Communication method and communication device

Abstract

The invention provides a communication method and communication equipment. The method comprises the following steps: a first device sends a first signal to a second device; wherein the first signal is generated after the first device performs precoding on a plurality of transmission layer signals, and the precoding comprises performing phase adjustment on one or more of the plurality of transmission layer signals; the first signal is a signal based on a discrete Fourier transform spread spectrum orthogonal frequency division multiplexing (DFT-S-OFDM) waveform. According to the method, the phase relation of one or more transmission layer signals is adjusted, so that the phases of the multiple transmission layer signals are distinguished in the transmission process, the phenomenon that too high instantaneous power is generated due to same-phase superposition is avoided, and the peak-to-average power ratio of the signals after multi-layer combination is effectively reduced.

Description

Technical Field

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

[0002] In waveform design for communication systems, cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) and discrete fourier transform-spread orthogonal frequency division multiplexing (DFT-S-OFDM) are two widely used fundamental waveforms. CP-OFDM can support multiple-input multiple-output (MIMO) transmission, thus significantly improving spectral efficiency and system capacity, but its peak-to-average power ratio (PAPR) is relatively high, resulting in weaker coverage. DFT-S-OFDM, with its lower PAPR, exhibits outstanding coverage, but it currently only supports single-layer transmission and cannot fully utilize the spatial multiplexing and diversity gain of MIMO technology.

[0003] In response to the comprehensive requirements of future communication systems for high capacity, wide coverage, and high energy efficiency, how to simultaneously support MIMO transmission and maintain low PAPR characteristics in a single waveform scheme has become an urgent technical problem to be solved in waveform design. Summary of the Invention

[0004] This application provides a communication method and a communication device. The various aspects covered by this application are described below.

[0005] In a first aspect, a communication method is provided, comprising: a first device sending a first signal to a second device; wherein the first signal is generated by the first device after precoding a plurality of transport layer signals, the precoding including phase adjustment of one or more of the plurality of transport layer signals; and the first signal is a signal based on a Discrete Fourier Transform Spread Spectrum Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) waveform.

[0006] In a second aspect, a communication method is provided, comprising: a second device receiving a first signal sent by a first device; wherein the first signal is generated by the first device after precoding a plurality of transport layer signals, the precoding including phase adjustment of one or more of the plurality of transport layer signals; and the first signal is a signal based on a Discrete Fourier Transform Spread Spectrum Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) waveform.

[0007] Thirdly, a communication method is provided, comprising: a first device sending a first signal to a second device; wherein the first signal is generated by the first device after precoding a plurality of transport layer signals, the precoding including phase adjustment of one or more of the plurality of transport layer signals; the first signal is a signal based on a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform.

[0008] Fourthly, a communication method is provided, comprising: a second device receiving a first signal sent by a first device; wherein the first signal is generated by the first device after precoding a plurality of transport layer signals, the precoding including phase adjustment of one or more of the plurality of transport layer signals; and the first signal is a signal based on a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform.

[0009] Fifthly, a communication device is provided, the communication device being a first device, the communication device comprising: a first transmitting unit for transmitting a first signal to a second device; wherein the first signal is generated by the first device after precoding multiple transport layer signals, the precoding including phase adjustment of one or more of the multiple transport layer signals; the first signal is a signal based on a Discrete Fourier Transform Spread Spectrum Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) waveform.

[0010] In a sixth aspect, a communication device is provided, the communication device being a second device, the communication device comprising: a first receiving unit for receiving a first signal transmitted by a first device; wherein the first signal is generated by the first device after precoding a plurality of transport layer signals, the precoding including phase adjustment of one or more of the plurality of transport layer signals; the first signal is a signal based on a Discrete Fourier Transform Spread Spectrum Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) waveform.

[0011] In a seventh aspect, a communication device is provided, the communication device being a first device, the communication device comprising: a first transmitting unit for transmitting a first signal to a second device; wherein the first signal is generated by the first device after precoding a plurality of transport layer signals, the precoding including phase adjustment of one or more of the plurality of transport layer signals; the first signal is a signal based on a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform.

[0012] Eighthly, a communication device is provided, the communication device being a second device, the communication device comprising: a first receiving unit for receiving a first signal transmitted by a first device; wherein the first signal is generated by the first device after precoding a plurality of transport layer signals, the precoding including phase adjustment of one or more of the plurality of transport layer signals; the first signal is a signal based on a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform.

[0013] A ninth aspect provides a communication device, which is a first device, comprising: a transceiver, a memory, and a processor, wherein 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 communication device performs some or all of the steps in the method of the first or third aspect.

[0014] In a tenth aspect, a communication device is provided, the communication device being a second device, the communication device comprising: a transceiver, a memory, and a processor, the memory being used to store a program, the processor being used to invoke the program in the memory, and to control the transceiver to receive or transmit signals, so that the communication device performs some or all of the steps in the method of the second or fourth aspect.

[0015] Eleventhly, embodiments of this application provide a communication system including the aforementioned communication device. In another possible design, the system may further include other devices that interact with the communication device as described in the embodiments of this application.

[0016] In a twelfth aspect, embodiments of this application provide a communication device including a memory and a processor, the processor being able to call and run a computer program from the memory to cause the device to perform some or all of the steps described in the methods of the foregoing aspects.

[0017] In a thirteenth aspect, embodiments of this application provide a chip including a memory and a processor, the processor being able to call and run a computer program from the memory, causing a device having the chip mounted to perform some or all of the steps described in the methods of the foregoing aspects.

[0018] In a fourteenth aspect, a computer-readable storage medium is provided, the computer-readable storage medium storing a computer program that causes a communication device to perform some or all of the steps of the methods described in the foregoing aspects.

[0019] In a fifteenth aspect, a computer program product is provided, comprising a non-transitory computer-readable storage medium storing a computer program operable to cause a communication device to perform some or all of the steps of the methods described in the foregoing aspects. In some implementations, the computer program product may be a software installation package.

[0020] This application proposes a precoding method that includes adjusting the phase relationship of one or more transmission layer signals in MIMO transmission, thereby changing the phase offset of signals between different transmission layers, so that the phases of multiple transmission layer signals are distinguished during transmission, avoiding excessively high instantaneous power due to the superposition of in-phase signals, thereby effectively reducing the PAPR of the multi-layer combined signal. Attached Figure Description

[0021] Figure 1 This is a system architecture example diagram of a wireless communication system to which embodiments of this application can be applied.

[0022] Figure 2 This is a block diagram illustrating the implementation of combining DFT-S-OFDM waveforms with MIMO transmission.

[0023] Figures 3(a) to 3(d) are example diagrams of the timing of precoding operations.

[0024] Figure 4 This is a flowchart illustrating the communication method provided in an embodiment of this application.

[0025] Figures 5(a) to 5(d) are example diagrams of the timing of phase adjustment operations.

[0026] Figure 6 This is a schematic diagram of the structure of a communication device provided in an embodiment of this application.

[0027] Figure 7 This is a schematic diagram of the structure of another communication device provided in the embodiments of this application.

[0028] Figure 8 This is a schematic diagram of the structure of another communication device provided in an embodiment of this application.

[0029] Figure 9 This is a schematic diagram of the structure of another communication device provided in the embodiments of this application.

[0030] Figure 10This is a schematic structural diagram of the communication device provided in the embodiments of this application. Detailed Implementation

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

[0032] Communication system architecture Figure 1 This is a system architecture example diagram of a wireless communication system 100 applicable to embodiments of this application. The wireless communication system 100 may include a network device 110 and a terminal device 120. The network device 110 may be a device that communicates with the terminal device 120. The network device 110 may provide communication coverage for a specific geographical area and may communicate with the terminal device 120 located within that coverage area.

[0033] Figure 1 An exemplary network device and multiple terminal devices are illustrated, such as terminal devices 120a to 120j in the figure. Optionally, the wireless communication system 100 may include multiple network devices, and each network device may include other numbers of terminal devices within its coverage area; this application embodiment does not limit this.

[0034] Optionally, the wireless communication system 100 may also include other network entities such as a network controller and a mobility management entity, which is not limited in this embodiment.

[0035] It should be understood that the technical solutions of the embodiments of this application can be applied to various communication systems, such as: 5th-generation (5G) systems or new radio (NR) systems, long-term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, advanced long-term evolution (LTE-A) systems, enhanced 5G (5G advanced) systems, etc. The technical solutions provided in this application can also be applied to future communication systems, such as 6th-generation (6G) mobile communication systems, satellite communication systems, and so on.

