基于SVD和小波变换的信道估计新方法

A new way of channel estimation based on SVD algorithm and wavelet transform

在正交频分复用系统中,发射的信号在频域中经历了乘性衰落的同时还经历了加性噪声的干扰,从而影响了估计的质量。将小波去噪用于信道估计中以去除其中的加性干扰,然后基于奇异值低阶近似算法对信道转移矩阵再进行低阶近似。仿真结果表明,该运算的复杂度降低了,提高了SVD系统估计的准确度。

The values of the estimated channel coefficients are composed of the multiplicative fading which is needed, and the additive fading which is negative to the quality of the estimation in the OFDM systems. Wavelet de-noising is used to impair the negative effect. Then using singular decomposition value （SVD） low rank approximation to achieve a superior performance. It has been validated that the method improved the system performance without increasing complexity.