Signal sending method, signal receiving method, device and related equipment

Abstract

The application provides a signal sending method, a signal receiving method, a device and related equipment, wherein the signal sending method comprises obtaining time domain data corresponding to at least two same orthogonal frequency division multiplexing (OFDM) symbols, and the time domain data corresponding to each of the at least two same OFDM symbols is connected at the head and tail; and sending the time domain data corresponding to the at least two same OFDM symbols. In the embodiment of the application, by sending the at least two same OFDM symbols and connecting the time domain data corresponding to the at least two same OFDM symbols at the head and tail, no matter where the receiving window is positioned, complete data corresponding to the OFDM symbol can be received, thereby solving the problem that the sending device and the receiving device are not time-synchronized or the timing deviation exceeds the length of the cyclic prefix, resulting in that the receiving device cannot receive complete OFDM symbols sent by the sending device.

Description

Technical Field

[0001] This application relates to the field of wireless communication technology, and in particular to a signal transmission method, a signal reception method, an apparatus, and related equipment. Background Technology

[0002] Orthogonal Frequency Division Multiplexing (OFDM) is a high-speed transmission technology used in wireless environments and is widely applied in various digital transmissions and wireless communications. Since wireless frames in wireless communication systems strictly adhere to time definitions, timing synchronization is crucial for OFDM systems. However, timing synchronization errors or delay spread can cause inter-symbol interference (ISI) and inter-carrier interference (ICI) in OFDM systems.

[0003] In existing technologies, to mitigate the impact of timing synchronization deviations or delay spreads, guard periods (GP) and cyclic prefixes (CP) are added between OFDM symbols. Open-loop and closed-loop synchronization mechanisms are designed within the wireless system to dynamically adjust timing deviations, ensuring they remain within the cyclic prefix range and guaranteeing normal operation. However, the following problem exists: if the transmitting and receiving devices are not synchronized, or if the timing deviation exceeds the length of the cyclic prefix, the receiving device will be unable to receive the complete OFDM symbol transmitted by the transmitting device. Summary of the Invention

[0004] This application provides a signal transmission method, a signal reception method, an apparatus, and related equipment, which solves the problem that the receiving device cannot receive the complete OFDM symbol transmitted by the transmitting device because the transmitting device and the receiving device are not synchronized in time, or the timing deviation exceeds the length of the cyclic prefix.

[0005] To achieve the above objectives, embodiments of this application provide a signal transmission method, a signal reception method, an apparatus, and related equipment.

[0006] In a first aspect, embodiments of this application provide a signal transmission method, applied to a transmitting device, comprising:

[0007] Obtain time-domain data corresponding to at least two identical orthogonal frequency division multiplexing (OFDM) symbols, wherein the time-domain data corresponding to each of the at least two identical OFDM symbols are contiguous.

[0008] Transmit the time-domain data corresponding to the at least two identical OFDM symbols.

[0009] Secondly, embodiments of this application provide a signal receiving method, applied to a receiving device, comprising:

[0010] Receive at least a portion of time-domain data corresponding to at least two identical orthogonal frequency division multiplexing (OFDM) symbols, wherein the time-domain data corresponding to each of the at least two identical OFDM symbols are concatenated end-to-end.

[0011] Thirdly, embodiments of this application provide a signal transmitting device, including:

[0012] A first processor is configured to obtain time-domain data corresponding to at least two identical orthogonal frequency division multiplexing (OFDM) symbols, wherein the time-domain data corresponding to each of the at least two identical OFDM symbols are contiguous.

[0013] The first transceiver is used to transmit time-domain data corresponding to the at least two identical OFDM symbols.

[0014] Fourthly, embodiments of this application provide a signal receiving device, including:

[0015] The second transceiver is configured to receive at least a portion of the time-domain data corresponding to at least two identical orthogonal frequency division multiplexing (OFDM) symbols, wherein the time-domain data corresponding to each of the at least two identical OFDM symbols are concatenated end-to-end.

[0016] Fifthly, embodiments of the present invention also provide a communication device, including: a transceiver, a memory, a processor, and a program stored in the memory and executable on the processor; the processor is configured to read the program in the memory to implement the steps of the method described in the first aspect above; or, the steps of the method described in the second aspect above.

[0017] In a sixth aspect, embodiments of the present invention also provide a readable storage medium for storing a program, which, when executed by a processor, implements the steps of the method described in the first aspect above, or implements the steps of the method described in the second aspect above.

