OFDM signal processing method, transmission system, and device

Abstract

The present invention provides an OFDM signal processing method, transmission system, and device for effectively reducing the peak-to-average power ratio of an OFDM signal, which includes: determining a frequency of an OFDM modulation symbol obtained by digitally modulating an OFDM signal; determining a frequency domain function value corresponding to the frequency of the OFDM modulation symbol based on a frequency domain function and the frequency of the OFDM modulation symbol, where the frequency domain function is obtained by linearly combining a first-order linear function and a trigonometric function of a different frequency; determining a coding matrix corresponding to the OFDM signal according to the frequency domain function value corresponding to the OFDM modulation symbol; and processing the OFDM signal using the coding matrix corresponding to the OFDM signal to obtain a target OFDM signal according to a variation rule of the frequency domain function.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and particularly to an OFDM signal processing method, a transmission system, and a device.

Background Art

[0002] Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation technique that divides carriers into a plurality of sub-carriers orthogonal to each other in order to overcome frequency selective fading and narrowband interference. However, in an OFDM system, when sub-carriers are superimposed, the peak power of the signal becomes much larger than its average power, that is, a high PAPR (Peak to Average Power Ratio) occurs. In some scenarios, due to power limitations, a high peak-to-average power ratio causes out-of-band radiation and in-band distortion in a non-linear transmission channel. As a result, distortion occurs in the signal, the bit error rate of the system increases, and the performance of the OFDM communication system deteriorates.

[0003] Currently, methods for suppressing the peak-to-average power ratio of an OFDM system include, for example, a clipping method, a coding method, and a probabilistic method. However, the clipping method generates clipping noise, which increases the bit error rate of the system and degrades the performance of the system. The coding method does not cause distortion in the signal, but is computationally complex and generates a large amount of redundant data. The probabilistic method is simple and intuitive, but has a large amount of computation and requires the transmission of sideband information, which increases the implementation difficulty and cost of the system.

Summary of the Invention

[0004] The present invention provides an OFDM signal processing method, transmission system, and device for effectively reducing the PAPR of OFDM signals by a probabilistic method that is easy to implement and does not require the transmission of sideband information, thereby improving the communication performance and sensing performance of an OFDM system.

[0005] In a first embodiment, an embodiment of the present invention provides an OFDM signal processing method, which is: Determining the frequency of the OFDM modulation symbol obtained by digitally modulating the OFDM signal, The method involves determining a frequency-domain function value corresponding to the frequency of the OFDM modulation symbol based on the frequency-domain function and the frequency of the OFDM modulation symbol, wherein the frequency-domain function is obtained by linearly combining a first-order linear function and trigonometric functions of different frequencies. The coding matrix corresponding to the OFDM signal is determined by the frequency domain function value corresponding to the OFDM modulation symbol, The OFDM signal is processed using an encoding matrix corresponding to the OFDM signal, and a target OFDM signal is obtained that conforms to the rule of change of the frequency domain function. Includes.

[0006] In the OFDM signal processing method according to this embodiment, a frequency-domain function is constructed by linearly combining a first-order linear function and trigonometric functions of different frequencies. An encoding matrix is ​​constructed using the frequency-domain function values ​​corresponding to the frequencies of the OFDM modulation symbols. The entire OFDM signal is processed using this encoding matrix, so that the processed target OFDM signal follows the rules of change of the frequency-domain function. On the other hand, since the frequency-domain function is constructed by linearly combining a first-order linear function and trigonometric functions of different frequencies, the rules of change of the OFDM signal spectrum can satisfy the requirement of a low PAPR. Therefore, the PAPR of OFDM can be effectively reduced by a stochastic method that is easy to implement and does not require the transmission of sideband information. This not only improves the communication performance of the OFDM system but also improves the sensing performance.

[0007] As a selective embodiment, determining the frequency of the OFDM modulation symbol is Based on the bandwidth of the OFDM modulation symbol and a first preset parameter, the start frequency, frequency step value, and end frequency of the OFDM modulation symbol are determined. This includes determining the frequency of the OFDM modulation symbol based on the start frequency, frequency step value, and end frequency.

[0008] In an optional embodiment, the first preset parameter includes a roll-off coefficient, a target symbol length, and a first parameter, wherein the target symbol length represents the length of the OFDM modulated symbol after processing by the coding matrix. Determining the start frequency, frequency step value, and end frequency of the OFDM modulation symbol based on the bandwidth of the OFDM modulation symbol and a first preset parameter is: Based on the bandwidth, roll-off coefficient, and target symbol length of the OFDM modulation symbol, the start frequency and end frequency are determined. This includes determining a frequency step value based on the bandwidth, roll-off coefficient, and first parameter of the OFDM modulation symbol.

[0009] As a selective embodiment, determining the frequency domain function value corresponding to the frequency of the OFDM modulation symbol based on the frequency domain function and the frequency of the OFDM modulation symbol is: Based on the bandwidth and roll-off coefficient of the OFDM modulation symbol, a first threshold and a second threshold are determined. The method includes determining a frequency domain function value corresponding to the frequency of the OFDM modulation symbol based on the frequency domain function and the frequency of the OFDM modulation symbol, if the absolute value of the frequency of the OFDM modulation symbol is greater than a first threshold and less than a second threshold.

[0010] As a selective embodiment, when determining the frequency domain function, The frequency-domain function is determined by calculating a weighted sum of the linear function and the trigonometric function of different frequencies, according to the respective weights of the linear function and the trigonometric function of different frequencies.

[0011] In a selective embodiment, the slope of the first-order linear function changes according to the changes in the bandwidth and roll-off coefficient of the OFDM signal.

[0012] As an optional embodiment, when determining the first linear function, The slope is determined based on the bandwidth and roll-off coefficient of the OFDM modulation symbol, and the slope decreases as the bandwidth and roll-off coefficient increase. Based on the bandwidth, roll-off coefficient, and frequency of the OFDM modulation symbol, the linear function variable is determined. The first-order linear function is determined based on the slope and the linear function variables.

[0013] As an optional embodiment, The phases of the trigonometric functions of different frequencies change according to the change in the roll-off coefficient of the OFDM signal, and / or The amplitude of the trigonometric function increases with increasing number of trigonometric functions.

[0014] As an optional embodiment, when determining the trigonometric functions, The phase of the trigonometric function is determined based on the roll-off coefficient of the OFDM signal. Based on the bandwidth, roll-off coefficient, and frequency of the OFDM modulation symbol, the trigonometric function variables are determined. The trigonometric function is determined based on the phase and the trigonometric function variables.

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[0016] JPEG0007838124000002.jpg20170

[0017] As a selective embodiment, determining the encoding matrix corresponding to the OFDM signal according to the frequency domain function value corresponding to the OFDM modulation symbol includes: determining the frequency domain function value corresponding to the OFDM modulation symbol as an encoding matrix coefficient; and determining the encoding matrix corresponding to the OFDM signal based on the value of the product of the encoding matrix coefficient corresponding to the OFDM modulation symbol and a phase factor.

[0018] As a selective embodiment, the phase factor exhibits a change rule of an exponential function according to a change in a second preset parameter of the OFDM modulation symbol; the second preset parameter includes a target symbol length and an extension coefficient, and the target symbol length is for representing the length of the OFDM modulation symbol after being processed by the encoding matrix.

[0019] As a selective embodiment, processing the OFDM signal by the encoding matrix corresponding to the OFDM signal to obtain a target OFDM signal according to the change rule of the frequency domain function includes: multiplying the OFDM signal by the encoding matrix corresponding to the OFDM signal to obtain a target OFDM signal according to the change rule of the frequency domain function.

[0020] In a second aspect, an embodiment of the present invention provides an encoding matrix determination method. The method includes: determining the frequency of an OFDM modulation symbol obtained by digitally modulating an OFDM signal; determining a frequency domain function value corresponding to the frequency of the OFDM modulation symbol based on a frequency domain function and the frequency of the OFDM modulation symbol, where the frequency domain function is obtained by linearly combining a linear function and trigonometric functions of different frequencies; and determining the encoding matrix corresponding to the OFDM signal according to the frequency domain function value corresponding to the OFDM modulation symbol.

[0021] As a selective embodiment, determining the frequency of the OFDM modulation symbol includes determining the start frequency, frequency step value, and end frequency of the OFDM modulation symbol based on the bandwidth of the OFDM modulation symbol and a first preset parameter, and determining the frequency of the OFDM modulation symbol based on the start frequency, frequency step value, and end frequency.