[0036] The terminal device in this application embodiment can also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user device. The terminal device in 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. The terminal device in the embodiments of this application may be a mobile phone, tablet computer, laptop computer, handheld computer, camera equipment, mobile internet device (MID), wearable device, virtual reality (VR) device, augmented reality (AR) device, wireless terminal in industrial control, wireless terminal in self-driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, etc. Optionally, the terminal device may be used to act as a base station. For example, the terminal device may act as a scheduling entity, providing sidelink signals between UEs in vehicle-to-everything (V2X) or device-to-device (D2D) connections. For example, cellular phones and cars communicate with each other using sidelink signals. Cellular phones and smart home devices can communicate without relaying communication signals through base stations.

[0037] The network device in this application embodiment can be a device for communicating with terminal devices. This network device can also be called an access network device or a radio access network device, such as a base station (BS). In this application embodiment, the network device can refer to a radio access network (RAN) node or a next-generation RAN (NG-RAN) node (or device) that connects user equipment to a wireless network. A base station can broadly encompass, or be replaced by, various names including: 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, or a combination thereof. A base station can also refer to a communication module, modem, or chip installed within the aforementioned equipment or apparatus. Base stations can also be mobile switching centers, devices that perform base station functions in D2D, V2X, and machine-to-machine (M2M) communications, network-side devices in 6G networks, and devices that perform base station functions in future communication systems. Base stations 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.

[0038] 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.

[0039] In some deployments, the network device in this application embodiment may refer to a CU or a DU, or the network device may include both a CU and a DU. The gNB may also include an AAU.

[0040] 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.

[0041] 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).

[0042] To facilitate understanding of the technical solutions of the embodiments of this application, the relevant technologies of the embodiments of this application are described below. The following relevant technologies are optional solutions and can be combined with the technical solutions of the embodiments of this application in any way, and they all fall within the protection scope of the embodiments of this application.

[0043] In communication systems based on relevant technologies (such as 5G NR systems), orthogonal frequency division multiplexing (OFDM) technology has achieved significant results in the field of wireless communication due to its advantages such as high spectrum utilization and strong resistance to multipath fading. However, when dealing with extreme communication scenarios in the future (such as ultra-high-speed mobile communication and terahertz band transmission), OFDM technology still faces a series of inherent limitations.

[0044] For example, OFDM technology is significantly sensitive to high-frequency phase noise, and in high-frequency transmission scenarios such as terahertz, it is easily affected by phase noise interference, leading to signal distortion. Furthermore, OFDM technology has a high PAPR (Power Amplifier Reduction Ratio), making it difficult for power amplifiers to operate in their efficient range and limiting system energy efficiency. Additionally, OFDM technology has stringent synchronization requirements, making deployment in complex channel environments challenging.

[0045] Therefore, the goal of future communication systems (such as 6G systems) is to seek one or more basic waveform schemes that can achieve higher spectral efficiency, stronger energy efficiency, greater robustness to hardware damage, and native support for new functions such as communication and sensing integration.

[0046] In the waveform design of future communication systems, relevant technologies mainly consider enhancements based on the OFDM framework. For example, orthogonal time-frequency space (OTFS) modulation significantly improves adaptability to high-speed mobile and high Doppler spread scenarios by mapping the signal to the "delay-Doppler" domain. Another example is windowed or filtered OFDM techniques, which effectively suppress out-of-band leakage through time-frequency domain filtering to support more flexible spectrum sharing. Furthermore, techniques such as differential OFDM enhance immunity to phase noise by transmitting relative phase information, making them suitable for high-frequency communications such as terahertz.

[0047] The above analysis shows that the waveforms of future communication systems may adopt a multi-mode fusion "waveform toolbox" architecture, enabling the system to dynamically select the optimal waveform based on specific application scenarios. For example, in high-speed mobile scenarios, the system can choose OTFS modulation and select a low-power single-carrier waveform for massive IoT terminals. Furthermore, artificial intelligence technology is being deeply integrated into waveform design to optimize waveform parameters in real time and even generate entirely new adaptive waveforms to cope with complex and ever-changing channel environments.

[0048] As the most fundamental signal framework of the physical layer, the waveform of future communication systems will have a profound impact on all aspects of the system. The following examples illustrate the research directions related to waveform design in future communication systems.

[0049] For example, waveforms (such as OFDM-based waveforms) and modulation techniques are a possible research direction. Specifically, the waveforms of future communication systems should be based on and evaluated using 5G NR waveforms and modulation schemes.

[0050] For example, frame structure design is a potential research direction. In frame structure design, compatibility with 5G NR needs to be considered to achieve efficient spectrum sharing and smooth evolution.

[0051] For example, channel coding is a possible research direction. In waveform research for future communication systems, low-density parity check codes (LDPC) and polar codes should be used as baseline schemes to study applicable extension schemes that meet the needs and characteristics of future communication systems, while balancing the performance and complexity of the communication system.

[0052] For example, channel bandwidth and parameter set configuration is a possible research direction. The minimum and maximum values ​​of the channel bandwidth should be clearly defined. Future communication systems should avoid using multiple parameter sets within the same frequency band / sub-band, achieving uniformity across a wide frequency range (e.g., approximately 7 GHz) to maximize synergistic gains in spectrum utilization and avoid efficiency losses caused by mixed parameter sets.

[0053] For example, physical layer control, scheduling, and hybrid automatic repeat request mechanisms; implementation schemes for MIMO technology; duplex technology; initial access procedures; and spectrum utilization and carrier aggregation technology are also research directions related to waveform design in future communication systems. Among them, the initial access procedure includes research on synchronization signals and grids, broadcast signals / channels, and physical random access channels; and / or research on initial access procedures, random access procedures, system information, and paging mechanisms.

[0054] Overall, the waveform design of future communication systems aims to build an extremely flexible and intelligently configurable physical layer foundation, while meeting the extreme performance requirements of diverse scenarios such as terahertz communication, integrated sensing, and ubiquitous interconnection. However, achieving a balance between performance and complexity, ensuring interoperability between different waveforms or modes, and building a mature and efficient industrial chain remain the core challenges in shaping the future technological trajectory.

[0055] Coverage capability is one of the key performance aspects that future communication system waveform design needs to enhance. With the continued expansion of fixed wireless access deployments globally, uplink needs to achieve higher throughput, making it particularly important to expand the coverage of multi-layer waveforms supporting higher-order modulation. In communication systems using related technologies (such as 5G NR systems), the uplink already supports both CP-OFDM and DFT-S-OFDM waveforms. In early solutions for these technologies, the system could select the waveform through configuration. Subsequent evolutions introduced dynamic waveform switching capabilities, enabling more refined waveform optimization.

[0056] The advantages of CP-OFDM waveforms include high spectral efficiency, flexible scheduling, and compatibility with MIMO. However, CP-OFDM waveforms have a relatively high PAPR (Power Appearance Ratio). PAPR is a key parameter directly affecting coverage capability; a higher PAPR indicates a larger ratio of instantaneous peak power to average power. To avoid signal distortion caused by high peak values, the power amplifier must reduce its input power, i.e., perform power back-off. A higher PAPR requires a larger amount of power back-off, which leads to a decrease in the power amplifier's conversion efficiency, a reduction in effective radiated power, and consequently a significant weakening of coverage capability.

[0057] DFT-S-OFDM waveforms have lower PAPR and better coverage. However, in related technologies, DFT-S-OFDM waveforms only support single-layer transmission and cannot utilize multiple antennas to achieve spatial diversity / multiplexing, thus limiting spectral efficiency.

[0058] In response to the comprehensive requirements of future communication systems for high capacity, wide coverage, and high energy efficiency, how to simultaneously support MIMO transmission and maintain low PAPR characteristics in a single waveform scheme has become an urgent technical problem to be solved in waveform design.

[0059] Because DFT-S-OFDM waveforms offer superior coverage, combining them with MIMO transmission can be considered to achieve spatial multiplexing gain and support multi-user operation. For example, one possible combination is for each antenna path in the MIMO transmission to independently complete the DFT-S-OFDM process, and then combine them. Figure 2 The following is a block diagram illustrating the implementation of the above method, combined with... Figure 2 The process of DFT-S-OFDM with multiple antennas is explained.

