Method for reducing peak-to-average ratio of wi-fi signal, electronic device and storage medium

Abstract

Embodiments of the present application relate to the field of signal processing, and disclose a method for reducing peak-to-average ratio of Wi-Fi signal, an electronic device and a storage medium, wherein the method comprises: interpolating a to-be-transmitted Wi-Fi signal to expand the out-of-band signal bandwidth of the Wi-Fi signal and increase the sampling frequency; adding noise in the out-of-band signal of the Wi-Fi signal after the bandwidth is expanded, and the Wi-Fi signal after the noise is added meets the preset spectrum template requirement. The scheme can reduce the peak-to-average ratio of the Wi-Fi signal, so that the power amplifier works better in the linear region and is not easy to enter the saturation state, thereby avoiding possible signal peak distortion, reducing the increase of signal spectrum expansion, energy leakage and out-of-band interference.

Description

Technical Field

[0001] This invention relates to the field of signal processing, and in particular to a method, electronic device, and storage medium for reducing the peak-to-average power ratio of Wi-Fi signals. Background Technology

[0002] Wi-Fi, short for Wireless Fidelity, is a wireless network communication technology that allows personal computers, handheld devices (such as PDAs and mobile phones) to connect to each other wirelessly. The main advantage of Wi-Fi is that it eliminates the need for wiring, freeing users from the limitations of wired connections. Simply connect a wireless router to convert wired signals into wireless Wi-Fi signals.

[0003] Wireless signals, observed in the time domain, are sinusoidal waves with constantly varying amplitudes. The peak amplitude of a signal within one cycle differs from that in other cycles, resulting in different average and peak power for each cycle. Over a relatively long period, the peak power represents the maximum transient power with a certain probability, typically 0.01%. The ratio of the peak power with this probability to the total average power of the system is called the peak-to-average power ratio (PAPR).

[0004] Since Wi-Fi signals belong to the orthogonal frequency division multiplexing (OFDM) system, which has a high peak-to-average power ratio (PAPR), Wi-Fi signals with a high PAPR are very likely to enter the nonlinear region of the power amplifier, causing nonlinear distortion of the signal, resulting in significant spectrum spread interference and in-band signal distortion, which leads to a serious deterioration in the performance of the entire system. Summary of the Invention

[0005] The purpose of this invention is to provide a method, electronic device, and storage medium for reducing the peak-to-average power ratio (PAPR) of Wi-Fi signals. This reduces the PAPR of Wi-Fi signals, allowing power amplifiers to operate better in the linear region and less likely to enter saturation, thereby avoiding potential signal peak distortion and reducing signal spectral spread, energy leakage, and increased out-of-band interference.

[0006] To address the aforementioned technical problems, embodiments of the present invention provide a method for reducing the peak-to-average power ratio (PAPR) of Wi-Fi signals, comprising:

[0007] Interpolate the Wi-Fi signal to be transmitted to expand the out-of-band bandwidth of the Wi-Fi signal and increase the sampling frequency;

[0008] Noise is added to the out-of-band signal of the Wi-Fi signal after the bandwidth is expanded, and the Wi-Fi signal with added noise meets the preset spectrum template requirements.

[0009] Embodiments of the present invention also provide an electronic device, comprising:

[0010] At least one processor; and,

[0011] A memory communicatively connected to the at least one processor; wherein,

[0012] The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the method for reducing the peak-to-average power ratio of Wi-Fi signals as described above.

[0013] Embodiments of the present invention also provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the reduction method as described above.