[0022] As a selective embodiment, the first preset parameter includes a roll-off coefficient, a target symbol length, and a first parameter. The target symbol length is for representing the length of the OFDM modulation symbol after being processed by the encoding matrix. Determining the start frequency, frequency step value, and end frequency of the OFDM modulation symbol based on the bandwidth of the OFDM modulation symbol and a first preset parameter includes determining the start frequency and end frequency based on the bandwidth, roll-off coefficient, and target symbol length of the OFDM modulation symbol, and determining the frequency step value based on the bandwidth, roll-off coefficient, and first parameter of the OFDM modulation symbol.

[0023] As a selective embodiment, determining the frequency-domain function value corresponding to the frequency of the OFDM modulation symbol based on the frequency-domain function and the frequency of the OFDM modulation symbol includes determining a first threshold and a second threshold based on the bandwidth and roll-off coefficient of the OFDM modulation symbol, and when the absolute value of the frequency of the OFDM modulation symbol is greater than the first threshold and less than the second threshold, determining the frequency-domain function value corresponding to the frequency of the OFDM modulation symbol based on the frequency-domain function and the frequency of the OFDM modulation symbol.

[0024] As a selective embodiment, when determining the frequency-domain function The frequency-domain function is determined by calculating a weighted sum of the linear function and the trigonometric function of different frequencies, according to the respective weights of the linear function and the trigonometric function of different frequencies.

[0025] In a selective embodiment, the slope of the first-order linear function changes according to the changes in the bandwidth and roll-off coefficient of the OFDM signal.

[0026] As an optional embodiment, when determining the first linear function, The slope is determined based on the bandwidth and roll-off coefficient of the OFDM modulation symbol, and the slope decreases as the bandwidth and roll-off coefficient increase. Based on the bandwidth, roll-off coefficient, and frequency of the OFDM modulation symbol, the linear function variable is determined. The first-order linear function is determined based on the slope and the linear function variables.

[0027] As an optional embodiment, The phases of the trigonometric functions of different frequencies change according to the change in the roll-off coefficient of the OFDM signal, and / or The amplitude of the trigonometric function increases with increasing number of trigonometric functions.

[0028] As an optional embodiment, when determining the trigonometric functions, The phase of the trigonometric function is determined based on the roll-off coefficient of the OFDM signal. Based on the bandwidth, roll-off coefficient, and frequency of the OFDM modulation symbol, the trigonometric function variables are determined. The trigonometric function is determined based on the phase and the trigonometric function variables.

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[0030] JPEG0007838124000004.jpg20170

[0031] As a selective embodiment, determining the coding matrix corresponding to the OFDM signal by the frequency domain function value corresponding to the OFDM modulation symbol is: The frequency domain function value corresponding to the OFDM modulation symbol is determined as the coding matrix coefficient, This includes determining the coding matrix corresponding to the OFDM signal based on the product of the coding matrix coefficient and the phase factor corresponding to the OFDM modulation symbol.

[0032] As an optional embodiment, The phase factor exhibits an exponential change rule in accordance with the change of the second preset parameter of the OFDM modulation symbol. The second preset parameter includes a target symbol length and an expansion coefficient, the target symbol length being for representing the length of the OFDM modulated symbol after processing by the coding matrix.

[0033] In a third embodiment, an embodiment of the present invention provides a method for determining the inverse coding matrix. This method is Obtaining an encoding matrix determined by the method described in any one of the second aspects, The coding matrix is ​​reverse-processed to determine the inverse coding matrix, Includes.

[0034] In a fourth embodiment, an embodiment of the present invention provides an OFDM signal transmission method. This method is Determining the target OFDM signal by the method described in any one of the first embodiments, This includes transmitting the aforementioned target OFDM signal.

[0035] In a fifth embodiment, an embodiment of the present invention provides an OFDM signal receiving method. This method is Receiving a target OFDM signal determined by the method described in any one of the first embodiments, wherein the target OFDM signal is obtained by processing with an encoding matrix corresponding to an OFDM signal, The process includes processing the target OFDM signal with an inverse coding matrix to obtain an OFDM signal, wherein the inverse coding matrix is ​​obtained by inversely processing the coding matrix corresponding to the OFDM signal.

[0036] In a sixth embodiment, an embodiment of the present invention provides an OFDM signaling system, which includes network equipment and terminals. The network device is for determining a target OFDM signal by the method described in any one of the first embodiments and transmitting the target OFDM signal to a terminal, wherein the target OFDM signal is obtained by processing with an encoding matrix corresponding to an OFDM signal. The terminal is used to process the target OFDM signal using an inverse coding matrix and to acquire the OFDM signal, and the inverse coding matrix is ​​obtained by inversely processing the coding matrix corresponding to the OFDM signal.

[0037] In a seventh embodiment, an embodiment of the present invention provides a network device comprising a processor and memory, the memory for storing a program executable by the processor, and the processor for reading the program from the memory and performing the following steps, namely, Determining the frequency of the OFDM modulation symbol obtained by digitally modulating the OFDM signal, The method involves determining a frequency-domain function value corresponding to the frequency of the OFDM modulation symbol based on the frequency-domain function and the frequency of the OFDM modulation symbol, wherein the frequency-domain function is obtained by linearly combining a first-order linear function and trigonometric functions of different frequencies. The coding matrix corresponding to the OFDM signal is determined by the frequency domain function value corresponding to the OFDM modulation symbol, The OFDM signal is processed using an encoding matrix corresponding to the OFDM signal, and a target OFDM signal is obtained that conforms to the rule of change of the frequency domain function. Execute this.

[0038] As an optional embodiment, the processor specifically, Based on the bandwidth of the OFDM modulation symbol and a first preset parameter, the start frequency, frequency step value, and end frequency of the OFDM modulation symbol are determined. The frequency of the OFDM modulation symbol is determined based on the start frequency, frequency step value, and end frequency. It is configured to execute.

[0039] In an optional embodiment, the first preset parameter includes a roll-off coefficient, a target symbol length, and a first parameter, wherein the target symbol length represents the length of the OFDM modulated symbol after processing by the coding matrix. The aforementioned processor, specifically, Based on the bandwidth, roll-off coefficient, and target symbol length of the OFDM modulation symbol, the start frequency and end frequency are determined. The frequency step value is determined based on the bandwidth, roll-off coefficient, and first parameter of the OFDM modulation symbol. It is configured to execute.

[0040] As an optional embodiment, the processor specifically, Based on the bandwidth and roll-off coefficient of the OFDM modulation symbol, a first threshold and a second threshold are determined. If the absolute value of the frequency of the OFDM modulation symbol is greater than the first threshold and less than the second threshold, the frequency domain function value corresponding to the frequency of the OFDM modulation symbol is determined based on the frequency domain function and the frequency of the OFDM modulation symbol. It is configured to execute.

[0041] In a selective embodiment, the processor is configured to determine the frequency domain function in the following manner. The frequency-domain function is obtained by calculating a weighted sum of the linear function and the trigonometric function of different frequencies, according to the respective weights of the linear function and the trigonometric function of different frequencies.

[0042] In a selective embodiment, the slope of the first-order linear function changes according to the changes in the bandwidth and roll-off coefficient of the OFDM signal.

[0043] As an optional embodiment, the processor is configured to determine the first-order linear function in the following manner. The slope is determined based on the bandwidth and roll-off coefficient of the OFDM modulation symbol, and the slope decreases as the bandwidth and roll-off coefficient increase. Based on the bandwidth, roll-off coefficient, and frequency of the OFDM modulation symbol, the linear function variable is determined. The first-order linear function is determined based on the slope and the linear function variables.

[0044] As an optional embodiment, The phases of the trigonometric functions of different frequencies change according to the change in the roll-off coefficient of the OFDM signal, and / or The amplitude of the trigonometric function increases with increasing number of trigonometric functions.

[0045] In an optional embodiment, the processor is configured to determine the trigonometric function in the following manner: The phase of the trigonometric function is determined based on the roll-off coefficient of the OFDM signal. Based on the bandwidth, roll-off coefficient, and frequency of the OFDM modulation symbol, the trigonometric function variables are determined. The trigonometric function is determined based on the phase and the trigonometric function variables.

[0046] JPEG0007838124000005.jpg91170

[0047] JPEG0007838124000006.jpg20170

[0048] As an optional embodiment, the processor specifically, The frequency domain function value corresponding to the OFDM modulation symbol is determined as the coding matrix coefficient, The coding matrix corresponding to the OFDM signal is determined based on the product of the coding matrix coefficient and the phase factor corresponding to the OFDM modulation symbol, It is configured to execute.

[0049] As an optional embodiment, The phase factor exhibits an exponential change rule in accordance with the change of the second preset parameter of the OFDM modulation symbol. The second preset parameter includes a target symbol length and an expansion coefficient, the target symbol length being for representing the length of the OFDM modulated symbol after processing by the coding matrix.

