Approximation Error Analysis for Coherent EGC Receiver under Nakagami-m Fading Channels

Youngsun KIM  Kiseon KIM  

Publication
IEICE TRANSACTIONS on Communications   Vol.E87-B   No.6   pp.1702-1705
Publication Date: 2004/06/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technology
Keyword: 
fading,  m-distribution,  EGC,  BER,  

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Summary: 
The generalized fading amplitude can be expressed using the Nakagami-m distribution. The probability density function (PDF) for the sum of m-distributions is needed to evaluate performance of diversity combining technique such as equal gain combining (EGC) receiver. The approximated PDF for the sum of m-distributions gives simpler performance expression and reduces the computational complexity in evaluating EGC performance. We investigate the normalized approximation error of EGC performance. From the observed result, even for m > 2, the approximated BER is not accurate. For example, the normalized error is about 32% for m = 2 with 3 identical and independently distributed (IID) fading branches and 10 dB SNR.