Signal processing method, transmitting end device and receiving end device

Abstract

The invention provides a signal processing method, transmitting end equipment and receiving end equipment. The method comprises the following steps: performing modulation processing on a first signal based on a first signal modulation mode and a second signal modulation mode to obtain a second signal; wherein the first signal modulation mode comprises OFDM (Orthogonal Frequency Division Multiplexing), and the second signal modulation mode comprises signal modulation modes except the OFDM. The invention provides two different signal modulation modes, namely the second signal modulation mode (such as a signal modulation mode except OFDM) and the first signal modulation mode (such as OFDM) which are sequentially used for modulating the first signal to obtain the second signal, so that the advantages of the modulation modes except OFDM are fully utilized, the signal transmission performance is improved, and the signal transmission efficiency is improved. Moreover, the implementation of the second signal modulation mode in MIMO becomes possible through the related processing of OFDM.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and more specifically, to a signal processing method, a transmitting end device and a receiving end device. Background Art

[0002] With the development of wireless communications, new application requirements are constantly increasing, and many new scenarios and services need to be supported. Therefore, for mobile communication networks, it is necessary not only to optimize the communication process, but also to improve the signal processing capabilities to improve signal transmission performance. Summary of the invention

[0003] The present application provides a signal processing method, a transmitting end device and a receiving end device. The following introduces various aspects involved in the present application.

[0004] In a first aspect, a signal processing method is provided, comprising: modulating a first signal based on a first signal modulation method and a second signal modulation method to obtain a second signal; wherein the first signal modulation method includes OFDM, and the second signal modulation method includes a signal modulation method other than OFDM.

[0005] In a second aspect, a signal processing method is provided, comprising: demodulating a second signal based on a demodulation method corresponding to a first signal modulation method and a demodulation method corresponding to a second signal modulation method to obtain a first signal; wherein the first signal modulation method includes OFDM, and the second signal modulation method includes a signal modulation method other than OFDM.

[0006] According to a third aspect, a transmitting end device is provided, comprising: a processing unit, configured to modulate a first signal based on a first signal modulation method and a second signal modulation method to obtain a second signal; wherein the first signal modulation method comprises OFDM, and the second signal modulation method comprises a signal modulation method other than OFDM.

[0007] In a fourth aspect, a receiving end device is provided, comprising: a processing unit, configured to demodulate a second signal based on a demodulation method corresponding to a first signal modulation method and a demodulation method corresponding to a second signal modulation method to obtain a first signal; wherein the first signal modulation method includes OFDM, and the second signal modulation method includes a signal modulation method other than OFDM.

[0008] In a fifth aspect, a sending end device is provided, comprising a transceiver, a memory and a processor, wherein the memory is used to store programs, and the processor is used to call the programs in the memory and control the transceiver to receive or send signals so that the sending end device executes the method described in the first aspect.

[0009] In the sixth aspect, a receiving device is provided, comprising a transceiver, a memory and a processor, wherein the memory is used to store programs, and the processor is used to call the programs in the memory and control the transceiver to receive or send signals so that the receiving device executes the method described in the second aspect.

[0010] In a seventh aspect, a device is provided, comprising a processor, configured to call a program from a memory so that the device executes a method as described in any one of the first aspect or the second aspect.

[0011] In an eighth aspect, a chip is provided, comprising a processor for calling a program from a memory so that a device equipped with the chip executes the method described in the first aspect or the second aspect.

[0012] In a ninth aspect, a computer-readable storage medium is provided, on which a program is stored, wherein the program enables a computer to execute the method as described in the first aspect or the second aspect.

[0013] In a tenth aspect, a computer program product is provided, comprising a program, wherein the program enables a computer to execute the method as described in the first aspect or the second aspect.

[0014] In an eleventh aspect, a computer program is provided, wherein the computer program enables a computer to execute the method as described in the first aspect or the second aspect.

[0015] The present application provides two different signal modulation methods, namely a second signal modulation method (for example, a signal modulation method other than OFDM) and a first signal modulation method (for example, OFDM), which are used in sequence to modulate the first signal to obtain a second signal, thereby making full use of the advantages of modulation methods other than OFDM, which is beneficial to signal transmission performance, and through the relevant processing of OFDM, it is possible to implement the second signal modulation method in multiple input multiple output (MIMO). BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 2 is a diagram showing an example of a system architecture of a wireless communication system applicable to an embodiment of the present application.

[0017] Figure 2 Schematic diagram of wave transmission.

[0018] Figure 3 Schematic diagram of the signal processing flow at the sending end.

[0019] Figure 4 Schematic diagram of the signal processing flow at the receiving end.

[0020] Figure 5A schematic flowchart of a signal processing method according to an embodiment of the present application.

[0021] Figure 6 This is a signal processing flow at the transmitting end applicable to the embodiment of the present application.

[0022] Figure 7 Schematic diagram of the application scenario of OTFS-MIMO.

[0023] Figure 8 A schematic flowchart of a signal processing method according to an embodiment of the present application.

[0024] Fig. 9 A schematic diagram of the structure of a sending end device according to an embodiment of the present application.

[0025] Fig.10 A schematic diagram of the structure of a receiving device according to an embodiment of the present application.

[0026] Fig.11 A schematic diagram of a device for communication according to an embodiment of the present application. DETAILED DESCRIPTION

[0027] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0028] Wireless communication system

[0029] Figure 1 1 is an example diagram of the system architecture of a wireless communication system 100 to which an embodiment of the present application can be applied. The wireless communication system 100 may include a network device 110 and a terminal device 120. The network device 110 may be a device that communicates with the terminal device 120. The network device 110 may provide network coverage for a specific geographical area, and may communicate with the terminal device 120 located in the coverage area. The terminal device 120 may access a network, such as a wireless network, through the network device 110. Optionally, the wireless communication system 100 may also include other network entities such as a network controller and a mobility management entity, which is not limited in the embodiment of the present application.

[0030] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: fifth generation (5G) system or new radio (NR), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), etc. The technical solutions provided in the present application can also be applied to future communication systems, such as the sixth generation mobile communication system, satellite communication system, etc.

[0031] In the embodiments of the present application, the terminal device may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device. The terminal device in the embodiments of the present application may be a device that provides voice and / or data connectivity to a user, and may be used to connect people, objects and machines, such as a handheld device with wireless connection function, a vehicle-mounted device, etc. The terminal device may also be a mobile phone, a tablet computer, a laptop, a PDA, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. Optionally, the terminal device may be used to act as a base station. For example, the terminal device may act as a dispatching entity that provides sidelink signals between terminal devices in vehicle to everything (V2X) or device to device (D2D). For example, a cellular phone and a car communicate with each other using a sidelink signal. Cellular phones and smart home devices communicate without relaying communication signals through a base station.

[0032] In an embodiment of the present application, a network device may be a device for communicating with a terminal device. The network device may be an access network device or a wireless access network device. For example, the network device may be a base station. The base station may broadly cover the following various names, or may be replaced with the following names, for example: Node B (NodeB), evolved NodeB (evolved NodeB, eNB), next generation NodeB (next generation NodeB, gNB), relay station, transmission point (transmitting and receiving point, TRP), transmission point (transmitting point, TP), master station (MeNB), auxiliary station (SeNB), multi-standard wireless (MSR) node, home base station, network controller, access node, wireless node, access point (access point, AP), transmission node, transceiver node, baseband unit (base band unit, BBU), remote radio unit (remote radio unit, RRU), active antenna unit (active antenna unit, AAU), radio head (remote radiohead, RRH), central unit (central unit, CU), distributed unit (distributed unit, DU), positioning node, etc. The base station may be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. The base station may also refer to a communication module, a modem or a chip used to be arranged in the aforementioned device or apparatus. The base station may also be a mobile switching center and a device to device D2D, vehicle-to-everything (V2X), a device that performs the base station function in machine-to-machine (M2M) communications, a network-side device in a 6G network, and a device that performs the base station function in future communication systems. The base station may support networks with the same or different access technologies. The embodiments of the present application do not limit the specific technologies and specific device forms adopted by the network equipment. The base station may support networks with the same or different access technologies. The embodiments of the present application do not limit the specific technologies and specific device forms adopted by the network equipment.