[0050] As an optional embodiment, the processor specifically, The OFDM signal is multiplied by the coding matrix corresponding to the OFDM signal to obtain a target OFDM signal that follows the rule of change of the frequency domain function. It is configured to execute.

[0051] In an eighth embodiment, an embodiment of the present invention provides an OFDM signal processing device. This OFDM signal processing device is A frequency determination module for determining the frequency of OFDM modulated symbols obtained by digitally modulating an OFDM signal, A frequency domain function module for determining a frequency domain function value corresponding to the frequency of an OFDM modulation symbol based on a frequency domain function and the frequency of the OFDM modulation symbol, wherein the frequency domain function is obtained by linearly combining a first-order linear function and trigonometric functions of different frequencies. A coding matrix module for determining the coding matrix corresponding to the OFDM signal based on the frequency domain function value corresponding to the OFDM modulation symbol, The system includes a peak-to-average power ratio reduction module for processing the OFDM signal using an encoding matrix corresponding to the OFDM signal and obtaining a target OFDM signal that conforms to the rules of change of the frequency domain function.

[0052] As a selective embodiment, the frequency determination module specifically, Based on the bandwidth of the OFDM modulation symbol and the first preset parameters, the start frequency, frequency step value, and end frequency of the OFDM modulation symbol are determined. Based on the start frequency, frequency step value, and end frequency, the frequency of the OFDM modulation symbol is determined. It is for that purpose.

[0053] In an optional embodiment, the first preset parameter includes a roll-off coefficient, a target symbol length, and a first parameter, wherein the target symbol length represents the length of the OFDM modulated symbol after processing by the coding matrix. The frequency determination module specifically, Based on the bandwidth, roll-off coefficient, and target symbol length of the OFDM modulation symbol, the start frequency and end frequency are determined. Based on the bandwidth, roll-off coefficient, and first parameter of the OFDM modulation symbol, the frequency step value is determined. It is for that purpose.

[0054] As a selective embodiment, the frequency domain function module specifically, Based on the bandwidth and roll-off coefficient of the OFDM modulation symbol, a first threshold and a second threshold are determined. If the absolute value of the frequency of the OFDM modulation symbol is greater than a first threshold and less than a second threshold, the frequency domain function value corresponding to the frequency of the OFDM modulation symbol is determined based on the frequency domain function and the frequency of the OFDM modulation symbol. It is for that purpose.

[0055] As an optional embodiment, the frequency-domain function module is specifically for determining the frequency-domain function in the following manner. The frequency-domain function is obtained by calculating a weighted sum of the linear function and the trigonometric function of different frequencies, according to the respective weights of the linear function and the trigonometric function of different frequencies.

[0056] In a selective embodiment, the slope of the first-order linear function changes according to the changes in the bandwidth and roll-off coefficient of the OFDM signal.

[0057] As a selective embodiment, the frequency domain function module is specifically for determining the first-order linear function in the following manner. The slope is determined based on the bandwidth and roll-off coefficient of the OFDM modulation symbol, and the slope decreases as the bandwidth and roll-off coefficient increase. Based on the bandwidth, roll-off coefficient, and frequency of the OFDM modulation symbol, the linear function variable is determined. The first-order linear function is determined based on the slope and the linear function variables.

[0058] As an optional embodiment, The phases of the trigonometric functions of different frequencies change according to the change in the roll-off coefficient of the OFDM signal, and / or The amplitude of the trigonometric function increases with increasing number of trigonometric functions.

[0059] As an optional embodiment, the frequency domain function module is specifically for determining the trigonometric functions in the following manner. The phase of the trigonometric function is determined based on the roll-off coefficient of the OFDM signal. Based on the bandwidth, roll-off coefficient, and frequency of the OFDM modulation symbol, the trigonometric function variables are determined. The trigonometric function is determined based on the phase and the trigonometric function variables.

[0060] JPEG0007838124000007.jpg91170

[0061] JPEG0007838124000008.jpg21170

[0062] As a selective embodiment, the coding matrix module specifically, The frequency domain function value corresponding to the OFDM modulation symbol is determined as the coding matrix coefficient, Based on the product of the coding matrix coefficient and phase factor corresponding to the OFDM modulation symbol, the coding matrix corresponding to the OFDM signal is determined. It is for that purpose.

[0063] As an optional embodiment, The phase factor exhibits an exponential change rule in accordance with the change of the second preset parameter of the OFDM modulation symbol. The second preset parameter includes a target symbol length and an expansion coefficient, wherein the target symbol length represents the length of the OFDM modulated symbol after processing by the coding matrix.

[0064] As a selective embodiment, the peak-to-average power ratio reduction module specifically comprises: The OFDM signal is multiplied by the coding matrix corresponding to the OFDM signal to obtain a target OFDM signal that follows the rule of change of the frequency domain function. It is for that purpose.

[0065] In a ninth embodiment, an embodiment of the present invention provides a computer storage medium in which a computer program is stored, and when the computer program is executed by a processor, the steps of the method described in any one of the first embodiments described above are realized.

[0066] In a tenth embodiment, the present invention provides a computer program product comprising computer program code, which, when executed on a computer, causes the computer to perform the method described in any one of the first embodiments.

[0067] These or other embodiments of the present invention will be described more concisely and clearly in the following description of the embodiments. [Brief explanation of the drawing]

[0068] To more clearly explain the technical concepts of the embodiments of the present invention, the drawings necessary for describing the embodiments are briefly described below. It will be apparent to those skilled in the art that the drawings described below are merely some embodiments of the present invention, and that other drawings can be obtained based on these drawings without requiring any creative effort.

[0069] [Figure 1] Figure 1 is a flowchart illustrating the OFDM signal processing method according to an embodiment of the present invention. [Figure 2] Figures 2A and 2B are flowcharts for determining the coding matrix according to an embodiment of the present invention. [Figure 3] Figure 3 is a schematic diagram of the process for obtaining the inverse coding matrix according to an embodiment of the present invention. [Figure 4] Figures 4A and 4B are detailed flowcharts illustrating the implementation of the OFDM signal processing method according to an embodiment of the present invention. [Figure 5] Figure 5 is a schematic diagram comparing the CCDF performance of the original OFDM signal according to an embodiment of the present invention and the OFDM signal processed by the coding matrix. [Figure 6] Figure 6 is a flowchart showing the implementation of the coding matrix determination method according to an embodiment of the present invention. [Figure 7] Figure 7 is a flowchart showing the implementation of the inverse coding matrix determination method according to an embodiment of the present invention. [Figure 8] Figure 8 is a flowchart illustrating the implementation of the OFDM signal transmission method according to an embodiment of the present invention. [Figure 9] Figure 9 is a flowchart illustrating the implementation of an OFDM signal receiving method according to an embodiment of the present invention. [Figure 10] Figure 10 is a schematic diagram of an OFDM signal system according to an embodiment of the present invention. [Figure 11] Figure 11 is a schematic diagram of a network device according to an embodiment of the present invention. [Figure 12] Figure 12 is a schematic diagram of a terminal according to an embodiment of the present invention. [Figure 13] Figure 13 is a schematic diagram of an OFDM signal processing device according to an embodiment of the present invention. [Modes for carrying out the invention]

[0070] To further clarify the object, technical concept, and advantages of the present invention, the invention will be described in more detail below with reference to the drawings. It is clear that the embodiments described are not all embodiments, but merely a selection of embodiments of the present invention. All other embodiments that can be obtained by those skilled in the art without requiring any creative effort based on the embodiments of the present invention are all within the scope of the protection of the present invention.

[0071] In embodiments of the present invention, the terms "and / or" merely describe a correlation between related objects, indicating that three relationships may exist. For example, A and / or B may indicate that A exists alone, that A and B exist simultaneously, or that B exists alone. The symbol " / " typically indicates that related objects in the context are in an "or" relationship.

[0072] The application scenarios described in the embodiments of the present invention are intended to more clearly illustrate the technical solutions of the embodiments of the present invention and do not limit the technical solutions related to the embodiments of the present invention. Those skilled in the art will see that, as new application scenarios emerge, the technical solutions related to the embodiments of the present invention are also applicable to similar technical problems. However, in the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0073] Before describing the OFDM signal processing method according to an embodiment of the present invention, the technical background of the embodiment of the present invention will be described in detail below to facilitate understanding.

