A method, apparatus, and electronic device for suppressing peak-to-average power ratio (PAPR) in OTFS for high-reliability transmission.

Abstract

This invention provides an OTFS peak-to-average power ratio (PAPR) suppression method, apparatus, electronic device, and readable storage medium for high-reliability transmission, applied in the field of wireless communication technology. The method includes: embedding a pilot signal into an OTFS delay-Doppler domain signal frame and setting a guard interval to obtain an initial delay-Doppler domain transmitted signal; performing amplitude-limiting filtering on the transmitted signal to obtain amplitude-limited filtered noise; obtaining approximately iteratively ...

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, and in particular to an OTFS peak-to-average power ratio suppression method, apparatus, and electronic device for high-reliability transmission. Background Technology

[0002] The 6G era faces the challenge of higher-speed mobile communication. In this scenario, Orthogonal Frequency Division Multiplexing (OFDM) modulation, widely used in 4G and 5G communication systems, suffers from performance degradation due to significant Doppler shift. Orthogonal Time Frequency Space (OTFS) modulation technology, proposed in recent years, has garnered widespread attention due to its ability to address this issue. However, as a multi-carrier system, OTFS suffers from an excessively high Peak-to-Average Power Ratio (PAPR), which causes nonlinear distortion when the signal passes through the power amplifier, leading to a deterioration in the system's bit error rate. Therefore, reducing the PAPR of OTFS signals is a crucial issue.

[0003] Existing PAPR suppression methods for OTFS mainly include μ-law companding and iterative amplitude-limiting filtering. However, both methods cause nonlinear distortion of the signal, especially in pilot-embedded OTFS systems. This distortion can also affect the pilot signal, leading to inaccurate subsequent channel estimation and significantly worsening the bit error rate (BER). In practical communication, good transmission reliability often requires a low BER. Therefore, the transmission reliability of the two methods mentioned above is relatively poor. How to achieve good transmission reliability while suppressing PAPR in OTFS signals remains a pressing problem. Summary of the Invention

[0004] The purpose of this invention is to provide an OTFS peak-to-average power ratio (PAPR) suppression method, apparatus, electronic device, and readable storage medium for high-reliability transmission, so as to achieve PAPR suppression of OTFS signals while maintaining good system transmission reliability. Assume the OTFS system has M delay grids and N Doppler grids.

[0005] The specific technical solution is as follows:

[0006] In a first aspect, embodiments of the present invention provide an OTFS peak-to-average power ratio (PAPR) suppression method for high-reliability transmission, the method comprising:

[0007] Step S101: Embed pilot signals in the OTFS time-delay-Doppler domain signal frame and set guard intervals to obtain the initial time-delay-Doppler domain transmission signal x[m,n], and obtain the time-domain transmission signal s(t) through symplectic finite Fourier inverse transform and Heisenberg transform; preset the system target peak-to-average power ratio level and the maximum number of method iterations according to actual requirements;

[0008] Step S102: Based on the system's target peak-to-average power ratio (PAPR), a limiting function is created to limit s(t), and then filtered in the time-delay-Doppler domain using a filtering function to obtain the limited filtering noise d. f [m,n];

[0009] Step S103: Calculate the simulated noise figure to obtain the noise after approximately multiple iterations of amplitude limiting filtering. The time-delay-Doppler domain signal after multiple iterations of amplitude-limiting filtering was simulated using this noise calculation.

[0010] Step S104: Eliminate the influence of the above processing on the pilot based on the pilot embedding position, and update the time-delay-Doppler domain transmitted signal after this method iteration, denoted as... And increment the iteration count by 1;

[0011] Step S105: Determine if the method has reached the maximum number of iterations. If it has, then use the result obtained in step S104. Transform to the time domain for transmission; otherwise, ... Continue signal processing.

[0012] Secondly, an OTFS peak-to-average power ratio (PAPR) suppression device for high-reliability transmission, the device comprising:

[0013] The parameter acquisition module is used to obtain the limiting threshold based on the target peak-to-average ratio suppression level, obtain the simulated noise figure based on the number of simulated iterative limiting filters, and obtain the coordinate parameters of the pilot embedding position and the preset maximum number of method iterations.