[0033] In addition, the base station can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move according to the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device for communicating with another base station.

[0034] The network equipment and terminal equipment can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on the water surface; they can also be deployed on aircraft, balloons and satellites in the air. The embodiments of the present application do not limit the scenarios in which the network equipment and terminal equipment are located.

[0035] It should be understood that all or part of the functions of the communication device in the embodiments of the present application may also be implemented through software functions running on hardware, or through virtualization functions instantiated on a platform such as a cloud platform.

[0036] The orthogonal frequency division multiplexing (OFDM) system transforms the time domain into the frequency domain through Fourier. The receiver is decoupled when performing multipath delay estimation and Doppler estimation. In other words, the traditional OFDM receiver assumes that the Doppler frequency caused by high-speed motion within an OFDM symbol can be ignored. The impact of the Doppler frequency is mainly reflected in the phase rotation caused by the introduction of Doppler frequency shift between OFDM symbols. In the OFDM system, carrier frequency offset (CFO) compensation can be used to reduce the impact of Doppler frequency shift, but it is still difficult to effectively reduce the composite Doppler frequency shift of all multipaths.

[0037] This problem can be explained from the principle of the Doppler effect. The frequency f, wavelength λ, and wave speed v satisfy:

[0038] v = fλ;

[0039] Among them, the frequency f can be regarded as the number of waves emitted by the wave source per second, and the wavelength λ can be regarded as the periodic length of the wave in the propagation medium. When the wavelength is constant, the Doppler shift is the change in signal frequency caused by the relative motion between the transmitter and the receiver, which can be expressed by the following formula:

[0040]

[0041] Among them, Δf is the frequency shift, v is the relative speed (positive value means moving away, negative value means approaching), c is the speed of light, and f is the carrier frequency of the signal (also referred to as carrier frequency).

[0042] When there are multipaths, different signals arrive at the receiving end at different angles. Due to the change in the incident angle, the moving speed changes. For example, the moving speed corresponding to path 1 is v1, and the moving speed corresponding to path 2 is v2. Then the corresponding Doppler frequency shifts are:

[0043]

[0044] In the case of multipath, the Doppler frequency shift varies with the time delay. Therefore, from the perspective of the delay Doppler domain, the channel characteristics can be more accurately described. For this reason, the embodiment of the present application proposes a MIMO system under the Doppler delay spectrum.

[0045] In OFDM systems, carrier frequency offset compensation is often used to mitigate the impact of Doppler shift, but it is still difficult to effectively mitigate the composite Doppler shift of all multipaths.

[0046] like Figure 2 As shown, the transmitter emits a sine wave, the starting point of the wave is A, the end point is B, the length of the wave in space is D, the frequency is f0, and the target moves at a radial speed v r Move towards the sending end.

[0047] As the target moves toward the launch end, the time Δt required for point B to contact the target and point A to contact the target is:

[0048]

[0049] When point A touches the target, the distance of point B relative to the target is the length D′ of the reflected sine wave, which is calculated as:

[0050] -

[0051] Among them, c―vr represents the speed of the electromagnetic wave relative to the target after being emitted from point B. The length of the sine wave after reflection is less than the length of the sine wave before reflection, but the number of waves remains unchanged. If the frequency after reflection is f′0, then:

[0052] -

[0053] When the speed of light is much greater than the target moving speed, the ratio of the Doppler shift f′0 to the carrier frequency f0 can be obtained by the ratio of the moving speed to the speed of light. In the case of multipath, the Doppler shift varies with the time delay, so the channel characteristics can be more accurately described from the perspective of the delay Doppler domain.

[0054] For traditional OFDM signals, the time-frequency resource position of the signal received by the terminal device is fixed. The terminal device only needs to find and receive the channel state indication reference signal (CSI-RS) at the indicated time-frequency position. Based on the existing prior information, the extra phase introduced by the inconsistent time-frequency resources is eliminated (in some cases, this phase may be very small), and the precoding matrix indication can be calculated and fed back. The transmission and reception process of the MIMO system in the wireless communication system is as follows: Figure 3 and Figure 4 shown.

[0055] in, Figure 3 The signal processing flow corresponds to the sending end, Figure 4 The signal processing flow corresponds to the receiving end. The OFDM processing at the transmitting end includes operations such as inverse fast Fourier transform (IFFT) and adding cyclic profix (CP). Similarly, the OFDM processing at the receiving end includes operations such as removing CP and fast Fourier transform (FFT).

[0056] The signal is mapped to the delay-Doppler domain for transmission. Since the channels in the delay and Doppler domains are convolved on the transmitted signals, the receiver does not know where to receive the target when it does not know the channel information. Since the received signals are time domain signals, due to the influence of the channel, these received signals are the convolution of the channel and the transmitted signal. The signals received at each moment contain the transmitted signals at different moments in the past, the transmitted signals of different antennas, and the contents of the channel. When processing from the time domain, there is no way to obtain MIMO slices in the frequency domain like OFDM. That is to say, in OFDM processing, by performing FFT on the received signal, the received signal is converted into a MIMO signal with only the current frequency. As long as two-dimensional processing is used, the MIMO influence can be decoupled to obtain the transmitted signal of each antenna, or the signal transmitted by transmit diversity. To this end, it is necessary to consider how to apply the delay-Doppler domain to MIMO.

[0057] Processing the signal in the delay-Doppler spectrum can more accurately describe the channel characteristics, retain the delay-Doppler characteristics of the signal, and have the ability to perform MIMO processing in the frequency domain. From the perspective of MIMO-time-frequency, the processing in the MIMO-delay-Doppler domain is transformed into a two-level series mode, that is, the series mode of the MIMO-frequency domain and the delay-Doppler domain, thereby achieving dimensionality reduction of the MIMO system under the delay-Doppler spectrum, making the combination of MIMO and delay-Doppler spectrum possible.

[0058] In the embodiment of the present application, OFDM or other signal modulation methods in the time-frequency domain are referred to as the first signal modulation method, and the signal modulation method other than OFDM is referred to as the second signal modulation method. For example, the second signal modulation method may be a signal modulation method associated with orthogonal time-frequency space (OTFS), or other delay-Doppler signal modulation methods. The signal modulation method in the embodiment of the present application refers to, for example, a multi-carrier modulation method. The "modulation" described in the embodiment of the present application should be broadly understood as a "processing" of a signal.

[0059] The present application provides two different signal modulation methods, namely a second signal modulation method (for example, a signal modulation method other than OFDM) and a first signal modulation method (for example, OFDM), which are used in sequence to modulate the first signal to obtain a second signal, thereby making full use of the advantages of modulation methods other than OFDM, which is beneficial to improving signal transmission performance, and through the relevant processing of OFDM, it is possible to realize the second signal modulation method in MIMO.

[0060] Combine the following Figure 5 , the embodiments of the present application are introduced in detail.

