Adaptive filter, implementation method thereof and repeater

Abstract

The invention is applied to the field of communication, and provides an adaptive filter, an implementation method thereof and a repeater. The adaptive filter comprises a filtering module and a tap coefficient updating module; the output of the adaptive filter is the valid convolution sum of a tap coefficient and an input signal of the adaptive filter; the tap coefficient updating module is used for acquiring the tap coefficient of a current moment and comprises a quantization step acquisition sub-module, a complex multiplication sub-module and an addition sub-module, wherein the quantization step acquisition sub-module is used for acquiring a quantization step m(n); the complex multiplication sub-module is used for performing complex multiplication on the input signal u(n) and the quantization step m(n) to obtain an intermediate value m(n)u(n); and the addition sub-module is used for adding the intermediate value m(n)u(n) and the tap coefficient of a previous moment to obtain the tap coefficient of the current moment. When acquiring the tap coefficient of the current moment, the tap coefficient updating module of the adaptive filter can firstly look up a table to obtain the quantization step m(n) and then multiply the u(n) and the m(n), thereby saving considerable hardware resource consumed by a complex multiplication operation performed when the tap coefficient is updated.

Description

technical field [0001] The invention belongs to the communication field, and in particular relates to an adaptive filter, a realization method thereof and a repeater. Background technique [0002] The application history of adaptive interference cancellation is very long, the earliest can be traced back to Wiener era. Existing interference cancellation filters generally have two input ports, one is called the main input signal, which is composed of a useful signal and an interference signal, and the other is called a reference signal, which is composed of an interference signal. After adaptive filtering, the output signal is obtained. At the same time, the output signal is also used as an error signal to adjust the tap weight of the adaptive filter. [0003] The calculation steps of the tap weight of the adaptive filter are as follows: [0004] The first step: Assuming that the number of taps of the adaptive filter is M, assuming that the signal from the receiving antenna ...

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Problems solved by technology

[0017] The purpose of the present invention is to provide an adaptive filter, aiming at solving the problems of too large resources consumed and too long hardware delay when implementing the adaptive filter provided by the prior art

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