[0060] like Figure 2 As shown, for complex signals in the form of quadrature amplitude modulation (QAM) x ( n )= I ( n ) +jQ ( n The signal is split into at least two parallel data streams by the layer mapping module, achieving dimensional separation of the multi-stream signals. Each signal then independently enters the Discrete Fourier Transform (DFT) module, where the time-QAM symbols are converted into frequency-domain signals. The frequency-domain signals, after DFT processing, are then processed by the carrier mapping module, which allocates subcarrier resources. Next, the carrier-mapped signals undergo an inverse discrete fourier transform (IFFT) and a cyclic prefix (CP) is added, ultimately outputting an OFDM signal suitable for wireless transmission.

[0061] exist Figure 2 In the implementation shown, since the signal processing of each antenna path is completely independent, there is no signal superposition or interference between antenna paths, thus ensuring that the PAPR remains unchanged during transmission. In practical applications, to combat spatially selective fading, multi-layer signals can be pre-coded (e.g., weighted combining) to transmit the signal diversity across multiple antennas and obtain antenna gain.

[0062] The embodiments of this application do not limit the timing of precoding. For example, precoding can be performed after layer mapping is completed and before DFT, as shown in Figure 3(a). Alternatively, precoding can be performed after DFT is completed and before carrier mapping, as shown in Figure 3(b). Another example is that precoding can be performed after carrier mapping is completed and before IFFT and CP addition, as shown in Figure 3(c). Yet another example is that precoding can be performed after IFFT and CP addition, as shown in Figure 3(d).

[0063] However, in a DFT-S-OFDM system with added precoding, the PAPR of each antenna changes because the transmitted signal is no longer the original single-layer data, but a mixture of multiple DFT-S-OFDM outputs. For example, the PAPR increases during transmission in multi-layer combining. The following example illustrates the main reasons for the increased PAPR during multi-layer combining.

[0064] Taking a scenario with two antennas and two layers of transmission as an example, after the Layer 1 signal is modulated by DFT-S-OFDM (either before or after modulation) or after precoding and weighting the DFT-S-OFDM modulated signal, it is combined with the Layer 2 signal through the channel and antenna (or antenna port and power amplifier) ​​to complete the merging and transmission of the two layers of signals.

[0065] Assume the transmission sequence of Layer 1 signal is 'a' and the transmission sequence of Layer 2 signal is 'b'. For antenna 1, the precoding weighting factors configured for Layer 1 and Layer 2 signals are 'c' and 'd', respectively. The processing procedure is as follows: first, weight sequence a is weighted by weighting factor c, and sequence b is weighted by weighting factor d. Then, the two weighted signals are superimposed to obtain the final transmission signal ca+db of antenna 1, which is then transmitted by antenna 1. Considering that the power of each layer should be balanced, otherwise it will affect the transmission throughput, the amplitudes of factors c and d should be the same, while the phases of c and d can be different. The PAPR of the final transmitted signal can be calculated using formula (1).

[0066] Formula (1) In formula (1), This indicates the peak power of the final transmitted signal. This represents the average power of the final transmitted signal. Vector a corresponds to the vector composed of modulation symbols in layer 1, and vector b corresponds to the vector composed of modulation symbols in layer 2. Vectors a and b are statistically orthogonal, therefore ab H =0. Considering energy normalization, i.e., c=d= Furthermore, the formula (2) for calculating the average power is obtained.

[0067] Formula (2) As can be seen from formula (2), the average power of the final transmitted signal after merging is the same as the average power of the single-layer signal. Therefore, the PAPR of the final transmitted signal after merging is positively correlated with the peak power of the final transmitted signal. Different weighting values ​​of the two layers of signals will result in different peak powers, ultimately leading to different PAPR values. For example, there is a possibility that the transmission sequence a of layer 1 and the transmission sequence b of layer 2 are in phase. In this case, the two signals will undergo a coherent enhancement effect, resulting in the peak power of the weighted merged signal being significantly higher than the peak power of the single-layer signal. Based on the above positive correlation, the weighted merging of multi-layer signals will increase the PAPR index of the final transmitted signal.

[0068] Furthermore, if precoding is added before the DFT-S-OFDM system, the signal input to the DFT-S-OFDM system is a precoded and weighted signal due to the influence of precoding, and therefore does not have the constant mode characteristic of the original modulation signal.

[0069] To address the aforementioned issues and simultaneously support MIMO transmission while maintaining low PAPR characteristics, this application proposes a precoding method. This precoding method involves adjusting the phase relationship of signals from each layer to avoid excessively high instantaneous spikes when the signals from each layer are added together, which would cause PAPR to increase, thereby obtaining a better PAPR.

[0070] Figure 4 This is a schematic flowchart of a wireless communication method provided in an embodiment of this application. The following is a description of the method in conjunction with... Figure 4 The embodiments of this application will be described in detail below.

[0071] Figure 4 This description is from the perspective of the interaction between the first device and the second device. In the embodiments of this application, the first device is a transmitter, and the second device refers to a receiver. For example, the first device can be a terminal device, and the second device can be a network device. Alternatively, the first device can be a network device, and the second device can be a terminal device. In other words, the communication method provided in the embodiments of this application is applicable to both uplink signal transmission scenarios and downlink signal transmission requirements.

[0072] In step S410, the first device may send a first signal to the second device. The second device may receive the first signal sent by the first device.

[0073] The first signal mentioned in step S410 is a signal generated by the first device after precoding multiple transport layer signals. For example, in MIMO transmission, the first device can perform precoding matrix operations on multiple independent transport layer data streams transmitted in parallel, so that the multiple transport layer signals can be superimposed in the spatial dimension, and finally output the superimposed and merged first signal.

[0074] In some embodiments, the precoding described above includes phase adjustment (or phase rotation) of one or more of a plurality of transport layer signals. That is, the precoding operation can perform phase adjustment on only a single transport layer signal or on multiple transport layer signals simultaneously. The specific adjustment strategy can be flexibly set according to the actual channel environment and transmission rate requirements.

[0075] For example, if there are two transmission layers, the first device can perform phase adjustment on only one layer of the signal, so that the phase of the first layer signal is different from the phase of the second layer signal. Alternatively, the first device can also perform phase adjustment on both layers of signals separately, so that the phases of the two layers of signals form a differentiated distribution, avoiding the superposition of the two layers of signals in phase.

[0076] For example, if the number of transmission layers is extended to L (L>2), the first device can selectively perform phase adjustment on any L-1 transmission layer signals, so that the phases of the L transmission layer signals are different from each other. Alternatively, the first device can also perform phase adjustment on all L transmission layer signals, so that the phases of the L transmission layer signals form a differentiated distribution, thereby avoiding the superposition of the L transmission layer signals in phase.

[0077] The embodiments of this application do not limit the waveform type of the first signal. For example, the first signal can be a DFT-S-OFDM waveform signal, or the first signal can be a CP-OFDM waveform signal.

[0078] This application embodiment can change the phase offset of signals between different layers by adjusting the phase of one or more of the multiple transmission layer signals, so that the phases of the multiple transmission layer signals are distinguished during transmission, avoiding excessively high instantaneous power due to the superposition of the same phase, thereby effectively reducing the PAPR of the first signal after multi-layer merging.

[0079] In some embodiments, the phase adjustment mentioned above can be implemented based on a first matrix, which can be a diagonal matrix. For example, when the transport layer signal is represented in vector form, the first matrix can be a diagonal matrix with a size corresponding to the number of layers, where each element on the diagonal acts on a transport layer signal. Exemplarily, the dimension of the first matrix can be represented as N. t ×N s , where N t Number of transmitting antennas, N s This refers to the number of transmission layers (number of data streams). Taking a scenario with two antennas and two layers of transmission as an example, the first matrix can be a 2×2 matrix. Through the multiplication of diagonal matrices, each transmission layer signal can be independently multiplied by a coefficient, thereby achieving phase adjustment of signals from different layers.

[0080] In some embodiments, at least two diagonal elements in the first matrix are distinct. For example, when the first matrix is ​​a 2×2 diagonal matrix, phase differentiation of the corresponding two transmission layer signals can be achieved as long as the two diagonal elements differ. Alternatively, when the first matrix is ​​an L×L (L>2) diagonal matrix, all L diagonal elements can be distinct, thereby achieving phase differentiation of L transmission layer signals.

[0081] Taking a scenario with two antennas and two layers of transmission as an example, the first matrix can be used express.