[0018] In this embodiment of the application, by sending at least two identical OFDM symbols and concatenating the time-domain data corresponding to the at least two identical OFDM symbols end to end, the data corresponding to the complete OFDM symbol can be received regardless of the location of the receiving window. This solves the problem that the receiving device cannot receive the complete OFDM symbol sent by the transmitting device due to the failure of the transmitting and receiving devices to synchronize in a timely manner or the timing deviation exceeding the length of the cyclic prefix. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings are described below. Obviously, the following drawings are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the listed drawings without creative effort.

[0020] Figure 1 This is a schematic diagram illustrating the various timing deviations that may occur in OFDM symbols.

[0021] Figure 2 This is a structural diagram of a network system to which the embodiments of this application can be applied;

[0022] Figure 3 This is a flowchart illustrating the signal transmission method provided in an embodiment of this application;

[0023] Figure 4 This is a schematic diagram of the time-domain data obtained after phase shifting and inverse Fourier transform of three identical OFDM symbols S-1, S-2, and S-3;

[0024] Figure 5 This is a schematic diagram of the time-domain data corresponding to three identical OFDM symbols S-1, S-2, and S-3, connected end to end.

[0025] Figure 6 This is a flowchart of the signal receiving method provided in the embodiments of this application;

[0026] Figure 7 This is a schematic diagram of OFDM symbols transmitted and received in an embodiment of this application;

[0027] Figure 8 This is a schematic diagram of the structure of the signal transmitting device provided in the embodiments of this application;

[0028] Figure 9 This is a schematic diagram of the structure of the signal receiving device provided in the embodiments of this application;

[0029] Figure 10 This is a schematic diagram of the structure of the communication device provided in the embodiments of this application. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0031] The following is a brief introduction to the background of this application. In the prior art, Orthogonal Frequency Division Multiplexing (OFDM) technology is widely used in various digital transmission and wireless communications, such as Wi-Fi, 4G, and 5G systems, all of which use OFDM as the basis for signal transmission. In wireless communication systems, radio frames strictly adhere to time definitions, making timing synchronization crucial. For OFDM systems, timing synchronization deviations or delay spreads can cause inter-symbol interference (ISI) and inter-carrier interference (ICI). To minimize the impact of timing synchronization deviations or delay spreads, a guard period (GP) can be added between OFDM symbols.

[0032] Based on the properties of the Fast Fourier Transform (FFT), the cyclic convolution characteristic of the FFT allows the signal to be viewed as a circle. Applying an FFT window at any point within this circle will capture a complete signal; the only difference is the introduction of a phase difference between the subcarriers. However, this does not affect the integration. Regardless of the start or end points, as long as there is a complete circle and a complete OFDM symbol, adding a cyclic prefix (CP) ensures that, as long as the timing deviation delay is within the CP range, the signal received by the receiving device will still be a complete OFDM symbol within the FFT window, allowing for the reconstruction of the complete signal.

[0033] Please see Figure 1 , Figure 1 This is a schematic diagram illustrating various timing deviations that can occur in OFDM symbols. The position of the timing window is closely related to the accuracy of OFDM symbol demodulation. For example... Figure 1 As shown, when timing is ahead but within the CP range, the receiving window contains a portion of the CP and a portion of the valid data. Due to its periodicity, it still constitutes a complete OFDM symbol, only with a time shift in the time domain and a phase difference in the frequency domain. This does not cause inter-OFDM symbol interference, and the data can still be fully recovered. When timing is delayed or ahead and exceeds the CP range, the receiving window contains a portion of the valid data of this symbol and data from other OFDM symbols. This will cause inter-OFDM symbol interference, affecting FFT calculation and OFDM symbol demodulation. As inter-symbol interference increases, OFDM symbols may become completely undemodulable.

[0034] Timing synchronization is essential in wireless systems. To this end, 3G, 4G, and 5G systems have all designed open-loop and closed-loop synchronization mechanisms to dynamically adjust timing deviations so that they remain within the CP range, thereby maintaining the normal operation of the entire system.

[0035] Before initial synchronization is achieved, open-loop synchronization generally relies on the Physical Random Access Channel (PRACH). Unlike other physical channels, the PRACH channel has a special channel structure, a longer CP (Concurrent Access Length), and can tolerate greater latency. The appropriate PRACH format is selected according to the coverage area of ​​the cell, and the appropriate CP length ensures that possible timing deviations within the target coverage area of ​​the cell are within its CP range.

[0036] In addition, in 5G, a special reference signal RIM-RS is designed for purposes such as detecting remote interference. It also has a special channel structure and a longer CP to meet the needs of receiving and detecting the reference signal under uncertain time delay conditions between the transmitting and receiving parties.

