Blind adaptive filtering device capable of eliminating narrowband interference and its application

Abstract

A blind self-adaptive filtering method, an apparatus and a broadband transmission system for eliminating narrowband interference are provided. The self-adaptive filtering apparatus includes: a self-adaptive filter, for filtering the current input signal and then outputting it, a first delay unit, for delaying the signal output from the self-adaptive filter with a first time delay length, and an error calculation unit, for implementing correlation operation on the signal output from the self-adaptive filter and the delay signal of the output signal to obtain error information. The self-adaptive filter adjusts the filter parameter according to the feedback error information to eliminate the interference in the latter input signal. As applying the output signal to implement correlation operation with the delay signal of the output signal, thus, the apparatus is used widely, for example, it can be applicable to broadband receiver, it also can be applicable to the case that there are a plurality of strong narrowband interferences, and it also can counteract a plurality of strong narrowband interferences whose swept rate is decades of milliseconds.

Description

technical field [0001] The present invention relates to a blind adaptive filtering device capable of eliminating narrowband interference, in particular to a device for adjusting adaptive filter parameters based on error information obtained after correlative processing of an output signal and a delayed signal of the output signal and its application. Background technique [0002] In broadband communication transmission systems, especially in wireless broadband communication transmission systems, narrowband interference signals such as analog or digital co-frequency or adjacent frequency interference will seriously affect the performance of transmission. Therefore, filtering has become one of the most basic and extremely important technologies in the field of electronic information processing. Using filtering technology, the required signal can be extracted from complex signals while suppressing noise or interference. In fact, the filter becomes a frequency-selective system,...

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Problems solved by technology

However, the convergence speed of these methods is very slow, and they can only deal with interfering signals with specific spectral shapes, which means that these methods cannot be widely used in more general scenarios, such as those with frequency hopping interference or the center frequency of the interfering signal changing rapidly. surroundings

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