IEEE Transactions on Vehicular Technology,
vol. 56, no. 2, Mar. 2007, pp. 652-660.
Joint Interference Cancellation and Channel
Shortening in Multi-User MIMO Systems
Robert W. Heath, Jr.,
Brian L. Evans
Wireless Networking and
The University of Texas at Austin,
Austin, TX 78712 USA
In this paper, a two-stage receiver structure for interference
cancellation in multi-user spatially-multiplexed multiple-antenna
systems is presented.
A space-time equalizer is used in the first stage for joint
coantenna/cochannel interference suppression and shortening of the
effective channel for each transmit stream of the desired user.
The channel shortening, combined with independent detection,
helps reduce the complexity of the second stage Viterbi equalizer,
which is used for separate intersymbol interference equalization for
each of the streams.
Three objective functions are proposed for determining the coefficients
of the space-time equalizer using a direct training data-based approach,
which does not require estimation of the interferer's channel.
Simulation results show good symbol error performance as compared to
existing algorithms with asynchronous MIMO interferers.
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