A Generalized Performance Study of DS-CDMA Uplink/Downlink Receivers in Nakagami Wideband Fading Channel

Mohammed ABDEL-HAFEZ  Fatih ALAGOZ  

Publication
IEICE TRANSACTIONS on Communications   Vol.E88-B   No.1   pp.333-344
Publication Date: 2005/01/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.1.333
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Terrestrial Radio Communications
Keyword: 
wideband fading channel,  Nakagami distribution,  DS-CDMA,  differential and coherent RAKE receivers,  multiple-access interference,  bit error probability,  

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Summary: 
In this paper, we consider a mobile system consisting of a single isolated circular cell with K independent users simultaneously sharing the channel using binary DS-CDMA to establish a full duplex channel with the base station. Both coherent and differential detection RAKE receivers with Maximal Ratio Combining (MRC) techniques are considered. The performance of two uplink/downlink receivers in Nakagami wideband fading channel is studied. Our approach relies on the use of total instantaneous interference power calculations instead of the use of average power approximations. We analyzed and derived new exact formulae for bit error probabilities for the considered system, and presented a set of numerical results both for the exact formulae and Gaussian approximation. The performance comparisons suggest that the exact formulae provide superior performance to Gaussian approximation especially at low number of users and either high fading parameters of the desired user or low fading parameters of the MAIs.