[0037] However, both PRACH and RIM-RS have limited tolerance for latency due to the CP length constraint, and their design only meets the requirements of the specific application scenario. In scenarios where timing deviations are uncertain or exist between the transmitter and receiver and cannot be adjusted, and where the deviation exceeds the CP length, the signal will not be received correctly.

[0038] Therefore, to address the problem of the receiving device being unable to receive the complete OFDM symbol sent by the transmitting device due to a lack of timing synchronization between the transmitting and receiving devices, or a timing deviation exceeding the length of the cyclic prefix, embodiments of this application provide a signal transmission method, a signal reception method, an apparatus, and related equipment. By transmitting at least two identical OFDM symbols, and ensuring that the time-domain data corresponding to these at least two identical OFDM symbols are contiguous, the receiving device can receive the data corresponding to the complete OFDM symbol regardless of the location of the receiving window. This solves the problem of the receiving device being unable to receive the complete OFDM symbol sent by the transmitting device due to a lack of timing synchronization between the transmitting and receiving devices, or a timing deviation exceeding the length of the cyclic prefix. Details are as follows.

[0039] The structural diagram of the network system to which this application embodiment can be applied is shown below. Figure 2 As shown, it includes a transmitting device 11 and a receiving device 12, which can communicate with each other.

[0040] The transmitting device 11 can be a terminal. In practical applications, the terminal can be a mobile phone, tablet computer, laptop computer, personal digital assistant (PDA), mobile internet device (MID), wearable device, or in-vehicle device, etc. The receiving device 12 can be a base station, access point, or other network element, etc.

[0041] The signal transmission and signal reception methods provided in the embodiments of this application are described below. It should be noted that the following description uses 5G as an example only, but the methods provided in the embodiments of this application are applicable to, but not limited to, 5G, and can also be applied to OFDM systems such as 4G.

[0042] See Figure 3 , Figure 3 This is one of the flowcharts illustrating the signal transmission method provided in the embodiments of this application. Figure 3 The method shown can be performed by the transmitting device 11.

[0043] like Figure 3 As shown, the signal transmission method may include the following steps:

[0044] Step 201: Obtain time-domain data corresponding to at least two identical orthogonal frequency division multiplexing (OFDM) symbols, wherein the time-domain data corresponding to each of the at least two identical OFDM symbols are concatenated end-to-end.

[0045] It's important to note that Orthogonal Frequency Division Multiplexing (OFDM) is a type of multi-carrier modulation. The main idea of ​​OFDM is to divide the channel into several orthogonal sub-channels, converting high-speed data signals into parallel low-speed sub-data streams, which are then modulated onto each sub-channel for transmission. OFDM enables parallel transmission of high-speed serial data, exhibiting good resistance to multipath fading and supporting multi-user access. From a frequency domain perspective, an OFDM symbol can be understood as discrete samples obtained through Fourier transform. For example, using 128 subcarriers, the 128 discrete samples obtained after Fourier transform constitute an OFDM symbol, where each sample contains information from all subcarriers. From a time domain perspective, an OFDM symbol can be understood as a time-continuous value obtained by inverse Fourier transform of the discrete samples. The length of an OFDM symbol can be understood as the duration of each OFDM symbol from a time domain perspective.

[0046] Identical OFDM symbols carry exactly the same information. In practice, frequency domain data corresponding to at least two identical OFDM signals can be obtained first. Then, phase shifting and inverse Fourier transform are performed on the frequency domain data to obtain time domain data corresponding to at least two identical OFDM signals. Phase shifting the frequency domain data ensures that the time domain data obtained after the inverse Fourier transform is concatenated, allowing the receiving device to extract complete OFDM symbols at any position within its receiving window.

[0047] For ease of understanding, let's take three identical OFDM symbols as an example, combined with... Figure 4 and Figure 5 By concatenating time-domain data end to end, the receiving window of the receiving device can extract the complete OFDM symbol for description at any position.

[0048] Please see Figure 4 , Figure 4 A schematic diagram of time-domain data obtained by phase shifting and inverse Fourier transform of at least three identical OFDM symbols S-1, S-2, S-3...

[0049] Figure 4 In this approach, OFDM symbols are divided into multiple squares of length Ncp, with different fill patterns distinguishing different squares. As mentioned earlier, OFDM symbols can be understood from a time-domain perspective as time-continuous values ​​obtained by the inverse Fourier transform of discrete samples. Here, squares of length Ncp represent the time-continuous values ​​of OFDM symbols. Figure 5 As shown, the OFDM symbols S-1, S-2, S-3... obtained after phase shifting and inverse Fourier transform are connected end-to-end to form multiple consecutive OFDM symbols of length Nu. Each Nu-length square corresponds to the exact same OFDM symbol's time-domain data. Therefore, a receiving window of length Nu can receive the complete OFDM symbol at any position within the length range (i.e., time range) of at least three symbols S-1, S-2, S-3...