[0061] Figure 5 A flowchart of a wireless signal processing method provided in an embodiment of the present application. Figure 5 The method 500 shown may be executed by a transmitting end. The transmitting end may be a terminal device, in which case the receiving end may be a network device; or the transmitting end may be a network device, in which case the receiving end may be a terminal device. The terminal device may be, for example, Figure 1 The terminal device 120 shown in FIG. 1 , the network device may be, for example, Figure 1 The network device 110 shown in FIG.

[0062] See also Figure 5 In step 510, the first signal is modulated based on the first signal modulation mode and the second signal modulation mode to obtain the second signal. The first signal modulation mode includes OFDM, and the second signal modulation mode includes a signal modulation mode other than OFDM.

[0063] In an embodiment of the present application, the first signal can be modulated based on the second signal modulation method, and then the obtained signal can be modulated based on the first signal modulation method. By modulating the signal based on the second signal modulation method, the advantages brought by the second signal modulation method can be utilized (for example, when the second signal modulation method is a signal modulation method related to OTFS or a signal modulation method in other delay-Doppler domains, it can more accurately describe the channel characteristics and retain the delay-Doppler characteristics of the signal), and continuing to modulate the signal based on the first signal modulation method can achieve dimensionality reduction, so that the signal can be implemented in MIMO.

[0064] In some implementations, in step 510, symplectic finite Fourier processing and OFDM processing may be performed sequentially on the first signal to obtain a second signal.

[0065] The first signal may be, for example, a two-dimensional array of delay domain and Doppler domain obtained based on serial-to-parallel conversion. That is, before performing symplectic finite Fourier processing, the signal needs to be serial-to-parallel converted in order to obtain an input signal that meets the requirements of symplectic finite Fourier processing. Fig.11 As shown in the figure, by performing serial-to-parallel conversion on the signals x(10,10), ..., x(10,2), x(10,1), ..., x(1,10), ... x(1,2), x(1,1), we can obtain a two-dimensional array in the delay domain and the Doppler domain as the input signal for the symplectic finite Fourier processing:

[0066] x(1,1);

[0067] x(1,2);

[0068] ……;

[0069] x(1,10);

[0070] x(10,1);

[0071] x(10,2);

[0072] ……;

[0073] x(10,10).

[0074] Hereinafter, how to sequentially perform symplectic finite Fourier processing and OFDM processing on the first signal to obtain the second signal is described in detail. As an example, the process of sequentially performing symplectic finite Fourier processing and OFDM processing on the first signal to obtain the second signal may include:

[0075] Step 1-1, performing symplectic finite Fourier processing on the first signal to obtain a discrete time-frequency domain signal;

[0076] Step 1-2, performing OFDM processing on a discrete time-frequency domain signal corresponding to each frequency domain position in a plurality of frequency domain positions to obtain an OFDM signal corresponding to each frequency domain position;

[0077] Step 1-3: Obtain a second signal based on multiple OFDM signals corresponding to multiple frequency domain positions.

[0078] Taking the first signal as a delay Doppler signal and the second signal as a time domain signal as an example, in the process of processing the first signal to obtain the second signal by using the above steps 1-1 to 1-3, the first signal in the delay Doppler domain is converted into a discrete time-frequency domain signal by symplectic finite Fourier processing, and the discrete time-frequency domain signal corresponding to each frequency domain position is converted into a corresponding OFDM signal by OFDM processing, and then based on the ODFM signals corresponding to multiple frequency domain positions, a continuous time domain signal, i.e., the second signal, is formed. OFDM here can refer to the process of Fourier processing (e.g., IFFT).

[0079] In the embodiment of the present application, the Fourier processing at the transmitting end can be considered as an IFFT process, and the Fourier processing at the receiving end can be considered as an FFT process, and the FFT process is the inverse process of the IFFT process. In addition, the symplectic finite Fourier processing at the transmitting end can be considered as an ISFFT process, and the symplectic finite Fourier processing at the receiving end can be considered as an SFFT process, and the SFFT process is the inverse process of the ISFFT process.

[0080] The above steps 1-1, 1-2 and 1-3 are described in detail below with reference to examples.

[0081] In step 1-1, the first signal and the discrete time-frequency domain signal satisfy the following relationship:

[0082]

[0083] Among them, x(k,l) is the first signal, X(m,n) is the discrete time-frequency domain signal, k is the sequence number of the delay domain, k∈[0,M-1], l is the sequence number of the Doppler domain, l∈[0,N-1], m is the sequence number of the frequency domain, m∈[0,M-1], and n is the sequence number of the time domain, n∈[0,N-1].

[0084] Based on formula (1), the second part can be converted into a discrete time-frequency domain signal.

[0085] In step 1-2, the OFDM signal corresponding to each frequency domain position and the discrete time-frequency domain signal corresponding to each frequency domain position satisfy the following conditions:

[0086]

[0087] Among them, X(m,n) is the discrete time-frequency domain signal corresponding to the frequency domain position m, n is the sequence number of the time domain, n∈[0,N-1], m is the sequence number of the frequency domain, m∈[0,M-1], p(m,t) is the OFDM signal corresponding to the frequency domain position m, g tx (t―nT) is the shaping filter, △f is the subcarrier spacing, and T is the symbol transmission period.

[0088] Here, the signal X(m,n) corresponding to the same frequency domain position m is subjected to OFDM processing, that is, X(1,n), X(2,n), ...X(N-1,n) are subjected to OFDM processing respectively to obtain the corresponding OFDM signal of each frequency domain position m, that is:

[0089]

[0090] It should be noted that the frequency domain position is represented by the frequency domain serial number m, and the time domain position is represented by the time domain serial number n. Similarly, the delay domain and Doppler domain also have their own serial numbers k and l, respectively.

[0091] In step 1-3, the second signal and the multiple OFDM signals corresponding to the multiple frequency domain positions satisfy:

[0092]

[0093] Among them, s(t) is the second signal, m is the serial number in the frequency domain, m∈[0,M-1], p(m,t) is the OFDM signal corresponding to the frequency domain position m, △f is the subcarrier spacing, and T is the symbol transmission period.

[0094] In this way, the OFDM signal s(t) can be obtained.

[0095] In some implementations, method 500 may further include: sampling the second signal in the time domain to obtain a discrete time domain signal. For example, based on formula (3), the time is sampled to obtain a discrete time domain signal:

[0096]

[0097] Among them, s(k) is the discrete time domain signal, m is the frequency domain serial number, m∈[0,M-1], p(m,t) is the OFDM signal corresponding to the frequency domain position m, △f is the subcarrier spacing, and k is the time sequence number.

[0098] Specifically, based on the above formula (1), we can get the discrete time-frequency domain signal:

[0099]

[0100] Among them, x(k,l) is the delay-Doppler domain signal, X(m,n) is the discrete time-frequency domain signal, k is the sequence number of the delay domain, k∈[0,M-1], l is the sequence number of the Doppler domain, l∈[0,N-1], m is the sequence number of the frequency domain, m∈[0,M-1], and n is the sequence number of the time domain, n∈[0,N-1].

[0101] The discrete time-frequency domain signal in formula (1) is converted into a continuous time domain signal that can be transmitted by the transmitter:

[0102]

[0103] Among them, g tx (t) is the transmit shaping filter, Δf is the subcarrier spacing, and T is the symbol transmission period.

