Efficient channel estimation for OFDM modulations with transmit diversity

Authors:
Rui Dinis;Atul Kumar;Nuno Souto;João Silva
Affiliations:
Tech. Univ. of Lisbon, Portugal;Tech. Univ. of Lisbon, Portugal;Instituto Superior Técnico, Lisboa, Portugal;Instituto Superior Técnico, Lisboa, Portugal
Venue:
CIIT '07 The Sixth IASTED International Conference on Communications, Internet, and Information Technology
Year:
2007

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Abstract

This paper considers the use of implicit pilots for channel estimation in OFDM schemes (Orthogonal Frequency Division Multiplexing) with transmit diversity. To cope with the interference levels between data and pilots, we propose an iterative receiver with joint detection and channel estimation. For the first iteration, the channels are estimated by averaging the received signal over several blocks; for the remaining iterations, enhanced channel estimates are obtained by considering the data symbols as extra pilots. Our performance results show that this technique allows the use of low-power pilots, with performances close to the ones with perfect channel estimation.