[0050] Step 202: Send the time-domain data corresponding to the at least two identical OFDM symbols.

[0051] In practice, you can send time-domain data corresponding to at least two identical OFDM symbols, or you can send time-domain data corresponding to at least two identical OFDM symbols and time-domain data corresponding to different OFDM symbols at the same time.

[0052] Sending the time-domain data corresponding to the at least two identical OFDM symbols can also be understood as sending an OFDM symbol after repeating it at least twice. The specific number of repetitions can be set according to the actual situation, such as the requirements and the total length of the uplink slot in the frame structure.

[0053] As mentioned earlier, concatenating the time-domain data corresponding to at least two identical OFDM symbols allows the receiving device to extract the complete OFDM symbol at any position within its receiving window. Therefore, repeatedly transmitted OFDM symbols do not require strict timing synchronization between the transmitting and receiving devices, and the repeated OFDM symbols can still be received completely by the receiving device.

[0054] The application of the method provided in this application includes, but is not limited to, sending calibration signals or reference signals with long timing deviations, and measuring the duration of timing deviations.

[0055] In this embodiment of the application, by sending at least two identical OFDM symbols and concatenating the time-domain data corresponding to the at least two identical OFDM symbols end to end, the data corresponding to the complete OFDM symbol can be received regardless of the location of the receiving window. This solves the problem that the receiving device cannot receive the complete OFDM symbol sent by the transmitting device due to the failure of the transmitting and receiving devices to synchronize in a timely manner or the timing deviation exceeding the length of the cyclic prefix.

[0056] Optionally, step 201 includes:

[0057] Step 2011: Determine the frequency domain data corresponding to each symbol in the at least two identical OFDM symbols, and the frequency domain phase difference corresponding to each symbol in the at least two identical OFDM symbols.

[0058] In specific implementation, let This refers to frequency domain data repeatedly transmitted over S OFDM symbols, where S is the number of OFDM symbols being repeatedly transmitted. S is a positive integer, such as 5. s is the OFDM symbol number, 0 ≤ s ≤ S-1, l ∈ {0, 1, ..., S-1}. μ is the subcarrier spacing configuration, Δf = 2 μ • 15 [kHz], k is the subcarrier index relative to a reference, and p is the antenna port number.

[0059] Typically, this is achieved using an inverse fast Fourier transform (iFFT) or a Fourier transform (FFT) with a certain number of points, f s Sampling rate, That is, duration The sampling rate f corresponding to the CP s The number of sample points is given below.

[0060]

[0061]

[0062] The size of the resource grid. The number of subcarriers per resource block. Cyclic prefix length

[0063] From the above equation, it can be seen that a time shift in the time domain is equivalent to a phase shift in the frequency domain. The frequency domain phase difference, denoted by s, is: 0≤s≤S-1 means that the frequency domain phase difference of each symbol is a constant related to the symbol number s.

[0064] Step 2012: Multiply the frequency domain data and frequency domain phase difference of the same symbol in the at least two identical OFDM symbols to obtain the first frequency domain data corresponding to each symbol in the at least two identical OFDM symbols.

[0065] In practice, the frequency domain data and frequency domain phase difference of the same symbol in at least two identical OFDM symbols are multiplied to obtain the first frequency domain data.

[0066]

[0067] Step 2013: Based on the first frequency domain data, obtain the time domain data corresponding to the at least two identical OFDM symbols.

[0068] Example 1: In practical implementation, the inverse Fourier transform can be performed on the first frequency domain data corresponding to each symbol to obtain the time domain data corresponding to at least two identical OFDM symbols. The formula for the inverse Fourier transform is common knowledge and will not be elaborated here.

[0069] Example 2: In a specific implementation, the first frequency domain data corresponding to each symbol can also be subjected to an inverse Fourier transform using the inverse Fourier transform formula described in Example 1 to obtain at least two first time domain data. A cyclic prefix is ​​then added to these at least two first time domain data to obtain time domain data corresponding to at least two identical OFDM symbols. The cyclic prefix is ​​constructed by copying the signal from the tail of the OFDM symbol to the head.

[0070] Furthermore, this application also provides a formula that can be used to directly process the frequency domain data corresponding to each OFDM symbol to obtain time domain data corresponding to at least two identical OFDM symbols. Given that the frequency domain data is the same, the time domain data obtained by this formula is identical to the time domain data obtained in Example 2 through phase shifting, inverse Fourier transform, and adding a cyclic prefix. The formula is as follows:

[0071]

[0072] In the formula, Δf is the subcarrier spacing, and T c The basic time unit for NR.