[0074] Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation technique that divides a carrier into multiple mutually orthogonal subcarriers to overcome frequency-selective fading and narrowband interference. Therefore, OFDM offers greater choice for time slots, subcarriers, etc., included in each subframe as a communication signal in 5G NR (5G New Radio, a global 5G standard based on OFDM's new wireless technology design), supporting not only different communication scenarios but also effectively different sensing scenarios. However, in OFDM systems, the superposition of subcarriers causes the peak power of the signal to become much larger than its average power, resulting in a high PAPR (Peak to Average Power Ratio). In some scenarios, where power is limited, a high PAPR leads to out-of-band radiation and in-band distortion in nonlinear transmission channels, resulting in signal distortion, increased bit error rate, and degraded performance of OFDM communication systems.

[0075] Methods for suppressing the peak-to-average power ratio (PAPR) in OFDM systems primarily include pre-distortion, coding, and stochastic methods. Pre-distortion methods reduce the PAPR of a signal by non-linearly transforming the signal so that the peak value is within the linear dynamic range of the amplifier before the signal enters the power amplifier; examples include clipping and compression transformation. Coding methods generate different sets of codes using different coding methods, and finally select the set of codes with the smallest PAPR for symbol transmission. Stochastic methods reduce the probability of large peaks appearing in the signal by performing processing such as weighting on the signal; examples include linear transformation (LT), selective mapping (SLM), partial transmission sequence method (PTS), and iteratively flipping part of the transmission sequence (IPTS). Clipping is a technique for reducing the peak-to-average power ratio of OFDM signals; while the technique is simple, it generates clipping noise, which increases the system's bit error rate and degrades system performance. Encoding techniques include block coding, which does not distort the signal but is computationally complex and generates a lot of redundant data. Probabilistic techniques mainly include selective mapping (SLM) and partial transmission sequencing (PTS). Of these, SLM and PTS are simple and intuitive, but require a large amount of computation and need to transmit sideband information, which increases the difficulty and cost of system implementation.

[0076] The OFDM signal processing method according to the present invention utilizes the fundamental concept of stochastic methods to construct a frequency-domain function by linearly combining a linear function and trigonometric functions of different frequencies. A coding matrix is ​​constructed using the frequency-domain function values ​​corresponding to the frequencies of the OFDM modulation symbols. The entire OFDM signal is then processed using this coding matrix, so that the processed target OFDM signal follows a rule of frequency-domain function change. The frequency-domain function constructed in this invention is composed of a linear combination of a linear function and trigonometric functions of different frequencies. This linear combination of a linear function and trigonometric functions of different frequencies allows the OFDM signal spectrum change rule to satisfy the requirement of a low PAPR (Periodic Action Revision Rate). Therefore, the PAPR of the OFDM signal can be effectively reduced by a stochastic method that is easy to implement and does not require the transmission of sideband information. This not only improves the communication performance of the OFDM system but also enhances its sensing performance.

[0077] In the OFDM signal processing method according to an embodiment of the present invention, the key feature is the design of an encoding matrix for PAPR reduction. A frequency-domain function is constructed by linearly combining a frequency-related linear function and trigonometric functions of different frequencies. Based on the constructed frequency-domain function, the frequency-domain function value of each OFDM modulation symbol is determined, and an encoding matrix is ​​constructed using the frequency-domain function values. As a result, the OFDM signal is processed using the encoding matrix for PAPR reduction. This encoding matrix for PAPR reduction is easy to implement, does not require the transmission of sideband information, and can effectively reduce the PAPR of the OFDM signal. This not only improves the communication performance of the OFDM system but also improves the sensing performance.

[0078] As shown in Figure 1, the OFDM signal processing method according to an embodiment of the present invention may be applied to network equipment such as 5G gNBs, macro base stations, micro base stations, CUs (Central Units), or DUs (Distributed Units). The specific implementation flow of the method is as follows.

[0079] In step 100, the frequency of the OFDM modulation symbol obtained by digitally modulating the OFDM signal is determined.

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[0082] A second preset parameter may be optionally set. The second preset parameter includes a target symbol length N and an expansion factor L.

[0083] In some embodiments, this embodiment determines the frequency of the OFDM modulation symbol in the following manner. Based on the bandwidth of the OFDM modulation symbol and a first preset parameter, the start frequency, frequency step value, and end frequency of the OFDM modulation symbol are determined. Based on the start frequency, frequency step value, and end frequency, the frequency of the OFDM modulation symbol is determined.

[0084] In some embodiments, the first preset parameter includes a roll-off coefficient, a target symbol length, and a first parameter. The start frequency and end frequency are determined based on the bandwidth of the OFDM modulated symbol, the roll-off coefficient, and the target symbol length. The frequency step value is determined based on the bandwidth of the OFDM modulated symbol, the roll-off coefficient, and the first parameter.

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[0088] In step 101, a frequency domain function value corresponding to the frequency of the OFDM modulation symbol is determined based on the frequency domain function and the frequency of the OFDM modulation symbol. The frequency domain function is obtained by linearly combining a first-order linear function with trigonometric functions of different frequencies.

[0089] Selectively, the trigonometric functions of different frequencies in this embodiment include, but are not limited to, sine functions of different frequencies, cosine functions of different frequencies, or combinations of sine and cosine functions of different frequencies.

[0090] Selectively, trigonometric functions of different frequencies include, but are not limited to, trigonometric functions of different harmonics. This embodiment does not overly limit this.

[0091] In some embodiments, the relationship between the frequency of the OFDM modulation symbol and the first and second thresholds is first determined, and the frequency-domain function value is determined based on the different determination results. The specific determination process is as follows. Based on the bandwidth and roll-off coefficient of the OFDM modulation symbol, a first threshold and a second threshold are determined. If the absolute value of the frequency of the OFDM modulation symbol is greater than a first threshold and less than a second threshold, the frequency domain function value corresponding to the frequency of the OFDM modulation symbol is determined based on the frequency domain function and the frequency of the OFDM modulation symbol.

[0092] JPEG0007838124000014.jpg40170

[0093] Selectively, if the absolute value of the frequency of the OFDM modulation symbol is less than or equal to a first threshold, the frequency domain function value corresponding to the frequency of the OFDM modulation symbol is determined to be 1, or If the absolute value of the frequency of the OFDM modulation symbol is greater than or equal to the second threshold, the frequency domain function value corresponding to the frequency of the OFDM modulation symbol is determined to be 0.

[0094] JPEG0007838124000015.jpg40170

[0095] In some embodiments, the frequency domain function is determined by the following method. The frequency-domain function is obtained by calculating a weighted sum of a linear function and a sine function of a different frequency, according to the respective weights of the linear function and the sine function of a different frequency.

[0096] In some embodiments, the slope of the first-order linear function changes in accordance with the changes in the bandwidth and roll-off coefficient of the OFDM signal.

[0097] In some embodiments, the first-order linear function is determined by the following method. The slope is determined based on the bandwidth and roll-off coefficient of the OFDM modulation symbol, and the slope decreases as the bandwidth and roll-off coefficient increase. Based on the bandwidth, roll-off coefficient, and frequency of the OFDM modulation symbol, the linear function variable is determined. The first-order linear function is determined based on the slope and the linear function variables.

[0098] JPEG0007838124000016.jpg52168

[0099] In some embodiments, the phases of the trigonometric functions of different frequencies change according to the change in the roll-off coefficient of the OFDM signal.

[0100] In some embodiments, the amplitude of the trigonometric function increases with increasing number of the trigonometric function. If, selectively, the trigonometric function of different frequencies includes a sine function of different frequencies, the amplitude of the sine function increases with increasing number of the sine function. If the trigonometric function of different frequencies includes a cosine function of different frequencies, the amplitude of the cosine function increases with increasing number of the cosine function. If the trigonometric function of different frequencies includes a combination of a sine function of different frequencies and a cosine function of different frequencies, the amplitude of the sine function increases with increasing number of the sine function, and the amplitude of the cosine function increases with increasing number of the cosine function.

[0101] In some embodiments, the trigonometric functions are determined by the following method. The phase of the trigonometric function is determined based on the roll-off coefficient of the OFDM signal. Based on the bandwidth, roll-off coefficient, and frequency of the OFDM modulation symbol, the trigonometric function variables are determined. The trigonometric function is determined based on the phase and the trigonometric function variables.

[0102] JPEG0007838124000017.jpg77170

[0103] JPEG0007838124000018.jpg90170

[0104] JPEG0007838124000019.jpg21170

[0105] JPEG0007838124000020.jpg20170

[0106] In step 102, the coding matrix corresponding to the OFDM signal is determined by the frequency domain function value corresponding to the OFDM modulation symbol.

[0107] In some examples, the coding matrix is ​​determined by the following method. The frequency domain function value corresponding to the OFDM modulation symbol is determined as the coding matrix coefficient, The coding matrix corresponding to the OFDM signal is determined based on the product of the coding matrix coefficient and the phase factor corresponding to the OFDM modulation symbol.