[0082] or Among them, diagonal elements For complex weighting factors with specific phase adjustment characteristics, the diagonal element 1 indicates no weighting. Based on In the matrix precoding operation, the phase of the second-layer transport layer signal remains unchanged, while the phase of the first-layer transport layer signal changes. Phase adjustment is achieved under the action of [the system / mechanism]. By differentiating the diagonal elements of the first matrix, the phases of multiple transmission layer signals can be clearly distinguished, thereby avoiding the problem of instantaneous power surge caused by in-phase superposition during signal merging, and ultimately achieving an effective reduction in PAPR of the superimposed signal.

[0083] It should be noted that the modulus of the diagonal elements of the first matrix is ​​1. The diagonal elements of the first matrix only change the phase of the signal, not its amplitude. For example, the diagonal elements can be set to e. (jθ) The form is θ, where θ is the phase angle, ensuring that the signal in each transmission layer only undergoes phase rotation.

[0084] The previous section elaborated on the dimension definition of the first matrix, the differentiated design of the diagonal elements, and their role in reducing the PAPR of the signal. The following section explains how the elements in the first matrix are determined.

[0085] In some embodiments, the elements of the first matrix can be determined based on a first candidate set, which includes multiple candidate phase adjustment values. The first device can select phase adjustment values ​​from the first candidate set to determine the first matrix and ultimately transmit the first signal. Correspondingly, after detecting the first signal, the second device can determine the specific phase adjustment value used by the first device through blind detection.

[0086] This application does not limit the method of determining the first candidate set in the embodiments. Examples are given below.

[0087] For example, the first candidate set can be configured by a network device (such as a base station). After determining the first candidate set, the network device can send it to the terminal device via higher-layer signaling (such as radio resource control (RRC) signaling).

[0088] For example, the first candidate set can be determined by the terminal device. After determining the first candidate set, the terminal device can report the information of the first candidate set to the network device, thereby reaching an agreement with the network device.

[0089] For example, the first candidate set can be predefined by the protocol. In this case, both communicating parties obtain the first candidate set according to the protocol, without the need for additional signaling interaction.

[0090] In some embodiments, the first candidate set may be determined by a first parameter, which may include one or more of the following: phase interval; adjustable phase range; adjustable number of phases.

[0091] The phase interval in the first parameter defines the phase difference between two adjacent candidate phase adjustment values ​​in the first candidate set. For example, when a network device determines the first candidate set, it can configure the first candidate set as having equal phase intervals and send the specific parameters of this phase interval to the terminal device via higher-layer signaling. Similarly, when a terminal device determines the first candidate set, it can configure the first candidate set as having equal phase intervals and flexibly select the phase interval based on its own hardware processing capabilities, feeding this phase interval information back to the network device. Furthermore, the phase interval of the first candidate set (such as the equal interval attribute and the specific value of the phase interval) can be predefined through a protocol.

[0092] It should be understood that, due to the differences in phase adjustment for signals at different transmission layers, the times corresponding to the time-domain peaks of signals at each layer are also different. Therefore, the phase used for coherent superposition may differ at different times during signal merging. Based on this, the smaller the phase interval, the more densely available the selectable phase adjustment values, and the greater the flexibility in controlling the PAPR of the merged signal.

[0093] It should be noted that the embodiments of this application do not limit the phase values ​​of the first candidate set to be equally spaced; equal phase spacing is merely an exemplary implementation. From the perspective of signaling transmission efficiency, under the design of equal phase spacing, the network device only needs to send a small number of signaling instructions (e.g., only the number of phases and the phase spacing) to enable the terminal device to determine all candidate phase adjustment values ​​in the first candidate set, thereby effectively reducing the signaling interaction overhead of the system and improving resource utilization efficiency.

[0094] The adjustable phase range in the first parameter is used to define the range of phase adjustment values. For example, when the network device determines the first candidate set, it can determine the adjustable phase range itself and send the specific parameters of the adjustable phase range to the terminal device via higher-layer signaling. Alternatively, when the terminal device determines the first candidate set, it can determine the adjustable phase range based on its own hardware processing capabilities and feed back the specific parameters of the adjustable phase range to the network device. Furthermore, the adjustable phase range of the first candidate set can be predefined through a protocol.

[0095] For example, the adjustable phase range can be indicated by one or more of the following parameters: the start point of the phase change; the end point of the phase change; and the angle of the phase change. For instance, when a network device notifies a terminal device of the adjustable phase range, the network device can send any one or more of the start point, end point, and angle of the phase change via higher-layer signaling. Similarly, when a terminal device notifies a network device of the adjustable phase range, it can report any one or more of the start point, end point, and angle of the phase change. Furthermore, the protocol can predefine any one or more of the start point, end point, and angle of the phase change to define the adjustable phase range.

[0096] The adjustable number of phases in the first parameter is used to determine the total number of elements in the first candidate set. For example, when the network device determines the first candidate set, it can determine the adjustable number of phases itself and send this number to the terminal device via higher-layer signaling. Alternatively, when the terminal device determines the first candidate set, it can determine the adjustable number of phases based on its own hardware processing capabilities and feed it back to the network device. Furthermore, the adjustable number of phases in the first candidate set can be predefined through a protocol.

[0097] By selecting the first parameter, a first candidate set that adapts to different scenarios can be constructed, providing reliable data support for the subsequent determination of the first matrix elements.

[0098] In some embodiments, the phase interval mentioned above can be determined based on the number of transmission layers. That is, the value of the phase interval can be related to the number of transmission layers. For example, in multi-layer transmission scenarios, the fewer the number of transmission layers, the fewer points where the power amplifier at the transmitting end exceeds the linear operating range. In this case, a larger phase interval can be used to balance the control effect and system computational efficiency. However, when the number of transmission layers is greater, the number of points where the power amplifier exceeds the operating range increases. In this case, a finer phase interval needs to be configured to optimize the PAPR after the superposition of multiple signal layers by increasing the granularity of phase adjustment.

[0099] Various notification methods can be used to address the correlation between phase interval and transmission layer number.

[0100] For example, the notification can be in the form of a tuple of {layer number, phase interval}, binding the transmission layer number with the corresponding phase interval. This form supports the joint delivery of multiple sets of tuples. For example, by delivering specific configurations such as {1, 15} and {2, 30}, it can be explicitly indicated that the phase interval used by layer 1 is 15 degrees and the phase interval used by layer 2 is 30 degrees.

[0101] For example, the notification format can be a list of {phase interval 1, phase interval 2, ..., phase interval N}. This method only provides a sequence of phase interval values ​​and does not explicitly specify the transmission layer. Since the terminal device knows in advance the range of transmission layers it supports, it can map the phase intervals in the list to the transmission layers it supports one by one, according to a preset order of transmission layers from low to high or from high to low. As an example, if the terminal device supports 3 transmission layers and the preset order is to map the layers from low to high, when the network device sends the phase interval list {15, 10, 5}, the terminal device can map the 15-degree phase interval to the transmission of layer 1, the 10-degree phase interval to the transmission of layer 2, and the 5-degree phase interval to the transmission of layer 3.

[0102] In some embodiments, the phase interval may be associated with a first angle, where the phase interval at the first angle is smaller than the phase interval at other angles. For example, due to the influence of different signal characteristics (such as differences in modulation constellation diagrams or the signal being a real signal), phase adjustment is more sensitive to a specific angle. Based on this, a finer phase interval can be configured for this sensitive angle, thereby improving the accuracy of phase adjustment.

[0103] For example, the first angle includes one or more of the following: the angle of signal-to-noise ratio imbalance in the constellation diagram; the phase adjustment angle determined based on PAPR optimization.

[0104] For example, finer phase spacing can be configured for angles with unbalanced signal-to-noise ratios (SNR) in the constellation diagram. Taking binary phase shift keying (BPSK) modulation as an example, when the constellation diagram is at 45 degrees and 225 degrees, the signal amplitudes of the in-phase branch (I-path) and the quadrature branch (Q-path) are equal. Since the noise of the I-path and Q-path is independent, their SNRs are the same. However, when the constellation diagram is on the real or imaginary axis, the signal energy is concentrated in the I-path or Q-path. Consequently, the SNR of the I-path or Q-path is higher, while the SNR of the other branch is lower. For example, when the signal energy is concentrated in the I-path, the SNR of the I-path is higher, while the SNR of the Q-path is lower.

