CN116633747A - Method, electronic device and storage medium for reducing Wi-Fi signal peak-to-average ratio - Google Patents

Abstract

The embodiment of the application relates to the field of signal processing, and discloses a method for reducing Wi-Fi signal peak-to-average power ratio, electronic equipment and a storage medium, wherein the method comprises the following steps: interpolation is carried out on Wi-Fi signals to be transmitted so as to enlarge the out-of-band signal bandwidth of the Wi-Fi signals and improve the sampling frequency; noise is added to the out-of-band signal of the Wi-Fi signal after bandwidth expansion, and the Wi-Fi signal after noise addition meets the preset spectrum template requirement. The power amplifier can reduce the peak-to-average ratio of Wi-Fi signals, and can work in a linear area better and not easily enter a saturated state, so that possible signal peak distortion is avoided, and the frequency spectrum expansion, energy leakage and out-of-band interference of signals are reduced.

Description

Method, electronic device and storage medium for reducing Wi-Fi signal peak-to-average ratio

technical field

The invention relates to the field of signal processing, in particular to a method for reducing the peak-to-average ratio of Wi-Fi signals, electronic equipment and a storage medium.

Background technique

The full name of Wi-Fi is Wireless Fidelity, that is, wireless network communication technology. It is a technology that can connect personal computers, handheld devices (such as PDAs, mobile phones) and other terminals to each other in a wireless manner. The main advantage of Wi-Fi is that it does not require wiring and is not limited by wiring conditions. It only needs to connect a wireless router to convert wired signals into wireless Wi-Fi signals.

The wireless signal is a sine wave whose amplitude is constantly changing from the time domain. The amplitude is not constant. The peak amplitude of the signal in one cycle is different from the peak amplitude in other cycles. Therefore, the average power and peak power of each cycle are Different. In a relatively long period of time, the peak power is the maximum transient power that occurs with a certain probability, usually the probability is taken as 0.01%. The ratio of the peak power under this probability to the total average power of the system is the peak-to-average ratio.

Since Wi-Fi signals belong to the OFDM system, Orthogonal Frequency Division Multiplexing (OFDM) has the characteristics of peak-to-average ratio, so Wi-Fi signals with relatively large peak-to-average ratios can easily enter the nonlinear region of the power amplifier. This leads to nonlinear distortion of the signal, causing obvious spectrum spread interference and in-band signal distortion, resulting in a serious decline in the performance of the entire system.

Contents of the invention

The purpose of the embodiment of the present invention is to provide a method for reducing the peak-to-average ratio of Wi-Fi signals, electronic equipment and storage media, which can reduce the peak-to-average ratio of Wi-Fi signals, so that the power amplifier can work better in the linear region and is not easy Entering a saturated state, thus avoiding possible signal peak distortion, reducing the signal spectrum spread, energy leakage and increase of out-of-band interference.

In order to solve the above technical problems, the embodiment of the present invention provides a method for reducing the Wi-Fi signal peak-to-average ratio, including:

Interpolate 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;

Noise is added to 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 satisfies a preset spectrum mask requirement.

Embodiments of the present invention also provide an electronic device, including:

at least one processor; and,

a memory communicatively coupled to the at least one processor; wherein,

The memory stores instructions executable by the at least one processor, the instructions are executed by the at least one processor, so that the at least one processor can perform the Wi-Fi signal peak-to-average reduction described above. than the method.

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

Compared with the prior art, the embodiments of the present invention interpolate the Wi-Fi signal to be transmitted through an interpolation filter, thereby enlarging the out-of-band signal bandwidth of the Wi-Fi signal and increasing the sampling frequency. Subsequently, noise is added to the out-of-band signal after the bandwidth of the out-of-band signal of the Wi-Fi signal is expanded, and the Wi-Fi signal after the noise is added meets a preset spectrum mask requirement. That is, without changing the effective signal in the band, noise is added to the out-of-band signal, so as to achieve the effect of effectively reducing the peak-to-average ratio of the Wi-Fi signal, so that the power amplifier can work better in the linear region and not easily enter the saturation state. It avoids possible signal peak distortion, reduces signal spectrum spread, energy leakage and increase of out-of-band interference.

