降低噪声的自适应滤波器的设计与实现

Design and Realization of an Adaptive Filter for Noise Suppression

LINC(用非线性器件实现非线性放大)发射机系统中的信号分离器(SCS)等部分因为会给系统带来噪声而影响系统性能,而目前在各种抑制噪声的方案中,数字自适应滤波器在各个领域都有很好的发展前景。本文的研究采用基于复杂度低、在平稳环境中快速收敛、均值无偏收敛的最小自适应(LMS)的算法来设计并实现了一个降低噪声的数字滤波器。在借助matlab平台进行仿真证明此方法降噪的可行性后结合TI的TMS320C6416这款芯片,最终得到了噪声抑制和信号增强的结果。

At the transmitter system of LINC, the noise brought by the part of SCS and others can affect the characters of the transmitter system. In the present, as we known, among a variety of methods in noise suppression, digital adaptive filter is very promising in all kinds of fields. We will design and realize a digital adaptive filter that could decrease noise basing on the research of leastmean-square （LMS） which has the characters of low complication,fast convergence in the steady condition and unbiased convergence of the mean. After verification of the feasibility that this method could decrease noise using matlab flat, in the end we realize noise suppression and enhancing useful signal on the chip of TMS320C6416 belonging to TI.