[0014] Compared to existing technologies, this invention uses an interpolation filter to interpolate the Wi-Fi signal to be transmitted, thereby expanding the out-of-band bandwidth of the Wi-Fi signal and increasing the sampling frequency. Subsequently, noise is added to the out-of-band signal after the bandwidth expansion, ensuring the noise-added Wi-Fi signal meets preset spectral template requirements. In other words, by adding noise to the out-of-band signal without altering the effective in-band signal, the peak-to-average power ratio (PAPR) of the Wi-Fi signal is effectively reduced. This allows the power amplifier to operate better in the linear region and is less prone to saturation, avoiding potential signal peak distortion and reducing spectral spread, energy leakage, and increased out-of-band interference. Attached Figure Description

[0015] Figure 1 This is a detailed flowchart of a method for reducing the peak-to-average power ratio of Wi-Fi signals according to an embodiment of the present invention. Figure 1 ;

[0016] Figure 2 It is a spectrum template diagram according to an embodiment of the present invention;

[0017] Figure 3 This is a detailed flowchart of a method for reducing the peak-to-average power ratio of Wi-Fi signals according to an embodiment of the present invention. Figure 2 ;

[0018] Figure 4 This is a detailed flowchart of a method for reducing the peak-to-average power ratio of Wi-Fi signals according to an embodiment of the present invention. Figure 3 ;

[0019] Figure 5 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented in the various embodiments of the present invention to enable the reader to better understand this application. However, the technical solutions claimed in this application can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0021] One embodiment of the present invention relates to a method for reducing the peak-to-average power ratio (PAPR) of Wi-Fi signals, such as... Figure 1 As shown in the figure, this embodiment provides a method for reducing the peak-to-average power ratio of Wi-Fi signals, which includes the following steps.

[0022] Step 101: Interpolate the Wi-Fi signal to be transmitted to expand the out-of-band bandwidth of the Wi-Fi signal and increase the sampling frequency.

[0023] Interpolation involves inserting corresponding values ​​between points in a discrete signal. However, since we don't know the exact value of a continuous signal at a given point, interpolation typically inserts zero values. If the original signal is x(n), inserting L zero values ​​between adjacent points results in x(n / L), which is equivalent to extending the signal by a factor of L in the time domain. Similarly, the signal in the frequency domain will be compressed to 1 / L of its original value. Simultaneously, the spectrum is extended with a period of 2pai / L. Specifically, when the Wi-Fi signal rate equals one times the bandwidth, interpolation filtering is necessary; when the Wi-Fi signal rate is greater than one times the bandwidth, interpolation is optional. The higher the interpolated rate, the greater the resource consumption, thus requiring a balance between interpolation and resource consumption. For a channel, the frequency band is the range between the highest and lowest frequencies of the allowed signal transmission. Most of the energy in a signal is concentrated within a relatively narrow frequency band. This band where most of the signal's energy is concentrated is called the effective bandwidth. Signals within the effective bandwidth are called "in-band signals," and signals outside the effective bandwidth are called "out-of-band signals."

[0024] Specifically, the Wi-Fi signal to be transmitted is interpolated by an interpolation filter. Since the signal is extended by a factor of L in the time domain and compressed to 1 / L in the frequency domain after interpolation, the out-of-band bandwidth of the interpolated Wi-Fi signal is expanded and the sampling frequency is increased.

[0025] Step 102: Add noise to the out-of-band signal of the Wi-Fi signal after the bandwidth is expanded, and the Wi-Fi signal after adding noise meets the preset spectrum template requirements.

[0026] In this context, the spectrum, short for frequency spectral density, is the distribution curve of frequencies. Complex oscillations are decomposed into harmonic oscillations with different amplitudes and frequencies; the graph of these harmonic oscillations arranged by frequency is called the spectrum. The IEEE 802.11 standard specifies a spectrum template, defining the allowed power distribution in each channel. The spectrum template requires the signal to attenuate to a specific level (from peak amplitude) with a specified frequency offset. IEEE 802.11 is the commonly used standard for wireless local area networks (WLANs) today; it is a wireless network communication standard defined by the Institute of Electrical and Electronics Engineers (IEEE). This means that even Wi-Fi signals with added noise in out-of-band signals must meet the requirements of the spectrum template.

[0027] Specifically, noise is added to the out-of-band signal of the Wi-Fi signal after the bandwidth is expanded. Since the spectrum template requires the signal to attenuate to a specific level (from the peak amplitude) with a specified frequency offset, the Wi-Fi signal with added noise also needs to meet the requirements of the preset spectrum template. Furthermore, the noise added out of band is designed for the bandwidth of the Wi-Fi signal to be transmitted and can reduce the peak-to-average power ratio.

