Signal processing method, sending-end device and receiving-end device

Abstract

Provided are a signal processing method, a sending-end device and a receiving-end device. The method comprises: modulating a first signal, so as to obtain a second signal, wherein the second signal comprises a third signal obtained on the basis of a first signal modulation mode and a fourth signal obtained on the basis of a second signal modulation mode, the first signal modulation mode includes OFDM, and the second signal modulation mode includes a signal modulation mode other than the OFDM. The present application provides two different signal modulation modes, i.e., a first signal modulation mode (e.g., OFDM) and a second signal modulation mode (e.g., a signal modulation mode other than the OFDM) for modulating a first signal, and a second signal obtained comprises a third signal obtained on the basis of the first signal modulation mode and a fourth signal obtained on the basis of the second signal modulation mode, thereby realizing the cooperative transmission of signals based on two different modulation modes, and facilitating the improvement of the signal transmission performance.

Description

Signal processing methods, transmitting equipment, and receiving equipment Technical Field

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

[0002] With the development of wireless communication, new application demands are constantly increasing, requiring support for many new scenarios and services, such as integrated sensing and communication (ISAC) and space-air-ground integrated (SAGI). Therefore, for mobile communication networks, it is not only necessary to optimize communication processes, but also to improve signal processing capabilities to enhance signal transmission performance. Summary of the Invention

[0003] This application provides a signal processing method, a transmitting device, and a receiving device. The various aspects covered by this application are described below.

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

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

[0006] Thirdly, a transmitting device is provided, comprising: a processing unit for modulating a first signal to obtain a second signal; wherein the second signal includes a third signal obtained based on a first signal modulation method and a fourth signal obtained based on a second signal modulation method, the first signal modulation method including OFDM, and the second signal modulation method including signal modulation methods other than OFDM.

[0007] Fourthly, a receiving device is provided, comprising: a processing unit for demodulating a second signal to obtain a first signal; wherein the second signal includes a third signal and a fourth signal, the first signal includes a first part obtained by demodulating the third signal based on a demodulation method corresponding to a first signal modulation method, and a second part obtained by demodulating the fourth signal based on a demodulation method corresponding to a second signal modulation method, the first signal modulation method including OFDM, and the second signal modulation method including signal modulation methods other than OFDM.

[0008] Fifthly, a transmitting device is provided, including a transceiver, a memory, and a processor, wherein the memory is used to store a program, and the processor is used to call the program in the memory and control the transceiver to receive or send signals, so that the transmitting device performs the method as described in the first aspect.

[0009] In a sixth aspect, a receiving device is provided, including a transceiver, a memory, and a processor, wherein the memory is used to store a program, and the processor is used to invoke the program in the memory and control the transceiver to receive or transmit signals, so that the receiving device performs the method as described in the second aspect.

[0010] A seventh aspect provides an apparatus including a processor for calling a program from a memory to cause the apparatus to perform the method as described in any one of the first or second aspects.

[0011] Eighthly, a chip is provided, including a processor for calling a program from memory to cause a device having the chip mounted to perform the method as described in the first or second aspect.

[0012] Ninth aspect, a computer-readable storage medium is provided having a program stored thereon that causes a computer to perform the method as described in the first or second aspect.

[0013] A tenth aspect provides a computer program product, including a program that causes a computer to perform the method as described in the first or second aspect.

[0014] Eleventhly, a computer program is provided that causes a computer to perform the method as described in the first or second aspect.

[0015] This application provides two different signal modulation methods, namely a first signal modulation method (e.g., OFDM) and a second signal modulation method (e.g., a signal modulation method other than OFDM), for modulating a first signal. The resulting second signal includes a third signal obtained based on the first signal modulation method and a fourth signal obtained based on the second signal modulation method, thereby realizing the coordinated transmission of signals with two different modulation methods, which is beneficial to improving signal transmission performance. Attached Figure Description

[0016] Figure 1 is a system architecture example diagram of a wireless communication system applicable to embodiments of this application.

[0017] Figure 2 is a schematic diagram of future communication scenarios.

[0018] Figure 3 is a schematic flowchart of OFDM processing applicable to the embodiments of this application.

[0019] Figure 4 is a schematic flowchart of the OTFS processing applicable to the embodiments of this application.

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

[0021] Figure 6 is a schematic diagram of the transmission of the third and fourth signals using frequency division in an embodiment of this application.

[0022] Figure 7 is a schematic diagram of the transmission of the third and fourth signals using frequency division in an embodiment of this application.

[0023] Figure 8 is a schematic diagram of the transmission of the third and fourth signals in a time-division manner in an embodiment of this application.

[0024] Figure 9 is a schematic diagram of the transmission of the third and fourth signals in a time-division manner in an embodiment of this application.

[0025] Figure 10 is a schematic diagram of one possible implementation of the signal processing method shown in Figure 6.

[0026] Figure 11 is a schematic diagram of an example of the serial-to-parallel transformation shown in Figure 10.

[0027] Figure 12 is a schematic flowchart of the signal processing method according to an embodiment of this application.

[0028] Figure 13 is a schematic diagram of the structure of the transmitting end device according to an embodiment of this application.

[0029] Figure 14 is a schematic diagram of the structure of the receiving end device according to an embodiment of this application.

[0030] Figure 15 is a schematic diagram of a communication apparatus according to an embodiment of this application. Detailed Implementation

[0031] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0032] Wireless communication system

[0033] Figure 1 is an example diagram of the system architecture of a wireless communication system 100 to which embodiments of this 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 can provide network coverage for a specific geographical area and can communicate with the terminal device 120 located within that coverage area. The terminal device 120 can 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; this embodiment of the application does not limit this.

[0034] It should be understood that the technical solutions of the embodiments of this application can be applied to various communication systems, such as: fifth generation (5G) systems, new radio (NR), long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, etc. The technical solutions provided in this application can also be applied to future communication systems, such as sixth generation mobile communication systems, satellite communication systems, etc.

[0035] In this application embodiment, 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 apparatus. The terminal device in this application embodiment can be a device that provides voice and / or data connectivity to a user, and can be used to connect people, objects, and machines, such as a handheld device with wireless connectivity, vehicle-mounted device, etc. Terminal devices can also be mobile phones, tablets, laptops, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, self-driving, remote medical surgery, smart grids, transportation safety, smart cities, and smart homes. Optionally, terminal devices can act as base stations. For example, a terminal device can act as a dispatching entity, providing sidelink signals between terminal devices in vehicle-to-everything (V2X) or device-to-device (D2D) systems. For instance, cellular phones and cars communicate with each other using sidelink signals. Cellular phones and smart home devices communicate without relaying communication signals through base stations.

[0036] In this embodiment, the network device can be a device used to communicate with a terminal device. The network device can be an access network device or a wireless access network device. For example, the network device can be a base station. The term "base station" can broadly encompass various names as follows, or can be replaced by names such as: NodeB, evolved NodeB (eNB), next-generation NodeB (gNB), relay station, transmitting and receiving point (TRP), transmitting point (TP), master station (MeNB), secondary station (SeNB), multi-mode radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. A base station can be a macro base station, micro base station, relay node, donor node, or similar entity, or a combination thereof. A base station can also refer to a communication module, modem, or chip installed within the aforementioned equipment or apparatus. A base station can also be a mobile switching center, or an entity that performs base station functions in device-to-device (D2D), vehicle-to-everything (V2X), and machine-to-machine (M2M) communications, a network-side device in a 6G network, or an entity that performs base station functions in future communication systems. A base station can support networks using the same or different access technologies. The embodiments of this application do not limit the specific technologies or device forms used in the network equipment.

[0037] Furthermore, base stations 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 depending on the location of the mobile base station. In other examples, a helicopter or drone can be configured as a device to communicate with another base station.

[0038] Network devices and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; and they can also be deployed in the air on airplanes, balloons, and satellites. This application does not limit the scenario in which the network devices and terminal devices are located.

[0039] It should be understood that all or part of the functions of the communication device in this application can also be implemented by software functions running on hardware, or by virtualization functions instantiated on a platform such as a cloud platform.

[0040] In wireless communication, transmitted signals typically undergo multipath propagation and arrive at the receiver with varying delays. Generally, if the symbol gap is smaller than or close to the channel delay spread, harmful inter-symbol interference (ISI) occurs. The core of multiple access methods and waveform design lies in synthesizing and generating the transmitted waveform to most efficiently transmit the information-carrying symbols through the propagation channel.

