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Optimised MLSE equaliser for fast channel tracking and reliable decoding when using space time DPSK block codes for future WPAN

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4 Author(s)
Cepeda, R. ; Toshiba Res. Eur. Limited, Bristol, UK ; Gargin, D. ; Fitton, M. ; Leong, C.

Communication systems which work in excess of, but close to, the channel's coherent bandwidth are expected to have a small number of significant components in their channel's impulse response which causes inter-symbol interference (ISI). Also, for a packet based system, if the channel presents variations during packet transmission, the system can be driven to a high error floor reducing data throughput. The proposed solution uses an optimised maximum likelihood sequence estimator (MLSE) equaliser in conjunction with a space-time block code (STBC) multiple antenna system that works under all the mentioned factors without a considerable increase in complexity but with a high level of flexibility. The optimised MLSE equaliser showed a considerable increment in data throughput for the system under test when using the differential phase shift keying modulation schemes π/2 DBPSK, π/4 DQPSK and 8-DPSK. It is proposed that this approach be adopted for short range, ad hoc, wireless personal area networks (WPAN).

Published in:

Vehicular Technology Conference, 2003. VTC 2003-Spring. The 57th IEEE Semiannual  (Volume:4 )

Date of Conference:

22-25 April 2003

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