Downlink performance and complexity evaluation of equalisation strategies for an MC-CDMA ‘4G’ physical layer candidate

MA Cooper, SMD Armour, JP McGeehan

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This paper focuses on the performance of equalisation strategies for a downlink MC-CDMA (Multi Carrier-Code Division Multiple Access) based system. MC-CDMA is a leading candidate modulation/multiple access scheme for so called 4th Generation communications. Simulation results utilising Maximum Ratio Combining (MRC), Equal Gain Combining (EGC), Orthogonal Restoring Combining (ORC), and Minimum Mean-Squared Error Combining (MMSEC) for multi-user scenarios are presented. Performance is characterised by bit error rate (BER) for the downlink. A time domain least square channel estimator was implemented along with a frequency based pilot estimation scheme and comparisons made with perfect channel estimation. A complexity analysis of each equalisation scheme is also undertaken. Performance results show that MMSEC provides the best performance for the multi-user scenario as MRC and ultimately EGC both enter error floors as the number of users increase in a wideband channel thereby reducing their usefulness as multi user equalisation schemes
Original languageEnglish
Publication statusPublished - Nov 2003

Bibliographical note

Sponsorship: M.A. Cooper would like to thank Toshiba Research Europe Limited (TREL) for their financial and academic support, and in particular the academic support given by Dr. D. McNamara. Thanks are also due to the Engineering and Physical Sciences Research Council (EPSRC) for their financial support

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Name of Conference: 10th Symposium on Communications and Vehicular Technology (SCVT) in the Benelux
Venue of Conference: Eindhoven, Holland


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