[0108] In some embodiments, the phase factor exhibits an exponential change rule in accordance with a change in a second preset parameter of the OFDM modulation symbol, the second preset parameter including a target symbol length and an expansion coefficient, the target symbol length being for representing the length of the OFDM modulation symbol after processing by the coding matrix.

[0109] JPEG0007838124000021.jpg52169

[0110] JPEG0007838124000022.jpg59170

[0111] In step 103, the OFDM signal is processed by the coding matrix corresponding to the OFDM signal to obtain a target OFDM signal that follows the rule of change of the frequency domain function.

[0112] In some embodiments, the OFDM signal is processed by the coding matrix in the following manner. The OFDM signal is multiplied by the coding matrix corresponding to the OFDM signal to obtain a target OFDM signal that follows the rule for change of the frequency domain function.

[0113] As shown in Figures 2A and 2B, this embodiment further provides a flow for determining the coding matrix. The specific implementation steps are as follows.

[0114] In step 200, perform the initialization settings.

[0115] JPEG0007838124000023.jpg46169

[0116] JPEG0007838124000024.jpg15170

[0117] JPEG0007838124000025.jpg127170

[0118] JPEG0007838124000026.jpg57169

[0119] JPEG0007838124000027.jpg27170

[0120] In step 204, if the absolute value of the frequency of the OFDM modulation symbol is greater than the first threshold and less than the second threshold, the corresponding frequency domain function value is determined based on the frequency and the frequency.

[0121] JPEG0007838124000028.jpg71170

[0122] In step 205, if the absolute value of the frequency of the OFDM modulation symbol is greater than or equal to the second threshold, the frequency domain function value corresponding to the frequency of the OFDM modulation symbol is 0.

[0123] JPEG0007838124000029.jpg21169

[0124] JPEG0007838124000030.jpg25170

[0125] In step 207, the frequency domain function values ​​are used as coding matrix coefficients, and the coding matrix is ​​obtained by multiplying the coding matrix coefficients by the phase factor.

[0126] JPEG0007838124000031.jpg52169

[0127] In some embodiments, the present invention further provides a process for processing a target OFDM signal after it has been received. Specifically, this is as follows: The coding matrix corresponding to the OFDM signal is inversely processed to obtain the inverse coding matrix, The target OFDM signal is processed using the inverse coding matrix, and the OFDM signal is obtained.

[0128] During implementation, when the transmitting side reduces the PAPR of the OFDM signal using the coding matrix of this embodiment, the receiving side needs to restore the original OFDM signal using the inverse coding matrix of that coding matrix. As shown in Figure 3, this embodiment provides a process for obtaining the inverse coding matrix. The inverse coding matrix can be obtained by the following steps.

[0129] JPEG0007838124000032.jpg32169

[0130] JPEG0007838124000033.jpg23170

[0131] JPEG0007838124000034.jpg13170

[0132] JPEG0007838124000035.jpg26170

[0133] Selectively, OFDM signals according to embodiments of the present invention include, but are not limited to, signals obtained by performing OFDM processing on signals such as PDSCH (Physical Downlink Shared Channel), PDCCH (Physical Downlink Control Channel), and PBCH (Physical Broadcast Channel).

[0134] The OFDM signal processing method according to the present invention may be applied to any wireless communication system using OFDM technology. As shown in Figures 4A and 4B, the specific implementation flow of the OFDM signal processing method is as follows, using the application of the OFDM signal processing method to a 5G NR downlink as an example.

[0135] JPEG0007838124000036.jpg52169

[0136] JPEG0007838124000037.jpg28170

[0137] JPEG0007838124000038.jpg46170

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[0140] JPEG0007838124000041.jpg33169

[0141] JPEG0007838124000042.jpg58169

[0142] The coding matrix design for PAPR reduction in this embodiment involves constructing a frequency-domain function by a linear combination of a linear frequency function and trigonometric functions of different frequencies. Then, based on the constructed frequency-domain function, frequency-domain functions are generated using the start frequency, end frequency, and frequency step value of the broadband OFDM signal. Finally, the coding matrix for PAPR reduction is formed by multiplying the different frequency-domain function values ​​by a phase factor. The inverse coding matrix for PAPR reduction is obtained by performing singular value decomposition (SVD) on the coding matrix for PAPR reduction, processing the singular value matrix to obtain a diagonal matrix, and performing operations such as reciprocal calculations. This method can reduce complexity and computational load.

[0143] When the PAPR reduction coding matrix in this embodiment is applied to a broadband OFDM communication system, the transmitting side (e.g., base station) reduces the PAPR of the OFDM using the PAPR reduction coding matrix, and the receiving side (e.g., terminal) restores the original signal using the PAPR reduction inverse coding matrix. This PAPR reduction coding matrix is ​​easy to implement, does not require the transmission of sideband information, and can effectively reduce the PAPR of broadband OFDM, thereby improving not only the communication performance of the OFDM system but also the sensing performance.

[0144] In this embodiment, the method for processing an OFDM signal using an encoding matrix is ​​to obtain a target OFDM signal by directly multiplying the OFDM signal by the encoding matrix. The method for obtaining an OFDM signal is to obtain an OFDM signal by directly multiplying the target OFDM signal by the inverse encoding matrix. This method for processing an OFDM signal using an encoding matrix is ​​simple, easy to implement, can be effectively applied to broadband OFDM communication systems, and can reduce costs.

[0145] Based on the same idea, embodiments of the present invention further provide a coding matrix determination method. Since the principle by which this coding matrix determination method solves the problem is similar to that of the OFDM signal processing method, implementation of the network equipment may refer to the implementation of the above method, but redundant content will be omitted.

[0146] As shown in Figure 6, the specific implementation flow of this coding matrix determination method is as follows.

[0147] In step 600, the frequency of the OFDM modulation symbol obtained by digitally modulating the OFDM signal is determined.

[0148] In step 601, a frequency domain function value corresponding to the frequency of the OFDM modulation symbol is determined based on the frequency domain function and the frequency of the OFDM modulation symbol. The frequency domain function is obtained by linearly combining a first-order linear function with trigonometric functions of different frequencies.

[0149] In step 602, the coding matrix corresponding to the OFDM signal is determined by the frequency domain function value corresponding to the OFDM modulation symbol.

[0150] As a selective embodiment, determining the frequency of the OFDM modulation symbol is Based on the bandwidth of the OFDM modulation symbol and a first preset parameter, the start frequency, frequency step value, and end frequency of the OFDM modulation symbol are determined. This includes determining the frequency of the OFDM modulation symbol based on the start frequency, frequency step value, and end frequency.

[0151] In an optional embodiment, the first preset parameter includes a roll-off coefficient, a target symbol length, and a first parameter, wherein the target symbol length represents the length of the OFDM modulated symbol after processing by the coding matrix.

[0152] Determining the start frequency, frequency step value, and end frequency of the OFDM modulation symbol based on the bandwidth of the OFDM modulation symbol and a first preset parameter is: Based on the bandwidth, roll-off coefficient, and target symbol length of the OFDM modulation symbol, the start frequency and end frequency are determined. This includes determining a frequency step value based on the bandwidth, roll-off coefficient, and first parameter of the OFDM modulation symbol.

[0153] As a selective embodiment, determining the frequency domain function value corresponding to the frequency of the OFDM modulation symbol based on the frequency domain function and the frequency of the OFDM modulation symbol is: Based on the bandwidth and roll-off coefficient of the OFDM modulation symbol, a first threshold and a second threshold are determined. The method includes determining a frequency domain function value corresponding to the frequency of the OFDM modulation symbol based on the frequency domain function and the frequency of the OFDM modulation symbol, if the absolute value of the frequency of the OFDM modulation symbol is greater than a first threshold and less than a second threshold.

[0154] As a selective embodiment, the frequency domain function is determined by the following method. The frequency-domain function is obtained by calculating a weighted sum of the linear function and the trigonometric function of different frequencies, according to the respective weights of the linear function and the trigonometric function of different frequencies.

[0155] In a selective embodiment, the slope of the first-order linear function changes according to the changes in the bandwidth and roll-off coefficient of the OFDM signal.

[0156] As a selective embodiment, the first-order linear function is determined by the following method. The slope is determined based on the bandwidth and roll-off coefficient of the OFDM modulation symbol, and the slope decreases as the bandwidth and roll-off coefficient increase. Based on the bandwidth, roll-off coefficient, and frequency of the OFDM modulation symbol, the linear function variable is determined. The first-order linear function is determined based on the slope and the linear function variables.