[0104] Replace e in formula (5) j2πmΔf(t―nT) Split into e j2πmΔft and e ―j2πmΔf(nT) ,get:

[0105]

[0106] The signal X(m,n) corresponding to the same frequency domain position m is processed by OFDM (i.e., IFFT). For each value of m, there is a p(m,t), i.e., the above formula (2):

[0107]

[0108] Then, the above signal s(t) can be expressed as:

[0109]

[0110] Furthermore, based on formula (7) and formula (2), the above formula (3) is obtained:

[0111]

[0112] Among them, in formula (3) Alternatively, it can be expressed as:

[0113] p(m,t)=IFFT(X(m,n)g tx (t―nT)) (8).

[0114] Then, s(t) can be sampled in the time domain to obtain the corresponding discrete signal s(k) to facilitate signal transmission.

[0115] Similarly, after completing the above modulation processing, it is also necessary to add a cyclic prefix before the second signal on each time domain symbol, wherein the cyclic prefix is ​​greater than the maximum transmission delay of the second signal, that is, it is necessary to satisfy the above formula T CP >τ max , where T CP is the length of the cyclic prefix, τ max is the maximum transmission delay of the second signal.

[0116] When performing resource mapping, p(m,k) can be mapped to appropriate resources, and the transmission of OTFS signals can be realized through OFDM processing. Figure 6As shown, taking carrier wave (CW) 1 and CW2 as examples, when performing resource mapping of OTFS signals, based on formula (4), the signal s(0) when k=0, the signal s(1) when k=1, the signal s(2) when k=2, etc. can be mapped to different frequency domain resources (e.g., subcarrier 0, subcarrier 1, subcarrier 2, ...) and / or different time domain resources (e.g., OFDM symbol 0, OFDM symbol 1, symbol 2, ...) in sequence.

[0117] In some scenarios, it is possible to switch between OFDM-MIMO and OTFS-MIMO. For example, Figure 7 As shown in the figure, in high-speed scenarios, OTFS needs to be enabled for frequency offset estimation. In congested traffic, cars travel at a slow speed, and OTFS-MIMO needs to be used.

[0118] In some implementations, if the transmitting end is a terminal device, that is, method 500 is executed by the terminal device, then the terminal device can receive indication information sent by the network device, where the indication information is used to indicate whether the signal modulation method of the terminal device includes the second signal modulation method.

[0119] Among them, in step 510, when the indication information indicates that the second signal debugging mode is included, the terminal device modulates the first signal based on the first signal modulation mode and the second signal modulation mode to obtain the second signal. Of course, when the indication information indicates that the second signal modulation mode is not included, the terminal device modulates the first signal based on the first signal modulation mode (in this case, the second signal modulation mode will not be used) to obtain the second signal.

[0120] The indication information may be carried in broadcast signaling, such as a master information block (MIB). In some implementations, the indication information is associated with a direction. For example, the physical broadcast signal includes 1 bit for indicating whether the signal transmitted in the current direction adopts the second signal modulation method. For another example, the indication information includes a bit string, and a plurality of bits in the bit string are respectively associated with a plurality of directions, wherein each bit is used to indicate whether the signal transmitted in the direction associated with it adopts the second signal modulation method. As an example, a bit value of 1 indicates that the signal transmitted in the associated direction adopts the second signal modulation method, and a bit value of 0 indicates that the signal transmitted in the associated direction does not adopt the second signal modulation method; or, a bit value of 0 indicates that the signal transmitted in the associated direction adopts the second signal modulation method, and a bit value of 1 indicates that the signal transmitted in the associated direction does not adopt the second signal modulation method.

[0121] If the indication information indicates that the second signal modulation method is not included, the terminal device can modulate the signal to be transmitted based on the first signal modulation method; if the indication information indicates that the second signal modulation method is included, the terminal device processes the signal based on method 500 described in the embodiment of the present application, that is, processes the first signal based on the second modulation method and the first signal modulation method in sequence to obtain the second signal.

[0122] The signals (for example, the first signal and the second signal) described in the embodiments of the present application may include, for example, a physical downlink control channel (PDCCH) signal, a physical downlink shared channel (PDSCH) signal, a physical uplink control channel (PUCCH) signal, and a physical uplink shared channel (PUSCH) signal.

[0123] Figure 8 A schematic flow chart of a wireless signal processing method provided in another embodiment of the present application is shown. Figure 8 The method 800 shown may be executed by a receiving end. The receiving end may be a terminal device, in which case the sending end may be a network device; or the receiving end may be a network device, in which case the sending end may be a terminal device. The terminal device may be, for example, Figure 1 The terminal device 120 shown in FIG. 1 , the network device may be, for example, Figure 1 The network device 110 shown in FIG.

[0124] See also Figure 8 In step 810, the second signal is demodulated based on the demodulation method corresponding to the first signal modulation method and the demodulation method corresponding to the second signal modulation method to obtain the first signal; wherein the first signal modulation method includes OFDM, and the second signal modulation method includes a signal modulation method other than OFDM (for example, an OTFS-related signal modulation method).

[0125] In some implementations, the process of demodulating the second signal based on the demodulation method corresponding to the first signal modulation method and the demodulation method corresponding to the second signal modulation method may include: performing OFDM processing and symplectic finite Fourier processing on the second signal in sequence to obtain the first signal.

[0126] In some implementations, the process of sequentially performing OFDM processing and symplectic finite Fourier processing on the second signal to obtain the first signal may include:

[0127] Step 2-1: Based on the second signal, obtain multiple OFDM signals corresponding to multiple frequency domain positions;

[0128] Step 2-2, performing OFDM processing on the OFDM signal corresponding to each time domain position in the multiple frequency domain positions to obtain a discrete time-frequency domain signal corresponding to each frequency domain position;

[0129] Step 2-3: Perform symplectic finite Fourier processing based on discrete time-frequency domain signals corresponding to multiple frequency domain positions to obtain a first signal.

[0130] For example, the second signal is a time domain signal, and the first signal is a delay Doppler signal.

[0131] In some implementations, the first signal is a two-dimensional array in the delay domain and the Doppler domain, and the method 800 may further include: performing parallel-to-serial conversion on the first signal.

[0132] In some implementations, the first signal and the discrete time-frequency domain signal satisfy:

[0133]

[0134] Among them, x(k,l) is the first signal, X(m,n) is the discrete time-frequency domain signal, k is the sequence number of the delay domain, k∈[0,M-1], l is the sequence number of the Doppler domain, l∈[0,N-1], m is the sequence number of the frequency domain, m∈[0,M-1], and n is the sequence number of the time domain, n∈[0,N-1].

[0135] In some implementations, the OFDM signal corresponding to each frequency domain position and the discrete time-frequency domain signal corresponding to each frequency domain position satisfy the following relationship:

[0136]

[0137] Among them, X(m,n) is the discrete time-frequency domain signal corresponding to the frequency domain position m, n is the sequence number of the time domain, n∈[0,N-1], m is the sequence number of the frequency domain, m∈[0,M-1], p(m,t) is the OFDM signal corresponding to the frequency domain position m, g tx (t―nT) is the shaping filter, △f is the subcarrier spacing, and T is the symbol transmission period.

[0138] In some implementations, the second signal and the multiple OFDM signals satisfy:

[0139]

[0140] Among them, s(t) is the second signal, m is the serial number in the frequency domain, m∈[0,M-1], p(m,t) is the OFDM signal corresponding to the frequency domain position m, △f is the subcarrier spacing, and T is the symbol transmission period.

[0141] In some implementations, the second signal is a continuous time domain signal, and the method 800 may further include: converting the discrete time domain signal into a continuous time domain signal.

[0142] In some implementations, the discrete time domain signal includes:

[0143]

[0144] Among them, s(k) is the discrete time domain signal, m is the frequency domain serial number, m∈[0,M-1], p(m,t) is the OFDM signal corresponding to the frequency domain position m, △f is the subcarrier spacing, and k is the time sequence number.

