On the performance of O3BPSK LDD with diversity combining techniques over fading channels

Authors:
Chia-Hsin Cheng;Jen-Yung Lin;Jyh-Horng Wen;Chao-Kai Wen
Affiliations:
The Department of Computer and Communication Engineering, Chaoyang University of Technology, 168, Jifong East Road, Wufong Township, Taichung County 413, Taiwan, ROC;The Department of Computer Science and Information Engineering, Da-Yeh University, 112, Shan-Jiau Road, Da-Tsuen, Chang-Hua 515, Taiwan, ROC;The Department of Electrical Engineering, Tunghai University, 181, Section 3, Taichung Harbor Road, Taichung 407-04, Taiwan, ROC;The Institute of Electrical Engineering, National Chung Cheng University, 168, University Road, Min-Hsiung, Chia-Yi 621, Taiwan, ROC
Venue:
Computer Communications
Year:
2008

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Abstract

Zheng and Barton developed a convenient signaling scheme (orthogonal on-off BPSK (O^3BPSK)) with a simple one-shot linear decorrelating detector (LDD) for near-far resistant detection in asynchronous DS/CDMA systems. This paper studies the performance of the O^3BPSK LDD system over a frequency-nonselective and slowly fading channel. Three types of channel model are considered, namely Rayleigh fading, Nakagami-m fading, and Ricean fading. The analytical results show that channel fading causes a significant degradation in the performance of the O^3BPSK LDD receiver. Nevertheless, the receiver still demonstrates a better near-far resistant property than a conventional CDMA receiver over fading channels. This study also analyzes the effect of two well-known diversity combining techniques on the O^3BPSK LDD performance over Rayleigh fading channels. The results indicate that diversity combining techniques significantly improve the performance of the O^3BPSK LDD scheme over fading channels.