[0041] In LTE and NR (New Radio) systems, orthogonal frequency division multiplexing (OFDM) has achieved great success. It can convert frequency-selective channels into parallel frequency-flat sub-channels through multi-carrier transmission, thereby effectively reducing inter-symbol interference and enabling flexible time-frequency resource allocation. However, OFDM also has some practical problems, including:

[0042] Larger cyclic profix (CP) overhead;

[0043] Peak-to-average power ratio (PAPR);

[0044] Severe inter-carrier inference (ICI) in high-speed mobile scenarios;

[0045] High out-of-band emission (OOBE).

[0046] In the LTE uplink, OFDM extended by discrete Fourier transform (DFT-s-OFDM) is used to reduce PAPR. However, this may increase implementation complexity or degrade system performance. With the development of wireless communication and the continuous increase in new application demands, mobile communication networks not only need to further improve communication performance but also need to support many new scenarios and services, such as ISAC and SAGI. Therefore, multiple access design (or waveform design) needs to consider support for wireless sensing and high-speed mobility.

[0047] In the 2G and 3G eras, signal bandwidth was relatively small. OFDM was adopted starting with 4G and continues to be used in 5G. OFDM divides transmitted data into multiple sub-channels (or subcarriers) for parallel transmission. Each subcarrier carries a portion of the data at a low rate. During broadband transmission, the orthogonality between subcarriers is used to reduce interference. Subcarrier spectrum overlap fully utilizes subcarrier resources, improving spectrum utilization. Furthermore, in OFDM systems, inter-symbol interference caused by multipath propagation can be mitigated by inserting guard intervals (e.g., CP). Since signal detection, channel estimation, and other receiving processing in OFDM systems only require simple gain adjustment for each subcarrier in the frequency domain, without the need for complex time-domain equalizers, OFDM can easily be combined with other technologies, such as multiple-input multiple-output (MIMO), to further improve system performance. Considering that existing standards are based on OFDM, designing a new system standard completely departing from OFDM would result in massive engineering projects and a significant impact on the industry landscape. Based on the advantages of OFDM in existing systems, such as high spectrum utilization, good inter-user orthogonality, low detection complexity, and easy integration with other technologies, this application embodiment considers the coexistence of OFDM with other multiple access (or waveforms).

[0048] The International Mobile Telecommunications (IMT)-2030 (i.e., 6G) defines six major scenarios. For example, as shown in Figure 2, the main applicable scenarios of IMT-2030 involve enhanced mobile broadband (eMBB), IMT-2020, massive machine-type communication (mMTC), and ultra-reliable and low-latency communication (URLLC), specifically including immersive communication, integrated sensing and communication, massive communication, ubiquitous connectivity, hyper-reliable and low-latency communication, and integrated AI and communication. In particular, integrated sensing has been identified as one of the six major application scenarios of 6G. 6G will achieve deep integration of communication and sensing, share wireless resources, and support environmental perception and efficient communication.

[0049] When modeling wireless channels, models are typically built in the time domain, frequency domain, or time-frequency (TF) domain. For OFDM systems, the signal can be converted to the frequency domain, and frequency domain analysis can reduce the complexity of channel convolution caused by multipath delay. For wireless channels with fewer taps, time domain processing is sometimes more convenient. Some signals exhibit changing characteristics in both the time and frequency domains, and joint time-frequency processing can better characterize these signal features; wavelet transformations can be considered a form of time-frequency processing. However, wireless channels may be affected by time-frequency domain selective (TFDS) fading. In contrast, leveraging the spatial sparsity of multipath, wireless channels can also be represented in the delay-Doppler (DD) domain, requiring only a small number of channel coefficients for description. High-frequency transmission in the millimeter wave (mm wave) or terahertz (THz) bands and ultra-large-scale multiple-input multiple-output (XL-MIMO) are two potential technological highlights of 6G. This makes wireless channels much sparser compared to traditional sub-6 GHz channels. Furthermore, millimeter-wave XL-MIMO systems offer high resolution and rich design freedom in the spatial domain. Leveraging the high spatial resolution provided by multiple antennas and millimeter waves in 6G, channel characteristics can be captured through the states of key scatterers in the propagation environment (e.g., delay, Doppler frequency, and normalized angle), which can be represented in the delay-Doppler domain. This enables the unification of environmental sensing and channel estimation by extracting individual multipath features to simultaneously serve communication and sensing, rather than simply estimating composite channel characteristics.

[0050] Therefore, delay-Doppler domain waveform design has received increasing attention in recent years due to its robustness to channel fluctuations in high-speed mobile scenarios and its potential for high-performance ISACs. A typical example of a DD domain waveform is the orthogonal time-frequency space (OTFS). Typically, wireless channels experience time-frequency dual-selective fading. The main idea of ​​OTFS is to transform each DD tap across the entire time-frequency plane to utilize all multipath diversity. This can also be achieved in a similar way with vector OFDM (VOFDM), making OTFS, or VOFDM, more advantageous than traditional OFDM in TFDS fading channels.

[0051] Figure 3 illustrates the OFDM implementation process. The signal processing flow in the top row corresponds to the transmitting end, and the signal processing flow in the bottom row corresponds to the receiving end. OFDM processing at the transmitting end includes performing an inverse fast Fourier transform (IFFT) on the signal obtained after mapping and serial-to-parallel conversion. Afterwards, operations such as adding CP, windowing, parallel-to-serial conversion, and digital-to-analog converter (DAC) are performed to form the radio frequency signal to be transmitted. Similarly, the receiving end performs corresponding inverse operations on the received radio frequency signal to obtain the actual data content carried in the signal. For example, OFDM processing at the receiving end requires performing operations such as a fast Fourier transform (FFT) on the OFDM signal.

[0052] In OFDM processing, the signal to be transmitted needs to be mapped onto each subcarrier. This is done by using an inverse fast Fourier transform (IFFT) to transform the frequency domain signal 'a' on each subcarrier. k Converting to a time-domain signal s(n), where n ranges from 0 to N-1, can be achieved, for example, based on the following formula:

[0053] Figure 4 illustrates the implementation process of OTFS. The OTFS processing at the transmitting end sequentially includes the inverse symplectic finite flourier transform (ISFFT) and the Hessenberg transform, while the OTFS processing at the receiving end sequentially includes the Wigner transform and the symplectic finite flourier transform (SFFT). ISFFT can be used to convert the time-frequency domain signal into a time-delay Doppler domain signal.

[0054] The unit impulse response of a linear time-varying channel can be expressed as g(τ,t), where τ is the time delay and t is the time. Then, at time t, the relationship between the input and output of the channel can be expressed as: y(t)=∫x(t-τ)g(τ,t)dτ (2);

[0055] Let h(τ,ν) denote the Fourier transform of g(τ,t) in the time domain. Then we have: g(τ,t)=∫h(τ,ν)e j2πνt dν (3);

[0056] Taking x(t) and X(f) as a Fourier transform pair, we have: x(t-τ)=∫X(f)e- j2πfτ e j2πft df (4);

[0057] Substituting formula (4) into formula (2), we get: y(t)=∫∫g(τ,t)X(f)e -j2πfτ e j2πft dfdτ=∫X(f)H(f,t)e j2πft df (5); H(f,t)=∫g(τ,t)e-j2πfτdτ (6).

[0058] In this way, we can get: H(f,t)=∫∫h(τ,ν)ej2πνt-j2πfτdτdν (7).

[0059] Thus, the signals in the time-frequency domain (f,t) and the extended Doppler domain (τ,ν) satisfy the relationship described by the above formula (7).

[0060] If the signal to be transmitted is x(k,l), by converting x(k,l) to X(m,n) in the TF domain using ISFFT, a discrete time-frequency domain signal can be obtained, where k∈[0,M-1] is the index of the time delay domain, l∈[0,N-1] is the index of the Doppler domain, m represents the index of the frequency domain, and n represents the index of the time domain.

[0061] Next, the discrete time-frequency domain signal is converted into a continuous time-domain signal that the transmitter can send:

[0062] Among them, g tx (t) represents the emitter shaping filter, Δf represents the subcarrier spacing, and T represents the symbol transmission period.

[0063] Similar to OFDM signals, OTFS signals also require a cyclic prefix before each symbol. For example, the length of the cyclic prefix and the maximum delay can satisfy the following relationship: T CP >τ max , among which, T CP τ is the length of the cyclic prefix. max This represents the maximum delay in signal transmission.