[0105] When the BPSK constellation points are located at 45 degrees and 225 degrees, the signal-to-noise ratio (SNR) of the I and Q paths exhibits a balanced distribution, resulting in superior signal detection performance and a relatively ideal system net gain. However, when the constellation points are close to the real or imaginary axis, the system net gain is relatively low. Based on this characteristic, finer phase intervals can be assigned to angles with unbalanced SNR in the constellation diagram (such as those near the real or imaginary axis). By adjusting the phase, the branch SNR distribution can be optimized.

[0106] For example, a finer phase interval can be configured for the phase adjustment angle determined based on PAPR optimization. When a phase rotation of a certain angle (such as 90 degrees) is performed on a signal in a transmission layer, the PAPR of the superimposed multi-layer signals may show a significant decreasing trend. Based on this characteristic, a finer phase interval can be set for this type of specific angle that can effectively suppress PAPR, thereby more accurately searching for and determining the optimal phase adjustment parameters within the value range around that angle.

[0107] In addition to phase adjustment of multiple transport layer signals, the precoding operation in this embodiment may also include weighted mapping of multiple transport layer signals. This weighted mapping can be implemented based on a second matrix, the values ​​of which are determined based on spatial channel state information. For example, weights can be assigned to multiple transport layer signals using the second matrix, and gain adaptation and channel matching in the spatial dimension can be achieved through weight adjustment.

[0108] Taking a scenario with two antennas and two-layer transmission as an example, the second matrix can be used express.

[0109] Each element in the second matrix All are complex weighting factors, whose amplitudes determine the power gain or attenuation of the signal, and whose phases correspond to the additional phase shift of the signal. The weighted mapping operation can be described as follows: assuming the two layers of signals to be transmitted form a vector... (in This is the first layer signal. (for the second layer signal), this signal vector and the second matrix By performing multiplication, the final output signals from the two transmitting antennas can be obtained. Through the second matrix, each layer of signal is distributed to multiple transmitting antennas with different weights, achieving spatial diversity or beamforming of the signal.

[0110] The second matrix used for weighted mapping can be combined with the first matrix used for phase adjustment mentioned above. This means that the precoding mechanism of this application embodiment can be understood as a multi-level precoding architecture. The first-level precoding is implemented by the second matrix, which precodes and adjusts the spatial channel, weighting and merging multiple parallel transmission layer signals and distributing them to multiple antenna ports, thus enabling the receiver to obtain a better equivalent channel. The second-level precoding is performed by the first matrix, which adjusts the phase relationship between the transmission layer signals. By differentially configuring the phases of multiple transmission layer signals, it avoids excessively high instantaneous power spikes during the superposition of multiple transmission layer signals, thereby effectively suppressing the PAPR of the merged signal (the first signal) and ensuring the operating efficiency of the transmitter power amplifier.

[0111] For example, the precoding matrix in this embodiment can be represented as the product of a second matrix and a first matrix. Taking a scenario with two antennas and two layers of transmission as an example, the precoding matrix in this embodiment can be used as follows: express.

[0112] or In some embodiments, the phase adjustment operation in precoding can be performed at a first time, and the weighting mapping operation in precoding can be performed at a second time. The first time and the second time can be different, or they can be the same. That is, the phase adjustment operation can be performed at a different time than the weighting mapping operation, or they can be performed simultaneously. The phase adjustment operation only needs to be performed after signal modulation is complete.

[0113] In some embodiments, when the first timing and the second timing are the same, phase adjustment and weighted mapping can be jointly implemented using a third matrix. That is, when phase adjustment and weighted mapping are performed simultaneously, they can be implemented using a single matrix (i.e., the third matrix). For example, the third matrix can be the product of the first and second matrices. For instance, in a two-antenna, two-layer transmission scenario, the third matrix can be represented as described above. In the form of.

[0114] For example, the first timing and / or the second timing includes any one of the following: before performing a DFT on multiple transport layer signals; after performing a DFT and before carrier mapping; after carrier mapping and before IFFT; after IFFT.

[0115] Figures 5(a) to 5(d) exemplarily illustrate the specific implementation locations of the first timing. For example, as shown in Figure 5(a), phase adjustment can be performed after layer mapping is completed and before DFT. As shown in Figure 5(b), phase adjustment can be performed after DFT is completed and before carrier mapping. As shown in Figure 5(c), phase adjustment can be performed after carrier mapping is completed and before IFFT and CP addition. As shown in Figure 5(d), phase adjustment can be performed after IFFT and CP addition.

[0116] It should be noted that Figures 5(a) to 5(d) only illustrate the timing selection of the phase adjustment operation and do not reflect the channel-oriented weighted mapping operation. In the actual precoding process, the weighted mapping operation is required.

[0117] In some embodiments, the first device may send phase adjustment-related information to the second device. After determining a first candidate set, the first device can select the final phase adjustment value from the first candidate set. After constructing the first matrix, the first device sends specific phase adjustment-related information (e.g., phase adjustment values ​​corresponding to each layer of signals) to the second device. For example, since the phase adjustment operation is directly related to the input data, the phase adjustment value cannot be pre-configured by the network device; instead, it needs to be determined by the terminal device based on the actual data to be transmitted and the terminal device notifies the network device of the phase adjustment-related information.

[0118] This application does not limit the method by which the first device sends phase adjustment-related information to the second device. The following is an exemplary description.

[0119] For example, the first device can send phase adjustment-related information to the second device by applying the same phase adjustment to the pilot signal as to the first signal. This method can be understood as an implicit notification method. When receiving the signal, the second device can infer the phase adjustment value used by the data signal by estimating the phase change of the pilot signal. This method does not require the first device to send additional signaling for explicit indication, thereby saving signaling interaction overhead in the system.

[0120] For example, the first device can send phase adjustment information to the second device via uplink control information (UCI). This method can be understood as an explicit notification method. For instance, the first device can directly send the phase adjustment values ​​corresponding to each layer of signals to the second device.

[0121] It should be noted that different phase adjustment values ​​correspond to different cell radio network temporary identifiers (C-RNTIs). When receiving signals, the second device can determine the corresponding phase adjustment value based on the detected C-RNTI by performing a verification check. This method is essentially a blind detection mechanism. Although it increases the signal processing complexity of the second device to some extent, it can significantly improve the reliability of phase adjustment information transmission, achieving the technical effect of trading computational complexity for system transmission robustness.

[0122] As mentioned above, in the precoding scheme of this application embodiment, it is not necessary to perform phase adjustment operations on all transport layer signals. Instead, phase modulation can be performed on only a portion of the transport layer signals according to actual needs. The method for determining the transport layer number that needs phase adjustment is described in detail below.

[0123] In some embodiments, the transport layer number for phase adjustment can be predefined by the protocol. In this case, both communicating parties obtain the transport layer number requiring phase adjustment according to the protocol, without additional signaling interaction. For example, the protocol can specify phase adjustment for transport layer 1, transport layer 3, and transport layer 4, and the first and second devices uniformly follow this rule to complete the phase adjustment of the corresponding signals during communication.

[0124] In some embodiments, the transport layer number for phase adjustment can be determined by the network device. In this case, the network device can select the transport layer number that needs phase adjustment based on the current channel quality, number of transport layers, PAPR requirements, etc., and send this information to the terminal device through higher-layer signaling (such as RRC signaling) to ensure that the terminal device accurately performs the phase adjustment operation for the target transport layer.

[0125] In some embodiments, the transport layer number for phase adjustment can be determined by the terminal device. In this case, the terminal device can autonomously determine the transport layer number for which phase adjustment needs to be performed based on its own hardware capabilities, the linear range of the power amplifier, the received channel feedback information, and other factors, and report the transport layer number to the network device through higher-layer signaling (such as RRC signaling) or UCI.

[0126] To facilitate understanding, the embodiments of this application are described in more detail below with reference to Embodiment 1. It should be noted that the examples below are merely to help those skilled in the art understand the embodiments of this application, and are not intended to limit the embodiments of this application to the specific numerical values ​​or scenarios illustrated. Those skilled in the art can obviously make various equivalent modifications or variations based on the given examples, and such modifications or variations also fall within the scope of the embodiments of this application.

[0127] Example 1 Example 1, taking the first device as the terminal device and the second device as the base station, details the method for determining the phase adjustment value and the signaling interaction mechanism.

