart car, tablet computer, computer with wireless transceiver function, virtual reality (VR) terminal device, augmented reality (AR) terminal device, wireless terminal device in industrial control, wireless terminal device in self-driving, wireless terminal device in remote medical surgery, wireless terminal device in smart grid, wireless terminal device in transportation safety, wireless terminal device in smart city, and wireless terminal device in smart home.

[0043] In some embodiments, network device 102 may include access network device.

[0044] In some embodiments, the access network device may be a node or device that connects a terminal to a wireless network, and may include at least one of the following in a 5G communication system: an evolved Node B (eNB), a next-generation eNB (ng-eNB), a next-generation Node B (gNB), a node B (NB), a home node B (HNB), a home evolved node B (HeNB), a wireless backhaul device, a radio network controller (RNC), a base station controller (BSC), a base transceiver station (BTS), a base band unit (BBU), a mobile switching center, a base station in a 6G communication system, an open RAN, a cloud RAN, a base station in other communication systems, and an access node in a wireless fidelity (WiFi) system, but is not limited thereto.

[0045] In some embodiments, the technical solutions of this disclosure can be applied to the Open RAN architecture. In this case, the interfaces between or within network devices involved in the embodiments of this disclosure can be transformed into internal interfaces of Open RAN. The processes and information interactions between these internal interfaces can be implemented by software or programs.

[0046] In some embodiments, the access network device may be composed of a central unit (CU) and a distributed unit (DU). The CU may also be called a control unit. The CU-DU structure can separate the protocol layer of the network device. Some of the protocol layer functions are centrally controlled by the CU, while the remaining part or all of the protocol layer functions are distributed in the DU and centrally controlled by the CU. However, this is not the only possibility.

[0047] It is understood that the communication system described in this disclosure is for the purpose of more clearly illustrating the technical solutions of this disclosure, and does not constitute a limitation on the technical solutions proposed in this disclosure. As those skilled in the art will know, with the evolution of system architecture and the emergence of new business scenarios, the technical solutions proposed in this disclosure are also applicable to similar technical problems.

[0048] The following embodiments of this disclosure can be applied to Figure 1The communication system 100 shown, or a part thereof, but not limited to it. Figure 1 The entities shown are illustrative; a communication system may include... Figure 1 All or part of the main body, or may include Figure 1 Other entities besides the main body, the number and form of each entity are arbitrary, the connection relationship between the entities is illustrative, the entities may not be connected or may be connected, and the connection can be in any way, it can be a direct connection or an indirect connection, it can be a wired connection or a wireless connection.

[0049] The embodiments disclosed herein can be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G new radio (NR), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Futuregeneration radio access (FX), Global System for Mobile communications (GSM), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), and IEEE 802.20, Ultra-Wideband (UWB), Bluetooth (a registered trademark), Public Land Mobile Network (PLMN) networks, Device-to-Device (D2D) systems, Machine-to-Machine (M2M) systems, Internet of Things (IoT) systems, Vehicle-to-Everything (V2X) systems, systems utilizing other communication methods, and next-generation systems built upon them, etc. Furthermore, multiple systems can be combined (e.g., a combination of LTE or LTE-A with 5G).

[0050] This application provides a method for determining the results of a sensing detection, which is applied to network devices, such as... Figure 2a As shown, the method includes:

[0051] S201. Determine the uplink channel estimation results for the uplink phase and the inductive frequency domain transmitted signal and inductive frequency domain received signal for the downlink phase in at least one operating cycle.

[0052] In some embodiments, the number of operation cycles is N, which is the number of radar processing estimation symbols. f .

[0053] Each operating cycle of this embodiment is further divided into an uplink phase and a downlink phase. In the uplink phase, the terminal sends an uplink signal containing a training sequence or pilot to the network device. In the downlink phase, the network device sends a downlink integrated communication radar signal (also known as an integrated signal) to the terminal and receives the echo signal reflected by the integrated signal through the terminal.

[0054] In some embodiments, the duration of the uplink phase and the downlink phase within each operating cycle is the same.