[0157] As an optional embodiment, The phases of the trigonometric functions of different frequencies change according to the change in the roll-off coefficient of the OFDM signal, and / or The amplitude of the trigonometric function increases with increasing number of trigonometric functions.

[0158] As a selective embodiment, the trigonometric functions are determined by the following method. The phase of the trigonometric function is determined based on the roll-off coefficient of the OFDM signal. Based on the bandwidth, roll-off coefficient, and frequency of the OFDM modulation symbol, the trigonometric function variables are determined. The trigonometric function is determined based on the phase and the trigonometric function variables.

[0159] JPEG0007838124000043.jpg84170

[0160] JPEG0007838124000044.jpg21169

[0161] As a selective embodiment, determining the coding matrix corresponding to the OFDM signal by the frequency domain function value corresponding to the OFDM modulation symbol is: The frequency domain function value corresponding to the OFDM modulation symbol is determined as the coding matrix coefficient, This includes determining the coding matrix corresponding to the OFDM signal based on the product of the coding matrix coefficient and the phase factor corresponding to the OFDM modulation symbol.

[0162] As an optional embodiment, The phase factor exhibits an exponential change rule in accordance with the change of the second preset parameter of the OFDM modulation symbol. The second preset parameter includes a target symbol length and an expansion coefficient, the target symbol length being for representing the length of the OFDM modulated symbol after processing by the coding matrix.

[0163] Based on the same idea, embodiments of the present invention further provide a method for determining the inverse coding matrix. As shown in Figure 7, the specific implementation flow of this method is as follows.

[0164] In step 700, the coding matrix is ​​obtained. The coding matrix is ​​determined by the following steps: Determining the frequency of the OFDM modulation symbol obtained by digitally modulating the OFDM signal, The method involves determining a frequency-domain function value corresponding to the frequency of the OFDM modulation symbol based on the frequency-domain function and the frequency of the OFDM modulation symbol, wherein the frequency-domain function is obtained by linearly combining a first-order linear function and trigonometric functions of different frequencies. This includes determining the coding matrix corresponding to the OFDM signal using the frequency domain function value corresponding to the OFDM modulation symbol.

[0165] In step 701, the encoding matrix is ​​inversely processed to determine the inverse encoding matrix.

[0166] Based on the same idea, embodiments of the present invention further provide an OFDM signal transmission method. As shown in Figure 8, the specific implementation flow of the method is as follows.

[0167] In step 800, the frequency of the OFDM modulation symbol obtained by digitally modulating the OFDM signal is determined.

[0168] In step 801, a frequency domain function value corresponding to the frequency of the OFDM modulation symbol is determined based on the frequency domain function and the frequency of the OFDM modulation symbol. The frequency domain function is obtained by linearly combining a first-order linear function with trigonometric functions of different frequencies.

[0169] In step 802, the coding matrix corresponding to the OFDM signal is determined by the frequency domain function value corresponding to the OFDM modulation symbol.

[0170] In step 803, the OFDM signal is processed by the coding matrix corresponding to the OFDM signal to obtain a target OFDM signal that conforms to the rule of change of the frequency domain function.

[0171] In step 804, the target OFDM signal is transmitted.

[0172] Based on the same idea, embodiments of the present invention further provide an OFDM signal receiving method. As shown in Figure 9, the specific implementation flow of the method is as follows.

[0173] In step 900, a target OFDM signal is received, and the target OFDM signal is obtained by processing it with an encoding matrix corresponding to the OFDM signal.

[0174] In step 901, the target OFDM signal is processed by the inverse coding matrix to obtain the OFDM signal, and the inverse coding matrix is ​​obtained by inverse processing the coding matrix corresponding to the OFDM signal.

[0175] Based on the same idea, embodiments of the present invention further provide an OFDM signaling system. As shown in Figure 10, the OFDM signaling system includes a transmitting device 1000 and a receiving device 1001.

[0176] The transmitting device 1000 is for the following purposes: determining the frequency of an OFDM modulation symbol obtained by digitally modulating an OFDM signal; determining a frequency domain function value corresponding to the frequency of the OFDM modulation symbol based on a frequency domain function and the frequency of the OFDM modulation symbol, wherein the frequency domain function is obtained by linearly combining a first-order linear function and trigonometric functions of different frequencies; determining an encoding matrix corresponding to the OFDM signal based on the frequency domain function value corresponding to the OFDM modulation symbol; processing the OFDM signal based on the encoding matrix corresponding to the OFDM signal, obtaining a target OFDM signal that conforms to the rules for changing the frequency domain function, and transmitting the target OFDM signal.

[0177] The receiving device 1001 receives a target OFDM signal, processes the target OFDM signal using an inverse coding matrix, and obtains an OFDM signal. The inverse coding matrix is ​​obtained by inversely processing the coding matrix corresponding to the OFDM signal.

[0178] The devices in this invention include, but are not limited to, transmitting devices and receiving devices. Selectively, the transmitting device may include network equipment and the receiving device may include terminals. Or, the transmitting device may include terminals and the receiving device may include network equipment.

[0179] Based on the same idea, embodiments of the present invention further provide network equipment. Since this network equipment is the network equipment in the method according to embodiments of the present invention, and the principle by which this network equipment solves the problem is similar to that of the method, implementation of this network equipment may refer to implementation of the method, but redundant content will be omitted.

[0180] As shown in Figure 11, the network device includes a processor 1100 and a memory 1101, the memory 1101 for storing programs that can be executed by the processor 1100. The processor 1100 reads the program in the memory 1101, Determining the frequency of the OFDM modulation symbol obtained by digitally modulating the OFDM signal, The method involves determining a frequency-domain function value corresponding to the frequency of the OFDM modulation symbol based on the frequency-domain function and the frequency of the OFDM modulation symbol, wherein the frequency-domain function is obtained by linearly combining a first-order linear function and trigonometric functions of different frequencies. The coding matrix corresponding to the OFDM signal is determined by the frequency domain function value corresponding to the OFDM modulation symbol, The OFDM signal is processed using an encoding matrix corresponding to the OFDM signal, and a target OFDM signal is obtained that conforms to the rule of change of the frequency domain function. This is for the purpose of carrying out [the task].

[0181] As an optional embodiment, the processor 1100 specifically, Based on the bandwidth of the OFDM modulation symbol and a first preset parameter, the start frequency, frequency step value, and end frequency of the OFDM modulation symbol are determined. The frequency of the OFDM modulation symbol is determined based on the start frequency, frequency step value, and end frequency. It is configured to execute.

[0182] In a selective embodiment, the first preset parameter includes a roll-off coefficient, a target symbol length, and a first parameter, the target symbol length being for representing the length of the OFDM modulated symbol after processing by the coding matrix.

[0183] Specifically, the processor 1100 is: Based on the bandwidth, roll-off coefficient, and target symbol length of the OFDM modulation symbol, the start frequency and end frequency are determined. The frequency step value is determined based on the bandwidth, roll-off coefficient, and first parameter of the OFDM modulation symbol. It is configured to execute.

[0184] As an optional embodiment, the processor 1100 specifically, Based on the bandwidth and roll-off coefficient of the OFDM modulation symbol, a first threshold and a second threshold are determined. If the absolute value of the frequency of the OFDM modulation symbol is greater than the first threshold and less than the second threshold, the frequency domain function value corresponding to the frequency of the OFDM modulation symbol is determined based on the frequency domain function and the frequency of the OFDM modulation symbol. It is configured to execute.

[0185] In a selective embodiment, the processor 1100 is specifically configured to determine the frequency domain function in the following manner. The frequency-domain function is obtained by calculating a weighted sum of the linear function and the trigonometric function of different frequencies, according to the respective weights of the linear function and the trigonometric function of different frequencies.

[0186] In a selective embodiment, the slope of the first-order linear function changes according to the changes in the bandwidth and roll-off coefficient of the OFDM signal.

[0187] In a selective embodiment, the processor 1100 is configured to determine the first-order linear function in the following manner. The slope is determined based on the bandwidth and roll-off coefficient of the OFDM modulation symbol, and the slope decreases as the bandwidth and roll-off coefficient increase. Based on the bandwidth, roll-off coefficient, and frequency of the OFDM modulation symbol, the linear function variable is determined. The first-order linear function is determined based on the slope and the linear function variables.

[0188] As an optional embodiment, The phases of the trigonometric functions of different frequencies change according to the change in the roll-off coefficient of the OFDM signal, and / or The amplitude of the trigonometric function increases with increasing number of trigonometric functions.

