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EM-based semi-blind estimation of time-varying channels

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4 Author(s)
Mazet, L. ; Motorola Labs-Paris, Gif-sur-Yvette, France ; Buzenac-Settineri, V. ; de Courville, M. ; Duhamel, P.

OFDM systems traditionally perform channel coefficients estimation relying on known training sequences. However in wireless systems, performance and mobility can be further enhanced either by operating semi-blind channel estimation refinement or variation tracking between reference symbols. In this paper we propose an EM-based channel tracking method using a simple order 1 AR modelling of the channel variations. The proposed approach is applicable to both single carrier and OFDM systems. Simulation results presented in the context of 5 GHz WLAN show that this new algorithm allows us to reach the performance of a receiver having a perfect knowledge of the channel coefficients even in the mobile environment (3 m/s).

Published in:

Signal Processing Advances in Wireless Communications, 2003. SPAWC 2003. 4th IEEE Workshop on

Date of Conference:

15-18 June 2003