[0055] In some embodiments, the total number of OFDM subcarriers is N, the basic symbol period is T, and the cyclic prefix period is T. CP The symbol periods are T sym And T sym =T+T CP Circular prefix length N CP =NT CP / T, the subcarrier spacing is Δf=1 / T.

[0056] Please see Figure 2b The figure illustrates an exemplary schematic diagram of the operating cycle provided by an embodiment of the present disclosure. As shown, the duration of both the uplink and downlink phases in this embodiment of the present disclosure is T. sym During the uplink phase, the terminal sends an uplink signal containing training sequences or pilots to the network device, which then performs uplink channel estimation and communication reception. During the downlink phase, the network device sends an integrated signal to the terminal, receives echo signals, and performs radar processing.

[0057] In one embodiment, the uplink signal sent by the terminal is an OFDM symbol containing pilots or training, thereby enabling the network device to perform uplink channel estimation using existing channel estimation methods.

[0058] In some embodiments, the uplink channel estimation result obtained by the network device is the channel time-domain response of the one-way propagation in the corresponding uplink phase.

[0059] In one embodiment, the one-way propagation channel is a Rician channel.

[0060] It should be understood that one-way propagation refers to the transmission of a signal from the first communication device to the second communication device, while two-way propagation refers to the transmission of a signal from the first communication device to the second communication device and back to the first communication device. This can be understood as follows: when the first communication device refers to the terminal, the second communication device refers to the network device; conversely, when the first communication device refers to the network device, the second communication device refers to the terminal. Correspondingly, one-way propagation in the uplink phase refers to the transmission of a signal from the terminal to the network device.

[0061] It should be noted that, for ease of derivation and understanding, the embodiments of this disclosure employ ideal estimation of the uplink channel.

[0062] The network device in this embodiment of the present disclosure sends an integrated downlink signal to the terminal and receives an echo signal in each downlink phase.

[0063] Please see Figure 2c The exemplary embodiment of this disclosure provides a schematic diagram of the process of transmitting an integrated signal, receiving an echo signal, and performing radar processing through the transmitter (Tx) of a network device. As shown in the figure, for the μth operating cycle, it includes:

[0064] Binary data is converted into a transductive frequency domain symbol (also known as a RadCom frequency domain symbol) through quadrature amplitude modulation (QAM) or phase amplitude modulation (PAM). Understandably, X μ [] represents the frequency domain symbol of the k-th subcarrier transmitted in the μ-th operating cycle;

[0065] The syn-sensing frequency domain symbol is converted from serial to parallel (S / P) to obtain the first syn-sensing frequency domain symbol vector (i.e., the syn-sensing frequency domain transmitted signal) X. μ =[X μ [0], μ [1],…, μ [N-1] T Where the superscript T indicates the transposed budget;

[0066] One syn-sensory frequency domain transmission signal is used to obtain the syn-sensory detection result, while the other syn-sensory frequency domain transmission signal is mapped to the time domain through the Inverse Discrete Fourier Transform (IDFT). It can be understood that the corresponding syn-sensory time domain symbol vector is x = IDFT(X), where IDFT in the formula indicates the IDFT operation.

[0067] The μ-th syn-sensory time-domain transmitted signal (also known as the time-domain sample of the μ-th downlink OFDM symbol) of the syn-sensory time-domain symbol vector is represented as:

[0068]

[0069] Where, N f This represents the number of operating cycles.

[0070] The process of transmitting the downlink integrated signal is completed by modulating the time-domain transmitted signal and sending the resulting signal as an integrated signal into the channel.

[0071] In some embodiments, modulation includes performing parallel-to-serial conversion (P / S) on the syn-sensory time-domain transmitted signal, adding a cyclic prefix CP, and performing digital-to-analog conversion (D / A), etc.

[0072] After sending the integrated signal to the terminal, the network device further receives the arriving signal (i.e., the echo signal of the integrated signal transmitted by the terminal) after passing through the channel.

[0073] The received echo signal is demodulated to obtain the second inductive frequency domain symbol vector (i.e., the inductive frequency domain received signal). Y μ [] represents the echo frequency domain term of the k-th subcarrier received in the μ-th operating cycle;

[0074] In one embodiment, demodulation includes performing analog-to-digital conversion (A / D) on the echo signal, removing the CP, and then mapping it to the frequency domain via discrete Fourier transform (DFT) through S / P.