[0145] In some implementations, the method 800 may further include: removing a cyclic prefix before the second signal on each time domain symbol, wherein the cyclic prefix is ​​greater than a maximum transmission delay of the second signal.

[0146] In some implementations, when method 800 is executed by a network device, method 800 further includes: the network device sends indication information to the terminal device, wherein the indication information is used to indicate whether the terminal device sends an OFDM waveform or a non-OFDM waveform signal.

[0147] Among them, when the indication information indicates that the terminal device sends a signal with an OFDM waveform, the network device demodulates the second signal based on the above method to obtain the first signal; when the indication information indicates that the terminal device sends a signal with a non-OFDM waveform, the network device demodulates the received signal based on a modulation method other than OFDM.

[0148] In some implementations, the indication information is carried in broadcast signaling, for example, the broadcast signaling is MIB.

[0149] In some implementations, the indication information is associated with a signal transmission direction.

[0150] In some implementations, the indication information includes a bit string, wherein a plurality of bits in the bit string are respectively associated with a plurality of directions, wherein each bit is used to indicate whether a signal transmitted in the direction associated therewith is an OFDM waveform or a non-OFDM waveform.

[0151] It can be understood that the signal demodulation process performed by the receiving end can be regarded as the inverse process of the modulation process performed by the transmitting end. For example, taking the demodulation process of the fourth signal as an example, step 2-1 can be regarded as the inverse process of step 1-1 corresponding to the transmitting end; step 2-2 can be regarded as the inverse process of step 1-2 corresponding to the transmitting end; step 2-3 can be regarded as the inverse process of step 1-3 corresponding to the transmitting end. Among them, the Fourier processing at the transmitting end can be regarded as an IFFT process, while the Fourier processing at the receiving end can be regarded as an FFT process, and the FFT process is the inverse process of the IFFT process; the symplectic finite Fourier processing at the transmitting end can be regarded as an ISFFT process, while the symplectic finite Fourier processing at the receiving end can be regarded as an SFFT process, and the SFFT process is the inverse process of the ISFFT process. Therefore, the detailed contents of the above steps at the receiving end can refer to the aforementioned description of the transmitting end, and for the sake of brevity, they will not be repeated here.

[0152] Combination of the above Figures 1 to 8 , describes the method embodiment of the present application in detail, and the following is combined with Figures 9 to 11 , describes the device embodiment of the present application in detail. It should be understood that the description of the method embodiment corresponds to the description of the device embodiment, so the parts not described in detail can refer to the previous method embodiment.

[0153] Fig. 9 A schematic diagram of the structure of a sending end device provided in an embodiment of the present application. Fig. 9 The transmitter device 900 shown may include a processing unit 910. The processing unit 910 is used to modulate the first signal based on a first signal modulation method and a second signal modulation method to obtain a second signal; wherein the first signal modulation method includes OFDM, and the second signal modulation method includes a signal modulation method other than OFDM.

[0154] In some implementations, the second signal modulation scheme is associated with OTFS.

[0155] In some implementations, the processing unit 910 is specifically configured to: sequentially perform symplectic finite Fourier processing and OFDM processing on the first signal to obtain the second signal.

[0156] In some implementations, the first signal is a delay Doppler signal, and the second signal is a time domain signal.

[0157] In some implementations, the processing unit 910 is specifically used to: perform symplectic finite Fourier processing on the first signal to obtain a discrete time-frequency domain signal; perform OFDM processing on the discrete time-frequency domain signal corresponding to each frequency domain position in a plurality of frequency domain positions to obtain an OFDM signal corresponding to each frequency domain position; and obtain the second signal based on a plurality of OFDM signals corresponding to the plurality of frequency domain positions.

[0158] In some implementations, the first signal is a two-dimensional array in the delay domain and the Doppler domain obtained based on serial-to-parallel conversion.

[0159] In some implementations, the first signal and the discrete time-frequency domain signal satisfy the following relationship: Among them, x(k,l) is the first signal, X(m,n) is the discrete time-frequency domain signal, k is the sequence number of the delay domain, k∈[0,M-1], l is the sequence number of the Doppler domain, l∈[0,N-1], m is the sequence number of the frequency domain, m∈[0,M-1], and n is the sequence number of the time domain, n∈[0,N-1].

[0160] In some implementations, the OFDM signal corresponding to each frequency domain position and the discrete time-frequency domain signal corresponding to each frequency domain position satisfy the following relationship: Among them, X(m,n) is the discrete time-frequency domain signal corresponding to the frequency domain position m, n is the sequence number of the time domain, n∈[0,N-1], m is the sequence number of the frequency domain, m∈[0,M-1], p(m,t) is the OFDM signal corresponding to the frequency domain position m, g tx (t―nT) is the shaping filter, △f is the subcarrier spacing, and T is the symbol transmission period.

[0161] In some implementations, the second signal satisfies the following conditions with respect to the plurality of OFDM signals: Among them, s(t) is the second signal, m is the serial number in the frequency domain, m∈[0,M-1], p(m,t) is the OFDM signal corresponding to the frequency domain position m, △f is the subcarrier spacing, and T is the symbol transmission period.

[0162] In some implementations, the processing unit 910 is further configured to: sample the second signal in the time domain to obtain a discrete time domain signal.

[0163] In some implementations, the discrete time domain signal includes: Among them, s(k) is the discrete time domain signal, m is the sequence number of the frequency domain, m∈[0,M-1], p(m,t) is the OFDM signal corresponding to the frequency domain position m, △f is the subcarrier spacing, and k is the sequence number of the time sequence.

[0164] In some implementations, the processing unit 910 is further configured to: add a cyclic prefix before the second signal on each time domain symbol, wherein the cyclic prefix is ​​greater than a maximum transmission delay of the second signal.

[0165] In some implementations, the sending end device is a terminal device, and the sending end device also includes: a transceiver unit 920, used to receive indication information sent by a network device, wherein the indication information is used to indicate whether the signal modulation method of the terminal device includes the second signal modulation method; the processing unit 910 is specifically used to: when the indication information indicates that the second signal debugging method is included, modulate the first signal based on the first signal modulation method and the second signal modulation method to obtain the second signal.

[0166] In some implementations, the processing unit 910 is further configured to: when the indication information indicates that the second signal debugging mode is not included, perform modulation processing on the signal to be sent based on the first signal modulation mode.

[0167] In some implementations, the indication information is carried in broadcast signaling. For example, the broadcast signaling is MIB

[0168] In some implementations, the indication information is associated with a signal transmission direction; or, the indication information includes a bit string, wherein multiple bits in the bit string are respectively associated with multiple directions, wherein each bit is used to indicate whether the signal transmitted in the direction associated with it is an OFDM waveform or a non-OFDM waveform.

[0169] It can be understood that the processing unit 910 may be, for example, the processor 1110, and the transceiver unit 920 may be, for example, the transceiver 1130. In addition, the transmitting end device 900 may also include a memory 1120, for details, see Fig.11 .

[0170] Fig.10 A schematic diagram of the structure of a receiving device provided in an embodiment of the present application. Fig.10 The receiving end device 1000 shown may include a processing unit 1010. The processing unit 1010 is used to demodulate the second signal based on the demodulation mode corresponding to the first signal modulation mode and the demodulation mode corresponding to the second signal modulation mode to obtain the first signal; wherein the first signal modulation mode includes OFDM, and the second signal modulation mode includes a signal modulation mode other than OFDM.

