Optimal Step-Size Mechanism for Stochastic Gradient Algorithm Applied to CDMA Receiver in Multipath Fading Channels

被引：0
|
作者：
Ueng, Fang-Biau [1 ]
Chang, Jui-Chi [1 ]
Wang, Hsuan-Fu [1 ]
Chen, Ming-Chang [1 ]
机构：
[1] Natl Chung Hsing Univ, Dept Elect Engn, Taichung 40227, Taiwan
来源：
2009 IEEE 20TH INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS | 2009年
关键词：
LMS ALGORITHMS; CONVERGENCE; SYSTEMS;
D O I：
10.1109/PIMRC.2009.5449762
中图分类号：
TN [电子技术、通信技术];
学科分类号：
0809 ;
摘要：
This paper investigates the optimal step-size mechanism for a stochastic gradient (SG) based direct sequence (DS-) code division multiple access (CDMA) receiver under the influence of the multiple access interference (MAI) and intersymbol interference (ISI) in multi-path environments by utilizing a simple stochastic model. The convergence of the derived optimal step-size sequence is verified analytically. The learning curve is applied to analyze and compare the speed of convergence and residual mean-squared error (MSE) for the fixed and time-varying step-size sequence methodologies. Simulations show that the receiver utilizes the derived optimal step-size sequence not only has faster convergent speed and smaller MSE, but also is robustly to different multi-path channels.
引用
收藏
页码：3133 / 3137
页数：5
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