Bit error rate performance analysis of a threshold-based generalized selection combining scheme in Nakagami fading channels

Authors:
Ahmed Iyanda Sulyman;Maan Kousa
Affiliations:
Electrical and Computer Engineering Department, Faculty of Applied Science, Queen's University, Kingston, ON, Canada K7L 3N6;Electrical Engineering Department, College of Engineering Sciences, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
Venue:
EURASIP Journal on Wireless Communications and Networking - Special issue on advanced signal processing algorithms for wireless communications
Year:
2005

Citing 3
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Abstract

The severity of fading on mobile communication channels calls for the combining of multiple diversity sources to achieve acceptable error rate performance. Traditional approaches perform the combining of the different diversity sources using either the conventional selective diversity combining (CSC), equal-gain combining (EGC), or maximal-ratio combining (MRC) schemes. CSC and MRC are the two extremes of compromise between performance quality and complexity. Some researches have proposed a generalized selection combining scheme (GSC) that combines the best M branches out of the L available diversity resources (M ≤ L). In this paper, we analyze a generalized selection combining scheme based on a threshold criterion rather than a fixed-size subset of the best channels. In this scheme, only those diversity branches whose energy levels are above a specified threshold are combined. Closed-form analytical solutions for the BER performances of this scheme over Nakagami fading channels are derived. We also discuss the merits of this scheme over GSC.