[0171] In some implementations, the second signal modulation scheme is associated with OTFS.

[0172] In some implementations, the processing unit 1010 is specifically configured to: sequentially perform OFDM processing and symplectic finite Fourier processing on the second signal to obtain the first signal.

[0173] In some implementations, the second signal is a time domain signal, and the first signal is a delay Doppler signal.

[0174] In some implementations, the processing unit 1010 is specifically used to: obtain multiple OFDM signals corresponding to multiple frequency domain positions based on the second signal; perform OFDM processing on the OFDM signal corresponding to each time domain position in the multiple frequency domain positions to obtain a discrete time-frequency domain signal corresponding to each frequency domain position; and perform symplectic finite Fourier processing based on the discrete time-frequency domain signals corresponding to the multiple frequency domain positions to obtain the first signal.

[0175] In some implementations, the first signal is a two-dimensional array in the delay domain and the Doppler domain, and the processing unit 1010 is further used to perform parallel-to-serial conversion on the first signal.

[0176] In some implementations, the first signal and the discrete time-frequency domain signal satisfy: Among them, x(k,l) is the first signal, X(m,n) is the discrete time-frequency domain signal, k is the sequence number of the delay domain, k∈[0,M-1], l is the sequence number of the Doppler domain, l∈[0,N-1], m is the sequence number of the frequency domain, m∈[0,M-1], and n is the sequence number of the time domain, n∈[0,N-1].

[0177] In some implementations, the OFDM signal corresponding to each frequency domain position and the discrete time-frequency domain signal corresponding to each frequency domain position satisfy the following relationship: Among them, X(m,n) is the discrete time-frequency domain signal corresponding to the frequency domain position m, n is the sequence number of the time domain, n∈[0,N-1], m is the sequence number of the frequency domain, m∈[0,M-1], p(m,t) is the OFDM signal corresponding to the frequency domain position m, g tx (t―nT) is the shaping filter, △f is the subcarrier spacing, and T is the symbol transmission period.

[0178] In some implementations, the second signal satisfies the following relationship with the plurality of OFDM signals: Among them, s(t) is the second signal, m is the serial number in the frequency domain, m∈[0,M-1], p(m,t) is the OFDM signal corresponding to the frequency domain position m, △f is the subcarrier spacing, and T is the symbol transmission period.

[0179] In some implementations, the second signal is a continuous time domain signal, and the processing unit 1010 is further configured to: convert a discrete time domain signal into the continuous time domain signal.

[0180] In some implementations, the discrete time domain signal includes: Among them, s(k) is the discrete time domain signal, m is the sequence number of the frequency domain, m∈[0,M-1], p(m,t) is the OFDM signal corresponding to the frequency domain position m, △f is the subcarrier spacing, and k is the sequence number of the time sequence.

[0181] In some implementations, the processing unit 1010 is further configured to: remove a cyclic prefix preceding the second signal on each time domain symbol, wherein the cyclic prefix is ​​greater than a maximum transmission delay of the second signal.

[0182] In some implementations, the receiving device is a network device, and the receiving device further includes: a transceiver unit 1020, configured to send indication information to a terminal device, wherein the indication information is configured to indicate whether the signal modulation method of the terminal device includes the second signal modulation method.

[0183] In some implementations, the indication information is carried in broadcast signaling, for example, the broadcast signaling is MIB.

[0184] In some implementations, the indication information is associated with a signal transmission direction; or, the indication information includes a bit string, wherein multiple bits in the bit string are respectively associated with multiple directions, wherein each bit is used to indicate whether the signal transmitted in the direction associated with it is an OFDM waveform or a non-OFDM waveform.

[0185] It can be understood that the processing unit 1010 may be, for example, the processor 1110, and the transceiver unit 1020 may be, for example, the transceiver 1130. In addition, optionally, the receiving end device 1000 further includes a memory 1120, for details, see Fig.11 .

[0186] Fig.11 It is a schematic structural diagram of a device for communication according to an embodiment of the present application. Fig.11 The dotted line shown in indicates that the unit or module is optional. The apparatus 1100 may be used to implement the method described in the above method embodiment. The apparatus 1100 may be, for example, a chip, a terminal device or a network device.

[0187] The device 1100 may include one or more processors 1110. The processor 1110 may support the device 1100 to implement the method described in the aforementioned method embodiment. The processor 1110 may be a general-purpose processor or a special-purpose processor. For example, the processor 1110 may be a central processing unit (CPU). Alternatively, the processor 1110 may also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or may be any conventional processor, etc.

[0188] The apparatus 1100 may further include one or more memories 1120. The memory 1120 stores a program, which can be executed by the processor 1110, so that the processor 1110 executes the method described in the above method embodiment. The memory 1120 may be independent of the processor 1110, or may be integrated in the processor 1110.

[0189] The apparatus 1100 may further include a transceiver 1130. The processor 1110 may communicate with other devices or chips through the transceiver 1130. For example, the processor 1110 may transmit and receive data with other devices or chips through the transceiver 1130.

[0190] The embodiment of the present application also provides a communication system. The communication system includes the above-mentioned sending end device and receiving end device. In some implementations, the system also includes other devices that interact with the sending end device and the receiving end device.

[0191] The embodiment of the present application also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to the transmitting end device or the receiving end device provided in the embodiment of the present application, and the program enables the computer to execute the method performed by the transmitting end device or the receiving end device in each embodiment of the present application.

[0192] The embodiment of the present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to the transmitting end device or the receiving end device provided in the embodiment of the present application, and the program enables the computer to execute the method performed by the transmitting end device or the receiving end device in each embodiment of the present application.

[0193] The present application also provides a computer program. The computer program can be applied to the transmitting device or receiving device provided in the present application, and the computer program enables the computer to execute the method executed by the transmitting device or receiving device in each embodiment of the present application.

[0194] It should be understood that the terms "system" and "network" in the embodiments of the present application can be used interchangeably. In addition, the terms used in the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application. The terms "first", "second", "third" and "fourth" in the specification and claims of the present application and the accompanying drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions.

[0195] In the embodiments of the present application, the "indication" mentioned can be a direct indication, an indirect indication, or an indication of an association relationship. For example, A indicates B, which can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association relationship between A and B.

[0196] In the embodiment of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should be understood that determining B according to A does not mean determining B only according to A, and B can also be determined according to A and / or other information.

[0197] In the embodiments of the present application, the term "corresponding" may indicate that there is a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship of indication and being indicated, configuration and being configured, etc.

[0198] In the embodiments of the present application, "pre-definition" or "pre-configuration" can be implemented by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in a device (for example, including a transmitting device and a receiving device), and the present application does not limit the specific implementation method. For example, pre-definition can refer to what is defined in the protocol.

[0199] In the embodiments of the present application, the “protocol” may refer to a standard protocol in the communication field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and the present application does not limit this.

[0200] In the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0201] In various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0202] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0203] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0204] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0205] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that can be read by a computer or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital video disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0206] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A signal processing method, characterized in that: include: Modulate the first signal based on the first signal modulation mode and the second signal modulation mode to obtain a second signal; The first signal modulation method includes orthogonal frequency division multiplexing (OFDM), and the second signal modulation method includes a signal modulation method other than OFDM.

2. The method according to claim 1, characterized in that The second signal modulation mode is associated with an orthogonal time-frequency space OTFS.

3. The method according to claim 1 or 2, characterized in that: The method of modulating the first signal based on the first signal modulation mode and the second signal modulation mode to obtain the second signal includes: The first signal is processed sequentially by symplectic finite Fourier processing and OFDM processing to obtain the second signal.