[0014] The function creation module is used to create the amplitude limiting function and the filtering function using the acquired parameters;

[0015] The signal processing module is used to input the raw data in the time-delay-Doppler domain into the limiting function and the filtering function for signal processing; and to use the simulated noise figure to obtain the noise after approximately multiple iterations of limiting and filtering, and update the transmitted signal in the time-delay-Doppler domain.

[0016] The iterative processing module determines the subsequent signal processing operations based on the specific number of iterations.

[0017] Thirdly, an electronic device, characterized in that it comprises: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus;

[0018] The memory is used to store computer programs;

[0019] When the processor executes the program stored in the memory, it implements the steps of any of the above-described OTFS peak-to-average power ratio suppression methods for high-reliability transmission.

[0020] Fourthly, a computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the OTFS peak-to-average power ratio suppression method for high-reliability transmission described above.

[0021] Beneficial effects of the embodiments of the present invention:

[0022] In the technical solution provided by this invention, the influence of signal processing on the pilot signal is eliminated after each method iteration, thereby ensuring the accuracy of channel estimation at the subsequent receiver and greatly improving the system's BER performance. In other words, the technical solution achieves good transmission reliability. Furthermore, the technical solution filters noise signals, thus suppressing out-of-band radiation to a certain extent, resulting in good PSD performance. Of course, implementing any product or method of this invention does not necessarily require simultaneously achieving all the advantages described above. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A flowchart illustrating an OTFS peak-to-average power ratio (PAPR) suppression method for high-reliability transmission provided in an embodiment of the present invention;

[0025] Figure 2 The overall flowchart of an OTFS peak-to-average power ratio suppression method for high-reliability transmission provided in an embodiment of the present invention is shown below.

[0026] Figure 3 This is a schematic diagram of the structure of an OTFS peak-to-average power ratio suppression device for high-reliability transmission provided in an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] This invention provides an OTFS peak-to-average power ratio (PAPR) suppression method for high-reliability transmission. This method can be applied to electronic devices that transmit or process signals to process the original OTFS signal, achieving PAPR suppression while maintaining good transmission reliability. In specific applications, the aforementioned electronic devices can be desktop computers, portable computers, mobile terminals, wearable devices, servers, and other similar devices.

[0030] Figure 1 This is a flowchart illustrating an OTFS peak-to-average power ratio (PAPR) suppression method for high-reliability transmission provided in an embodiment of the present invention. Figure 2 To and Figure 1 The corresponding overall flowchart includes the following steps:

[0031] Step S101: Embed pilot signals in the OTFS time-delay-Doppler domain signal frame and set guard intervals to obtain the initial time-delay-Doppler domain transmission signal x[m,n], and obtain the time-domain transmission signal s(t) through symplectic finite Fourier inverse transform and Heisenberg transform; preset the system target peak-to-average power ratio level and the maximum number of method iterations according to actual requirements.

[0032] In practical applications, assuming the OTFS system has M delay grids and N Doppler grids, the embedding position of the pilot signal and the setting of the guard interval can be expressed by the following formula.

[0033]

[0034] Wherein, m and n satisfy m = 0, ..., M-1, n = 0, ..., N-1, and m p ,n p The pilot embedding position satisfies 0≤np≤N-1, 0≤mp≤M-1. The area that carries data signals, For protection intervals.

[0035] Step S102: Based on the system's target peak-to-average power ratio (PAPR), a limiting function is created to limit s(t), and then filtered in the time-delay-Doppler domain using a filtering function to obtain the limited filtering noise d. f [m,n];

[0036] Specifically, the steps include the following:

[0037] First, a limiting function is created based on the system's target peak-to-average power ratio (PAPR) level to limit s(t);

[0038] The limiting function can be expressed as follows:

[0039]

[0040] A is the amplitude limiting threshold, which can be calculated based on the system's target peak-to-average power ratio. φ(t) is the signal phase, and s'(t) is the amplitude-limited signal.

[0041] Then, filtering is performed in the time-delay-Doppler domain according to the filtering function;

[0042] The filtering function can be expressed as follows:

[0043]

[0044] The d[m,n] is the time-delay-Doppler domain clipping noise, obtained by subtracting s'(t) from s(t) and transforming it to the time-delay-Doppler domain. The m is the region in the time-delay-Doppler domain filled with the data signal. p and n p The location in the time-delay-Doppler domain where the pilot signal is filled is defined as the location where the data signal and the pilot signal are filled. The d... f [m,n] represents the noise signal after one amplitude limiting filter.