[0064] As mentioned above, the embodiments of this application are based on a scenario where multiple multiple access methods (or multiple waveforms) coexist. Therefore, it is necessary to solve the problem of how to process signals in a scenario where multiple multiple access methods (or multiple waveforms) coexist.

[0065] To this end, this application provides two different signal modulation methods, namely a first signal modulation method and a second signal modulation method, for modulating the first signal. The resulting second signal includes a third signal obtained based on the first signal modulation method and a fourth signal obtained based on the second signal modulation method, thereby realizing the coordinated transmission of signals with two different modulation methods, which is beneficial to improving signal transmission performance.

[0066] In this embodiment, the first signal modulation method refers to OFDM or other time-frequency domain signal modulation methods. The second signal modulation method refers to a signal modulation method other than OFDM. For example, the second signal modulation method may be a signal modulation method associated with OTFS or other time-delay Doppler signal modulation methods; or, for example, the second signal modulation method may be a signal modulation method associated with Interleaved Frequency Division Multiplexing (IFDM), Orthogonal Delay-Doppler Division Multiplexing (ODDM), Orthogonal Chirp Division Multiplexing (OCDM), or Linear Frequency Modulation (LFM). The signal modulation method described in this embodiment may, for example, refer to a multi-carrier modulation method. The term "modulation" in this embodiment should be broadly understood as a "processing" of a signal.

[0067] The embodiments of this application will be described in detail below with reference to Figure 5.

[0068] Figure 5 is a schematic flowchart of a wireless signal processing method provided in an embodiment of this application. The method 500 shown in Figure 5 can be executed by a transmitting end. The transmitting end can be a terminal device, in which case the receiving end can be a network device; or, the transmitting end can be a network device, in which case the receiving end can be a terminal device. The terminal device can be, for example, the terminal device 120 shown in Figure 1, and the network device can be, for example, the network device 110 shown in Figure 1.

[0069] Referring to Figure 5, in step 510, the first signal is modulated to obtain the second signal.

[0070] The second signal includes a third signal obtained based on the modulation method of the first signal and a fourth signal obtained based on the modulation method of the second signal. The modulation method of the first signal includes OFDM, and the modulation method of the second signal includes signal modulation methods other than OFDM. For example, the modulation method of the second signal is associated with OTFS, IFDM, ODDM, OCDM, and LFM. That is to say, the second signal obtained by modulating the first signal includes two parts, and the two parts use different signal modulation methods.

[0071] The following describes the transmission method for these two parts.

[0072] Method 1

[0073] In mode 1, the third and fourth signals are transmitted using frequency division (or frequency domain division).

[0074] As an example, as shown in Figure 6, the third signal (i.e., the OFDM signal) and the fourth signal (e.g., the OTFS signal) are transmitted using frequency division.

[0075] To prevent signal interference between different frequency bands, in some implementations, a guard band is set between the frequency domain resources of the third and fourth signals transmitted using frequency division, as shown in Figure 7.

[0076] The first signal modulation method and the second signal modulation method can be associated with different frequency bands. The third signal can be transmitted on the frequency band associated with the first signal modulation method, and the fourth signal can be transmitted on the frequency band associated with the second signal modulation method.

[0077] As an example, if certain frequency bands support a second signal modulation method (or in other words, these frequency bands can have non-OFDM waveforms), then a fourth signal can be transmitted on these frequency bands. Conversely, if certain frequency bands do not support a second signal modulation method (or in other words, these frequency bands cannot have non-OFDM waveforms), then a fourth signal cannot be transmitted on these frequency bands. For example, if this frequency band is shared by 5G and 6G, non-OFDM waveforms may not be supported on this frequency band to ensure better coexistence between 6G and 5G systems. Furthermore, if certain frequency bands support a first signal modulation method, then a third signal can be transmitted on these frequency bands. Finally, if certain frequency bands simultaneously support both the first and second signal modulation methods, then both the third and fourth signals can be transmitted on these frequency bands.

[0078] Frequency domain resources used for transmitting signals based on a second signal modulation scheme (e.g., a fourth signal) can be indicated to terminal devices by network devices. For example, information about these frequency domain resources can be broadcast within the cell via system information (e.g., a system information block (SIB1)).

[0079] When a frequency band is occupied by non-OFDM signals, the starting point of the OFDM resources used for data communication by terminal devices should be from the starting point of the actual OFDM resources. For example, if the original OFDM resource frequency starting point F0 = 0Hz, and 0-100Hz is occupied by OTFS signals, the OFDM resource frequency starting point F0 should be adjusted to 100Hz.

[0080] Method 2

[0081] In Method 2, the third and fourth signals are transmitted in a time-division manner (or, time-domain division).

[0082] As an example, as shown in Figure 8, the third signal (i.e., the OFDM signal) and the fourth signal (e.g., the OTFS signal) are transmitted in a time-division manner.

[0083] In some implementations, a guard period (GP) is set between the frequency domain resources of the third and fourth signals transmitted in a time-division manner, as shown in Figure 9. This provides a stable transition time between the OFDM and OTFS signals, ensuring that the two different types of signals are not interfered with or lost during transmission.

[0084] The second signal may, for example, be located in a specific frequency band. This specific frequency band is associated with the modulation schemes of the first and second signals. For instance, certain specific frequency bands may be configured for transmitting signals obtained based on the first and second signal modulation schemes. A third signal obtained based on the first signal modulation scheme and a fourth signal obtained based on the second signal modulation scheme can be transmitted in a time-division manner on these specific frequency bands.

[0085] Method 3

[0086] In Method 3, the third and fourth signals are transmitted using a unified framework (e.g., an OFDM framework). For example, the implementation of the second signal modulation method includes steps associated with the first signal modulation method (i.e., OFDM). At this point, the fourth signal needs to be processed accordingly to convert the signal from the non-OFDM framework to the OFDM framework, so that it can be transmitted together with the third signal under the OFDM framework. This allows the transmitting and receiving devices to better utilize the two signal modulation methods without frequent switching between them. The following description uses OFDM as the first signal modulation method and the association of the second signal modulation method with OTFS as an example to illustrate the specific scheme of Method 3.

[0087] In some implementations, step 510, the modulation process of the first signal, may include: segmenting the first signal to obtain a first part and a second part; performing OFDM processing on the first part to obtain a third signal; and performing symplectic finite Fourier transform and OFDM processing (e.g., IFFT) on the second part to obtain a fourth signal. In this case, the modulation method of the first signal may be, for example, OFDM, including OFDM processing; the modulation method of the second signal may be associated with OTFS, including symplectic finite Fourier transform (e.g., ISFFT) processing.

[0088] For example, as shown in Figure 10, the first signal is segmented to obtain a first part and a second part. The first part is directly processed using OFDM. The second part, however, undergoes symplectic finite Fourier transform (e.g., ISFFT) to convert the time-delay Doppler domain signal into a time-frequency domain signal, enabling OFDM processing. In other words, the first part is an OFDM signal, and the second part is an OFDM signal. By performing different processing on the first and second parts respectively, and ultimately forming OFDM signals, the co-transmission of a third and fourth signal with different modulation schemes can be achieved within the same OFDM framework.

[0089] The second part can be, for example, a two-dimensional array of time delay and Doppler domains obtained based on a serial-to-parallel transform. That is, before performing symplectic finite Fourier transform, the signal needs to be subjected to a serial-to-parallel transform to obtain the input signal that meets the requirements of the symplectic finite Fourier transform. For example, as shown in Figure 11, performing a serial-to-parallel transform on signals x(10,10), ..., x(10,2), x(10,1), ..., x(1,10), ..., x(1,2), x(1,1) yields a two-dimensional array of time delay and Doppler domains, which serves as the input signal for the symplectic finite Fourier transform.

[0090] x(1,1);

[0091] x(1,2);

[0092] ...;

[0093] x(1,10);

[0094] x(10,1);

[0095] x(10,2);

[0096] ...;

[0097] x(10,10).

[0098] First, let's explain how to obtain the third signal by performing OFDM processing on the first part of the first signal. As an example, the process of performing OFDM processing on the first part can include performing Fourier processing (e.g., IFFT) on the first part to obtain the third signal. Taking the first part as a frequency domain signal and the third signal as a time domain signal as an example, the OFDM processing is equivalent to converting the frequency domain signal into a time domain signal through Fourier processing, for example, referring to the above formula (1).