[0128] In Example 1, the base station and terminal equipment can define a phase rotation candidate set (corresponding to the first candidate set mentioned above) through higher-layer signaling transmission or protocol predefinition. When determining the phase adjustment value, the terminal equipment selects from the phase rotation candidate set. During base station detection, blind detection is used to determine which value in the phase rotation candidate set is the phase adjustment value.

[0129] In some implementations, the base station can determine the phase candidate values ​​in the phase rotation candidate set. For example, the base station can configure the phase rotation candidate set to have equal phase intervals.

[0130] For example, when the phase rotation candidate set is equal phase interval, the phase interval can be predefined by the protocol, or the base station can notify the terminal device of the phase interval.

[0131] For example, when the phase rotation candidate set has equally spaced phases, an adjustable phase range can be predefined through the protocol, or the base station can notify the terminal device of the adjustable phase range. For instance, the starting point, ending point, and angle of the phase change can be predefined through the protocol or notified to the terminal device by the base station.

[0132] For example, when the phase rotation candidate set is equal phase intervals, the number of adjustable phases can be predefined by the protocol, or the base station can notify the terminal device of the number of adjustable phases.

[0133] In some implementations, the terminal device can determine the phase interval based on its own processing capabilities and then notify the base station of the phase interval information. For example, the terminal device can configure the phase rotation candidate set to have equal phase intervals.

[0134] For example, when the phase rotation candidate set is equal phase interval, the phase interval can be predefined by the protocol, or the terminal device can notify the base station of the phase interval.

[0135] For example, when the phase rotation candidate set has equally spaced phases, an adjustable phase range can be predefined through the protocol, or the terminal device can notify the base station of the adjustable phase range. For instance, the starting point, ending point, and angle of the phase change can be predefined through the protocol or notified to the base station by the terminal device.

[0136] For example, when the phase rotation candidate set is equal phase intervals, the number of adjustable phases can be predefined by the protocol, or the terminal device can notify the base station of the number of adjustable phases.

[0137] In some implementations, the phase spacing is related to the number of transmission layers. The more layers there are, the more points exceed the operating range, and the more points exceed the operating range, the finer the phase spacing needs to be.

[0138] In some implementations, the phase interval is associated with a specific angle (such as the first angle mentioned above). Different signal characteristics (such as different constellation diagrams or the signal being a real signal) can cause phase adjustment to be more sensitive to a particular angle. Therefore, a finer phase interval should be configured for a specific angle.

[0139] Because phase adjustment is related to the input data, it cannot be pre-configured by the base station; instead, the terminal device adjusts and determines the phase adjustment based on the input data. Therefore, the terminal device needs to notify the base station of the phase adjustment information in real time.

[0140] For example, the terminal device can adjust the phase via pilot notification, that is, the user rotates the phase of the pilot.

[0141] For example, the terminal device can adjust the phase via UCI notification.

[0142] Since different phase rotations correspond to different C-RNTIs, the base station verifies the C-RNTI during detection to determine the rotation value. This method is essentially blind detection, which is complex but has high reliability, thus trading complexity for system robustness.

[0143] In some implementations, the transport layer number requiring phase adjustment can be defined by the protocol. Alternatively, the base station can determine and notify the terminal device of the transport layer number requiring phase adjustment. Or, the terminal device can determine and notify the base station, for example, through higher-layer signaling or through UCI.

[0144] It should be understood that Embodiment 1 can be applied to the waveform design of cell edge terminal equipment. Under the premise of ensuring spectrum utilization, it can support the waveform transmission strategy and scheme of uplink multi-layer transmission, realize higher power uplink transmission, enhance the flexibility of uplink in scheduling and frequency resource selection, and provide more flexible waveform configuration.

[0145] The method embodiments of this application have been described in detail above. The apparatus embodiments of this application are described in detail below. 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 foregoing method embodiments.

[0146] Figure 6 This is a schematic diagram of the structure of a communication device 600 provided in this application. Figure 6The communication device 600 shown is a first device. The communication device 600 may include a first transmitting unit 610. The first transmitting unit 610 is used to transmit a first signal. The first signal is generated by the first device after precoding multiple transport layer signals, the precoding including phase adjustment of one or more of the multiple transport layer signals; the first signal is a signal based on a Discrete Fourier Transform Spread Spectrum Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) waveform.

[0147] In some implementations, the phase adjustment is based on a first matrix, which is a diagonal matrix in which at least two diagonal elements are distinct.

[0148] In some implementations, the diagonal elements of the first matrix have a modulus of 1.

[0149] In some implementations, the phase adjustment is based on a first matrix, the elements of which are determined based on a first candidate set, which includes multiple candidate phase adjustment values.

[0150] In some implementations, the first candidate set is provided by one of the following methods: network device determination; terminal device determination; protocol predefinition.

[0151] In some implementations, the first candidate set is determined by a first parameter, which includes one or more of the following: phase interval; adjustable phase range; adjustable number of phases.

[0152] In some implementations, the adjustable phase range is indicated by one or more of the following parameters: the starting point of the phase change; the ending point of the phase change; and the angle of the phase change.

[0153] In some implementations, the phase interval is determined based on the number of transmission layers.

[0154] In some implementations, the phase interval is associated with a first angle, where the phase interval at the first angle is smaller than the phase interval at other angles.

[0155] In some implementations, the first angle includes one or more of the following: the angle of signal-to-noise ratio imbalance in the constellation diagram; the phase adjustment angle determined based on peak-to-average power ratio optimization.

[0156] In some implementations, the precoding further includes weighted mapping of the plurality of transport layer signals, the weighted mapping being implemented based on a second matrix, the second matrix being determined based on spatial channel state information.

[0157] In some implementations, the phase adjustment is performed at a first time, and the weighted mapping is performed at a second time. The first time and the second time are different, or the first time and the second time are the same.

[0158] In some implementations, when the first timing is the same as the second timing, the phase adjustment and the weighted mapping are jointly implemented through a third matrix.

[0159] In some implementations, the first timing and / or the second timing includes any one of the following: before performing a Discrete Fourier Transform (DFT) on the plurality of transport layer signals; after the DFT and before carrier mapping; after the carrier mapping and before inverse Fourier Transform (IFFT); after the IFFT.

[0160] In some implementations, the communication device further includes a second transmitting unit for transmitting the phase adjustment-related information to the second device.

[0161] In some implementations, the phase adjustment related information is transmitted in one or more of the following ways: applying the same phase adjustment to the pilot signal as to the first signal; or transmitting the phase adjustment information via uplink control information.

[0162] In some implementations, the transport layer number for performing the phase adjustment is determined by one or more of the following methods: predefined by the protocol; determined by the network device; or determined by the terminal device.

[0163] In an optional embodiment, the first transmitting unit 610 may be a transceiver 1030. The communication device 600 may further include a processor 1010 and / or a memory 1020, specifically as follows: Figure 10 As shown.

[0164] Figure 7 This is a schematic diagram of the structure of a communication device 700 provided in this application. Figure 7 The communication device 700 shown is a second device. The communication device 700 may include a first receiving unit 710. The first receiving unit 710 is used to transmit a first signal. The first signal is generated by the first device after precoding multiple transport layer signals, the precoding including phase adjustment of one or more of the multiple transport layer signals; the first signal is a signal based on a Discrete Fourier Transform Spread Spectrum Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) waveform.

[0165] In some implementations, the phase adjustment is based on a first matrix, which is a diagonal matrix in which at least two diagonal elements are distinct.

[0166] In some implementations, the diagonal elements of the first matrix have a modulus of 1.

[0167] In some implementations, the phase adjustment is based on a first matrix, the elements of which are determined based on a first candidate set, which includes multiple candidate phase adjustment values.

[0168] In some implementations, the first candidate set is provided by one of the following methods: network device determination; terminal device determination; protocol predefinition.

[0169] In some implementations, the first candidate set is determined by a first parameter, which includes at least one of the following: phase interval; adjustable phase range; and adjustable number of phases.

[0170] In some implementations, the adjustable phase range is indicated by one or more of the following parameters: the starting point of the phase change; the ending point of the phase change; and the angle of the phase change.

[0171] In some implementations, the phase interval is determined based on the number of transmission layers.

[0172] In some implementations, the phase interval is associated with a first angle, where the phase interval at the first angle is smaller than the phase interval at other angles.