[0045] Step S103: Calculate the simulated noise figure to obtain the noise after approximately multiple iterations of amplitude limiting filtering. The time-delay-Doppler domain signal after multiple iterations of amplitude-limiting filtering was simulated using this noise calculation.

[0046] Specifically, the steps include the following:

[0047] First, the noise after approximately multiple iterations of amplitude limiting filtering is obtained based on the simulated noise figure.

[0048] The simulated noise figure is calculated by the following formula.

[0049]

[0050] A represents the amplitude limit value obtained from the target peak-to-average power ratio, σ is the standard deviation of the complex Gaussian process, k is the number of simulation iterations, and α is a calculation intermediate quantity.

[0051] The noise after the approximate multiple iterations of amplitude limiting filtering It can be represented as

[0052]

[0053] Wherein, the d f [m,n] represents the noise signal after one amplitude limiting filter, and β represents the analog noise figure.

[0054] Subsequently, the time-delay-Doppler signal after multiple iterations of amplitude-limiting filtering was obtained through noise calculation. It can be represented as

[0055]

[0056] Step S104: Eliminate the influence of the above processing on the pilot based on the pilot embedding position, and update the time-delay-Doppler domain transmitted signal after this method iteration, denoted as... Then increment the iteration count by 1.

[0057] Specifically, eliminating the influence of the above processing on the pilot based on the position of the pilot embedding can be described as restoring the signal at the pilot embedding position to the initial pilot signal.

[0058] The time-delay-Doppler domain transmitted signal updated after this method iteration can be expressed by the following formula.

[0059]

[0060] The m p and n p The x represents the location in the time-delay-Doppler domain where the pilot signal is filled, and the x represents the region other than the data signal and the pilot signal. p This is the initial pilot signal.

[0061] Step S105: Determine if the method has reached the maximum number of iterations. If it has, then use the result obtained in step S104. Transform to the time domain for transmission; otherwise, ... Continue signal processing.

[0062] Beneficial effects of the embodiments of the present invention:

[0063] In the technical solution provided by this invention, the influence of signal processing on the pilot signal is eliminated after each method iteration, thereby ensuring the accuracy of channel estimation at the subsequent receiver and greatly improving the system's BER performance. In other words, the technical solution achieves good transmission reliability. Furthermore, the technical solution filters noise signals, thus suppressing out-of-band radiation to a certain extent, resulting in good PSD performance. Of course, implementing any product or method of this invention does not necessarily require simultaneously achieving all the advantages described above.

[0064] Corresponding to the above method embodiments, this invention also provides an OTFS peak-to-average power ratio suppression device for high-reliability transmission.

[0065] Figure 3 A structural diagram of an OTFS peak-to-average power ratio (PAPR) suppression device for high-reliability transmission provided in an embodiment of the present invention includes:

[0066] The parameter acquisition module 401 is used to acquire the limiting threshold based on the target peak-to-average ratio suppression level, acquire the simulated noise figure based on the number of simulated iterative limiting filters, and acquire the coordinate parameters of the pilot embedding position and the preset maximum number of method iterations.

[0067] The simulated noise figure is calculated by the following formula.

[0068]

[0069] A represents the amplitude limiting threshold obtained from the target peak-to-average power ratio, σ is the standard deviation of the complex Gaussian process, k is the number of simulation iterations, and α is a calculation intermediate quantity.

[0070] The function creation module 402 is used to create the amplitude limiting function and the filtering function using the acquired parameters;

[0071] This module specifically includes:

[0072] The limiting function is created using the limiting threshold obtained from the parameter acquisition module;

[0073] The limiting function can be expressed as follows:

[0074]

[0075] A is the amplitude limiting threshold, which can be calculated based on the system's target peak-to-average power ratio. φ(t) is the signal phase, and s'(t) is the amplitude-limited signal.