[0099] Secondly, it explains how to obtain the fourth signal by performing symplectic finite Fourier transform and OFDM processing on the second part of the first signal. As an example, the process of performing symplectic finite Fourier transform and OFDM processing on the second part may include:

[0100] Step 1-1: Perform symplectic finite Fourier transform on the second part to obtain the discrete time-frequency domain signal;

[0101] Steps 1-2: Perform OFDM processing on the discrete time-frequency domain signal corresponding to each time-domain location in multiple time-domain locations to obtain the OFDM signal corresponding to each time-domain location;

[0102] Steps 1-3: Based on multiple OFDM signals corresponding to multiple time-domain locations, a fourth signal is obtained.

[0103] Taking the second part as a time-delayed Doppler domain signal and the fourth signal as a time-domain signal as an example, in the process of processing the second part to obtain the fourth part using steps 1-1 to 1-3 above, the second part of the time-delayed Doppler domain is converted into a discrete time-frequency domain signal through symplectic finite Fourier transform processing, and the discrete time-frequency domain signal corresponding to each time-domain position is converted into the corresponding OFDM signal through OFDM processing. Based on the OFDM signals corresponding to multiple time-domain positions, a continuous time-domain signal, i.e., the fourth signal, is formed. The OFDM processing here is similar to the above and can refer to the Fourier transform process (e.g., IFFT), for example, as shown in formula (1) above.

[0104] In this embodiment, the Fourier processing at the transmitting end can be considered an IFFT process, while the Fourier processing at the receiving end can be considered an FFT process, with the FFT process being the inverse of the IFFT process. Furthermore, the symplectic finite Fourier processing at the transmitting end can be considered an ISFFT process, while the symplectic finite Fourier processing at the receiving end can be considered an SFFT process, with the SFFT process being the inverse of the ISFFT process.

[0105] The following describes steps 1-1, 1-2, and 1-3 in detail with examples.

[0106] In step 1-1, the second part satisfies the following relationship with the discrete time-frequency domain signal:

[0107] Where x(k,l) is the second part, X(m,n) is the discrete time-frequency domain signal, k is the index of the time delay domain, k∈[0,M-1], l is the index of the Doppler domain, l∈[0,N-1], m is the index of the frequency domain, m∈[0,M-1], and n is the index of the time domain, n∈[0,N-1].

[0108] Based on formula (10), the second part can be converted into a discrete time-frequency domain signal.

[0109] In steps 1-2, the OFDM signal corresponding to each time domain location and the discrete time-frequency domain signal corresponding to each time domain location satisfy the following:

[0110] Where X(m,n) is the discrete time-frequency domain signal corresponding to time position n, m is the frequency domain index, m∈[0,M-1], n is the time domain index, n∈[0,N-1], d(n,t) is the OFDM signal corresponding to time position n, Δf is the subcarrier spacing, and T is the symbol transmission period.

[0111] Here, OFDM processing is performed on the signals X(m,n) corresponding to the same time-domain position n. That is, OFDM processing is performed on X(m,1), X(m,2), ..., X(m,N-1) respectively to obtain the OFDM signal for each time-domain position n.

[0112] It should be noted that the time domain position is represented by the time domain index n, and the frequency domain position is represented by the frequency domain index m. Similarly, the time delay domain and the Doppler domain also have their own indices k and l, respectively.

[0113] In steps 1-3, the fourth signal satisfies the following relationship with the multiple OFDM signals:

[0114] Where s(t) is the fourth signal, n is the time domain index, n∈[0,N-1], d(n,t) is the OFDM signal corresponding to time domain position n, gtx(t―nT) is the shaping filter, and T is the symbol transmission period.

[0115] Thus, the OFDM signal s(t) can be obtained. The transmitted signal can be regarded as a combination of two OFDM signals (i.e., the third signal and the fourth signal), wherein the size of the third signal and the size of the fourth signal can be the same or different, for example, the input data (or output data) can be the same or different.

[0116] Specifically, in the OTFS process, a continuous time-frequency domain signal can be obtained through the Hessenberg transform, for example, referring to the aforementioned formula (9):

[0117] Among them, g tx (t) represents the emitter shaping filter, Δf represents the subcarrier spacing, and T represents the symbol transmission period.

[0118] Furthermore, by transforming formula (9), we can obtain:

[0119] Among them, let:

[0120] Based on formulas (13) and (11), we can obtain the above formula (12):

[0121] The first part of the first signal is processed by OFDM to obtain the third signal under the OFDM framework, and the second part of the first signal is processed by symplectic finite Fourier transform and OFDM to obtain the fourth signal under the OFDM framework, thereby obtaining the second signal composed of the third signal and the fourth signal, which are then combined for radio frequency transmission.

[0122] The fourth signal can be combined with the third signal for transmission in the following ways. For example, the fourth signal and the third signal can be transmitted in series, that is, the results of the two OFDM transformations can be transmitted in series. Another example is that the result of adding the fourth signal and the third signal can be used as the transmitted signal, that is, the results of the two OFDM transformations can be added together and then transmitted simultaneously.

[0123] In some implementations, the fourth signal and the third signal can be mapped to different subcarriers for transmission. For example, the same subcarrier size can be configured for each cell, and the third and fourth signals can be mapped to different subcarriers within that cell. The data size (e.g., IFFT size) when processing the first and second portions of the first signal can be determined based on the size of the subcarrier.

[0124] As an example, in the case of the fourth signal and the third signal being transmitted in series, the fourth signal and the third signal can be transmitted in time division; in the case of the fourth signal and the third signal being transmitted after being added together, the fourth signal and the third signal can be mapped to different subcarriers within the same OFDM.

[0125] Similarly, after completing the above modulation process, a cyclic prefix needs to be added before the second signal in each time-domain symbol. This cyclic prefix must be greater than the maximum transmission delay of the second signal, i.e., it must satisfy the aforementioned formula T. CP >τ max , among which, T CP τ is the length of the cyclic prefix. max This represents the maximum transmission delay of the second signal.

[0126] Figure 12 shows a schematic flowchart of a wireless signal processing method provided in an embodiment of this application. The method 1200 shown in Figure 12 can be executed by a receiving end. The receiving end can be a terminal device, in which case the transmitting end can be a network device; or, the receiving end can be a network device, in which case the transmitting end can be a terminal device. The terminal device can be, for example, the terminal device 120 shown in Figure 1, and the network device can be, for example, the network device 110 shown in Figure 1.

[0127] Referring to Figure 12, in step 1210, the second signal is demodulated to obtain the first signal.

[0128] The second signal includes a third signal and a fourth signal. The first signal includes a first part obtained by demodulating the third signal using a demodulation method corresponding to the modulation method of the first signal, and a second part obtained by demodulating the fourth signal using a demodulation method corresponding to the modulation method of the second signal. The modulation method of the first signal includes OFDM, and the modulation method of the second signal is associated with signal modulation methods other than OFDM (e.g., OTFS, IFDM, ODDM, OCDM, LFM). In other words, when demodulating the third and fourth signals in the second signal, different demodulation methods are used (i.e., the demodulation method corresponding to the modulation method of the first signal and the demodulation method corresponding to the modulation method of the second signal), two signal parts are obtained respectively, namely the first part and the second part. The first part and the second part constitute the final demodulated signal, which is the first signal.

[0129] In some implementations, the third and fourth signals are transmitted using frequency division multiplexing. Furthermore, a guard band can be set between the frequency domain resources of the third and fourth signals transmitted using frequency division multiplexing.

[0130] In some implementations, the third and fourth signals are transmitted in a time-division manner. Furthermore, a guard interval can be set between the time-domain resources of the third and fourth signals transmitted in a time-division manner.

[0131] The second signal may, for example, be located in a specific frequency band. This specific frequency band is associated with the modulation scheme of the first signal and the modulation scheme of the second signal.

[0132] In some implementations, the implementation of the second signal modulation method includes steps associated with the first signal modulation method (i.e., OFDM).