[0073] It should be noted that the method provided in Example 1 is applicable to Scenario 1 below. Scenario 1 involves transmitting at least two different OFDM symbols, each of which is repeated at least twice. For example, transmitting two different OFDM symbols S1 and S2, where S1 is repeated twice and S2 is repeated three times. The time-domain data corresponding to at least two identical OFDM symbols (i.e., S1 repeated twice and S2 repeated three times) are concatenated, allowing the receiving device to extract the complete OFDM symbol at any position within its receiving window. Therefore, the repeatedly transmitted OFDM symbol does not require strict timing synchronization between the transmitting and receiving devices, and the repeated OFDM symbol can be completely received by the receiving device.

[0074] The method provided in this application can transmit time-domain data corresponding to at least two identical OFDM symbols, with the time-domain data corresponding to the at least two identical OFDM symbols contiguous. Alternatively, it can transmit time-domain data corresponding to at least two identical OFDM symbols (with the time-domain data corresponding to the at least two identical OFDM symbols contiguous) and time-domain data corresponding to different OFDM symbols simultaneously. For time-domain data corresponding to at least two identical OFDM symbols, as mentioned above, the complete data corresponding to the OFDM symbol can be received regardless of the receiving window's location. For time-domain data corresponding to different OFDM symbols, a cyclic prefix can be added to ensure that the complete data corresponding to the OFDM symbol is received when the receiving window is located within the cyclic prefix range.

[0075] Therefore, by adding a cyclic prefix to at least two first time-domain data, the complete data corresponding to the OFDM symbol can be received even when the transmitted signal includes time-domain data corresponding to different OFDM symbols, and the receiving window is positioned within the range of the cyclic prefix.

[0076] It should be noted that low-PHY functions, such as physical layer FFT / iFFT and cyclic prefix removal / cyclic prefix addition, have simple computational logic but high computational complexity. They are typically implemented using relatively fixed devices like FPGAs; and this part is usually separated from the high-PHY. The above implementation uses multiplication of the data in the frequency domain by different phase differences to concatenate the time-domain data. The low-PHY part does not require any modification; it is implemented by modifying the more flexible high-PHY part.

[0077] See Figure 6 , Figure 6 This is a flowchart of a signal receiving method provided in an embodiment of this application. The signal receiving method of this embodiment can be executed by the receiving device 12.

[0078] like Figure 6 As shown, the signal receiving method may include the following steps:

[0079] Step 301: Receive at least a portion of the time-domain data corresponding to at least two identical orthogonal frequency division multiplexing (OFDM) symbols, wherein the time-domain data corresponding to each of the at least two identical OFDM symbols are concatenated end-to-end.

[0080] After receiving at least a portion of the time-domain data corresponding to at least two identical orthogonal frequency division multiplexing (OFDM) symbols transmitted by the receiving device 11, the receiving device 12 can process the at least portion of the time-domain data to obtain at least one complete OFDM symbol.

[0081] It should be noted that the receiving device 12 may not be able to completely receive at least two identical OFDM symbols transmitted by the transmitting device 11. That is, due to time delay, the receiving device 12 may not be able to completely receive the time domain data corresponding to at least two identical OFDM symbols, but the receiving device 12 can recover at least one complete OFDM symbol based on the time domain data it receives.

[0082] This embodiment serves as a comparison with Figure 3 For the implementation methods of the receiving devices corresponding to the method embodiments, please refer to [link / reference]. Figure 3 The relevant descriptions in the method embodiments can achieve the same beneficial effects. To avoid repetition, they will not be repeated here.

[0083] Optionally, the time-domain data corresponding to the at least two identical OFDM symbols is received by merging.

[0084] As mentioned earlier, receiving device 12 may not be able to completely receive at least two identical OFDM symbols transmitted by transmitting device 11. When receiving device 12 can receive at least two identical OFDM symbols, it merges the time-domain data corresponding to the at least two identical OFDM symbols transmitted by transmitting device 11.

[0085] In this embodiment of the application, the receiving gain can be improved by receiving time-domain data corresponding to at least two identical orthogonal frequency division multiplexing (OFDM) symbols.

[0086] Depend on Figure 3 As can be seen from the relevant descriptions in the method embodiments, there are at least three ways to generate the time-domain data corresponding to the at least two identical OFDM symbols. The first way is to obtain the data by performing an inverse Fourier transform on the frequency-domain data corresponding to the at least two identical OFDM symbols. The second way is to obtain the data by performing a phase shift, an inverse Fourier transform, and adding a cyclic prefix on the frequency-domain data corresponding to the at least two identical OFDM symbols. The third way is to directly obtain the time-domain data based on the formula.