[0028] Taking HE 160M as an example, the spectrum template required by the Wi-Fi protocol is as follows: Figure 2 As shown in the diagram. The signals in segments AB and EF are out-of-band signal regions, while segment CD is the in-band signal region. The corresponding Wi-Fi signals must meet the requirements of this template and cannot exceed the signal attenuation trend to a specific level with a specified frequency offset as required by the spectrum template.

[0029] It is important to note that Figure 2 The spectrum templates in this application are merely illustrative examples for ease of understanding and do not constitute any limitation on the spectrum templates used in this application. The specific spectrum template used in actual applications is determined based on the specific transmission scenario of the Wi-Fi signal.

[0030] Compared with related technologies, this embodiment interpolates the Wi-Fi signal to be transmitted using an interpolation filter, thereby expanding the out-of-band bandwidth of the Wi-Fi signal and increasing the sampling frequency. Subsequently, noise is added to the out-of-band signal after the bandwidth expansion, ensuring the noise-added Wi-Fi signal meets preset spectral template requirements. That is, without altering the effective in-band signal, noise is added to the out-of-band signal, effectively reducing the peak-to-average power ratio (PAPR) of the Wi-Fi signal. This allows the power amplifier to operate better in the linear region and is less prone to saturation, avoiding potential signal peak distortion, reducing spectral spread, energy leakage, and out-of-band interference, and minimizing EVM damage to the in-band signal.

[0031] Another embodiment of the present invention relates to a method for reducing the peak-to-average power ratio of Wi-Fi signals, such as... Figure 3 As shown, before performing step 101, the following steps are also included.

[0032] Step 100: Perform shaping filtering on the Wi-Fi signal to be transmitted to reduce out-of-band noise of the Wi-Fi signal.

[0033] Specifically, before interpolating the Wi-Fi signal to be transmitted, a shaping filter is first applied to the Wi-Fi signal to reduce its original out-of-band noise. It's important to note that the original out-of-band noise is different from the noise added in step 102. The original out-of-band noise of the Wi-Fi signal is random noise other than the target signal, while the added out-of-band noise is designed specifically for the bandwidth of the Wi-Fi signal to be transmitted, reducing the peak-to-average power ratio (PAPR).

[0034] After the Wi-Fi signal to be transmitted is shaped and filtered, step 101 is executed: interpolation is performed on the Wi-Fi signal to be transmitted to expand the out-of-band signal bandwidth of the Wi-Fi signal and increase the sampling frequency.

[0035] In one example, interpolation of the Wi-Fi signal to be transmitted can be performed by using an interpolation filter to interpolate the in-band signal of the Wi-Fi signal to be transmitted.

[0036] Specifically, by interpolating the in-band signal of the Wi-Fi signal, the interpolated Wi-Fi signal is extended by a factor of L in the time domain and compressed to 1 / L of the original in the frequency domain. Thus, the out-of-band signal bandwidth of the interpolated Wi-Fi signal is expanded and the sampling frequency is increased.

[0037] In one example, the out-of-band width of the Wi-Fi signal after bandwidth expansion is less than a first preset width and / or the increased sampling frequency is less than a first preset frequency.

[0038] Specifically, interpolating Wi-Fi signals can expand their out-of-band bandwidth. A higher interpolation factor and sampling frequency mean a larger out-of-band bandwidth, allowing for the addition of more noise. However, interpolation itself consumes resources, and the increased noise further increases the resource requirements for rapidly reducing the peak-to-average ratio (PAPR). To balance resources and performance, the interpolation factor needs to be limited; that is, the out-of-band bandwidth of the expanded Wi-Fi signal must be less than a first preset width and / or the increased sampling frequency must be less than a first preset frequency. It should be noted that this embodiment does not impose specific limitations on the first preset width and the first preset frequency. These can be determined based on actual application conditions, resource consumption, and computational speed, as long as a relative balance between resources and performance is achieved.

