关键词: RLS算法, WSSUS衰落信道, 可变遗忘因子

Abstract: This paper presents the Mean Square Error（MSE） analysis of Variable Forgetting Factor Recursive Least Square（VFF-RLS） algorithm for Wide-Sense Stationary Uncorrelated Scattering（WSSUS） fading channels.Unlike most of RLS analyses，this analysis takes the correlation of inverse of correlation matrix into account and hence yields an improved recursive formula for the MSE，which can be computed recursively with the information of the second order statistics of fading channels.The forgetting factor of RLS is varied by a gradient algorithm derived from the MSE analysis of VFF-RLS.Experimental results show that the VFF-RLS algorithm has smaller MSE than typical adaptive algorithms and better tracking ability.

Key words: Recursive Least Square（RLS） algorithm, Wide-Sense Stationary Uncorrelated Scattering（WSSUS） fading channels, Variable Forgetting Factor（VFF）