[0173] In some implementations, the first angle includes one or more of the following: the angle of signal-to-noise ratio imbalance in the constellation diagram; the phase adjustment angle determined based on peak-to-average power ratio optimization.

[0174] In some implementations, the precoding further includes weighted mapping of the plurality of transport layer signals, the weighted mapping being implemented based on a second matrix, the second matrix being determined based on spatial channel state information.

[0175] In some implementations, the phase adjustment is performed at a first time, and the weighted mapping is performed at a second time. The first time and the second time are different, or the first time and the second time are the same.

[0176] In some implementations, when the first timing is the same as the second timing, the phase adjustment and the weighted mapping are jointly implemented through a third matrix.

[0177] In some implementations, the first timing and / or the second timing includes any one of the following: before performing a Discrete Fourier Transform (DFT) on the plurality of transport layer signals; after the DFT and before carrier mapping; after the carrier mapping and before inverse Fourier Transform (IFFT); after the IFFT.

[0178] In some implementations, the communication device further includes a second receiving unit for receiving the phase adjustment-related information sent by the first device.

[0179] In some implementations, the method of receiving the phase adjustment related information includes one or more of the following: receiving a pilot signal that applies the same phase adjustment as the first signal; receiving the phase adjustment information transmitted via uplink control information.

[0180] In some implementations, the transport layer number for performing the phase adjustment is determined by one or more of the following methods: predefined by the protocol; determined by the network device; or determined by the terminal device.

[0181] In an optional embodiment, the first receiving unit 710 may be a transceiver 1030. The communication device 700 may further include a processor 1010 and / or a memory 1020, specifically as follows: Figure 10 As shown.

[0182] Figure 8 This is a schematic diagram of the structure of a communication device 800 provided in this application. Figure 8 The communication device 800 shown is a first device. The communication device 800 may include a third transmitting unit 810. The third transmitting unit 810 is used to transmit a first signal. The first signal is generated by the first device after precoding multiple transport layer signals, and the precoding includes phase adjustment of one or more of the multiple transport layer signals; the first signal is a signal based on a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform.

[0183] In an optional embodiment, the third transmitting unit 810 may be a transceiver 1030. The communication device 800 may further include a processor 1010 and / or a memory 1020, specifically as follows: Figure 10 As shown.

[0184] Figure 9 This is a schematic diagram of the structure of a communication device 900 provided in this application. Figure 9 The communication device 900 shown is a second device. The communication device 900 may include a third receiving unit 910. The third receiving unit 910 is used to receive a first signal. The first signal is generated by the first device after precoding multiple transport layer signals, the precoding including phase adjustment of one or more of the multiple transport layer signals; the first signal is a signal based on a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform.

[0185] In an optional embodiment, the third receiving unit 910 may be a transceiver 1030. The communication device 900 may also include a processor 1010 and / or a memory 1020, specifically as follows: Figure 10 As shown.

[0186] Figure 10 This is a schematic structural diagram of a communication apparatus according to an embodiment of this application. Figure 10 The dashed lines indicate that the unit or module is optional. The device 1000 can be used to implement the methods described in the above method embodiments. The device 1000 can be a chip, a terminal device, or a network device.

[0187] Apparatus 1000 may include one or more processors 1010. The processor 1010 may support apparatus 1000 in implementing the methods described in the preceding method embodiments. The processor 1010 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may 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. The general-purpose processor may be a microprocessor or any conventional processor.

[0188] The apparatus 1000 may further include one or more memories 1020. The memories 1020 store a program that can be executed by the processor 1010, causing the processor 1010 to perform the methods described in the preceding method embodiments. The memories 1020 may be independent of the processor 1010 or integrated within the processor 1010.

[0189] The device 1000 may also include a transceiver 1030. The processor 1010 can communicate with other devices or chips via the transceiver 1030. For example, the processor 1010 can send and receive data with other devices or chips via the transceiver 1030.

[0190] This application also provides a computer-readable storage medium for storing a program. This computer-readable storage medium can be applied to a terminal or network device provided in this application, and the program causes a computer to execute the methods performed by the terminal or network device in various embodiments of this application.

[0191] This application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to a terminal or network device provided in this application embodiment, and the program causes a computer to execute the methods performed by the terminal or network device in various embodiments of this application.

[0192] It should be understood that the terms "system" and "network" in this application can be used interchangeably. Furthermore, the terminology used in this application is only for explaining specific embodiments of the application and is not intended to limit the 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.

[0193] 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.

[0194] 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.

[0195] 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.

[0196] 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 terminal devices and network devices). This application does not limit the specific implementation method. For example, predefined can refer to what is defined in the protocol.

[0197] 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.

[0198] 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.

[0199] In the embodiments of this application, "comprising" can refer to direct inclusion or indirect inclusion. Optionally, "comprising" mentioned in the embodiments of this application can be replaced with "indicating" or "used to determine". For example, "A includes B" can be replaced with "A indicates B" or "A is used to determine B".

[0200] 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.

[0201] 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.

[0202] 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.

[0203] 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.

[0204] 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 may 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)).

[0205] 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 communication method, characterized in that, include: The first device sends a first signal to the second device; The first signal is generated by the first device after precoding multiple transport layer signals, and the precoding includes phase adjustment of one or more of the multiple transport layer signals; the first signal is a signal based on Discrete Fourier Transform Spread Spectrum Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) waveform.

2. The method according to claim 1, characterized in that, The phase adjustment is based on a first matrix, which is a diagonal matrix, in which at least two diagonal elements are different from each other.

3. The method according to claim 1 or 2, characterized in that, The diagonal elements of the first matrix have a modulus of 1.

4. The method according to claim 1 or 2, characterized in that, The phase adjustment is implemented based on a first matrix, the elements of which are determined based on a first candidate set, which includes multiple candidate phase adjustment values.

5. The method according to claim 4, characterized in that, The first candidate set is determined by a first parameter, which includes one or more of the following: Phase interval; Adjustable phase range; The number of adjustable phases.

6. The method according to claim 5, characterized in that, The adjustable phase range is indicated by one or more of the following parameters: The starting point of the phase change; The endpoint of the phase change; The angle of phase change.

7. The method according to claim 5, characterized in that, The phase interval is determined based on the number of transmission layers.

8. The method according to claim 5, characterized in that, The phase interval is associated with a first angle, and the phase interval at the first angle is smaller than the phase interval at other angles.

9. The method according to claim 8, characterized in that, The first angle includes one or more of the following: the angle of signal-to-noise ratio imbalance in the constellation diagram; the phase adjustment angle determined based on peak-to-average power ratio optimization.

10. The method according to claim 1 or 2, characterized in that, The precoding also includes weighted mapping of the plurality of transport layer signals, the weighted mapping being implemented based on a second matrix, the second matrix being determined based on spatial channel state information.

11. The method according to claim 10, characterized in that, The phase adjustment is performed at a first time, and the weighted mapping is performed at a second time. The first time and the second time are different, or the first time and the second time are the same.

12. The method according to claim 11, characterized in that, When the first timing and the second timing are the same, the phase adjustment and the weighted mapping are jointly implemented through a third matrix.

13. The method according to claim 1 or 2, characterized in that, The method further includes: The first device sends the phase adjustment-related information to the second device.

14. The method according to claim 13, characterized in that, The first device sends the phase adjustment-related information to the second device through one or more of the following methods: Apply the same phase adjustment as the first signal to the pilot signal; The phase adjustment information is sent via uplink control information.

15. A communication method, characterized in that, include: The second device receives the first signal sent by the first device; The first signal is generated by the first device after precoding multiple transport layer signals, and the precoding includes phase adjustment of one or more of the multiple transport layer signals; the first signal is a signal based on Discrete Fourier Transform Spread Spectrum Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) waveform.

16. The method according to claim 15, characterized in that, The phase adjustment is based on a first matrix, which is a diagonal matrix, in which at least two diagonal elements are different from each other.

17. The method according to claim 15 or 16, characterized in that, The diagonal elements of the first matrix have a modulus of 1.

18. The method according to claim 15 or 16, characterized in that, The phase adjustment is implemented based on a first matrix, the elements of which are determined based on a first candidate set, which includes multiple candidate phase adjustment values.

19. The method according to claim 18, characterized in that, The first candidate set is determined by a first parameter, which includes at least one of the following: Phase interval; Adjustable phase range; The number of adjustable phases.

20. The method according to claim 19, characterized in that, The adjustable phase range is indicated by one or more of the following parameters: The starting point of the phase change; The endpoint of the phase change; The angle of phase change.

