A variable step-size CM array algorithm for fast fading channels

被引：11
|
作者：
Mathur, A [1 ]
Keerthi, AV [1 ]
Shynk, JJ [1 ]
机构：
[1] UNIV CALIF SANTA BARBARA,DEPT ELECT & COMP ENGN,SANTA BARBARA,CA 93106
来源：
IEEE TRANSACTIONS ON SIGNAL PROCESSING | 1997年 / 45卷 / 04期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1109/78.564199
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
A new constant modulus (CM) array algorithm with a time-varying step size is presented. It is designed for use in a cascade multistage system where each beamformer stage recovers one cochannel source. We assume that each source has a small angular spread and that the antenna elements are closely spaced. For this scenario, the new algorithm ensures that a stage tracks the same source during fast fading conditions, thus yielding reliable source estimation in a nonstationary environment. We present the cost function associated with the algorithm and compare it with that of the original CM array. Computer simulations for Rayleigh fading channels are presented to illustrate the improved tracking behavior of the multistage CM array.
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页码：1083 / 1087
页数：5
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