Direct-Sequence/Spread-Spectrum Communication System with Sampling Rate Selection Diversity

Yohei SUZUKI  Anas M. BOSTAMAM  Mamiko INAMORI  Yukitoshi SANADA  

IEICE TRANSACTIONS on Communications   Vol.E91-B    No.1    pp.267-273
Publication Date: 2008/01/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.1.267
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
oversamping,  diversity,  direct-sequence/spread-spectrum (DS/SS),  RAKE receiver,  multipath channel,  cognitive radio,  

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In this paper, sampling rate selection diversity (SRSD) scheme for Direct-Sequence/Spread-Spectrum (DS/SS) is proposed. In DS/SS communication systems, oversampling may be employed to increase the signal-to-noise ratio (SNR). However, oversampling enlarges the power consumption because signal processing of the receiver has to be carried out at a higher clock rate. Higher sampling rate does not always maximize the SNR. In the proposed SRSD scheme, the power consumption can be reduced by selecting the optimum sampling rate depending on the characteristics of the channel. The proposed SRSD scheme can also reduce the BER more than the conventional oversampling scheme under certain channel conditions.