Method and system for despicking of wideband signal

Abstract

The invention provides a method and a system for carrying out peak clipping to wideband signals, the system includes an error signal generation module, a filtering module, a time-delay module and a superposition module, and the method includes the following steps: the error signal generation module generates an error signal e(n) according to the difference value of the peak envelope of an input signal x (n) and a preset peak-clipping threshold A0; the filtering module receives the error signal and filters the error signal by using an FIR filter to obtain a cancellation signal c(n); the time-delay module calculates the total delay of the error signal generation module and the filtering module, and delays the input signal to output a time-delay signal, the delay value of the time-delay signal is equal to the total delay; the superposition module superposes the cancellation signal and the time-delay signal for peak clipping. The method and the system of the invention utilize the FIR filter to filter the error signal so as to generate the cancellation signal, and completes the peak clipping of the signals by superposition, thus being easy to be realized, consuming less hardware resource and avoiding the spread of the frequency domain and the regeneration of the peak value.

Description

technical field [0001] The present invention relates to signal processing, in particular to a method and system for performing peak clipping on broadband signals. Background technique [0002] At present, 3G signals and above signals, such as CDMA2000 signals, WCDMA signals, TD-SCDMA signals and other broadband signals such as WIMAX signals, usually have a problem of too high peak-to-average ratio (PAR). At the radio frequency transmitter, the peak-to-average ratio signal has very high requirements on the dynamic working range of the power amplifier. In order to meet the linearity requirements, it is necessary to back off the power of the power amplifier so that the average power of the input signal plus the peak-to-average ratio is less than the 1dB compression point of the power amplifier; and in order to improve efficiency, it is required to increase the average power of the input signal as much as possible, thereby improving the power amplifier. s efficiency. It can be...

AI Technical Summary

Problems solved by technology

Since the window function filtering and peak clipping method is a multiplication process in the time domain, it is a convolution process in the frequency domain, which will lead to spectral expansion of the signal and cause deterioration of the adjacent channel power ratio (ACPR); On the one hand, the existing window function filter peak clipping method will also have peak regeneration phenomenon, and the peak clipping effect is not ideal

Images