[0075] The obtained syn-sensory frequency domain received signal is also divided into two paths: one path is used for radar processing, and the other path is used for channel equalization to compensate for channel distortion.

[0076] In one embodiment, the equalization can employ a minimum mean-squared error (MMSE) or zero-forcing (ZF) equalizer;

[0077] The MMSE equilibrium coefficient is:

[0078]

[0079] The ZF equilibrium coefficient is:

[0080]

[0081] in, H represents the channel frequency domain response coefficient of the k-th subcarrier in one-way propagation. * [] indicates the conjugate operation on H[k], εb N and N0 are the power spectral density of the signal per bit energy and the additive white Gaussian noise (AWGN), respectively.

[0082] The equalized signal can be represented as the IDFT result of multiplying the received signal in the inductive frequency domain by the equalization coefficients:

[0083]

[0084] S202. Determine the sensing detection result based on the uplink channel estimation result of at least one operating cycle, the sensing frequency domain transmitted signal, and the sensing frequency domain received signal.

[0085] In this embodiment of the present disclosure, for each operating cycle, the uplink channel estimation result of the operating cycle can be determined based on the received uplink signal of that operating cycle. When the uplink phase and the downlink phase are within the coherence time, it can be assumed that the channel information in the uplink phase and the downlink phase has not changed. Due to the reciprocity of the channel, in the adjacent downlink phase within the same operating cycle, the integrated signal undergoes two approximately identical channel propagations. Based on this, this embodiment of the present disclosure obtains the single-path uplink channel estimation result obtained by uplink channel estimation based on the received uplink signal, and then obtains the channel estimation result of the echo signal after two-path propagation. Thus, the echo signal is processed using the two-path channel estimation results and the integrated signal, effectively eliminating the inherent radar multipath interference of the terminal.

[0086] This embodiment of the disclosure analyzes the generation logic and transmission process of the echo signal and determines that, based on the existing integrated signal, further processing of the echo signal by combining propagation channel estimation can effectively eliminate the inherent radar multipath interference of the terminal. In order to obtain the propagation channel estimation, this embodiment of the disclosure subdivides each operating cycle into uplink and downlink stages. By receiving the uplink signal in the uplink stage and parsing the uplink signal, the uplink channel estimation result of each operating cycle is obtained.

[0087] Based on the above embodiments, as an optional embodiment, the sensing detection result is determined according to the uplink channel estimation result of at least one operating cycle, the sensing frequency domain transmitted signal, and the sensing frequency domain received signal, including:

[0088] Based on the uplink channel estimation results of the operating cycle, determine the frequency domain response of the echo channel for the operating cycle;

[0089] The sensing detection result is determined based on the echo channel frequency domain response, the sensing frequency domain transmitted signal, and the sensing frequency domain received signal for at least one operating cycle.

[0090] In some embodiments, the inductive frequency domain transmitted signal refers to the OFDM frequency domain symbol in the transmitted integrated signal.

[0091] In some embodiments, the frequency domain received signal refers to the frequency domain symbol in the received echo signal.

[0092] In some embodiments, OFDM frequency domain symbols refer to frequency domain sampling of OFDM symbols.

[0093] In some embodiments, the echo channel frequency domain response is the channel frequency domain response of the echo signal after two propagations.

[0094] In some embodiments, the channel frequency domain response refers to the frequency domain sampling of the channel impulse response; similarly, the channel time domain response refers to the time domain sampling of the channel impulse response.

[0095] From the above Figure 2c As can be seen, in the process of transmitting the integrated signal during the downlink phase of each operating cycle, the present invention retains one sensing frequency domain transmission signal and one sensing frequency domain reception signal during the process of receiving the echo signal. Thus, based on the echo channel frequency domain response, sensing frequency domain transmission signal and sensing frequency domain reception signal of each operating cycle, the sensing detection results of the terminal in multiple operating cycles are determined.

[0096] Based on the above embodiments, as an optional embodiment, the uplink channel estimation result includes the time-domain response of the channel during one-way propagation.