Description of drawings

FIG. 1 is a specific flow chart 1 of a method for reducing the peak-to-average ratio of Wi-Fi signals according to an embodiment of the present invention;

FIG. 2 is a spectrum template diagram according to an embodiment of the present invention;

FIG. 3 is a specific flow chart II of a method for reducing the peak-to-average ratio of Wi-Fi signals according to an embodiment of the present invention;

FIG. 4 is a specific flowchart three of a method for reducing the Wi-Fi signal peak-to-average ratio according to an embodiment of the present invention;

Fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, various implementation modes of the present invention will be described in detail below in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that, in each implementation manner of the present invention, many technical details are provided for readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in this application can also be realized.

An embodiment of the present invention relates to a method for reducing the peak-to-average ratio of a Wi-Fi signal. As shown in FIG. 1 , the method for reducing the peak-to-average ratio of a Wi-Fi signal provided in this embodiment includes the following steps.

Step 101: Perform interpolation 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.

Among them, interpolation is to insert the corresponding value between each point of the discrete signal, but we do not know the exact value of the continuous signal at this point, so the interpolation is generally to insert a value of 0. If the original signal is x(n), insert L 0 values between two adjacent points, and the interpolated value is x(n/L), which is equivalent to the signal being expanded by L times in the time domain. Similarly, the signal is also in the frequency domain Will be compressed to the original 1/L. At the same time, the frequency spectrum is extended with a period of 2pai/L. Specifically, when the Wi-Fi signal rate is equal to 1 times the bandwidth, interpolation filtering must be performed; when the Wi-Fi signal rate is greater than 1 times the bandwidth, interpolation is optional. The higher the rate after interpolation, the greater the resource consumption, so a balance needs to be struck between interpolation and resource consumption. For a channel, the frequency band is the frequency range between the highest frequency of a signal allowed to be transmitted and the lowest frequency of a signal allowed to be transmitted. Most of the energy in a signal is concentrated within a relatively narrow frequency band. The frequency band where most of the energy of the signal is concentrated is called the effective bandwidth. The signal within the effective bandwidth is the "in-band signal". Signals outside the bandwidth are called "out-of-band signals".

Specifically, the interpolation filter is used to interpolate the Wi-Fi signal to be transmitted. Since the interpolated signal is expanded by L times in the time domain and compressed to the original 1/L in the frequency domain, the interpolated Wi-Fi The bandwidth of the out-of-band signal is enlarged, and the sampling frequency is increased.

Step 102: Add noise to the out-of-band signal of the Wi-Fi signal after the bandwidth expansion, and the Wi-Fi signal after the noise addition meets the preset spectrum mask requirement.

Among them, spectrum is the abbreviation of frequency spectral density, which is the distribution curve of frequency. Complex oscillations are decomposed into harmonic oscillations with different amplitudes and frequencies, and the graphs of the amplitudes of these harmonic oscillations arranged by frequency are called spectrum. The IEEE 802.11 standard specifies a spectral mask that specifies the allowable power allocation in each channel. The spectral mask requires the signal to be attenuated to a specific level (from peak amplitude) at a specified frequency offset. IEEE 802.11 is a common standard for wireless local area networks today, and it is a standard for wireless network communication defined by the Institute of Electrical and Electronics Engineers (IEEE). That is, the Wi-Fi signal after noise is added to the out-of-band signal must also meet the requirements of the spectrum mask.

Specifically, noise is added to the out-of-band signal of the expanded Wi-Fi signal, since the spectrum mask requires the signal to attenuate to a specific level (from the peak amplitude) at a specified frequency offset, the Wi-Fi after adding noise The signal also needs to meet the requirements of the preset spectrum template, and the noise added out of band is designed for the bandwidth of the Wi-Fi signal to be transmitted currently, which can reduce the noise of the peak-to-average ratio.

