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Tomlinson-Harashima precoding (THP) for a system with multiple transmit antennas and non-cooperative receivers is considered (broadcast channel). Design of THP for this channel is typically based on complete CSI at the transmitter, which is not available in mobile wireless systems. For larger Doppler frequencies it even performs significantly worse than linear precoding or simple beamforming due to...
Tomlinson-Harashima precoding (THP) for a wireless system with multiple cooperative transmitters and non-cooperative receivers is considered (downlink channel). In the literature THP has been optimized for this channel assuming complete channel state information (CSI). But quality of CSI is generally poor at the transmitter due to the time-varying channel. We present a robust optimization of THP and...
We present linear and nonlinear robust transmit zero-forcing filters for the downlink of multiuser multiple-input single-output (MU-MISO) time-division-duplex (TDD) systems which are robust with respect to errors in the channel state information (CSI) arising from channel estimation and time lags in mobile communications. Based on a set of estimated CSI of previous uplink slots, we apply a conditional...
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