[0039] Step 102 is the same as the aforementioned implementation method, and will not be repeated here.

[0040] Compared with related technologies, the embodiments of the present invention perform shaping filtering on the Wi-Fi signal to be transmitted before interpolation, ensuring that there is no interference from other symbols at the sampling time of the symbols, thus limiting the spectrum of the Wi-Fi signal to match the channel bandwidth range, thereby reducing the original out-of-band noise in the frequency band of the currently transmitted Wi-Fi signal. By limiting the width of the out-of-band signal of the Wi-Fi signal after bandwidth expansion to less than a first preset width and / or the increased sampling frequency to less than a first preset frequency, this embodiment can achieve a relative balance between resources and performance.

[0041] Another embodiment of the present invention relates to a method for reducing the peak-to-average power ratio (PAPR) of Wi-Fi signals, such as... Figure 4 As shown, step 102 can be replaced by step 200. That is, when performing step 102, the following steps can also be performed simultaneously: adding noise to the in-band signal of the Wi-Fi signal, and the Wi-Fi signal after adding noise meets the preset spectrum template requirements.

[0042] Step 200: Add noise to the out-of-band signal of the Wi-Fi signal after the bandwidth is expanded, and the Wi-Fi signal after adding noise meets the preset spectrum template requirements;

[0043] Noise is added to the in-band signal of the Wi-Fi signal, and the Wi-Fi signal after adding noise meets the preset spectrum template requirements.

[0044] Specifically, in this embodiment, while adding noise to the out-of-band signal of the Wi-Fi signal with expanded bandwidth, noise can also be added to the in-band signal of the Wi-Fi signal simultaneously, achieving simultaneous noise addition to both the in-band and out-of-band signals. Furthermore, after simultaneously adding noise to both the in-band and out-of-band signals, the Wi-Fi signal must still meet the preset spectrum template requirements. Moreover, the magnitude of the noise added to the out-of-band and in-band signals of the Wi-Fi signal with expanded bandwidth can be the same or different.

[0045] In one example, the amount of noise added to both the out-of-band and in-band signals of the Wi-Fi signal after the bandwidth has been increased needs to be the same.

[0046] Specifically, according to the definition of peak-to-average power ratio (PAPR): the ratio of the square of the maximum value of the transmitted signal (voltage or current) to the average value of the square of the signal, it can be seen that by adding noise of the same magnitude to both the out-of-band and in-band signals of the Wi-Fi signal after the bandwidth is expanded, the peak value of the Wi-Fi signal can be relatively reduced (relative to the out-of-band signal), thereby achieving the purpose of reducing the PAPR.

[0047] In another example, the amount of noise added to the out-of-band and in-band signals of the Wi-Fi signal after the bandwidth is extended is different, and the noise added to the out-of-band signal is greater than the noise added to the in-band signal.

[0048] Specifically, by adding noise of the same magnitude to both the out-of-band and in-band signals of the Wi-Fi signal after the bandwidth is expanded, if we want to reduce the peak-to-average power ratio of the Wi-Fi signal, we need to reduce the difference in magnitude between the Wi-Fi signals, that is, the noise added to the out-of-band signal should be greater than the noise added to the in-band signal, so that the peak value of the Wi-Fi signal is relatively reduced.

[0049] In one example, the noise to be added to the Wi-Fi signal after the bandwidth is extended is obtained through signal simulation. The simulation constraints can be: the Wi-Fi signal after adding noise meets the preset spectrum template requirements and the preset error phase amplitude index.

[0050] Specifically, the Wi-Fi signal still satisfies the spectrum template after noise is added because the magnitude of the added noise is pre-obtained through signal simulation. By setting two constraints—meeting the preset spectrum template requirements and the preset error phase amplitude index—the maximum amount of noise to be added to the in-band and out-of-band signals of the Wi-Fi signal is calculated and used as the output of the signal simulation. This result is then used to add noise to the in-band and out-of-band signals of the Wi-Fi signal.