[0133] In some implementations, the demodulation process of the second signal in step 1210 may include: performing OFDM processing on the third signal to obtain a first part; performing OFDM processing and symplectic finite Fourier transform processing on the fourth signal to obtain a second part; and performing a merging process based on the first part and the second part to obtain the first signal. In this case, the modulation method of the first signal may be, for example, OFDM, and the demodulation method corresponding to the modulation method of the first signal may include OFDM processing (e.g., FFT), etc.; the modulation method of the second signal may be associated with OTFS, for example, and the demodulation method corresponding to the modulation method of the second signal may include symplectic finite Fourier transform processing (e.g., SFFT), etc.

[0134] In some implementations, the OFDM processing of the third signal may include performing Fourier transform (e.g., FFT) on the third signal to obtain the first part. For example, the third signal may be a time-domain signal, and the first part may be a frequency-domain signal.

[0135] In some implementations, the process of performing OFDM processing and symplectic finite Fourier processing on the fourth signal may include:

[0136] Step 2-1: Based on the fourth signal, obtain multiple OFDM signals corresponding to multiple time-domain locations;

[0137] Step 2-2: Perform OFDM processing on the OFDM signal corresponding to each time domain location in multiple time domain locations to obtain the discrete time-frequency domain signal corresponding to each time domain location;

[0138] Steps 2-3: Based on the discrete time-frequency domain signals corresponding to multiple time-domain locations, perform symplectic finite Fourier processing to obtain the second part.

[0139] For example, the fourth signal is a time-domain signal, and the second part is a time-delay Doppler domain signal.

[0140] In some implementations, the second part is a two-dimensional array of time delay domain and Doppler domain. Method 1200 may also include: performing a parallel-to-serial transformation on the second part, wherein the second part after the parallel-to-serial transformation is used to determine the first signal.

[0141] In some implementations, the second part satisfies the following relationship with the discrete time-frequency domain signal:

[0142] Where x(k,l) is the second part, X(m,n) is the discrete time-frequency domain signal, k is the index of the time delay domain, k∈[0,M-1], l is the index of the Doppler domain, l∈[0,N-1], m is the index of the frequency domain, m∈[0,M-1], and n is the index of the time domain, n∈[0,N-1].

[0143] In some implementations, the OFDM signal corresponding to each time domain location satisfies the following relationship with the discrete time-frequency domain signal corresponding to each time domain location:

[0144] Where X(m,n) is the discrete time-frequency domain signal corresponding to time position n, m is the frequency domain index, m∈[0,M-1], n is the time domain index, n∈[0,N-1], d(n,t) is the OFDM signal corresponding to time position n, Δf is the subcarrier spacing, and T is the symbol transmission period.

[0145] In some implementations, the fourth signal satisfies the following relationship with multiple OFDM signals:

[0146] Where s(t) is the fourth signal, n is the time domain index, n∈[0,N-1], d(n,t) is the continuous time-frequency domain signal corresponding to time domain position n, gtx(t―nT) is the shaping filter, and T is the symbol transmission period.

[0147] In some implementations, method 1200 may further include: removing the cyclic prefix preceding the second signal on each time-domain symbol, wherein the cyclic prefix is ​​greater than the maximum transmission delay of the second signal.

[0148] In some implementations, the fourth signal is transmitted in series with the third signal; and / or, the fourth signal and the third signal are mapped to different subcarriers for transmission.

[0149] In some implementations, the size of the first part may be the same as or different from the size of the second part.

[0150] 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 processing of the fourth signal as an example, step 2-1 can be regarded as the inverse process of step 1-1 at the transmitting end; step 2-2 can be regarded as the inverse process of step 1-2 at the transmitting end; and step 2-3 can be regarded as the inverse process of step 1-3 at the transmitting end. It should be noted that, in the embodiments of this application, 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 content of the above steps at the receiving end can be referred to the aforementioned description for the transmitting end, and will not be repeated here for the sake of brevity.

[0151] The method embodiments of this application have been described in detail above with reference to Figures 1 to 12. The apparatus embodiments of this application will be described in detail below with reference to Figures 13 to 15. It should be understood that the descriptions of the method embodiments correspond to the descriptions of the apparatus embodiments; therefore, any parts not described in detail can be referred to the preceding method embodiments.

[0152] Figure 13 is a schematic diagram of the structure of a transmitting device provided in an embodiment of this application. The transmitting device 1300 shown in Figure 13 may include a processing unit 1310. The processing unit 1310 is used to: modulate a first signal to obtain a second signal; wherein the second signal includes a third signal obtained based on the first signal modulation method and a fourth signal obtained based on the second signal modulation method, the first signal modulation method includes OFDM, and the second signal modulation method includes signal modulation methods other than OFDM.

[0153] In some implementations, the second signal modulation scheme is associated with one or more of OTFS, IFDM, ODDM, OCDM, and LFM.

[0154] In some implementations, the third signal and the fourth signal are transmitted in a frequency-division manner; or, the third signal and the fourth signal are transmitted in a time-division manner.

[0155] In some implementations, a guard band is provided between the frequency domain resources of the third signal and the fourth signal transmitted in a frequency division manner; and / or, a guard interval is provided between the time domain resources of the third signal and the fourth signal transmitted in a time division manner.

[0156] In some implementations, the second signal is located in a specific frequency band, which is a frequency band associated with the modulation scheme of the first signal and the modulation scheme of the second signal.

[0157] In some implementations, the implementation process of the second signal modulation method includes steps associated with the first signal modulation method.

[0158] In some implementations, the processing unit 1310 is specifically used to: segment the first signal to obtain a first part and a second part; perform OFDM processing on the first part to obtain the third signal; and perform symplectic finite Fourier processing and OFDM processing on the second part to obtain the fourth signal.

[0159] In some implementations, the first part is a frequency domain signal, and the third signal is a time domain signal.

[0160] In some implementations, the processing unit 1310 is specifically used to: perform Fourier processing on the first part to obtain the third signal.

[0161] In some implementations, the second part is a time-delayed Doppler domain signal, and the fourth signal is a time-domain signal.

[0162] In some implementations, the processing unit 1310 is specifically used to: perform symplectic finite Fourier processing on the second part to obtain a discrete time-frequency domain signal; perform OFDM processing on the discrete time-frequency domain signal corresponding to each time-domain position in a plurality of time-domain positions to obtain an OFDM signal corresponding to each time-domain position; and obtain the fourth signal based on the plurality of OFDM signals corresponding to the plurality of time-domain positions.

[0163] In some implementations, the second part is a two-dimensional array of time delay domain and Doppler domain obtained based on serial-to-parallel transformation.

[0164] In some implementations, the second part satisfies the following relationship with the discrete time-frequency domain signal: Where x(k,l) is the second part, X(m,n) is the discrete time-frequency domain signal, k is the index of the time delay domain, k∈[0,M-1], l is the index of the Doppler domain, l∈[0,N-1], m is the index of the frequency domain, m∈[0,M-1], and n is the index of the time domain, n∈[0,N-1].

[0165] In some implementations, the OFDM signal corresponding to each time domain location and the discrete time-frequency domain signal corresponding to each time domain location satisfy the following: Where X(m,n) is the discrete time-frequency domain signal corresponding to time position n, m is the frequency domain index, m∈[0,M-1], n is the time domain index, n∈[0,N-1], d(n,t) is the OFDM signal corresponding to time position n, Δf is the subcarrier spacing, and T is the symbol transmission period.

[0166] In some implementations, the fourth signal and the plurality of OFDM signals satisfy the following: Wherein, s(t) is the fourth signal, n is the time domain index, n∈[0,N-1], d(n,t) is the OFDM signal corresponding to time domain position n, gtx(t―nT) is the shaping filter, and T is the symbol transmission period.

[0167] In some implementations, the processing unit 1310 is further configured to: add a cyclic prefix before the second signal in each time domain symbol, wherein the cyclic prefix is ​​greater than the maximum transmission delay of the second signal.

[0168] In some implementations, the fourth signal is transmitted in series with the third signal; and / or, the fourth signal and the third signal are mapped to different subcarriers for transmission.

[0169] In some implementations, the size of the third signal may be the same as or different from the size of the fourth signal.

[0170] It is understood that the processing unit 1310 may be, for example, a processor 1510. Additionally, the transmitting device 1300 may optionally include a transceiver 1530 and a memory 1520, as detailed in Figure 15.