[0097] Based on the uplink channel estimation results of the operating cycle, the frequency domain response of the echo channel for the operating cycle is determined, including:

[0098] Perform a DFT operation on the channel time domain response of the single-pass propagation of the running cycle to obtain the channel frequency domain response of the single-pass propagation of the running cycle.

[0099] The echo channel frequency response of the operating cycle is determined based on the channel frequency response of the single-pass propagation during the operating cycle.

[0100] It should be noted that the uplink signal in this disclosure may include a training sequence or pilot, thereby enabling channel estimation based on the training sequence or pilot using existing channel estimation methods to determine the channel time-domain response of one-way propagation during the runtime period. , where h μ [n] represents the channel time-domain response coefficient of the nth channel in the μth operating cycle;

[0101] It is worth noting that, since the network device needs to detect the terminal during the downlink phase, its signal undergoes two propagations. To ensure radar ranging performance, the total propagation time cannot exceed the duration of the cyclic prefix of the OFDM symbol, which is the multipath channel length N of this embodiment. ch Satisfying N ch <N cp / 2, Maximum transmission delay

[0102] After obtaining the time-domain response of the one-way propagation channel, the frequency-domain response of the one-way propagation channel can be obtained by mapping it to the frequency domain using the DFT (which can be expressed as...). ).

[0103] Since the echo signal propagates in two passes, the channel frequency response coefficient of the kth subcarrier of the echo channel frequency response can be determined based on the channel frequency response of the subcarrier in the downlink phase in two single passes.

[0104] In some embodiments, the echo channel frequency domain response of the running cycle can be obtained by performing a linear convolution operation on the time domain responses of the two channels.

[0105] The channel frequency response coefficient H of the k-th subcarrier in the echo channel frequency response of the μ-th operating cycle of this disclosure embodiment. r,μ [k] can be represented as:

[0106] H r,μ [k]=DFT{h μ [n]*h μ [n] = (H μ [k] 2 k = 0, 1, ..., N-1

[0107] That is, based on the time-domain response of the channel during a single-pass propagation of the operating cycle, the frequency-domain response of the echo channel during the operating cycle is determined, including:

[0108] Channel time-domain response to one-way propagation during the operating cycle Perform a DFT operation to obtain the channel frequency domain response H of the one-way propagation during the runtime. μ [k];

[0109] Based on the channel frequency domain response H of the single-pass propagation of the operating cycle μ [k], determines the echo channel frequency domain response H during the running period. r,μ [k].

[0110] In some embodiments, each inductive frequency domain transmitted signal includes OFDM frequency domain symbols for all subcarriers in the corresponding downlink phase. The OFDM frequency domain symbol for the k-th subcarrier in the μ-th downlink phase can be represented as X. μ [k].

[0111] In some embodiments, the frequency domain response of each echo channel includes the channel frequency domain response coefficients of all subcarriers in the corresponding downlink phase. The frequency domain response of the echo channel in the μ-th downlink phase can be expressed as H. r,μ Accordingly, the channel frequency response coefficient of the kth subcarrier of the echo channel frequency response can be expressed as H r,μ [].

[0112] In some embodiments, each inductive frequency domain received signal includes the echo frequency domain term Y of all subcarriers in the corresponding downlink phase. μ Each echo frequency domain term includes a first sub-term related to the OFDM frequency domain symbol of the corresponding subcarrier, a second sub-term related to the channel frequency domain response coefficient of the corresponding subcarrier, and a third sub-term related to the sensing detection result of the terminal.

[0113] Specifically, when the uplink and downlink cycles are within the coherence time, the channel information can be considered unchanged within the uplink and downlink cycles. Due to the reciprocity of the channel, in adjacent downlink phases, the integrated signal undergoes two approximately identical channel propagations. Therefore, the received signal in the inductive frequency domain corresponding to the OFDM frequency domain symbol of the nth subcarrier in the μth downlink phase can be expressed as:

[0114] y μ [] = μ,ec h o []*h μ []*h μ []+η μ [],

[0115] n=0,1,…,N-1; μ=0,1,…,N f -1;

[0116] Where, η μ [] represents additive white Gaussian noise (AWGN), h μ [] represents the time-domain response coefficient of the nth subcarrier in the μth downlink phase, and * represents the linear convolution operation.

