Self-adaptive window length crest factor reduction method and system and storage medium

Abstract

The invention discloses a method and a system for reducing a crest factor of a self-adaptive window length, and a storage medium. The method comprises the following steps: acquiring a peak window length k1 of a signal for detecting a peak value; comparing the peak window length k1 with a preset length k2; if k1 is greater than k2, recording the position of the peak point at the moment; performing interpolation on the peak value window data, solving an extreme point position and a peak value, and extracting a peak value difference and a phase; calculating a peak clipping peak point position according to the extreme point position and the recorded peak point position; weighting a pulse signal according to the peak difference and the phase, and subtracting a delay signal from the pulse signal to obtain a peak-clipping signal; judging whether the signal after peak clipping meets a peak-to-average ratio requirement or not; and if so, ending the process. Compared with the prior art, the amplitude difference, the phase and the position of a real peak point are obtained through interpolation, the peak loss and regeneration probability is reduced, the calculation amount is reduced, and the algorithm performance is improved.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method, system and storage medium for reducing crest factor of adaptive window length. Background technique [0002] Such as figure 1 As shown, the pulse cancellation method (PC-CFR) has become the mainstream crest factor suppression mainstream method in the OFDM system due to its good performance in reducing spectrum leakage. Its working principle is as follows: [0003] 1. Divide the input peak-to-average ratio (High PAR) signal into two channels, one is used as a delay signal, and the other is used to detect the peak value; [0004] 2. Perform peak detection and retain the position, amplitude and phase information of the peak point; [0005] 3. Use the amplitude difference and phase information of the peak point to weight the stored pulse signal, and the spectrum of the pulse signal is consistent with the spectrum of the input signal; [0006] 4. Subtract t...

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Problems solved by technology

[0011] The main purpose of the present invention is to propose a method, system and storage medium for reducing the peak factor of an adaptive window length, aiming at solving the problem of large detection deviation at a low sampling rate, and distinguishing the peak points according to the peak window length, and then obtaining The amplitude difference and phase of the true peak point, thereby effectively reducing the peak-to-average ratio, reducing the probability of peak loss and regeneration, and improving algorithm performance

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