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The Impact of Estimation Error and Dwell Time on the Performance of Predetection Selection Diversity Receivers

Selection diversity is a simple and potentially cost-effective combining method to combat fading with an antenna array. However, it is often assumed for true selection diversity (SD) and some of its variants that all branches are available all the time, i.e., that the receiver chain is duplicated for all elements. This allows the selection step to be performed after signal detection. Yet, since only one branch is used in SD at any given time to receive the desired signal, this diversity scheme can be implemented with a single complete receiver chain, switching means, and some simple means to measure signal power in each branch. This paper explores related practical issues, including the incorporation of the proposed scheme in 802.11-based wireless LANs and GSM cellular networks, and provides a performance analysis for such a selection diversity combiner implemented with inexpensive Schottky diodes as signal power measurement devices. Since power measurements thus obtained are noisy, the impact on performance is assessed through analysis in Rayleigh-fading environments. Performance parameters (PDF of output SNR, average output SNR, bit error probability for any modulation scheme) are obtained in closed-form and are compared with ideal selection diversity. It is found that performance can easily be less than 0.5 dB away from ideal selection diversity. Furthermore, the analysis is extended to include the effect of prolonged dwell time, i.e., the minimum interval between switching cycles is longer than the channel coherence time.

Sébastien Roy et Jean-Sébastien Néron
janvier 2005, Wireless Personal Communications, , Anglais,


author = {Sébastien Roy and Jean-Sébastien Néron},
title = {The Impact of Estimation Error and Dwell Time on the Performance of Predetection Selection Diversity Receivers},
journal = {Wireless Personal Communications},
year = {2005},
month = {January},
language = {Anglais},

Dernière modification le jeudi 26 août 2010 à 10h56 par Sébastien Roy