[0117] x μ,ec h o [] represents the time-domain sample x of the OFDM frequency domain symbol of the nth subcarrier in the μth downlink phase. μ The reflected echo term of [] can be expressed by the following formula:

[0118]

[0119] Among them, L and f D To detect the echo delay and Doppler frequency shift of the terminal;

[0120]

[0121] f D =2vf c / c;

[0122] f c Where c is the carrier frequency and c is the speed of light;

[0123] R and v are the distance and relative speed between the terminal and the execution entity of this disclosure, respectively, and are parameters to be determined;

[0124] PRI is the pulse repetition interval.

[0125] In one embodiment, PRI = 2T sym .

[0126] Based on the above embodiments, as an optional embodiment, the sensing detection results of the terminal in multiple operating cycles are determined according to the echo channel frequency domain response, the sensing frequency domain transmitted signal, and the sensing frequency domain received signal of at least one operating cycle, including:

[0127] Based on the OFDM frequency domain symbol of the subcarrier in the downlink inductive frequency domain transmitted signal and the channel frequency domain response coefficient of the corresponding subcarrier in the echo channel frequency domain response, the first and second sub-terms of the echo frequency domain term of the corresponding subcarrier are eliminated to obtain the third sub-term of the echo frequency domain term of the corresponding subcarrier in the downlink phase.

[0128] The sensing detection result is determined based on the third sub-item corresponding to each subcarrier in at least one downlink phase.

[0129] By using the above x μ,echo Substituting the expression for [n] into the expression for the echo received signal, and simultaneously combining it with the aforementioned channel frequency domain response coefficient H... r,μ The expression for [k] can be used to obtain the expression for the echo frequency domain term Y of the k-th subcarrier in the μ-th downlink phase. μ [k]:

[0130]

[0131] As can be seen from the above expressions, each echo frequency domain term in this embodiment includes three sub-terms, wherein the first sub-term is X. μ [k], the second sub-item is (H) μ [k]) 2 The third sub-item is

[0132] Further analysis of the third sub-term of each echo frequency domain term reveals that the third sub-term includes the distance factor. and velocity factor

[0133] It can be seen that the distance factor is related to the subcarrier k and the echo delay L of the terminal;

[0134] Velocity factor, operating period μ, and terminal Doppler frequency offset f D Related.

[0135] Therefore, in this embodiment of the disclosure, a quotient matrix can be established, in which the divisor of each element is the product of the OFDM frequency domain symbol of the subcarrier in the inductive frequency domain transmitted signal of a subcarrier in a downlink phase and the channel frequency domain response coefficient of the subcarrier in the echo channel frequency domain response, and the divisor is the echo frequency domain term of the subcarrier in the downlink phase, thereby eliminating the first and second sub-terms in the echo frequency domain term and obtaining the third sub-term of the echo frequency domain term of the subcarrier in the downlink phase;

[0136] Specifically, in this embodiment, the symbols are arranged in a matrix form with each complete OFDM frequency domain symbol as a column, resulting in the following matrix:

[0137]

[0138]

[0139]

[0140] To prevent distortion, M X Update all elements that are 0 to 1, then perform matrix element division to obtain the quotient matrix M. D =M Y / (M X ·M H ), where (·) represents element-wise matrix multiplication, and the elements of the quotient matrix can be represented as:

[0141]

[0142] Since the OFDM frequency domain symbol, channel frequency domain response coefficient, and echo frequency domain term of each subcarrier in each operating cycle can be determined, the element values ​​of the above quotient matrix can also be determined. By combining all the element values ​​of the quotient matrix, the distance information and relative velocity information can be obtained.

[0143] Based on the above embodiments, as an optional embodiment, the terminal's sensing detection result is determined according to the third sub-item corresponding to each subcarrier in each downlink phase, including:

[0144] Perform an inverse discrete Fourier transform (IDFT) operation on the third term corresponding to each subcarrier in the downlink phase to obtain the fourth term corresponding to each subcarrier in the downlink phase.