[0087] After receiving time-domain data obtained by different generation methods, the receiving device 12 processes the data in different ways, as follows.

[0088] After receiving time-domain data corresponding to at least two identical OFDM symbols generated in the first manner, the method further includes, after step 301:

[0089] Perform a Fourier transform on the time-domain data corresponding to the at least two identical OFDM symbols to obtain at least two first frequency-domain data.

[0090] Phase difference compensation is performed on the at least two first frequency domain data to obtain frequency domain data corresponding to each symbol in the at least two identical OFDM symbols.

[0091] After receiving time-domain data corresponding to at least two identical OFDM symbols generated by the second and third methods, the method further includes, after step 301:

[0092] Remove the cyclic prefix from the time-domain data corresponding to the at least two identical OFDM symbols to obtain the first time-domain data;

[0093] Perform a Fourier transform on the first time-domain data to obtain at least two first frequency-domain data.

[0094] Phase difference compensation is performed on the at least two first frequency domain data to obtain frequency domain data corresponding to each symbol in the at least two identical OFDM symbols.

[0095] In practice, after removing the cyclic prefix of OFDM symbols from the contiguous time-domain data using the conventional cyclic prefix removal method, the time-domain data of each symbol are sequentially delayed by the length of the cyclic prefix (CP). Therefore, the Fourier transform yields the frequency-domain data. With phase difference At this point, by compensating for this phase difference, the received side frequency domain data is obtained.

[0096]

[0097] It should be noted that the method provided in this application embodiment applies to the same channel structure as the physical shared channel, and the time-frequency transformation is implemented in the same way, without needing to be implemented separately for different physical channels.

[0098] For ease of understanding, the method provided in the embodiments of this application will be described below with an example.

[0099] See Figure 7 In existing technologies, there is a timing deviation (TimeOffset) between the signal transmitter and receiver. If the TimeOffset is greater than the duration of the cyclic prefix (CP), the receiver cannot completely receive the time-domain data of each OFDM symbol, resulting in inter-symbol interference and thus failing to receive correctly.

[0100] The method provided in the embodiments of this application is used for signal transmission and reception:

[0101] The signal transmitter sends OFDM symbols N and N+1, where symbols N and N+1 are time-domain data corresponding to two identical OFDM symbols obtained using the method of this application, and the time-domain data corresponding to the two identical OFDM symbols are concatenated end to end.

[0102] The signal receiver can receive the complete time-domain data of OFDM symbol N+1. While the corresponding frequency-domain data exhibits a phase shift, the data can still be demodulated normally. Furthermore, the timing deviation can be calculated from the channel estimation results.

[0103] See Figure 8 , Figure 8 This is a schematic diagram of the structure of the signal transmitting device provided in the embodiments of this application, as shown below. Figure 8 As shown, the signal transmitting device 400 includes:

[0104] The first processor 401 is configured to obtain time-domain data corresponding to at least two identical orthogonal frequency division multiplexing (OFDM) symbols, wherein the time-domain data corresponding to each of the at least two identical OFDM symbols are contiguous.

[0105] The first transceiver 402 is used to transmit time-domain data corresponding to the at least two identical OFDM symbols.

[0106] Optionally, the first processor 401 is further configured to determine the frequency domain data corresponding to each symbol in the at least two identical OFDM symbols, and the frequency domain phase difference corresponding to each symbol in the at least two identical OFDM symbols;

[0107] Multiply the frequency domain data and frequency domain phase difference of the same symbol in the at least two identical OFDM symbols to obtain the first frequency domain data corresponding to each symbol in the at least two identical OFDM symbols;

[0108] Based on the first frequency domain data, the time domain data corresponding to the at least two identical OFDM symbols are obtained.

[0109] Optionally, the first processor 401 is further configured to perform an inverse Fourier transform on the first frequency domain data corresponding to each symbol to obtain time domain data corresponding to at least two identical OFDM symbols;

[0110] Alternatively, perform an inverse Fourier transform on the first frequency domain data corresponding to each symbol to obtain at least two first time domain data; add a cyclic prefix to the at least two first time domain data to obtain time domain data corresponding to at least two identical OFDM symbols.

[0111] The signal transmitting device 400 can realize the functions described in the embodiments of the present invention. Figure 3 The various processes in the method embodiments, and the ways to achieve the same beneficial effects, will not be repeated here to avoid repetition.