[0076] The filtering function is created using the coordinate parameters of the pilot embedding position obtained by the parameter acquisition module;

[0077] The filtering function can be expressed as follows:

[0078]

[0079] The d[m,n] represents the time-delay-Doppler domain clipping noise. The m represents the region in the initial time-delay-Doppler domain filled with the data signal. p and n p The location of the pilot signal filling in the initial time-delay-Doppler domain, where "otherwise" refers to the region other than the region filled with data signal and pilot signal, and the d... f [m,n] represents the noise signal after one amplitude limiting filter.

[0080] Signal processing module 403 is used to input the raw data of the time delay-Doppler domain into the amplitude limiting function and the filtering function for signal processing; and to use the simulated noise figure to obtain the noise after approximately multiple iterations of amplitude limiting and filtering, and update the transmitted signal in the time delay-Doppler domain.

[0081] Among them, the noise after approximately multiple iterations of amplitude limiting filtering It can be represented as

[0082]

[0083] β is the analog noise figure, and d f [m,n] represents the time-delay-Doppler domain noise after one amplitude-limiting filter.

[0084] The time-delay-Doppler signal after multiple iterations of amplitude-limiting filtering was obtained through this noise calculation. It can be represented as

[0085]

[0086] The iterative processing module 404 determines the subsequent signal processing operations based on the specific number of iterations.

[0087] This module can be specifically described as:

[0088] If the method has reached the maximum number of iterations, the time-delay-Doppler signal updated by the method iterations is transformed into the time domain for transmission; otherwise, the time-delay-Doppler signal continues to be processed.

[0089] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0090] This invention also provides an electronic device. Figure 4The electronic device according to an embodiment of the present invention includes: a processor 501, a communication interface 502, a memory 503, and a communication bus 504, wherein the processor 501, the communication interface 502, and the memory 503 communicate with each other through the communication bus 504;

[0091] Memory 503 is used to store computer programs;

[0092] When the processor 501 executes the program stored in the memory 503, it implements the steps of any of the above-mentioned OTFS peak-to-average ratio suppression methods for high-reliability transmission.

[0093] The communication bus mentioned in the above electronic devices can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. This communication bus can be divided into address bus, data bus, control bus, etc. For ease of illustration, only one thick line is used to represent it in the diagram, but this does not mean that there is only one bus or one type of bus.

[0094] The communication interface is used for communication between the aforementioned electronic devices and other devices.

[0095] The memory may include random access memory (RAM) or non-volatile memory (NVM), such as at least one disk storage device. Optionally, the memory may also be at least one storage device located remotely from the aforementioned processor.

[0096] The processors mentioned above can be general-purpose processors, including central processing units (CPUs), network processors (NPs), etc.; they can also be digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0097] The present invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of any of the above-described OTFS peak-to-average power ratio suppression methods for high-reliability transmission.

[0098] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present invention are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid state disk (SSD)).

