Evaluation of Selective Rake Receiver in Direct Sequence Ultra Wideband Communications

Mohammad Azizur RAHMAN  Shigenobu SASAKI  Jie ZHOU  Shogo MURAMATSU  Hisakazu KIKUCHI  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E87-A   No.7   pp.1742-1746
Publication Date: 2004/07/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section LETTER (Special Section on Multi-dimensional Mobile Information Networks)
Category: Mobile Communication
Keyword: 
ultra wideband,  selective Rake receiver,  spreading bandwidth,  power delay profile,  partial band interference,  

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Summary: 
Performance of selective Rake (SRake) receiver is evaluated for direct sequence ultra wideband (DS-UWB) communications considering an independent Rayleigh channel having exponentially decaying power delay profile (PDP). BEP performances are shown. The results obtained are compared with similar results in a channel having flat PDP. Assumption of a flat PDP is found to predict the optimum spreading bandwidth to be lower and sub-optimum operating performance beyond optimum spreading bandwidth to be severely worse than that is achievable in a channel having exponentially decaying PDP by employing an SRake receiver having fixed number of combined paths. Optimum spreading bandwidth for SRake in a channel having exponentially decaying PDP is shown to be much larger than the one in a channel having flat PDP; that is specifically a good-news for UWB communications. Effects of partial band interference are also investigated. Interference is found to be less effective in exponentially decaying PDP.