[0189] In a selective embodiment, the processor 1100 is specifically configured to determine the trigonometric function in the following manner. The phase of the trigonometric function is determined based on the roll-off coefficient of the OFDM signal. Based on the bandwidth, roll-off coefficient, and frequency of the OFDM modulation symbol, the trigonometric function variables are determined. The trigonometric function is determined based on the phase and the trigonometric function variables.

[0190] JPEG0007838124000045.jpg90170

[0191] JPEG0007838124000046.jpg21170

[0192] As an optional embodiment, the processor 1100 specifically, The frequency domain function value corresponding to the OFDM modulation symbol is determined as the coding matrix coefficient, The coding matrix corresponding to the OFDM signal is determined based on the product of the coding matrix coefficient and the phase factor corresponding to the OFDM modulation symbol, It is configured to execute.

[0193] As an optional embodiment, The phase factor exhibits an exponential change rule in accordance with the change of the second preset parameter of the OFDM modulation symbol. The second preset parameter includes a target symbol length and an expansion coefficient. The target symbol length represents the length of the OFDM modulated symbol after processing by the coding matrix.

[0194] As an optional embodiment, the processor 1100 specifically, The OFDM signal is multiplied by the coding matrix corresponding to the OFDM signal to obtain a target OFDM signal that follows the rule of change of the frequency domain function. It is configured to execute.

[0195] Based on the same idea, embodiments of the present invention further provide a terminal. As shown in Figure 12, the terminal includes a processor 1200 and a memory 1201. The memory 1201 is for storing programs that can be executed by the processor 1200. The processor 1200 reads the program in the memory 1201, The process involves receiving a target OFDM signal, wherein the target OFDM signal is obtained by processing it with an encoding matrix corresponding to the OFDM signal. The process involves processing the target OFDM signal using an inverse coding matrix to obtain the OFDM signal, wherein the inverse coding matrix is ​​obtained by inversely processing the coding matrix corresponding to the OFDM signal. This is for the purpose of carrying out [the task].

[0196] Based on the same idea, embodiments of the present invention further provide an OFDM signal processing device. This device is the device in the method according to embodiments of the present invention, and the principle by which this device solves the problem is similar to that of the method. Therefore, the implementation of this device may refer to the implementation of the method, but redundant content will be omitted.

[0197] As shown in Figure 13, the device is A frequency determination module 1300 for determining the frequency of OFDM modulation symbols obtained by digitally modulating an OFDM signal, A frequency domain function module 1301 for determining a frequency domain function value corresponding to the frequency of an OFDM modulation symbol based on a frequency domain function and the frequency of the OFDM modulation symbol, wherein the frequency domain function is obtained by linearly combining a first-order linear function and trigonometric functions of different frequencies. A coding matrix module 1302 for determining the coding matrix corresponding to the OFDM signal based on the frequency domain function value corresponding to the OFDM modulation symbol, The system includes a peak-to-average power ratio reduction module 1303 for processing the OFDM signal using an encoding matrix corresponding to the OFDM signal and obtaining a target OFDM signal that conforms to the rules for changing the frequency domain function.

[0198] As a selective embodiment, the frequency determination module 1300 specifically comprises: Based on the bandwidth of the OFDM modulation symbol and the first preset parameters, the start frequency, frequency step value, and end frequency of the OFDM modulation symbol are determined. Based on the start frequency, frequency step value, and end frequency, the frequency of the OFDM modulation symbol is determined. It is for that purpose.

[0199] In a selective embodiment, the first preset parameter includes a roll-off coefficient, a target symbol length, and a first parameter, the target symbol length being for representing the length of the OFDM modulated symbol after processing by the coding matrix.

[0200] The frequency determination module 1300 specifically, Based on the bandwidth, roll-off coefficient, and target symbol length of the OFDM modulation symbol, the start frequency and end frequency are determined. Based on the bandwidth, roll-off coefficient, and first parameter of the OFDM modulation symbol, the frequency step value is determined. It is for that purpose.

[0201] As a selective embodiment, the frequency domain function module 1301 specifically comprises: Based on the bandwidth and roll-off coefficient of the OFDM modulation symbol, a first threshold and a second threshold are determined. If the absolute value of the frequency of the OFDM modulation symbol is greater than a first threshold and less than a second threshold, the frequency domain function value corresponding to the frequency of the OFDM modulation symbol is determined based on the frequency domain function and the frequency of the OFDM modulation symbol. It is for that purpose.

[0202] In a selective embodiment, the frequency domain function module 1301 specifically determines the frequency domain function in the following manner. The frequency-domain function is obtained by calculating a weighted sum of the linear function and the trigonometric function of different frequencies, according to the respective weights of the linear function and the trigonometric function of different frequencies.

[0203] In a selective embodiment, the slope of the first-order linear function changes according to the changes in the bandwidth and roll-off coefficient of the OFDM signal.

[0204] In a selective embodiment, the frequency domain function module 1301 specifically determines the first-order linear function in the following manner. The slope is determined based on the bandwidth and roll-off coefficient of the OFDM modulation symbol, and the slope decreases as the bandwidth and roll-off coefficient increase. Based on the bandwidth, roll-off coefficient, and frequency of the OFDM modulation symbol, the linear function variable is determined. The first-order linear function is determined based on the slope and the linear function variables.

[0205] As an optional embodiment, The phases of the trigonometric functions of different frequencies change according to the change in the roll-off coefficient of the OFDM signal, and / or The amplitude of the trigonometric function increases with increasing number of trigonometric functions.

[0206] In a selective embodiment, the frequency domain function module 1301 specifically determines the trigonometric functions in the following manner. The phase of the trigonometric function is determined based on the roll-off coefficient of the OFDM signal. Based on the bandwidth, roll-off coefficient, and frequency of the OFDM modulation symbol, the trigonometric function variables are determined. The trigonometric function is determined based on the phase and the trigonometric function variables.

[0207] JPEG0007838124000047.jpg89170

[0208] JPEG0007838124000048.jpg20170

[0209] As an optional embodiment, the coding matrix module 1302 specifically, The frequency domain function value corresponding to the OFDM modulation symbol is determined as the coding matrix coefficient, Based on the product of the coding matrix coefficient and phase factor corresponding to the OFDM modulation symbol, the coding matrix corresponding to the OFDM signal is determined. It is for that purpose.

[0210] As an optional embodiment, The phase factor exhibits an exponential change rule in accordance with the change of the second preset parameter of the OFDM modulation symbol. The second preset parameter includes a target symbol length and an expansion coefficient, the target symbol length being for representing the length of the OFDM modulated symbol after processing by the coding matrix.

[0211] As a selective embodiment, the peak-to-average power ratio reduction module 1303 specifically, The OFDM signal is multiplied by the coding matrix corresponding to the OFDM signal to obtain a target OFDM signal that follows the rule of change of the frequency domain function. It is for that purpose.

[0212] Based on the same idea, embodiments of the present invention provide a computer storage medium. The computer storage medium contains computer program code, and when the computer program code is executed on a computer, it causes the computer to execute one of the OFDM signal processing methods described above. Since the principle by which the above computer storage medium solves the problem is similar to that of the OFDM signal processing method, the implementation of the above computer storage medium may refer to the implementation of the method, but redundant content will be omitted.

[0213] In specific implementations, computer storage media may include various storage media capable of storing program code, such as Universal Serial Bus Flash Drives (USB), portable hard disks, Read-Only Memory (ROM), Random Access Memory (RAM), magnetic disks, or optical disks.

[0214] Based on the same idea, embodiments of the present invention further provide a computer program product. The computer program product includes computer program code, and when the computer program code is executed on a computer, it causes the computer to execute any one of the OFDM signal processing methods described above. Since the principle of solving problems by the above computer program product is similar to the OFDM signal processing method, the implementation of the above computer program product may refer to the implementation of the method, but the overlapping content is omitted.

[0215] The computer program product may use any combination of one or more readable media. The readable media may be a readable signal medium or a readable storage medium. The readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, device, or any combination thereof. More specific examples (non-exhaustive list) of the readable storage medium include an electrical connection having one or more conductors, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0216] Those skilled in the art can understand that embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. And the present invention can take the form of a computer program product executed on one or more computer-usable storage media (including but not limited to disk memory and optical memory, etc.) containing computer-usable program code.

[0217] The present invention will be described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It is understood that computer program instructions realize each flow and / or block in the flowchart and / or block diagram, and combinations of flows and / or blocks in the flowchart and / or block diagram. By providing these computer program instructions to the processor of a general-purpose computer, a dedicated computer, an embedded processor, or other programmable data processing device to generate a machine, instructions executed by the processor of the computer or other programmable data processing device can generate a device for realizing one or more flows in the flowchart and / or one or more blocks in the block diagram.