4. The method according to claim 3, characterized in that The first signal is a delay Doppler signal, and the second signal is a time domain signal, wherein the first signal is sequentially subjected to symplectic finite Fourier processing and OFDM processing to obtain the second signal, including: Performing symplectic finite Fourier processing on the first signal to obtain a discrete time-frequency domain signal; Performing OFDM processing on the discrete time-frequency domain signal corresponding to each frequency domain position in the multiple frequency domain positions to obtain an OFDM signal corresponding to each frequency domain position; The second signal is obtained based on the multiple OFDM signals corresponding to the multiple frequency domain positions.

5. The method according to claim 4, characterized in that The first signal and the discrete time-frequency domain signal satisfy the following conditions: Among them, x(k,l) is the first signal, X(m,n) is the discrete time-frequency domain signal, k is the sequence number of the delay domain, k∈[0,M-1], l is the sequence number of the Doppler domain, l∈[0,N-1], m is the sequence number of the frequency domain, m∈[0,M-1], and n is the sequence number of the time domain, n∈[0,N-1].

6. The method according to claim 4 or 5, characterized in that: The OFDM signal corresponding to each frequency domain position and the discrete time-frequency domain signal corresponding to each frequency domain position satisfy the following: Among them, X(m,n) is the discrete time-frequency domain signal corresponding to the frequency domain position m, n is the sequence number of the time domain, n∈[0,N-1], m is the sequence number of the frequency domain, m∈[0,M-1], p(m,t) is the OFDM signal corresponding to the frequency domain position m, g tx (t―nT) is the shaping filter, △f is the subcarrier spacing, and T is the symbol transmission period.

7. The method according to any one of claims 4 to 6, characterized in that The second signal and the multiple OFDM signals satisfy: Among them, s(t) is the second signal, m is the serial number in the frequency domain, m∈[0,M-1], p(m,t) is the OFDM signal corresponding to the frequency domain position m, △f is the subcarrier spacing, and T is the symbol transmission period.

8. The method according to any one of claims 1 to 7, characterized in that The method is performed by a terminal device, and the method further includes: The terminal device receives indication information sent by the network device, wherein the indication information is used to indicate whether the signal modulation mode of the terminal device includes the second signal modulation mode; The method of modulating the first signal based on the first signal modulation mode and the second signal modulation mode to obtain the second signal includes: In a case where the indication information includes the second signal debugging mode, the terminal device modulates the first signal based on the first signal modulation mode and the second signal modulation mode to obtain the second signal.

9. The method according to claim 8, characterized in that The method further comprises: When the indication information indicates that the second signal modulation mode is not included, the terminal device modulates the first signal based on the first signal modulation mode to obtain the second signal.

10. The method according to claim 8 or 9, characterized in that: The indication information is carried in broadcast signaling.

11. The method according to claim 10, characterized in that The indication information is associated with the signal transmission direction; or, The indication information includes a bit string, wherein a plurality of bits in the bit string are respectively associated with a plurality of directions, wherein each bit is used to indicate whether a signal transmitted in the direction associated with it is an OFDM waveform or a non-OFDM waveform.

12. The method according to claim 10 or 11, characterized in that: The broadcast signaling is a master information block MIB.

13. A signal processing method, characterized in that: include: Demodulate the second signal based on a demodulation method corresponding to the first signal modulation method and a demodulation method corresponding to the second signal modulation method to obtain a first signal; The first signal modulation method includes orthogonal frequency division multiplexing (OFDM), and the second signal modulation method includes a signal modulation method other than OFDM.

14. The method according to claim 13, characterized in that The second signal modulation mode is associated with an orthogonal time-frequency space OTFS.

15. The method according to claim 13 or 14, characterized in that The demodulating the second signal based on the demodulation mode corresponding to the first signal modulation mode and the demodulation mode corresponding to the second signal modulation mode to obtain the first signal includes: The second signal is processed by OFDM and symplectic finite Fourier transform in sequence to obtain the first signal.

16. The method according to claim 15, characterized in that The second signal is a time domain signal, and the first signal is a delay Doppler signal, wherein the second signal is subjected to OFDM processing and symplectic finite Fourier processing in sequence to obtain the first signal, including: Based on the second signal, obtaining multiple OFDM signals corresponding to multiple frequency domain positions; Performing OFDM processing on the OFDM signal corresponding to each time domain position in the multiple frequency domain positions to obtain a discrete time-frequency domain signal corresponding to each frequency domain position; Based on the discrete time-frequency domain signals corresponding to the multiple frequency domain positions, symplectic finite Fourier processing is performed to obtain the first signal.

17. The method according to claim 16, characterized in that The first signal and the discrete time-frequency domain signal satisfy the following conditions: Among them, x(k,l) is the first signal, X(m,n) is the discrete time-frequency domain signal, k is the sequence number of the delay domain, k∈[0,M-1], l is the sequence number of the Doppler domain, l∈[0,N-1], m is the sequence number of the frequency domain, m∈[0,M-1], and n is the sequence number of the time domain, n∈[0,N-1].

18. The method according to claim 16 or 17, characterized in that The OFDM signal corresponding to each frequency domain position and the discrete time-frequency domain signal corresponding to each frequency domain position satisfy the following: Among them, X(m,n) is the discrete time-frequency domain signal corresponding to the frequency domain position m, n is the sequence number of the time domain, n∈[0,N-1], m is the sequence number of the frequency domain, m∈[0,M-1], p(m,t) is the OFDM signal corresponding to the frequency domain position m, g tx (t―nT) is the shaping filter, △f is the subcarrier spacing, and T is the symbol transmission period.

19. The method according to any one of claims 16 to 18, characterized in that The second signal and the multiple OFDM signals satisfy: Among them, s(t) is the second signal, m is the serial number in the frequency domain, m∈[0,M-1], p(m,t) is the OFDM signal corresponding to the frequency domain position m, △f is the subcarrier spacing, and T is the symbol transmission period.

20. The method according to any one of claims 13 to 19, characterized in that The method is performed by a network device, and the method further includes: The network device sends indication information to the terminal device, wherein the indication information is used to indicate whether the signal modulation method of the terminal device includes the second signal modulation method.

21. The method according to claim 20, characterized in that The indication information is carried in broadcast signaling.

22. The method according to claim 21, characterized in that The indication information is associated with the signal transmission direction; or, The indication information includes a bit string, wherein a plurality of bits in the bit string are respectively associated with a plurality of directions, wherein each bit is used to indicate whether a signal transmitted in the direction associated with it is an OFDM waveform or a non-OFDM waveform.

23. The method according to claim 21 or 22, characterized in that The broadcast signaling is a master information block MIB.

24. A transmitting end device, characterized in that: include: A processing unit, configured to modulate the first signal based on the first signal modulation mode and the second signal modulation mode to obtain a second signal; The first signal modulation method includes orthogonal frequency division multiplexing (OFDM), and the second signal modulation method includes a signal modulation method other than OFDM.

25. The transmitting end device according to claim 24, characterized in that: The second signal modulation mode is associated with an orthogonal time-frequency space OTFS.

26. The transmitting end device according to claim 24 or 25, characterized in that: The processing unit is specifically used for: The first signal is processed sequentially by symplectic finite Fourier processing and OFDM processing to obtain the second signal.