[0171] Figure 14 is a schematic diagram of the structure of a receiving device provided in an embodiment of this application. The receiving device 1400 shown in Figure 14 may include a processing unit 1410. The processing unit 1410 is used to: demodulate a second signal to obtain a first signal; wherein the second signal includes a third signal and a fourth signal, the first signal includes a first part obtained by demodulating the third signal based on the demodulation method corresponding to the first signal modulation method, and a second part obtained by demodulating the fourth signal based on the demodulation method corresponding to the second signal modulation method, wherein the first signal modulation method includes OFDM, and the second signal modulation method includes signal modulation methods other than OFDM.

[0172] In some implementations, the second signal modulation scheme is associated with one or more of OTFS, IFDM, ODDM, OCDM, and LFM.

[0173] In some implementations, the third signal and the fourth signal are transmitted in a frequency-division manner; or, the third signal and the fourth signal are transmitted in a time-division manner.

[0174] In some implementations, a guard band is provided between the frequency domain resources of the third signal and the fourth signal transmitted in a frequency division manner; and / or, a guard interval is provided between the time domain resources of the third signal and the fourth signal transmitted in a time division manner.

[0175] In some implementations, the second signal is located in a specific frequency band, which is a frequency band associated with the modulation scheme of the first signal and the modulation scheme of the second signal.

[0176] In some implementations, the implementation process of the second signal modulation method includes steps associated with the first signal modulation method.

[0177] In some implementations, the processing unit 1410 is specifically used to: perform OFDM processing on the third signal to obtain the first part; perform OFDM processing and symplectic finite Fourier processing on the fourth signal to obtain the second part; and perform merging processing based on the first part and the second part to obtain the first signal.

[0178] In some implementations, the third signal is a time-domain signal, and the first part is a frequency-domain signal.

[0179] In some implementations, the processing unit 1410 is specifically used to: perform Fourier processing on the third signal to obtain the first part.

[0180] In some implementations, the fourth signal is a time-domain signal, and the second part is a time-delay Doppler domain signal.

[0181] In some implementations, the processing unit 1410 is specifically used to: obtain multiple OFDM signals corresponding to multiple time-domain locations based on the fourth signal; perform OFDM processing on the OFDM signal corresponding to each of the multiple time-domain locations to obtain a discrete time-frequency domain signal corresponding to each time-domain location; and perform symplectic finite Fourier processing on the discrete time-frequency domain signal corresponding to the multiple time-domain locations to obtain the second part.

[0182] In some implementations, the second part is a two-dimensional array of time delay domain and Doppler domain, and the processing unit 1410 is further configured to: perform parallel-to-serial conversion on the second part, wherein the second part after parallel-to-serial conversion is used to determine the first signal.

[0183] In some implementations, the second part satisfies the following relationship with the discrete time-frequency domain signal: Where x(k,l) is the second part, X(m,n) is the discrete time-frequency domain signal, k is the index of the time delay domain, k∈[0,M-1], l is the index of the Doppler domain, l∈[0,N-1], m is the index of the frequency domain, m∈[0,M-1], and n is the index of the time domain, n∈[0,N-1].

[0184] In some implementations, the OFDM signal corresponding to each time domain location and the discrete time-frequency domain signal corresponding to each time domain location satisfy the following: Where X(m,n) is the discrete time-frequency domain signal corresponding to time position n, m is the frequency domain index, m∈[0,M-1], n is the time domain index, n∈[0,N-1], d(n,t) is the OFDM signal corresponding to time position n, Δf is the subcarrier spacing, and T is the symbol transmission period.

[0185] In some implementations, the fourth signal and the plurality of OFDM signals satisfy the following: Wherein, s(t) is the fourth signal, n is the time domain index, n∈[0,N-1], d(n,t) is the continuous time-frequency domain signal corresponding to time domain position n, gtx(t―nT) is the shaping filter, and T is the symbol transmission period.

[0186] In some implementations, the processing unit 1410 is further configured to: remove the cyclic prefix preceding the second signal on each time-domain symbol, wherein the cyclic prefix is ​​greater than the maximum transmission delay of the second signal.

[0187] In some implementations, the fourth signal is transmitted in series with the third signal; and / or, the fourth signal and the third signal are mapped to different subcarriers for transmission.

[0188] In some implementations, the size of the first part may be the same as or different from the size of the second part.

[0189] It is understood that the processing unit 1410 may be, for example, a processor 1510. Additionally, the receiving device 1400 may optionally include a memory 1520 and a transceiver 1530, as detailed in Figure 15.

[0190] Figure 15 is a schematic structural diagram of a communication apparatus according to an embodiment of this application. The dashed lines in Figure 15 indicate that the unit or module is optional. The apparatus 1500 can be used to implement the methods described in the above method embodiments. The apparatus 1500 may be, for example, a chip, a terminal device, or a network device.

[0191] Apparatus 1500 may include one or more processors 1510. Processor 1510 may support apparatus 1500 in implementing the methods described in the foregoing method embodiments. Processor 1510 may be a general-purpose processor or a special-purpose processor. For example, processor 1510 may be a central processing unit (CPU). Alternatively, processor 1510 may also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. General-purpose processors may be microprocessors or any conventional processor.

[0192] The apparatus 1500 may further include one or more memories 1520. The memories 1520 store programs that can be executed by the processor 1510, causing the processor 1510 to perform the methods described in the above method embodiments. The memories 1520 may be independent of the processor 1510, or they may be integrated into the processor 1510.

[0193] The device 1500 may also include a transceiver 1530. The processor 1510 can communicate with other devices or chips via the transceiver 1530. For example, the processor 1510 can send and receive data with other devices or chips via the transceiver 1530.

[0194] This application also provides a communication system. The communication system includes the aforementioned transmitting device and receiving device. In some implementations, the system further includes other devices that interact with the transmitting device and the receiving device.

[0195] This application also provides a computer-readable storage medium for storing a program. This computer-readable storage medium can be applied to a transmitting or receiving device provided in this application, and the program causes a computer to execute the methods performed by the transmitting or receiving device in various embodiments of this application.

[0196] This application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to a transmitting or receiving device provided in the embodiments of this application, and the program causes a computer to execute the methods performed by the transmitting or receiving device in the various embodiments of this application.

[0197] This application also provides a computer program. This computer program can be applied to the transmitting or receiving device provided in the embodiments of this application, and the computer program causes the computer to execute the methods performed by the transmitting or receiving device in the various embodiments of this application.

[0198] It should be understood that the terms "system" and "network" in the embodiments of this application can be used interchangeably. Furthermore, the terminology used in this application is only for explaining specific embodiments of this application and is not intended to limit this application. The terms "first," "second," "third," and "fourth," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. In addition, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0199] In the embodiments of this application, the term "instruction" can be a direct instruction, an indirect instruction, or an indication of a relationship. For example, A instructing B can mean that A directly instructs B, such as B being able to obtain information through A; it can also mean that A indirectly instructs B, such as A instructing C, so B can obtain information through C; or it can mean that there is a relationship between A and B.

[0200] In the embodiments of this application, "B corresponding to A" means that B is associated with A, and B can be determined based on A. However, it should also be understood that determining B based on A does not mean that B is determined solely based on A; B can also be determined based on A and / or other information.

[0201] In the embodiments of this application, the term "correspondence" can indicate a direct or indirect correspondence between two things, or an association between two things, or a relationship such as instruction and being instructed, configuration and being configured.

[0202] In this application embodiment, "predefined" or "preconfigured" can be implemented by pre-storing corresponding codes, tables, or other means that can be used to indicate relevant information in the device (e.g., including the sending end device and the receiving end device). This application does not limit the specific implementation method. For example, predefined can refer to what is defined in the protocol.

[0203] In this application embodiment, the "protocol" may refer to a standard protocol in the field of communication, such as the LTE protocol, the NR protocol, and related protocols applied to future communication systems. This application does not limit this.

[0204] In the embodiments of this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0205] In the various embodiments of this application, the order of the above-mentioned processes does not imply 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 this application.

[0206] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0207] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0208] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0209] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially 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, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can read or a data storage device such as a server or data center that integrates one or more available media. The available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs (DVDs)), or semiconductor media (e.g., solid-state disks (SSDs)).

[0210] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A signal processing method, characterized by, include: The first signal is modulated to obtain the second signal; The second signal includes a third signal obtained based on the first signal modulation method and a fourth signal obtained based on the second signal modulation method. The first signal modulation method includes orthogonal frequency division multiplexing (OFDM), and the second signal modulation method includes signal modulation methods other than OFDM.