[0145] Perform a Discrete Fourier Transform (DFT) operation on the fourth sub-term corresponding to each subcarrier in each downlink phase to obtain the fifth sub-term corresponding to each subcarrier in each downlink phase.

[0146] The sensing detection result is determined based on the fifth sub-item corresponding to at least one subcarrier in at least one downlink phase.

[0147] Specifically, the embodiments of this disclosure can be applied to the aforementioned quotient matrix M. D Perform an IDFT operation on N elements in each column to obtain the quotient matrix M. D The elements in the matrix are updated to the fourth sub-item corresponding to the subcarrier to extract the distance information of the terminal. Then, N is performed on each row of the matrix after the IDFT operation. f The DFT operation is performed on each element, and the elements in the matrix are further updated to the fifth sub-item corresponding to the subcarrier to extract the speed information of the terminal. The absolute value of the elements of the matrix obtained after the DFT operation can be used to obtain the three-dimensional radar display image, and then obtain the sensor detection result.

[0148] The method for determining the results of sensory detection used in this disclosure can detect targets at a maximum distance of r. max =Tc / 2, maximum relative velocity is v max =±c / (8f) c T sym ), where c and f c Let c be the speed of light and c be the carrier frequency, respectively. The distance resolution of this method is c / (2NΔf), and the velocity resolution is c / (4NΔf). f f c T sym ).

[0149] Assuming a single target user exists in the environment at a distance of 20m and a relative speed of 5m / s, the uplink channel estimation results adopt ideal channel estimation results. The simulation parameters are: 1620 subcarriers, 560 cumulative symbols, 5GHz carrier frequency, 60kHz subcarrier spacing, 1.2μs CP period, 97.2MHz bandwidth, 179.9m maximum operating range, ±419.5m / s maximum detection speed, 1.54m range resolution, and 1.5m / s velocity resolution. Figure 3a and Figure 3b These are schematic diagrams of range-velocity radar images obtained by the relevant technologies and this disclosure, respectively. Figure 3aIt can be seen that after passing through two multipath channels, the integrated echo signal exhibits multiple multipath false target peaks on the range axis in the range-velocity radar image after radar processing. And from... Figure 3b As can be seen, after the multipath interference cancellation processing proposed in this disclosure, the multipath false target peaks in the radar image are cleared, leaving only the required communication target detection peaks, whose distance and relative velocity are accurate. It can be seen that the embodiments of this disclosure can effectively eliminate radar multipath interference of communication target users in radar images.

[0150] This disclosure provides an apparatus for determining the result of a sensing detection, such as... Figure 4 As shown, the device may include: a processing module 401, used to determine the uplink channel estimation result of the uplink phase and the sensing frequency domain transmitted signal and sensing frequency domain received signal of the downlink phase in at least one operating cycle;

[0151] The processing module 401 is also used to determine the sensing detection result based on the uplink channel estimation result of at least one operating cycle, the sensing frequency domain transmitted signal and the sensing frequency domain received signal;

[0152] One operating cycle includes an upward phase and a downward phase;

[0153] The frequency domain received signal is determined by demodulating the echo signal, which is the signal reflected by the terminal after the integrated signal sent by the device in the downlink phase.

[0154] The integrated signal is determined by modulating the transmitted signal in the frequency domain of the inductive signal.

[0155] The apparatus of this disclosure embodiment can execute the method provided in this disclosure embodiment, and the implementation principle is similar. The actions performed by each module in the apparatus of each disclosure embodiment correspond to the steps in the method of each disclosure embodiment. For detailed functional descriptions of each module of the apparatus, please refer to the descriptions in the corresponding methods shown above, which will not be repeated here.

[0156] This disclosure provides a communication device including a memory, a processor, and a computer program stored in the memory. The processor executes the computer program to implement the steps of a method for determining the results of a sensing detection. Compared with related technologies, this device can achieve the following: by analyzing the generation logic and transmission process of the echo signal, it is determined that by further combining the propagation channel estimation with the existing integrated signal to process the echo signal, the inherent radar multipath interference of the terminal can be effectively eliminated. In order to obtain the propagation channel estimation, this disclosure divides each operating cycle into uplink and downlink phases. By receiving the uplink signal in the uplink phase and parsing the uplink signal, the channel estimation for each operating cycle is obtained.