[0112] See Figure 9 , Figure 9 This is a schematic diagram of the structure of the signal receiving device provided in the embodiments of this application, as shown below. Figure 9 As shown, the signal receiving device 500 includes:

[0113] The second transceiver 501 is used to receive at least a portion of the time-domain data corresponding to at least two identical orthogonal frequency division multiplexing (OFDM) symbols, wherein the time-domain data corresponding to each of the at least two identical OFDM symbols are concatenated end-to-end.

[0114] Optionally, the second transceiver 501 is used to combine the time-domain data corresponding to the at least two identical OFDM symbols.

[0115] Optionally, the time-domain data corresponding to the at least two identical OFDM symbols is obtained by sequentially performing phase shift and inverse Fourier transform on the frequency-domain data corresponding to the at least two identical OFDM symbols.

[0116] Optionally, the signal receiving device 500 further includes a second processor, the second processor being used for:

[0117] Perform a Fourier transform on the time-domain data corresponding to the at least two identical OFDM symbols to obtain at least two first frequency-domain data.

[0118] Phase difference compensation is performed on the at least two first frequency domain data to obtain frequency domain data corresponding to each symbol in the at least two identical OFDM symbols.

[0119] Optionally, the time-domain data corresponding to the at least two identical OFDM symbols is obtained by sequentially performing phase shift, inverse Fourier transform, and adding a cyclic prefix on the frequency-domain data corresponding to the at least two identical OFDM symbols.

[0120] Optionally, the signal receiving device 500 further includes a second processor, which is configured to: remove the cyclic prefix of the time-domain data corresponding to the at least two identical OFDM symbols to obtain the first time-domain data;

[0121] Perform a Fourier transform on the first time-domain data to obtain at least two first frequency-domain data.

[0122] Phase difference compensation is performed on the at least two first frequency domain data to obtain frequency domain data corresponding to each symbol in the at least two identical OFDM symbols.

[0123] The signal receiving device 500 can implement the embodiments of the present invention. Figure 8 The various processes in the method embodiments, and the ways to achieve the same beneficial effects, will not be repeated here to avoid repetition.

[0124] This invention also provides a communication device. Please refer to [link to relevant documentation]. Figure 10 The communication device may include a processor 601, a memory 602, and a program 6021 stored in the memory 602 and capable of running on the processor 601.

[0125] When the communication device is a transmitting device, program 6021 can be implemented when executed by processor 601. Figure 3 Any steps in the corresponding method embodiments and the achievement of the same beneficial effects will not be repeated here.

[0126] When the communication device is a receiving device, program 6021 can be implemented when executed by processor 601. Figure 6 Any steps in the corresponding method embodiments and the achievement of the same beneficial effects will not be repeated here.

[0127] Those skilled in the art will understand that all or part of the steps of the methods described in the above embodiments can be implemented by hardware related to program instructions, and the program can be stored in a readable medium.

[0128] This invention also provides a readable storage medium storing a computer program, which, when executed by a processor, can perform the above-described functions. Figure 3 or Figure 4 Any step in the corresponding method embodiment can achieve the same technical effect, and will not be repeated here to avoid repetition.

[0129] The storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0130] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A signal transmission method, characterized in that, Applied to transmitting devices, including: Obtain time-domain data corresponding to at least two identical orthogonal frequency division multiplexing (OFDM) symbols, wherein the time-domain data corresponding to each of the at least two identical OFDM symbols are concatenated end-to-end to form multiple consecutive OFDM symbols; Transmit the time-domain data corresponding to the at least two identical OFDM symbols; Obtaining the time-domain data corresponding to the at least two identical orthogonal frequency division multiplexing (OFDM) symbols includes: Determine the frequency domain data corresponding to each symbol in the at least two identical OFDM symbols, and the frequency domain phase difference corresponding to each symbol in the at least two identical OFDM symbols; Multiply the frequency domain data and frequency domain phase difference of the same symbol in the at least two identical OFDM symbols to obtain the first frequency domain data corresponding to each symbol in the at least two identical OFDM symbols; Based on the first frequency domain data, the time domain data corresponding to the at least two identical OFDM symbols are obtained.

2. The method according to claim 1, characterized in that, The step of obtaining the time-domain data corresponding to the at least two identical OFDM symbols based on the first frequency-domain data includes: Perform an inverse Fourier transform on the first frequency domain data corresponding to each symbol to obtain time domain data corresponding to at least two identical OFDM symbols; or perform an inverse Fourier transform on the first frequency domain data corresponding to each symbol to obtain at least two first time domain data; add a cyclic prefix to the at least two first time domain data to obtain time domain data corresponding to at least two identical OFDM symbols.