2. The method of claim 1, wherein, The second signal modulation method is associated with one or more of the following: Orthogonal Time-Frequency Space (OTFS); Interleaved Frequency Division Multiplexing (IFDM); Orthogonal Delay Doppler Multiplexing (ODDM); Orthogonal linear frequency modulation wavelength division multiplexing (OCDM); Linear frequency modulation (LFM).

3. The method according to claim 1 or 2, characterized in that, The third signal and the fourth signal are transmitted using frequency division; or... The third signal and the fourth signal are transmitted in a time-division manner.

4. The method of claim 3, wherein, A guard band is provided between the frequency domain resources of the third signal and the fourth signal transmitted in a frequency division manner; and / or, a guard interval is provided between the time domain resources of the third signal and the fourth signal transmitted in a time division manner.

5. The method according to any one of claims 1 to 4, characterized in that, The second signal is located in a specific frequency band, which is a frequency band associated with the modulation scheme of the first signal and the modulation scheme of the second signal.

6. The method according to any one of claims 1 to 5, characterized in that, The implementation process of the second signal modulation method includes steps associated with the first signal modulation method.

7. The method according to any one of claims 1 to 6, characterized in that, The modulation processing of the first signal to obtain the second signal includes: The first signal is segmented to obtain a first part and a second part; The first part is processed by OFDM to obtain the third signal; The second part is subjected to symplectic finite Fourier transform and OFDM processing to obtain the fourth signal.

8. The method according to claim 7, characterized in that, The second part is a time-delayed Doppler domain signal, and the fourth signal is a time-domain signal. The process of performing symplectic finite Fourier transform and OFDM processing on the second part to obtain the fourth signal includes: The second part is subjected to symplectic finite Fourier transform to obtain a discrete time-frequency domain signal; OFDM processing is performed on the discrete time-frequency domain signal corresponding to each of the multiple time-domain locations to obtain the OFDM signal corresponding to each time-domain location. The fourth signal is obtained based on the multiple OFDM signals corresponding to the multiple time-domain locations.

9. The method according to claim 8, characterized in that, The second part satisfies the following relationship with the discrete time-frequency domain signal: Where x(k,l) is the second part, X(m,n) is the discrete time-frequency domain signal, k is the index of the time delay domain, k∈[0,M-1], l is the index of the Doppler domain, l∈[0,N-1], m is the index of the frequency domain, m∈[0,M-1], and n is the index of the time domain, n∈[0,N-1].

10. The method according to claim 8 or 9, characterized in that, The OFDM signal corresponding to each time domain position and the discrete time-frequency domain signal corresponding to each time domain position satisfy the following: Where X(m,n) is the discrete time-frequency domain signal corresponding to time position n, m is the frequency domain index, m∈[0,M-1], n is the time domain index, n∈[0,N-1], d(n,t) is the OFDM signal corresponding to time position n, Δf is the subcarrier spacing, and T is the symbol transmission period.

11. The method according to any one of claims 8 to 10, characterized in that, The fourth signal and the plurality of OFDM signals satisfy the following: Where s(t) is the fourth signal, n is the time-domain index, n∈[0,N-1], d(n,t) is the OFDM signal corresponding to time-domain position n, and g tx (t―nT) is the shaping filter, and T is the symbol emission period.

12. The method according to any one of claims 7 to 11, characterized in that, The fourth signal is transmitted in series with the third signal; and / or, The fourth signal is mapped to different subcarriers for transmission compared to the third signal.

13. The method according to any one of claims 7 to 12, characterized in that, The size of the third signal may be the same as or different from the size of the fourth signal.

14. A signal processing method, characterized in that, include: The second signal is demodulated to obtain the first signal; The second signal includes a third signal and a fourth signal. The first signal includes a first part obtained by demodulating the third signal based on the demodulation method corresponding to the first signal modulation method, and a second part obtained by demodulating the fourth signal based on the demodulation method corresponding to the second signal modulation method. The first signal modulation method includes orthogonal frequency division multiplexing (OFDM), and the second signal modulation method includes signal modulation methods other than OFDM.

15. The method according to claim 14, characterized in that, The second signal modulation method is associated with one or more of the following: Orthogonal Time-Frequency Space (OTFS); Interleaved Frequency Division Multiplexing (IFDM); Orthogonal Delay Doppler Multiplexing (ODDM); Orthogonal linear frequency modulation wavelength division multiplexing (OCDM); Linear frequency modulation (LFM).

16. The method according to claim 14 or 15, characterized in that, The third signal and the fourth signal are transmitted using frequency division; or... The third signal and the fourth signal are transmitted in a time-division manner.

17. The method according to claim 16, characterized in that, A guard band is provided between the frequency domain resources of the third signal and the fourth signal transmitted in a frequency division manner; and / or, a guard interval is provided between the time domain resources of the third signal and the fourth signal transmitted in a time division manner.

18. The method according to any one of claims 14 to 17, characterized in that, The second signal is located in a specific frequency band, which is a frequency band associated with the modulation scheme of the first signal and the modulation scheme of the second signal.

19. The method according to any one of claims 14 to 18, characterized in that, The implementation process of the second signal modulation method includes steps associated with the first signal modulation method.

20. The method according to any one of claims 14 to 19, characterized in that, The demodulation process of the second signal to obtain the first signal includes: The third signal is processed using OFDM to obtain the first part; The fourth signal is processed by OFDM and symplectic finite Fourier transform to obtain the second part; The first signal is obtained by merging the first part and the second part.

21. The method according to claim 20, characterized in that, The fourth signal is a time-domain signal, and the second part is a time-delay Doppler domain signal. The second part is obtained by performing OFDM processing and symplectic finite Fourier processing on the fourth signal, including: Based on the fourth signal, multiple OFDM signals corresponding to multiple time-domain locations are obtained; OFDM processing is performed on the OFDM signal corresponding to each of the multiple time-domain locations to obtain the discrete time-frequency domain signal corresponding to each time-domain location. Based on the discrete time-frequency domain signals corresponding to the multiple time-domain locations, symplectic finite Fourier processing is performed to obtain the second part.

22. The method according to claim 21, characterized in that, The second part satisfies the following relationship with the discrete time-frequency domain signal: Where x(k,l) is the second part, X(m,n) is the discrete time-frequency domain signal, k is the index of the time delay domain, k∈[0,M-1], l is the index of the Doppler domain, l∈[0,N-1], m is the index of the frequency domain, m∈[0,M-1], and n is the index of the time domain, n∈[0,N-1].

23. The method according to claim 21 or 22, characterized in that, The OFDM signal corresponding to each time domain position and the discrete time-frequency domain signal corresponding to each time domain position satisfy the following: Where X(m,n) is the discrete time-frequency domain signal corresponding to time position n, m is the frequency domain index, m∈[0,M-1], n is the time domain index, n∈[0,N-1], d(n,t) is the OFDM signal corresponding to time position n, Δf is the subcarrier spacing, and T is the symbol transmission period.

24. The method according to any one of claims 21 to 23, characterized in that, The fourth signal and the plurality of OFDM signals satisfy the following: Where s(t) is the fourth signal, n is the time-domain index, n∈[0,N-1], d(n,t) is the continuous time-frequency domain signal corresponding to time-domain position n, and g tx (t―nT) is the shaping filter, and T is the symbol emission period.

25. The method according to any one of claims 20 to 24, characterized in that, The fourth signal is transmitted in series with the third signal; and / or, The fourth signal is mapped to different subcarriers for transmission compared to the third signal.

26. The method according to any one of claims 20 to 25, characterized in that, The dimensions of the first part may be the same as or different from the dimensions of the second part.

27. A receiving device, characterized in that, include: A processing unit is used to modulate the first signal to obtain a second signal; The second signal includes a third signal obtained based on the first signal modulation method and a fourth signal obtained based on the second signal modulation method. The first signal modulation method includes orthogonal frequency division multiplexing (OFDM), and the second signal modulation method includes signal modulation methods other than OFDM.

28. The receiving device according to claim 27, characterized in that, The second signal modulation method is associated with one or more of the following: Orthogonal time-frequency spatial OTFS correlation; Interleaved Frequency Division Multiplexing (IFDM); Orthogonal Delay Doppler Multiplexing (ODDM); Orthogonal linear frequency modulation wavelength division multiplexing (OCDM); Linear frequency modulation (LFM).

