Method and device for reducing signal peak-to-average ratio based on frequency domain processing

A technology of signal peak-to-average ratio and frequency domain signal, which is applied in the field of wireless communication to improve the spread of signal spectrum, improve the rise of noise floor, and weaken the effect of PAPR rebound

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  • Application Information

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Problems solved by technology

Therefore, the applicability of the signal PAPR reduction scheme in the prior art is limited. In these scenarios, the PAPR reduction scheme should use EVM as the target parameter, while taking into account the requirements of PAPR and adjacent channel power leakage ratio ACPR (Adjacent Channel Power Ratio)

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  • Method and device for reducing signal peak-to-average ratio based on frequency domain processing
  • Method and device for reducing signal peak-to-average ratio based on frequency domain processing
  • Method and device for reducing signal peak-to-average ratio based on frequency domain processing

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Embodiment 1

[0046] This embodiment provides a method for reducing the signal peak-to-average ratio based on frequency domain processing, such as figure 1 As shown, the method includes:

[0047] S101. Perform hard clipping processing HC (Hard Clipping) on ​​the input signal data_in, and the output signal after peak clipping processing is data_clip;

[0048] S102. Perform fast Fourier transform on the output signal data_clip, and output frequency domain signal data_freq; perform fast Fourier transform on the input signal data_in, and output frequency domain signal data_in_freq;

[0049] S103. Calculate the error vector magnitude EVM (Error Vector Magnitude) after peak clipping, and the described EVM calculation formula is: Among them, S max Indicates the maximum constellation amplitude, L indicates the length of the in-band signal; I indicates the range of the start and end points of the in-band signal; E(k) indicates the frequency domain difference of the signal before and after process...

Embodiment 2

[0066] This embodiment provides a method for reducing the signal peak-to-average ratio based on frequency domain processing, such as figure 2 As shown, the method includes:

[0067] S201. Perform noise shaping peak clipping NS-CLIP (Noise Shape Clip) on the input signal data_in, and the output signal after peak clipping processing is data_clip;

[0068] The difference from Embodiment 1 is that in this embodiment, noise shaping peak clipping NS-CLIP (Noise Shape Clip) is used to perform peak clipping processing on the input signal data_in, such as Figure 2a as shown in:

[0069] S201a. Calculate noise information. Different from the hard clipping that directly cuts the peak, the noise shaping clipping first detects the peak information and retains the peak information, and then obtains the noise information. Wherein, the noise information can be obtained through the peak information and the crest factor CF (Crest Factor), specifically, noise = peak value - clipping thresho...

Embodiment 3

[0097] This embodiment provides a device for reducing the signal peak-to-average ratio based on frequency domain processing, such as Figure 4 As shown, the peak clipping module in this implementation is a hard peak clipping module, see Figure 5 , the device includes:

[0098] The hard peak clipping module 301 is used to perform hard peak clipping processing on the input signal data_in, and output the signal data_clip;

[0099] The first operation module 302 is configured to perform fast Fourier transform on the output signal data_clip to output a frequency domain signal data_freq; perform fast Fourier transform on the input signal data_in to output a frequency domain signal data_in_freq;

[0100] The calculation module 303 is configured to calculate the error vector magnitude EVM after peak clipping before adjusting the frequency domain signal data_freq.

[0101] The EVM calculation formula is: Among them, S max Indicates the maximum constellation amplitude, L indicates...

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Abstract

The invention provides a method and a device for reducing a signal peak-to-average ratio based on frequency domain processing. The method comprises the following steps: performing peak clipping processing on an input signal, converting the signal subjected to peak clipping processing from a time domain to a frequency domain through fast Fourier transform, performing in-band and out-band processingon the signal in the frequency domain respectively, and converting the peak clipping signal into the time domain through inverse fast Fourier transform on the signal subjected to in-band and out-bandprocessing, thereby obtaining a peak clipping signal. The peak-to-average ratio of the signal is reduced in the frequency domain, the error vector amplitude can be controlled, and the requirement ofthe adjacent channel power leakage ratio is considered.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a method and device for reducing signal peak-to-average ratio based on frequency domain processing. Background technique [0002] In modern communication systems, the signal modulation method leads to higher and higher signal peak-to-average ratio PAPR (Peak to AveragePowerRatio), and the peak-to-average ratio will increase the degree of nonlinear distortion of the power amplifier. Linearity and conversion efficiency requirements are also higher. Using the traditional power back-off method can make the power amplifier work in the linear region, but it will lead to a reduction in output power and efficiency, thereby reducing its coverage. Therefore, the industry has proposed many methods for reducing the signal peak-to-average ratio, thereby reducing power backoff and improving the output power and efficiency of the power amplifier. [0003] At present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2614
Inventor 李扬杨利鲍东山
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