3. A signal receiving method, characterized in that, Applied to receiving devices, including: Receive at least a portion of time-domain data corresponding to at least two identical orthogonal frequency division multiplexing (OFDM) symbols, wherein the time-domain data corresponding to each of the at least two identical OFDM symbols are concatenated end-to-end to form multiple consecutive OFDM symbols; The time-domain data corresponding to the at least two identical orthogonal frequency division multiplexing (OFDM) symbols are obtained in the following manner: Determine the frequency domain data corresponding to each symbol in the at least two identical OFDM symbols, and the frequency domain phase difference corresponding to each symbol in the at least two identical OFDM symbols; Multiply the frequency domain data and frequency domain phase difference of the same symbol in the at least two identical OFDM symbols to obtain the first frequency domain data corresponding to each symbol in the at least two identical OFDM symbols; Based on the first frequency domain data, the time domain data corresponding to the at least two identical OFDM symbols are obtained.

4. The method according to claim 3, characterized in that, The method for receiving the time-domain data corresponding to the at least two identical OFDM symbols is merged reception.

5. The method according to claim 3, characterized in that, The time-domain data corresponding to the at least two identical OFDM symbols is obtained by sequentially performing phase shift and inverse Fourier transform on the frequency-domain data corresponding to the at least two identical OFDM symbols.

6. The method according to claim 5, characterized in that, After receiving time-domain data corresponding to at least two identical OFDM symbols, the method further includes: Perform a Fourier transform on the time-domain data corresponding to the at least two identical OFDM symbols to obtain at least two first frequency-domain data. Phase difference compensation is performed on the at least two first frequency domain data to obtain frequency domain data corresponding to each symbol in the at least two identical OFDM symbols.

7. The method according to claim 3, characterized in that, The time-domain data corresponding to the at least two identical OFDM symbols is obtained by sequentially performing phase shift, inverse Fourier transform, and adding a cyclic prefix on the frequency-domain data corresponding to the at least two identical OFDM symbols.

8. The method according to claim 7, characterized in that, After receiving time-domain data corresponding to at least two identical OFDM symbols, the method further includes: Remove the cyclic prefix from the time-domain data corresponding to the at least two identical OFDM symbols to obtain the first time-domain data; Perform a Fourier transform on the first time-domain data to obtain at least two first frequency-domain data. Phase difference compensation is performed on the at least two first frequency domain data to obtain frequency domain data corresponding to each symbol in the at least two identical OFDM symbols.

9. A signal transmitting device, characterized in that, include: A first processor is configured to obtain time-domain data corresponding to at least two identical orthogonal frequency division multiplexing (OFDM) symbols, wherein the time-domain data corresponding to each of the at least two identical OFDM symbols are concatenated end-to-end to form multiple consecutive OFDM symbols. A first transceiver is used to transmit time-domain data corresponding to the at least two identical OFDM symbols; The first processor is further configured to determine the frequency domain data corresponding to each symbol in the at least two identical OFDM symbols, and the frequency domain phase difference corresponding to each symbol in the at least two identical OFDM symbols; Multiply the frequency domain data and frequency domain phase difference of the same symbol in the at least two identical OFDM symbols to obtain the first frequency domain data corresponding to each symbol in the at least two identical OFDM symbols; Based on the first frequency domain data, the time domain data corresponding to the at least two identical OFDM symbols are obtained.

10. A signal receiving device, characterized in that, include: The second transceiver is configured to receive at least a portion of the time-domain data corresponding to at least two identical orthogonal frequency division multiplexing (OFDM) symbols, wherein the time-domain data corresponding to each of the at least two identical OFDM symbols are concatenated end-to-end to form a plurality of consecutive OFDM symbols. The time-domain data corresponding to the at least two identical orthogonal frequency division multiplexing (OFDM) symbols are obtained in the following manner: Determine the frequency domain data corresponding to each symbol in the at least two identical OFDM symbols, and the frequency domain phase difference corresponding to each symbol in the at least two identical OFDM symbols; Multiply the frequency domain data and frequency domain phase difference of the same symbol in the at least two identical OFDM symbols to obtain the first frequency domain data corresponding to each symbol in the at least two identical OFDM symbols; Based on the first frequency domain data, the time domain data corresponding to the at least two identical OFDM symbols are obtained.

11. A communication device, comprising: A transceiver, a memory, a processor, and a program stored in the memory and executable on the processor; characterized in that the processor is configured to read the program in the memory to implement the steps of the signal transmission method as claimed in any one of claims 1 to 2; or, the steps of the signal reception method as claimed in any one of claims 3 to 8.

12. A readable storage medium for storing a program, characterized in that, When the program is executed by the processor, it implements the steps of the signal transmission method as described in any one of claims 1 to 2; Alternatively, the steps in the signal receiving method as described in any one of claims 3 to 8.

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