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Linear Space-Time Precoding for OFDM Systems Based on Long-Term Channel State Information

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International Journal of Wireless Information Networks Aims and scope Submit manuscript

Abstract

This work addresses the severe performance degradation for OFDM systems when long channel delays exceed the guard interval. Such long delays can be seen as an interference source on the one hand and also as a valuable frequency diversity source on the other hand. Instead of simply suppressing such long delays, e.g. by beamforming at the transmitter, we propose a new precoding scheme, which attempts to find an optimum trade-off between the interference suppression and the diversity gain. An optimization problem is formulated by exploiting only long-term channel state information instead of instantaneous one. Then, it is solved based on the minimum mean square error criterion with a constraint on the transmit power. Computer simulation results show that the proposed scheme outperforms the conventional beamforming scheme.

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  1. DoCoMo Communications Laboratories Europe GmbH, Landsberger Strasse 312, 80687, Munich, Germany

    Katsutoshi Kusume

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  1. Katsutoshi Kusume
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Correspondence to Katsutoshi Kusume.

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Kusume, K. Linear Space-Time Precoding for OFDM Systems Based on Long-Term Channel State Information. Int J Wireless Inf Networks 12, 225–233 (2005). https://doi.org/10.1007/s10776-005-0009-7

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  • DOI: https://doi.org/10.1007/s10776-005-0009-7

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