Multi-Stream Interference Cancellation for MIMO-OFDM Systems with Outdated Channel State Information


Etienne Auger, Carlo Mutti, Marc Kuhn, and Armin Wittneben


3rd COST 289 Workshop, Aveiro, Portugal, July 2006.

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Orthogonal frequency-division multiplexing (OFDM) with multiple-input multiple-output (MIMO) is part of the upcoming IEEE 802.11n standard. Systems compliant with this standard will deal with multi-stream interference (MSI) due to the several antennas and with inter-symbol interference due to the frequency selectivity of the channel. Channel precoding has turn out to be a robust technique for multi-stream interference cancellation (MSIC) with perfect channel state information (CSI) at the transmitter. However, in real wireless systems many factors can cause the CSI at the transmitter to be unreliable. In this paper we propose an iterative MSIC scheme minimizing the symbol-error rate of a precoded MIMO-OFDM system with outdated CSI at the transmitter. Numerical results in a slowly time-varying environment indicate that a significant performance improvement results from the proposed MSIC scheme.


MIMO-OFDM, multi-stream interference, time domain precoder, outdated channel state information, interference cancellation

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