Taking HE 160M as an example, the spectrum template required by the Wi-Fi protocol is shown in Figure 2. Among them, the signals of the AB segment and the EF segment are the out-of-band signal areas, and the CD segment is the in-band signal area. The corresponding Wi-Fi signal must meet the requirements of the template, and the signal that exceeds the requirements of the spectrum template must not attenuate to a specific level with a specified frequency offset.

It should be noted that the spectrum template in Figure 2 is just an example for easy understanding, and does not constitute any limitation to the spectrum template in this application. The specific spectrum template used in practical applications is determined according to the specific transmission scenario of Wi-Fi signals of.

Compared with the related technology, in this embodiment, the Wi-Fi signal to be transmitted is interpolated by an interpolation filter, thereby enlarging the out-of-band signal bandwidth of the Wi-Fi signal and increasing the sampling frequency. Subsequently, noise is added to the out-of-band signal after the bandwidth of the out-of-band signal of the Wi-Fi signal is expanded, and the Wi-Fi signal after the noise is added meets a preset spectrum mask requirement. That is, without changing the effective signal in the band, noise is added to the out-of-band signal, so as to achieve the effect of effectively reducing the peak-to-average ratio of the Wi-Fi signal, so that the power amplifier can work better in the linear region and not easily enter the saturation state. It avoids possible signal peak distortion, reduces signal spectrum spread, energy leakage and increase of out-of-band interference, and has less damage to in-band signal EVM.

Another embodiment of the present invention relates to a method for reducing the peak-to-average ratio of Wi-Fi signals. As shown in FIG. 3 , before step 101 is performed, the following steps are further included.

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

Specifically, before performing interpolation on the Wi-Fi signal to be transmitted, the Wi-Fi signal to be transmitted is first subjected to shaping filtering to reduce the original out-of-band noise of the currently transmitted Wi-Fi signal. It should be noted that the original out-of-band noise is not the same as 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 It is designed for the bandwidth of the current Wi-Fi signal to be transmitted, and can reduce the noise of the peak-to-average ratio.

After the Wi-Fi signal to be transmitted is subjected to shaping filtering, step 101 is performed: interpolating the Wi-Fi signal to be transmitted, so as to expand the out-of-band signal bandwidth of the Wi-Fi signal and increase the sampling frequency.

In an example, performing interpolation on the Wi-Fi signal to be transmitted may specifically be performing interpolation on an in-band signal of the Wi-Fi signal to be transmitted through an interpolation filter.

Specifically, by interpolating the in-band signal of the Wi-Fi signal, the interpolated Wi-Fi signal is expanded by L times in the time domain, and at the same time compressed to the original 1/L in the frequency domain, then the interpolated Wi-Fi signal The bandwidth of the Fi signal out-of-band signal is enlarged, and the sampling frequency is increased.

In one example, the width of the out-of-band signal of the expanded Wi-Fi signal is smaller than the first preset width and/or the increased sampling frequency is smaller than the first preset frequency.

Specifically, the out-of-band signal bandwidth of the Wi-Fi signal can be expanded by performing interpolation on the Wi-Fi signal. Add more noise. However, the interpolation itself consumes resources, and the operation of reducing the peak-to-average ratio at a high speed after adding noise also requires more resources. In order to strike a balance between resources and performance, it is necessary to limit the interpolation multiple, that is, the width of the out-of-band signal of the Wi-Fi signal after the bandwidth is expanded is smaller than the first preset width and/or the increased sampling frequency is smaller than the first preset width. Set frequency. It should be noted that this embodiment does not impose specific restrictions on the first preset width and the first preset frequency, which can be determined according to relevant parameters such as actual application conditions, resource consumption conditions, and calculation speeds, as long as a balance between resources and performance is obtained. Relatively balanced.

Step 102 is the same as the foregoing implementation manner, and details are not repeated here.