[0157] In one alternative embodiment, a communication device is provided, such as Figure 5 As shown, Figure 5 The communication device 4000 shown includes a processor 4001 and a memory 4003. The processor 4001 and the memory 4003 are connected, for example, via a bus 4002. Optionally, the communication device 4000 may further include a transceiver 4004, which can be used for data interaction between the communication device and other communication devices, such as sending and / or receiving data. It should be noted that in practical applications, the transceiver 4004 is not limited to one type, and the structure of this communication device 4000 does not constitute a limitation on the embodiments of this disclosure.

[0158] Processor 4001 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with this disclosure. Processor 4001 may also be a combination that implements computational functions, such as including one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.

[0159] Bus 4002 may include a pathway for transmitting information between the aforementioned components. Bus 4002 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. Bus 4002 can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 5 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0160] The memory 4003 may be ROM (Read Only Memory) or other types of static storage devices capable of storing static information and instructions, RAM (Random Access Memory) or other types of dynamic storage devices capable of storing information and instructions, or EEPROM (Electrically Erasable Programmable Read Only Memory), CD-ROM (Compact Disc Read Only Memory) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media, other magnetic storage devices, or any other medium capable of carrying or storing computer programs and capable of being read by a computer, without limitation herein.

[0161] The memory 4003 is used to store computer programs that execute embodiments of the present disclosure, and is controlled by the processor 4001 to execute them. The processor 4001 is used to execute the computer programs stored in the memory 4003 to implement the steps shown in the foregoing method embodiments.

[0162] This disclosure provides a computer-readable storage medium storing a computer program, which, when executed by a processor, can implement the steps and corresponding content of the aforementioned method embodiments.

[0163] This disclosure also provides a computer program product, including a computer program that, when executed by a processor, can implement the steps and corresponding content of the aforementioned method embodiments.

[0164] The terms “first,” “second,” “third,” “fourth,” “1,” “2,” etc. (if present) in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in a sequence other than that shown in the figures or text.

[0165] It should be understood that although arrows indicate various operation steps in the flowcharts of the embodiments of this disclosure, the order in which these steps are implemented is not limited to the order indicated by the arrows. Unless explicitly stated herein, in some implementation scenarios of the embodiments of this disclosure, the implementation steps in each flowchart can be executed in other orders as required. Furthermore, some or all of the steps in each flowchart may include multiple sub-steps or multiple stages based on the actual implementation scenario. Some or all of these sub-steps or stages can be executed at the same time, and each sub-step or stage can also be executed at different times. In scenarios where execution times differ, the execution order of these sub-steps or stages can be flexibly configured as required, and the embodiments of this disclosure do not limit this.

[0166] The above are merely optional implementation methods for some implementation scenarios of this disclosure. It should be noted that for those skilled in the art, other similar implementation methods based on the technical concept of this disclosure, without departing from the technical concept of this disclosure, also fall within the protection scope of the embodiments of this disclosure.

Claims

1. A method for determining a sensing detection result, the method being executed by a network device, characterized in that, include: Determine the uplink channel estimation results for the uplink phase and the sensing frequency domain transmitted signal and sensing frequency domain received signal for the downlink phase in at least one operating cycle; The sensing detection result is determined based on the uplink channel estimation result of at least one operating cycle, the sensing frequency domain transmitted signal, and the sensing frequency domain received signal; One operating cycle includes an upward phase and a downward phase; The frequency domain received signal is determined by demodulating the echo signal, which is the integrated signal sent by the network device in the downlink phase and reflected by the terminal. The integrated signal is determined by modulating the frequency domain transmitted signal of the inductive signal.

2. The method according to claim 1, characterized in that, The step of determining the sensing detection result based on the uplink channel estimation result of at least one operating cycle, the sensing frequency domain transmitted signal, and the sensing frequency domain received signal includes: Based on the uplink channel estimation results of the operating cycle, the echo channel frequency domain response of the operating cycle is determined, and the echo channel frequency domain response is the channel frequency domain response of the echo signal after two propagations. The sensing detection result is determined based on the echo channel frequency domain response, the sensing frequency domain transmitted signal, and the sensing frequency domain received signal for at least one operating cycle.