21. The method according to claim 19, characterized in that, The phase interval is determined based on the number of transmission layers.

22. The method according to claim 19, characterized in that, The phase interval is associated with a first angle, and the phase interval at the first angle is smaller than the phase interval at other angles.

23. The method according to claim 22, characterized in that, The first angle includes one or more of the following: the angle of signal-to-noise ratio imbalance in the constellation diagram; the phase adjustment angle determined based on peak-to-average power ratio optimization.

24. The method according to claim 15 or 16, characterized in that, The precoding also includes weighted mapping of the plurality of transport layer signals, the weighted mapping being implemented based on a second matrix, the second matrix being determined based on spatial channel state information.

25. The method according to claim 24, characterized in that, The phase adjustment is performed at a first time, and the weighted mapping is performed at a second time. The first time and the second time are different, or the first time and the second time are the same.

26. The method according to claim 25, characterized in that, When the first timing and the second timing are the same, the phase adjustment and the weighted mapping are jointly implemented through a third matrix.

27. The method according to claim 15 or 16, characterized in that, The method further includes: The second device receives the phase adjustment-related information sent by the first device.

28. The method according to claim 27, characterized in that, The second device receives the phase adjustment-related information through one or more of the following methods: Receive a pilot signal that has been phase-adjusted with the same phase as the first signal; Receive the phase adjustment information sent via uplink control information.

29. A communication method, characterized in that, include: The first device sends a first signal to the second device; The first signal is generated by the first device after precoding multiple transport layer signals, and the precoding includes phase adjustment of one or more of the multiple transport layer signals; the first signal is a signal based on cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform.

30. A communication method, characterized in that, include: The second device receives the first signal sent by the first device; The first signal is generated by the first device after precoding multiple transport layer signals, and the precoding includes phase adjustment of one or more of the multiple transport layer signals; the first signal is a signal based on cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform.

31. A communication device, characterized in that, The communication device is a first device, and the communication device includes: The first transmitting unit is used to transmit a first signal to the second device; The first signal is generated by the first device after precoding multiple transport layer signals, and the precoding includes phase adjustment of one or more of the multiple transport layer signals; the first signal is a signal based on Discrete Fourier Transform Spread Spectrum Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) waveform.

32. The communication device according to claim 31, characterized in that, The phase adjustment is based on a first matrix, which is a diagonal matrix, in which at least two diagonal elements are different from each other.

33. The communication device according to claim 31 or 32, characterized in that, The diagonal elements of the first matrix have a modulus of 1.

34. The communication device according to claim 31 or 32, characterized in that, The phase adjustment is implemented based on a first matrix, the elements of which are determined based on a first candidate set, which includes multiple candidate phase adjustment values.

35. The communication device according to claim 34, characterized in that, The first candidate set is determined by a first parameter, which includes one or more of the following: Phase interval; Adjustable phase range; The number of adjustable phases.

36. The communication device according to claim 35, characterized in that, The adjustable phase range is indicated by one or more of the following parameters: The starting point of the phase change; The endpoint of the phase change; The angle of phase change.

37. The communication device according to claim 35, characterized in that, The phase interval is determined based on the number of transmission layers.

38. The communication device according to claim 35, characterized in that, The phase interval is associated with a first angle, and the phase interval at the first angle is smaller than the phase interval at other angles.

39. The communication device according to claim 38, characterized in that, The first angle includes one or more of the following: the angle of signal-to-noise ratio imbalance in the constellation diagram; the phase adjustment angle determined based on peak-to-average power ratio optimization.

40. The communication device according to claim 31 or 32, characterized in that, The precoding also includes weighted mapping of the plurality of transport layer signals, the weighted mapping being implemented based on a second matrix, the second matrix being determined based on spatial channel state information.

41. The communication device according to claim 40, characterized in that, The phase adjustment is performed at a first time, and the weighted mapping is performed at a second time. The first time and the second time are different, or the first time and the second time are the same.

42. The communication device according to claim 41, characterized in that, When the first timing and the second timing are the same, the phase adjustment and the weighted mapping are jointly implemented through a third matrix.

43. The communication device according to claim 31 or 32, characterized in that, The communication device also includes: The second transmitting unit is used to send the phase adjustment-related information to the second device.

44. The communication device according to claim 43, characterized in that, The method of transmitting the phase adjustment related information includes one or more of the following: Apply the same phase adjustment as the first signal to the pilot signal; The phase adjustment information is sent via uplink control information.

45. A communication device, characterized in that, The communication device is a second device, and the communication device includes: The first receiving unit is used to receive the first signal sent by the first device; The first signal is generated by the first device after precoding multiple transport layer signals, and the precoding includes phase adjustment of one or more of the multiple transport layer signals; the first signal is a signal based on Discrete Fourier Transform Spread Spectrum Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) waveform.

46. ​​The communication device according to claim 45, characterized in that, The phase adjustment is based on a first matrix, which is a diagonal matrix, in which at least two diagonal elements are different from each other.

47. The communication device according to claim 45 or 46, characterized in that, The diagonal elements of the first matrix have a modulus of 1.

48. The communication device according to claim 45 or 46, characterized in that, The phase adjustment is implemented based on a first matrix, the elements of which are determined based on a first candidate set, which includes multiple candidate phase adjustment values.

49. The communication device according to claim 48, characterized in that, The first candidate set is determined by a first parameter, which includes at least one of the following: Phase interval; Adjustable phase range; The number of adjustable phases.

50. The communication device according to claim 49, characterized in that, The adjustable phase range is indicated by one or more of the following parameters: The starting point of the phase change; The endpoint of the phase change; The angle of phase change.

51. The communication device according to claim 49, characterized in that, The phase interval is determined based on the number of transmission layers.

52. The communication device according to claim 49, characterized in that, The phase interval is associated with a first angle, and the phase interval at the first angle is smaller than the phase interval at other angles.

53. The communication device according to claim 52, characterized in that, The first angle includes one or more of the following: the angle of signal-to-noise ratio imbalance in the constellation diagram; the phase adjustment angle determined based on peak-to-average power ratio optimization.

54. The communication device according to claim 45 or 46, characterized in that, The precoding also includes weighted mapping of the plurality of transport layer signals, the weighted mapping being implemented based on a second matrix, the second matrix being determined based on spatial channel state information.

55. The communication device according to claim 54, characterized in that, The phase adjustment is performed at a first time, and the weighted mapping is performed at a second time. The first time and the second time are different, or the first time and the second time are the same.

56. The communication device according to claim 55, characterized in that, When the first timing and the second timing are the same, the phase adjustment and the weighted mapping are jointly implemented through a third matrix.

57. The communication device according to claim 45 or 46, characterized in that, The communication device also includes: The second receiving unit is used to receive the phase adjustment-related information sent by the first device.

58. The communication device according to claim 57, characterized in that, The method for receiving the phase adjustment-related information includes one or more of the following: Receive a pilot signal that has been phase-adjusted with the same phase as the first signal; Receive the phase adjustment information sent via uplink control information.

59. A communication device, characterized in that, The communication device is a first device, and the communication device includes: The third transmitting unit is used to transmit the first signal to the second device; The first signal is generated by the first device after precoding multiple transport layer signals, and the precoding includes phase adjustment of one or more of the multiple transport layer signals; the first signal is a signal based on cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform.

60. A communication device, characterized in that, The communication device is a second device, and the communication device includes: The third receiving unit is used to receive the first signal sent by the first device; The first signal is generated by the first device after precoding multiple transport layer signals, and the precoding includes phase adjustment of one or more of the multiple transport layer signals; the first signal is a signal based on cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform.

61. A communication device, characterized in that, The communication device is a first device, comprising: a transceiver, a memory, and a processor. 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 communication device performs the method as described in any one of claims 1-14 or 29.

62. A communication device, characterized in that, The communication device is a second device, comprising: 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 send signals, so that the communication device performs the method as described in any one of claims 15-28 or 30.

63. A communication device, characterized in that, Includes a processor for calling a program from memory to cause the apparatus to perform the method as described in any one of claims 1-30.

64. 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 as described in any one of claims 1-30.

65. A computer-readable storage medium, characterized in that, It contains a program that causes a computer to perform the method as described in any one of claims 1-30.

66. A computer program product, characterized in that, Includes a program that causes a computer to perform the method as described in any one of claims 1-30.

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