[0218] These computer program instructions may also be stored in computer-readable memory that can operate a computer or other programmable data processing device in a particular way, and the instructions stored in said computer-readable memory generate a product including an instruction unit, which implements the functions specified by one or more flows in a flowchart and / or one or more blocks in a block diagram.

[0219] These computer program instructions can also be loaded into a computer or other programmable data processing device, causing the computer or other programmable device to execute a series of operational steps to generate processing to be performed by the computer, thereby providing steps for performing the functions specified in one or more flows in a flowchart and / or one or more blocks in a block diagram.

[0220] Clearly, those skilled in the art can make various modifications and variations of the present invention without departing from the spirit and scope of the invention. Thus, if these modifications and variations of the invention fall within the scope of the claims of the invention and the equivalent art, the present invention is intended to include these modifications and variations as well.

Claims

1. OFDM signal processing method, Determining the frequency of the OFDM modulation symbol obtained by digitally modulating the OFDM signal, The method involves determining a frequency domain function value corresponding to the frequency of the OFDM modulation symbol based on the frequency domain function and the frequency of the OFDM modulation symbol, wherein the frequency domain function is obtained by linearly combining a first-order linear function and trigonometric functions of different frequencies. The coding matrix corresponding to the OFDM signal is determined by the frequency domain function value corresponding to the OFDM modulation symbol, The OFDM signal is processed using a coding matrix corresponding to the OFDM signal, and a target OFDM signal is obtained that follows the rule of change of the frequency domain function. Includes, The frequency domain function is expressed by the following equation: Determining the coding matrix corresponding to the OFDM signal by the frequency domain function value corresponding to the OFDM modulation symbol means that The frequency domain function value corresponding to the OFDM modulation symbol is determined as the coding matrix coefficient, The coding matrix corresponding to the OFDM signal is determined based on the product of the coding matrix coefficient and phase factor corresponding to the OFDM modulation symbol, including, Method for processing OFDM signals.

2. Determining the frequency of the OFDM modulation symbol is Based on the bandwidth of the OFDM modulation symbol and a first preset parameter, the start frequency, frequency step value, and end frequency of the OFDM modulation symbol are determined. The frequency of the OFDM modulation symbol is determined based on the start frequency, frequency step value, and end frequency. The OFDM signal processing method according to claim 1, including the method described in claim 1.

3. The first preset parameter includes a roll-off coefficient, a target symbol length, and a first parameter, wherein the target symbol length represents the length of the OFDM modulated symbol after processing by the coding matrix. Determining the start frequency, frequency step value, and end frequency of the OFDM modulation symbol based on the bandwidth of the OFDM modulation symbol and a first preset parameter is: Based on the bandwidth, roll-off coefficient, and target symbol length of the OFDM modulation symbol, the start frequency and end frequency are determined. The frequency step value is determined based on the bandwidth, roll-off coefficient, and first parameter of the OFDM modulation symbol. The OFDM signal processing method according to claim 2, including the method described in claim 2.

4. Determining the frequency domain function value corresponding to the frequency of the OFDM modulation symbol based on the frequency domain function and the frequency of the OFDM modulation symbol is: Based on the bandwidth and roll-off coefficient of the OFDM modulation symbol, a first threshold and a second threshold are determined. If the absolute value of the frequency of the OFDM modulation symbol is greater than a first threshold and less than a second threshold, the frequency domain function value corresponding to the frequency of the OFDM modulation symbol is determined based on the frequency domain function and the frequency of the OFDM modulation symbol. The OFDM signal processing method according to claim 1, including the method described in claim 1.

5. When determining the frequency domain function, The frequency-domain function is determined by calculating a weighted sum of the linear function and the trigonometric function of different frequencies, according to the respective weights of the linear function and the trigonometric function of different frequencies. The OFDM signal processing method according to claim 1.

6. The slope of the aforementioned linear function changes according to the changes in the bandwidth and roll-off coefficient of the OFDM signal. The OFDM signal processing method according to claim 1.

7. When determining the aforementioned linear function, The slope is determined based on the bandwidth and roll-off coefficient of the OFDM modulation symbol, and the slope decreases as the bandwidth and roll-off coefficient increase. Based on the bandwidth, roll-off coefficient, and frequency of the OFDM modulation symbol, the linear function variable is determined. Based on the slope and the linear function variable, the first linear function is determined. The OFDM signal processing method according to claim 1.

8. The phases of the trigonometric functions of different frequencies change according to the change in the roll-off coefficient of the OFDM signal, and / or The amplitude of the trigonometric function increases with increasing number of trigonometric functions. The OFDM signal processing method according to claim 1.

9. When determining the aforementioned trigonometric functions, The phase of the trigonometric function is determined based on the roll-off coefficient of the OFDM signal. Based on the bandwidth, roll-off coefficient, and frequency of the OFDM modulation symbol, the trigonometric function variables are determined. Based on the phase and the trigonometric function variables, the trigonometric function is determined. The OFDM signal processing method according to claim 1.

10. The OFDM signal processing method according to Claim 1.

11. The phase factor exhibits an exponential change rule in accordance with the change of the second preset parameter of the OFDM modulation symbol. The second preset parameter includes a target symbol length and an expansion coefficient, wherein the target symbol length represents the length of the OFDM modulated symbol after processing by the coding matrix. The OFDM signal processing method according to claim 1.

12. Processing the OFDM signal using the coding matrix corresponding to the OFDM signal and obtaining a target OFDM signal that follows the rule of change of the frequency domain function is: This includes multiplying the OFDM signal by the coding matrix corresponding to the OFDM signal to obtain a target OFDM signal that follows the rule of change of the frequency domain function, The OFDM signal processing method according to claim 1.

13. A method for determining the coding matrix, Determining the frequency of the OFDM modulation symbol obtained by digitally modulating the OFDM signal, The method involves determining a frequency domain function value corresponding to the frequency of the OFDM modulation symbol based on the frequency domain function and the frequency of the OFDM modulation symbol, wherein the frequency domain function is obtained by linearly combining a first-order linear function and trigonometric functions of different frequencies. The coding matrix corresponding to the OFDM signal is determined by the frequency domain function value corresponding to the OFDM modulation symbol, Includes, The frequency domain function is expressed by the following equation: Determining the coding matrix corresponding to the OFDM signal by the frequency domain function value corresponding to the OFDM modulation symbol means that The frequency domain function value corresponding to the OFDM modulation symbol is determined as the coding matrix coefficient, The coding matrix corresponding to the OFDM signal is determined based on the product of the coding matrix coefficient and phase factor corresponding to the OFDM modulation symbol, including, Encoding matrix determination method.

14. A method for determining the inverse coding matrix, Obtaining the coding matrix determined by the coding matrix determination method described in claim 13, The coding matrix is ​​reverse-processed to determine the inverse coding matrix, A method for determining the inverse coding matrix, including the method described above.

15. OFDM signal transmission method, Determining a target OFDM signal by the OFDM signal processing method described in any one of claims 1 to 12, Transmitting the aforementioned target OFDM signal, An OFDM signal transmission method, including the above.

16. An OFDM signal receiving method, Receiving a target OFDM signal determined by the OFDM signal processing method described in any one of claims 1 to 12, wherein the target OFDM signal is obtained by processing with an encoding matrix corresponding to an OFDM signal, The process involves processing the target OFDM signal using an inverse coding matrix to obtain the OFDM signal, wherein the inverse coding matrix is ​​obtained by inversely processing the coding matrix corresponding to the OFDM signal. An OFDM signal receiving method, including

17. OFDM signal transmission system, Including transmitting equipment and receiving equipment, The transmitting device determines a target OFDM signal by the OFDM signal processing method described in any one of claims 1 to 12, and transmits the target OFDM signal, wherein the target OFDM signal is obtained by processing with an encoding matrix corresponding to the OFDM signal. The receiving device receives a target OFDM signal, processes the target OFDM signal using an inverse coding matrix, and obtains the OFDM signal. The inverse coding matrix is ​​obtained by inversely processing the coding matrix corresponding to the OFDM signal. OFDM signal transmission system.

18. It is a device, Including the processor and memory, The memory is for storing programs that can be executed by the processor, The processor reads the program in the memory and performs the steps of the OFDM signal processing method described in any one of claims 1 to 12, the coding matrix determination method described in claim 13, or the inverse coding matrix determination method described in claim 14. device.

19. A computer storage medium, A computer program is stored there. When the computer program is executed by the processor, it implements the steps of the OFDM signal processing method described in any one of claims 1 to 12, the coding matrix determination method described in claim 13, or the inverse coding matrix determination method described in claim 14. Computer storage medium.

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