O3BPSK-based Linear Decorrelating Detector for Asynchronous DS/CDMA Systems over Frequency-Selective Rayleigh Fading Channels

Authors:
Chia-Hsin Cheng;Jen-Yung Lin;Chao-Kai Wen;Jyh-Horng Wen
Affiliations:
The Department of Computer and Communication Engineering, Chaoyang University of Technology, Wufong Township, Taiwan, ROC 41349;The Department of Computer Science and Information Engineering, Da-Yeh University, Da-Tsuen, Taiwan, ROC 515;The Institute of Electrical Engineering, National Chung Cheng University, Ming-Hsiung, Taiwan, ROC 621;The Department of Electrical Engineering, Tunghai University, Taichung, Taiwan, ROC 40704
Venue:
Wireless Personal Communications: An International Journal
Year:
2009

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Abstract

In this paper, a convenient signaling scheme, called orthogonal on---off BPSK (O3BPSK), along with a simple one-shot linear decorrelating detector (LDD) and a whitening Rake bank, is proposed for near---far resistant detection in asynchronous DS/CDMA systems. Based on the maximum multi-path spreading delay, a minimum duration of "off" is suggested, during which the temporally adjacent bits (TABs) that contain multi-user interference (MUI) and inter-symbol interference (ISI) from different users at the receiver are decoupled. The O3BPSK signaling scheme is combined with the whitening Rake receiver to preserve multi-path diversity gain in multi-path fading CDMA channels. The scheme offers low complexity, no detection delay, near---far resistance, and compensation for fading channels.