Compared with the related technology, the embodiment of the present invention performs shaping filtering on the Wi-Fi signal to be transmitted before performing interpolation on the Wi-Fi signal to be transmitted, so as to ensure that there is no interference from other symbols at the sampling time of the symbol , to limit the spectrum of the Wi-Fi signal to match the range of the channel bandwidth, thereby reducing the original out-of-band noise in the frequency band of the currently transmitted Wi-Fi signal. By restricting the width of the out-of-band signal of the expanded Wi-Fi signal to be smaller than the first preset width and/or the increased sampling frequency to be smaller than the first preset frequency, this embodiment can achieve a balance between resources and performance relatively balanced.

Yet another embodiment of the present invention relates to a method for reducing the peak-to-average ratio of Wi-Fi signals. As shown in FIG. - Adding noise to the in-band signal of the Fi signal, and the Wi-Fi signal after adding the noise meets the preset spectrum mask requirement.

Step 200: Adding noise to the out-of-band signal of the Wi-Fi signal after the bandwidth expansion, and the Wi-Fi signal after adding the noise meets the preset spectrum mask requirements;

Noise is added to the in-band signal of the Wi-Fi signal, and the Wi-Fi signal after the noise is added meets a preset spectrum mask requirement.

Specifically, in this embodiment, while adding noise to the out-of-band signal of the Wi-Fi signal after the bandwidth is expanded, noise can also be added to the in-band signal of the Wi-Fi signal, so that the in-band signal and the out-of-band signal can be increased simultaneously. noise. And after the in-band signal and the out-of-band signal of the Wi-Fi signal increase noise at the same time, the Wi-Fi signal still needs to meet the preset spectrum mask requirements. Moreover, the magnitude of noise added to the out-of-band signal and the in-band signal of the Wi-Fi signal after bandwidth expansion may be the same or may not be the same.

In one example, it is required that the amount of noise added to the out-of-band signal and the in-band signal of the Wi-Fi signal after the bandwidth expansion is the same.

Specifically, according to the definition of the peak-to-average ratio: the ratio of the maximum square value of the transmission signal (voltage or current) to the average value of the signal square, it can be seen that the increase in the out-of-band signal and in-band signal of the Wi-Fi signal after the bandwidth is expanded The noise of the same size can relatively reduce (relative to the out-of-band signal) the peak value of the Wi-Fi signal, thereby achieving the purpose of reducing the peak-to-average ratio.

In another example, the noise added to the out-of-band signal and the in-band signal of the Wi-Fi signal after the bandwidth expansion is different, and the noise added to the out-of-band signal is greater than the noise added to the in-band signal .

Specifically, noise of the same size is added to the out-of-band signal and in-band signal of the Wi-Fi signal after the bandwidth is expanded. If you want to reduce the peak-to-average ratio of the Wi-Fi signal, you need to reduce the Wi-Fi signal The size difference of , that is, the noise added in the out-of-band signal is greater than the noise added in the in-band signal, so that the peak value of the Wi-Fi signal is relatively reduced.

In an example, the noise that needs to be added to the Wi-Fi signal after the bandwidth is expanded is obtained through signal simulation, and the constraint condition of the simulation can be: the Wi-Fi signal after the noise is added meets the preset spectrum mask requirements, And meet the preset error phase magnitude index.

Specifically, the reason why the Wi-Fi signal still satisfies the spectrum mask after adding noise is that the magnitude of the added noise in the Wi-Fi signal is obtained in advance through signal simulation. Calculate the noise ratio of the in-band signal and out-of-band signal to be added to the Wi-Fi signal by setting the Wi-Fi signal after adding noise to meet the preset spectrum mask requirements and the preset error phase amplitude index. Maximize the output result of the signal simulation method. Take this result and add noise to the in-band and out-of-band signals of the Wi-Fi signal based on the result.