[0099] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0100] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the device and electronic device embodiments are basically similar to the method embodiments, so the descriptions are relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0101] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A peak-to-average power ratio (PAPR) suppression method for OTFS (Optical Time-of-Flight) transmission with high reliability, characterized in that, The method includes: Step S101: Embed pilot signals in the OTFS time-delay-Doppler domain signal frame and set guard intervals to obtain the initial time-delay-Doppler domain transmission signal x[m,n], and obtain the time-domain transmission signal s(t) through symplectic finite Fourier inverse transform and Heisenberg transform; preset the system target peak-to-average power ratio level and maximum number of iterations according to actual requirements; Step S102: Based on the system's target peak-to-average power ratio (PAPR), a limiting function is created to limit s(t), and then filtered in the time-delay-Doppler domain using a filtering function to obtain the limited filtering noise d. f [m,n]; Step S103: Calculate the simulated noise figure to obtain the noise after multiple iterations of amplitude-limiting filtering. The time-delay-Doppler domain signal after multiple iterations of amplitude-limiting filtering was simulated using this noise calculation. Step S104: Eliminate the influence of pilot signal processing on pilot signal based on pilot embedding position, and update the time-delay-Doppler domain transmitted signal after this iteration, denoted as... And increment the iteration count by 1; Step S105: Determine if the maximum number of iterations has been reached. If it has been reached, then use the result obtained in step S104. Transform to the time domain for transmission; otherwise... Continue signal processing; In step S101, a pilot signal is embedded in the OTFS delay-Doppler domain signal frame and a guard interval is set to obtain the initial delay-Doppler domain transmission signal x[m,n], including: Assuming the OTFS system has M delay grids and N Doppler grids, the embedding position and guard interval of the pilot signal can be expressed by the following formula. Wherein, m and n satisfy m = 0, ..., M-1, n = 0, ..., N-1, and m p ,n p The pilot embedding position satisfies 0 ≤ n p ≤N-1,0≤m p ≤M-1, the The area that carries data signals, For protection intervals; In step S103, the simulated noise figure is calculated to obtain the noise after multiple iterations of amplitude limiting filtering. The time-delay-Doppler domain signal after multiple iterations of amplitude-limiting filtering was simulated using this noise calculation. include: Calculate the simulated noise figure to obtain the noise after multiple iterations of amplitude-limiting filtering. The simulated noise figure is calculated by the following formula. A represents the amplitude limiting threshold obtained from the target peak-to-average power ratio, σ is the standard deviation of the complex Gaussian process, k is the number of simulation iterations, and α is a calculation intermediate quantity; The noise after multiple iterations of amplitude limiting filtering It can be represented as Wherein, the d f [m,n] represents the noise signal after one amplitude limiting filter, where β is the analog noise figure; The time-delay-Doppler signal after multiple iterations of amplitude-limiting filtering was obtained through this noise calculation. It can be represented as In step S104, the influence of pilot signal processing on the pilot signal is eliminated based on the pilot embedding position, and the time-delay-Doppler domain transmission signal after this method iteration is updated, including: Eliminating the influence of pilots on the pilots during signal processing based on the pilot embedding location can be specifically described as restoring the signal at the pilot embedding location to the initial pilot signal; The time-delay-Doppler domain transmitted signal updated after this method iteration can be expressed by the following formula. The m p and n p The x represents the location in the time-delay-Doppler domain where the pilot signal is filled, and the x represents the region other than the data signal and the pilot signal. p This is the initial pilot signal.

2. The method according to claim 1, characterized in that, During signal processing, a limiting function is created based on the system's target peak-to-average power ratio (PAPR) to limit s(t), and filtering is performed in the time-delay-Doppler domain using a filtering function, including: A limiting function is created based on the system's target peak-to-average power ratio (PAPR) level to limit the amplitude of s(t). The limiting function can be expressed as follows: A is the amplitude limiting threshold, which can be calculated based on the system's target peak-to-average power ratio. φ(t) is the signal phase, and s'(t) is the amplitude-limited signal. Filtering is performed in the time-delay-Doppler domain according to the filtering function; The filtering function can be expressed as follows: The d[m,n] is the time-delay-Doppler domain clipping noise, obtained by subtracting s'(t) from s(t) and transforming it to the time-delay-Doppler domain. The m is the region in the time-delay-Doppler domain filled with the data signal. p and n p The location in the time-delay-Doppler domain where the pilot signal is filled is defined as the location where the data signal and the pilot signal are filled. The d... f [m,n] represents the noise signal after one amplitude limiting filter.

3. An OTFS peak-to-average power ratio (PAPR) suppression device for high-reliability transmission, used to perform the method described in any one of claims 1-2: The parameter acquisition module is used to obtain the limiting threshold based on the target peak-to-average ratio suppression level, obtain the simulated noise figure based on the number of simulated iterative limiting filters, and obtain the coordinate parameters of the pilot embedding position and the preset maximum number of iterations. The function creation module is used to create limiting and filtering functions using the acquired parameters; The signal processing module is used to input the raw data in the time-delay-Doppler domain into the limiting function and the filtering function for signal processing; The noise after multiple iterations of amplitude limiting filtering is obtained using the simulated noise figure, and the time-delay-Doppler domain transmitted signal is updated. The iterative processing module determines the subsequent signal processing operations based on the specific number of iterations.

4. An electronic device, characterized in that, include: The system includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus. The memory is used to store computer programs; When the processor executes the program stored in the memory, it implements the steps of the OTFS peak-to-average power ratio suppression method for high-reliability transmission as described in any one of claims 1 to 2.

5. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the OTFS peak-to-average power ratio suppression method for high-reliability transmission as described in any one of claims 1 to 2.

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