29. The receiving device according to claim 27 or 28, characterized in that, The third signal and the fourth signal are transmitted using frequency division; or... The third signal and the fourth signal are transmitted in a time-division manner.

30. The receiving device according to claim 29, characterized in that, A guard band is provided between the frequency domain resources of the third signal and the fourth signal transmitted in a frequency division manner; and / or, a guard interval is provided between the time domain resources of the third signal and the fourth signal transmitted in a time division manner.

31. The receiving end device according to any one of claims 27 to 30, characterized in that, The second signal is located in a specific frequency band, which is a frequency band associated with the modulation scheme of the first signal and the modulation scheme of the second signal.

32. The receiving end device according to any one of claims 27 to 31, characterized in that, The implementation process of the second signal modulation method includes steps associated with the first signal modulation method.

33. The receiving end device according to any one of claims 27 to 32, characterized in that, The processing unit is specifically used for: The first signal is segmented to obtain a first part and a second part; The first part is processed by OFDM to obtain the third signal; The second part is subjected to symplectic finite Fourier transform and OFDM processing to obtain the fourth signal.

34. The receiving device according to claim 33, characterized in that, The second part is a time-delayed Doppler domain signal, and the fourth signal is a time-domain signal. Specifically, the processing unit is used for: The second part is subjected to symplectic finite Fourier transform to obtain a discrete time-frequency domain signal; OFDM processing is performed on the discrete time-frequency domain signal corresponding to each of the multiple time-domain locations to obtain the OFDM signal corresponding to each time-domain location. The fourth signal is obtained based on the multiple OFDM signals corresponding to the multiple time-domain locations.

35. The receiving device according to claim 34, characterized in that, The second part satisfies the following relationship with the discrete time-frequency domain signal: Where x(k,l) is the second part, X(m,n) is the discrete time-frequency domain signal, k is the index of the time delay domain, k∈[0,M-1], l is the index of the Doppler domain, l∈[0,N-1], m is the index of the frequency domain, m∈[0,M-1], and n is the index of the time domain, n∈[0,N-1].

36. The receiving device according to claim 34 or 35, characterized in that, The OFDM signal corresponding to each time domain position and the discrete time-frequency domain signal corresponding to each time domain position satisfy the following: Where X(m,n) is the discrete time-frequency domain signal corresponding to time position n, m is the frequency domain index, m∈[0,M-1], n is the time domain index, n∈[0,N-1], d(n,t) is the OFDM signal corresponding to time position n, Δf is the subcarrier spacing, and T is the symbol transmission period.

37. The receiving end device according to any one of claims 34 to 36, characterized in that, The fourth signal and the plurality of OFDM signals satisfy the following: Where s(t) is the fourth signal, n is the time-domain index, n∈[0,N-1], d(n,t) is the OFDM signal corresponding to time-domain position n, and g tx (t―nT) is the shaping filter, and T is the symbol emission period.

38. The receiving end device according to any one of claims 33 to 37, characterized in that, The fourth signal is transmitted in series with the third signal; and / or, The fourth signal is mapped to different subcarriers for transmission compared to the third signal.

39. The receiving end device according to any one of claims 33 to 38, characterized in that, The size of the third signal may be the same as or different from the size of the fourth signal.

40. A transmitting device, characterized in that, include: The processing unit is used to demodulate the second signal to obtain the first signal; The second signal includes a third signal and a fourth signal. The first signal includes a first part obtained by demodulating the third signal based on the demodulation method corresponding to the first signal modulation method, and a second part obtained by demodulating the fourth signal based on the demodulation method corresponding to the second signal modulation method. The first signal modulation method includes orthogonal frequency division multiplexing (OFDM), and the second signal modulation method includes signal modulation methods other than OFDM.

41. The transmitting device according to claim 40, characterized in that, The second signal modulation method is associated with one or more of the following: Orthogonal Time-Frequency Space (OTFS); Interleaved Frequency Division Multiplexing (IFDM); Orthogonal Delay Doppler Multiplexing (ODDM); Orthogonal linear frequency modulation wavelength division multiplexing (OCDM); Linear frequency modulation (LFM).

42. The transmitting end device according to claim 40 or 41, characterized in that, The third signal and the fourth signal are transmitted using frequency division; or... The third signal and the fourth signal are transmitted in a time-division manner.

43. The transmitting device according to claim 42, characterized in that, A guard band is provided between the frequency domain resources of the third signal and the fourth signal transmitted in a frequency division manner; and / or, a guard interval is provided between the time domain resources of the third signal and the fourth signal transmitted in a time division manner.

44. The transmitting end device according to any one of claims 40 to 43, characterized in that, The second signal is located in a specific frequency band, which is a frequency band associated with the modulation scheme of the first signal and the modulation scheme of the second signal.

45. The transmitting end device according to any one of claims 40 to 44, characterized in that, The implementation process of the second signal modulation method includes steps associated with the first signal modulation method.

46. ​​The transmitting end device according to any one of claims 40 to 45, characterized in that, The processing unit is specifically used for: The third signal is processed using OFDM to obtain the first part; The fourth signal is processed by OFDM and symplectic finite Fourier transform to obtain the second part; The first signal is obtained by merging the first part and the second part.

47. The transmitting device according to claim 46, characterized in that, The fourth signal is a time-domain signal, and the second part is a time-delay Doppler domain signal. Specifically, the processing unit is used for: Based on the fourth signal, multiple OFDM signals corresponding to multiple time-domain locations are obtained; OFDM processing is performed on the OFDM signal corresponding to each of the multiple time-domain locations to obtain the discrete time-frequency domain signal corresponding to each time-domain location. Based on the discrete time-frequency domain signals corresponding to the multiple time-domain locations, symplectic finite Fourier processing is performed to obtain the second part.

48. The transmitting device according to claim 47, characterized in that, The second part satisfies the following relationship with the discrete time-frequency domain signal: Where x(k,l) is the second part, X(m,n) is the discrete time-frequency domain signal, k is the index of the time delay domain, k∈[0,M-1], l is the index of the Doppler domain, l∈[0,N-1], m is the index of the frequency domain, m∈[0,M-1], and n is the index of the time domain, n∈[0,N-1].

49. The transmitting device according to claim 47 or 48, characterized in that, The OFDM signal corresponding to each time domain position and the discrete time-frequency domain signal corresponding to each time domain position satisfy the following: Where X(m,n) is the discrete time-frequency domain signal corresponding to time position n, m is the frequency domain index, m∈[0,M-1], n is the time domain index, n∈[0,N-1], d(n,t) is the OFDM signal corresponding to time position n, Δf is the subcarrier spacing, and T is the symbol transmission period.

50. The transmitting end device according to any one of claims 47 to 49, characterized in that, The fourth signal and the plurality of OFDM signals satisfy the following: Where s(t) is the fourth signal, n is the time-domain index, n∈[0,N-1], d(n,t) is the continuous time-frequency domain signal corresponding to time-domain position n, and g tx (t―nT) is the shaping filter, and T is the symbol emission period.

51. The transmitting end device according to any one of claims 46 to 50, characterized in that, The fourth signal is transmitted in series with the third signal; and / or, The fourth signal is mapped to different subcarriers for transmission compared to the third signal.

52. The transmitting end device according to any one of claims 46 to 51, characterized in that, The dimensions of the first part may be the same as or different from the dimensions of the second part.

53. A transmitting device, characterized in that, The device includes a transceiver, a memory, and a processor. The memory stores a program, and the processor invokes the program in the memory and controls the transceiver to receive or transmit signals so that the transmitting device performs the method according to any one of claims 1 to 13.

54. A receiving device, characterized in that, The device includes a transceiver, a memory, and a processor. The memory stores a program, and the processor invokes the program in the memory and controls the transceiver to receive or transmit signals so that the receiving device performs the method according to any one of claims 14 to 26.

55. An apparatus, characterized in that, Includes a processor for calling a program from memory to cause the apparatus to perform the method according to any one of claims 1 to 26.

56. A chip, characterized in that, Includes a processor for calling a program from memory, causing a device on which the chip is mounted to perform the method according to any one of claims 1 to 26.

57. A computer-readable storage medium, characterized in that, It contains a program that causes a computer to perform the method according to any one of claims 1 to 26.

58. A computer program product, characterized in that, Includes a program that causes a computer to perform the method according to any one of claims 1 to 26.

59. A computer program, characterized in that, The computer program causes the computer to perform the method according to any one of claims 1 to 26.

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