Compared with related technologies, this implementation mode can add noise to the in-band signal of the Wi-Fi signal while adding noise to the out-of-band signal of the Wi-Fi signal after the bandwidth is expanded, so as to realize the in-band signal and the out-of-band signal. The external signal increases the noise at the same time, and the way of reducing the peak-to-average ratio can be selected more diversely. And through the signal simulation method, the maximum value of the noise added to the in-band signal and out-of-band signal of the Wi-Fi signal is calculated, combined with the increase in the noise of the out-of-band signal and the in-band signal of the Wi-Fi signal after the bandwidth is expanded The size relationship, more precisely control the added noise, and minimize the peak-to-average ratio of the Wi-Fi signal.

Another embodiment of the present invention relates to an electronic device, as shown in FIG. 5 , including at least one processor 202; and a memory 201 communicatively connected to at least one processor 202; Instructions executed by the processor 202, the instructions are executed by at least one processor 202, so that the at least one processor 202 can execute any one of the foregoing method embodiments.

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

Processor 202 is responsible for managing the bus and general processing, and may also provide various functions including timing, peripheral interfacing, voltage regulation, power management, and other control functions. And the memory 201 may be used to store data used by the processor 202 when performing operations.

Another embodiment of the present invention relates to a computer-readable storage medium storing a computer program. When the computer program is executed by the processor, any one of the above method embodiments is implemented.

That is, those skilled in the art can understand that all or part of the steps in the method of the above-mentioned embodiments can be completed by instructing related hardware through a program, the program is stored in a storage medium, and includes several instructions to make a device ( It may be a single-chip microcomputer, a chip, etc.) or a processor (processor) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk, and other media that can store program codes.

Those of ordinary skill in the art can understand that the above-mentioned embodiments are specific examples for realizing the present invention, and in practical applications, various changes can be made to it in form and details without departing from the spirit and spirit of the present invention. scope.

Claims (10)

1. A method for reducing Wi-Fi signal peak-to-average ratio, characterized in that, comprising: Interpolate 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; Noise is added to 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 satisfies a preset spectrum mask requirement. 2. The method according to claim 1, wherein, before interpolating the Wi-Fi signal to be transmitted, comprising: performing shaping filtering on the Wi-Fi signal to be transmitted, so as to reduce out-of-band noise of the Wi-Fi signal. 3. The method according to claim 1, wherein interpolating the Wi-Fi signal to be transmitted comprises: The in-band signal of the Wi-Fi signal to be transmitted is interpolated by an interpolation filter. 4. The method according to claim 1, wherein the method further comprises: Noise is added to the in-band signal of the Wi-Fi signal, and the Wi-Fi signal after adding noise meets a preset spectrum mask requirement. 5 . The method according to claim 4 , wherein the noise added to the out-of-band signal and the in-band signal of the Wi-Fi signal after bandwidth expansion is required to be the same. 6. The method according to claim 4, characterized in that the amount of noise added to the out-of-band signal and the in-band signal of the Wi-Fi signal after the bandwidth expansion is required to be different, and in the out-of-band signal of the Wi-Fi signal The added noise in the out-of-band signal is greater than the added noise in the in-band signal. 7. The method according to claim 1, wherein the width of the out-of-band signal of the Wi-Fi signal after the bandwidth expansion is smaller than the first preset width and/or the increased sampling frequency is smaller than the first preset frequency. 8. The method according to any one of claims 1-7, wherein the noise that needs to be added in the Wi-Fi signal after the bandwidth is expanded is obtained by signal simulation, and the simulation constraints include : The noise-added Wi-Fi signal meets a preset spectrum mask requirement and a preset error phase magnitude index. 9. An electronic device, characterized in that it comprises: at least one processor; and, a memory communicatively coupled to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, the instructions are executed by the at least one processor, so that the at least one processor can perform the operation described in any one of claims 1 to 8 The method for reducing the Wi-Fi signal peak-to-average ratio described above. 10. A computer-readable storage medium, storing a computer program, characterized in that, when the computer program is executed by a processor, the method of reducing the Wi-Fi signal peak-to-average ratio according to any one of claims 1 to 8 is realized. method.