[0051] Compared to related technologies, this embodiment adds noise to both the out-of-band and in-band signals of the Wi-Fi signal after bandwidth expansion, allowing for more diverse options for reducing peak-to-average power ratio (PAPR). Furthermore, by calculating the maximum noise added to both the in-band and out-of-band signals of the Wi-Fi signal through signal simulation, and considering the magnitude relationship between the added noise in the out-of-band and in-band signals of the expanded bandwidth Wi-Fi signal, the added noise can be controlled more precisely, maximizing the reduction of PAPR of the Wi-Fi signal.

[0052] Another embodiment of the present invention relates to an electronic device, such as Figure 5 As shown, it includes at least one processor 202; and a memory 201 communicatively connected to at least one processor 202; wherein the memory 201 stores instructions executable by at least one processor 202, the instructions being executed by at least one processor 202 to enable at least one processor 202 to execute any of the above method embodiments.

[0053] The memory 201 and processor 202 are connected via a bus, which can include any number of interconnecting buses and bridges. The bus connects various circuits of one or more processors 202 and memory 201 together. The bus can also connect various other circuits, such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. A bus interface provides an interface between the bus and the transceiver. The transceiver can be a single element or multiple elements, such as multiple receivers and transmitters, providing a unit for communicating with various other devices over a transmission medium. Data processed by processor 202 is transmitted over a wireless medium via an antenna, which further receives data and transmits it to processor 202.

[0054] Processor 202 is responsible for managing the bus and general processing, and can also provide various functions, including timing, peripheral interfaces, voltage regulation, power management, and other control functions. Memory 201 can be used to store data used by processor 202 during operation.

[0055] Another embodiment of the present invention relates to a computer-readable storage medium storing a computer program. When executed by a processor, the computer program implements any of the above-described method embodiments.

[0056] That is, those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a device (which may be a microcontroller, chip, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0057] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of the present invention.

Claims

1. A method for reducing the peak-to-average power ratio (PAPR) of Wi-Fi signals, characterized in that, include: Interpolate the Wi-Fi signal to be transmitted to expand the out-of-band bandwidth of the Wi-Fi signal and increase the sampling frequency; Noise is added to the out-of-band signal of the Wi-Fi signal after the bandwidth is expanded, and the Wi-Fi signal with added noise meets the preset spectrum template requirements.

2. The method according to claim 1, characterized in that, Before interpolating the Wi-Fi signal to be transmitted, the process includes: The Wi-Fi signal to be transmitted is subjected to shaping filtering to reduce out-of-band noise of the Wi-Fi signal.

3. The method according to claim 1, characterized in that, Interpolating the Wi-Fi signal to be transmitted includes: The in-band signal of the Wi-Fi signal to be transmitted is interpolated using an interpolation filter.

4. The method according to claim 1, characterized in that, The method further includes: Noise is added to the in-band signal of the Wi-Fi signal, and the Wi-Fi signal after adding noise meets the preset spectrum template requirements.

5. The method according to claim 4, characterized in that, The amount of noise added to both the out-of-band and in-band signals of the Wi-Fi signal after the bandwidth is expanded is the same.

6. The method according to claim 4, characterized in that, The amount of noise added to the out-of-band and in-band signals of the Wi-Fi signal after the bandwidth is expanded is not the same, and the noise added to the out-of-band signal is greater than the noise added to the in-band signal.

7. The method according to claim 1, characterized in that, The out-of-band width of the Wi-Fi signal after the bandwidth expansion is less than the first preset width and / or the sampling frequency after the increase is less than the first preset frequency.

8. The method according to any one of claims 1-7, characterized in that, The noise to be added to the Wi-Fi signal after the bandwidth expansion is obtained through signal simulation. The simulation constraints include: The Wi-Fi signal with added noise meets the preset spectrum template requirements and the preset error phase amplitude index.

9. An electronic device, characterized in that, include: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor to enable the at least one processor to perform a method for reducing the peak-to-average power ratio of Wi-Fi signals as claimed in any one of claims 1 to 8.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the method for reducing the peak-to-average power ratio of Wi-Fi signals as described in any one of claims 1 to 8.

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