An Adaptive Amplitude Recovery System for Transform Domain Interference Suppression

Abstract

The invention discloses an adaptive amplitude recovery system for transform domain interference suppression, and relates to the field of communication. The system includes a frequency domain buffer unit, a frequency domain power adjustment unit, an IFFT transform unit, a time domain buffer unit, a time domain power adjustment unit and a clock domain transform unit. The system firstly adjusts the power of the frequency domain signal after interference suppression, then performs IFFT transform to the time domain signal, and then adjusts the power of the time domain signal to achieve the purpose of adaptive equalization of the time domain signal amplitude. Combined with the transform domain interference suppression technology, the present invention adopts the joint working mode of frequency domain signal power adaptive equalization and time domain signal power adaptive equalization, and compared with the existing transform domain interference suppression technology, it can ensure the stability of the output power of the time domain signal. , it will not be big or small, and the algorithm is simple and effective.

Description

technical field [0001] The invention relates to the field of communications, in particular to an adaptive amplitude recovery system for transform domain interference suppression. Background technique [0002] In the research of spread spectrum communication, the suppression of narrowband interference occupies a very important position. Transform domain interference cancellation technology is widely used because it can cancel multiple narrowband interferences without increasing the complexity of its algorithm. [0003] At present, the common transform domain interference suppression technology basically adopts the filter structure based on FFT and IFFT and the windowed lapped transform method to realize the interference cancellation. However, implementing FFT and IFFT operations on FPGA requires frame-by-frame processing of the input signal in the high-speed clock domain, which will bring about the precision problem of fixed-point word length quantization of digital signals....

AI Technical Summary

Problems solved by technology

This system can avoid the problem of signal power fluctuation in each frame caused by FFT and IFFT operations through the double guarantee of frequency domain power control and time domain power control, so as to achieve the purpose of adaptive equalization of time domain signal amplitude after interference suppression

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