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

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Abstract

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.

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Authors and Affiliations

  1. Département de génie électrique et de génie informatique, Université Laval, Québec, QC, Canada, G1K 7P4

    Sébastien Roy & Jean-Sébastien Néron

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  1. Sébastien Roy
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  2. Jean-Sébastien Néron
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Correspondence to Sébastien Roy.

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Sebastien Roy received the B. Sc. A. and M. Sc. degrees in electrical engineering from l’Université Laval, Québec, Canada, in 1991 and 1993, respectively, and the Ph.D. degree from Carleton University, Ottawa, Canada, in 2000. He is currently an Assistant Professor at the Department of Electrical and Computer Engineering, Université Laval, where he is pursuing research in the system-level and implementation aspects of signal processing for communications as well as space-time processing and space-time coding. From 2000 to 2002, he was a Natural Sciences and Engineering Research Council of Canada Postdoctoral Fellow at l’Université Laval. He has been active in industrial consulting and was involved in the organization of an international conference. Prof. Roy received the Post-Graduate Research Excellence Award from the Canadian Institute of Telecommunications Research in 2000.

Jean-Sébastien Néron received the B.Sc. degree in electrical engineering from École de technologie supérieure, Montréal, Canada in 2000 and the M.Sc. degree in electrical engineering from Laval University, Québec, Canada in 2005. He is currently working towards the Ph.D. degree on the design and realization of a wideband millimeter-wave smart antenna. He acquired industrial experience in various R&D departments especially on RF Modems, RF measurements and characterization, and embedded systems design. His research interests include planar antennas, microwave circuits, and channel characterization at millimetre-wave frequencies.

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Roy, S., Néron, JS. The Impact of Estimation Error and Dwell Time on the Performance of Predetection Selection Diversity Receivers. Wireless Pers Commun 33, 87–108 (2005). https://doi.org/10.1007/s11277-005-7224-5

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