27. The transmitting end device according to claim 26, characterized in that: The first signal is a delay Doppler signal, and the second signal is a time domain signal, wherein the processing unit is specifically used for: Performing symplectic finite Fourier processing on the first signal to obtain a discrete time-frequency domain signal; Performing OFDM processing on the discrete time-frequency domain signal corresponding to each frequency domain position in the multiple frequency domain positions to obtain an OFDM signal corresponding to each frequency domain position; The second signal is obtained based on the multiple OFDM signals corresponding to the multiple frequency domain positions.

28. The transmitting end device according to claim 27, characterized in that: The first signal and the discrete time-frequency domain signal satisfy the following conditions: Among them, x(k,l) is the first signal, X(m,n) is the discrete time-frequency domain signal, k is the sequence number of the delay domain, k∈[0,M-1], l is the sequence number of the Doppler domain, l∈[0,N-1], m is the sequence number of the frequency domain, m∈[0,M-1], and n is the sequence number of the time domain, n∈[0,N-1].

29. The transmitting end device according to claim 27 or 28, characterized in that: The OFDM signal corresponding to each frequency domain position and the discrete time-frequency domain signal corresponding to each frequency domain position satisfy the following: Among them, X(m,n) is the discrete time-frequency domain signal corresponding to the frequency domain position m, n is the sequence number of the time domain, n∈[0,N-1], m is the sequence number of the frequency domain, m∈[0,M-1], p(m,t) is the OFDM signal corresponding to the frequency domain position m, g tx (t―nT) is the shaping filter, △f is the subcarrier spacing, and T is the symbol transmission period.

30. The transmitting end device according to any one of claims 27 to 29, characterized in that: The second signal and the multiple OFDM signals satisfy: Among them, s(t) is the second signal, m is the serial number in the frequency domain, m∈[0,M-1], p(m,t) is the OFDM signal corresponding to the frequency domain position m, △f is the subcarrier spacing, and T is the symbol transmission period.

31. The transmitting end device according to any one of claims 24 to 30, characterized in that: The transmitting end device is a terminal device, and the transmitting end device further includes: a transceiver unit, configured to receive indication information sent by a network device, wherein the indication information is used to indicate whether the signal modulation mode of the terminal device includes the second signal modulation mode; The processing unit is specifically used for: In a case where the indication information indicates that the second signal debugging mode is included, the first signal is modulated based on the first signal modulation mode and the second signal modulation mode to obtain the second signal.

32. The transmitting end device according to claim 31, characterized in that: The processing unit is also used for: When the indication information indicates that the second signal debugging mode is not included, the signal to be sent is modulated based on the first signal modulation mode.

33. The transmitting end device according to claim 31 or 32, characterized in that: The indication information is carried in broadcast signaling.

34. The transmitting end device according to claim 33, characterized in that: The indication information is associated with the signal transmission direction; or, The indication information includes a bit string, wherein a plurality of bits in the bit string are respectively associated with a plurality of directions, wherein each bit is used to indicate whether a signal transmitted in the direction associated with it is an OFDM waveform or a non-OFDM waveform.

35. The transmitting end device according to claim 33 or 34, characterized in that: The broadcast signaling is a master information block MIB.

36. A receiving device, characterized in that: include: a processing unit, configured to demodulate the second signal based on a demodulation mode corresponding to the first signal modulation mode and a demodulation mode corresponding to the second signal modulation mode to obtain a first signal; The first signal modulation method includes orthogonal frequency division multiplexing (OFDM), and the second signal modulation method includes a signal modulation method other than OFDM.

37. The receiving end device according to claim 36, characterized in that: The second signal modulation mode is associated with an orthogonal time-frequency space OTFS.

38. The receiving end device according to claim 36 or 37, characterized in that: The processing unit is specifically used for: The second signal is processed by OFDM and symplectic finite Fourier transform in sequence to obtain the first signal.

39. The receiving end device according to claim 38, characterized in that: The second signal is a time domain signal, and the first signal is a delay Doppler signal, wherein the processing unit is specifically used for: Based on the second signal, obtaining multiple OFDM signals corresponding to multiple frequency domain positions; Performing OFDM processing on the OFDM signal corresponding to each time domain position in the multiple frequency domain positions to obtain a discrete time-frequency domain signal corresponding to each frequency domain position; Based on the discrete time-frequency domain signals corresponding to the multiple frequency domain positions, symplectic finite Fourier processing is performed to obtain the first signal.

40. The receiving end device according to claim 38 or 39, characterized in that: The first signal and the discrete time-frequency domain signal satisfy the following conditions: Among them, x(k,l) is the first signal, X(m,n) is the discrete time-frequency domain signal, k is the sequence number of the delay domain, k∈[0,M-1], l is the sequence number of the Doppler domain, l∈[0,N-1], m is the sequence number of the frequency domain, m∈[0,M-1], and n is the sequence number of the time domain, n∈[0,N-1].

41. The receiving end device according to any one of claims 39 to 40, characterized in that: The OFDM signal corresponding to each frequency domain position and the discrete time-frequency domain signal corresponding to each frequency domain position satisfy the following: Among them, X(m,n) is the discrete time-frequency domain signal corresponding to the frequency domain position m, n is the sequence number of the time domain, n∈[0,N-1], m is the sequence number of the frequency domain, m∈[0,M-1], p(m,t) is the OFDM signal corresponding to the frequency domain position m, g tx (t―nT) is the shaping filter, △f is the subcarrier spacing, and T is the symbol transmission period.

42. The receiving end device according to any one of claims 39 to 41, characterized in that: The second signal and the multiple OFDM signals satisfy: Among them, s(t) is the second signal, m is the serial number in the frequency domain, m∈[0,M-1], p(m,t) is the OFDM signal corresponding to the frequency domain position m, △f is the subcarrier spacing, and T is the symbol transmission period.

43. The receiving end device according to any one of claims 36 to 42, characterized in that: The receiving end device is a network device, and the receiving end device further includes: A transceiver unit is used to send indication information to a terminal device, wherein the indication information is used to indicate whether the signal modulation method of the terminal device includes the second signal modulation method.

44. The receiving device according to claim 43, characterized in that: The indication information is carried in broadcast signaling.

45. The receiving device according to claim 44, characterized in that: in, The indication information is associated with the signal transmission direction; or, The indication information includes a bit string, wherein a plurality of bits in the bit string are respectively associated with a plurality of directions, wherein each bit is used to indicate whether a signal transmitted in the direction associated with it is an OFDM waveform or a non-OFDM waveform.

46. ​​The receiving end device according to claim 44 or 45, characterized in that: The broadcast signaling is a master information block MIB.

47. A transmitting end device, characterized in that: It comprises a transceiver, a memory and a processor, wherein the memory is used to store programs, and the processor is used to call the programs in the memory and control the transceiver to receive or send signals so that the sending end device executes the method according to any one of claims 1 to 12.

48. A receiving device, characterized in that: It comprises a transceiver, a memory and a processor, wherein the memory is used to store programs, and the processor is used to call the programs in the memory and control the transceiver to receive or send signals so that the receiving end device executes the method according to any one of claims 13 to 23.

49. A device, characterized in that The device comprises a processor, configured to call a program from a memory so as to enable the device to execute the method according to any one of claims 1 to 23.

50. A chip, characterized in that: The device comprises a processor, configured to call a program from a memory, so that a device equipped with the chip executes a method according to any one of claims 1 to 23.

51. A computer-readable storage medium, characterized in that: A program is stored thereon, the program causing a computer to execute the method according to any one of claims 1 to 23.

52. A computer program product, characterized in that A program is included, which causes a computer to execute the method according to any one of claims 1 to 23.

53. A computer program, characterized in that The computer program causes a computer to execute the method according to any one of claims 1 to 23.

Images