3. The method according to claim 2, characterized in that, The received frequency domain signal in the inductive frequency domain includes the echo frequency domain terms of all subcarriers in the corresponding downlink phase; The echo frequency domain term includes: The first sub-item associated with the frequency domain symbol of the corresponding subcarrier in Orthogonal Frequency Division Multiplexing (OFDM); The second sub-term related to the channel frequency domain response coefficients of the corresponding subcarrier, and A third sub-item related to the sensing detection results of the terminal.

4. The method according to claim 3, characterized in that, The inductive frequency domain transmitted signal includes OFDM frequency domain symbols for all subcarriers in the corresponding downlink phase; The echo channel frequency domain response includes the channel frequency domain response coefficients of all subcarriers in the corresponding downlink phase; The determination of the sensing detection result based on the echo channel frequency domain response, the sensing frequency domain transmitted signal, and the sensing frequency domain received signal for at least one operating cycle includes: Based on the OFDM frequency domain symbol of the subcarrier in the downlink frequency domain transmitted signal and the channel frequency domain response coefficient of the corresponding subcarrier in the echo channel frequency domain response, the first and second sub-terms of the echo frequency domain term of the corresponding subcarrier are eliminated to obtain the third sub-term of the echo frequency domain term of the corresponding subcarrier in the downlink phase. The sensing detection result is determined based on the third sub-item corresponding to each subcarrier in at least one downlink phase.

5. The method according to claim 4, characterized in that, The determination of the sensing detection result based on the third sub-item corresponding to each subcarrier in each downlink phase includes: Perform an inverse discrete Fourier transform (IDFT) operation on the third sub-term corresponding to each subcarrier in the downlink phase to obtain the fourth sub-term corresponding to each subcarrier in the downlink phase. Perform a Discrete Fourier Transform (DFT) operation on the fourth sub-item corresponding to each subcarrier in each downlink phase to obtain the fifth sub-item corresponding to each subcarrier in each downlink phase. The sensing detection result is determined based on the fifth sub-item corresponding to at least one subcarrier in at least one downlink phase.

6. The method according to any one of claims 3-5, characterized in that, The third sub-term of the echo frequency domain term includes a distance factor and a velocity factor; The distance factor is related to the echo delay of the subcarrier and the terminal; The speed factor is related to the operating cycle and the Doppler frequency offset of the terminal.

7. The method according to claim 2, characterized in that, The uplink channel estimation results include the time-domain response of the channel during one-way propagation.

8. The method according to claim 7, characterized in that, The step of determining the echo channel frequency domain response of the operating period based on the uplink channel estimation result of the operating period includes: Perform a DFT operation on the channel time domain response of the single-pass propagation of the aforementioned operating period to obtain the channel frequency domain response of the single-pass propagation of the aforementioned operating period. The echo channel frequency response of the operating cycle is determined based on the channel frequency response of the single-pass propagation of the operating cycle.

9. The method according to claim 8, characterized in that, The channel time-domain response includes the channel time-domain response coefficients of the multipath channel length; the multipath channel length does not exceed half the length of the cyclic prefix.

10. The method according to any one of claims 1-8, characterized in that, The duration of both the uplink and downlink phases is the duration of the symbol period.

11. A device for determining the result of a sensory detection, characterized in that, include: The processing module is used to determine the uplink channel estimation results for the uplink phase and the sensing frequency domain transmitted signal and sensing frequency domain received signal for the downlink phase in at least one operating cycle. The processing module is also used to determine the sensing detection result based on the uplink channel estimation result of at least one operating cycle, the sensing frequency domain transmitted signal and the sensing frequency domain received signal; One operating cycle includes an upward phase and a downward phase; The frequency domain received signal is determined by demodulating the echo signal, and the echo signal is the signal reflected by the terminal from the integrated signal sent by the device in the downlink phase. The integrated signal is determined by modulating the frequency domain transmitted signal of the inductive signal.

12. A communication device, comprising a memory, a processor, and a computer program stored in the memory, characterized in that, The processor executes the computer program to implement the steps of the method according to any one of claims 1-10.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1-10.

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