Robust Tomlinson-Harashima Precoding

Conference: PIMRC 2005 - 16th Annual IEEE International Symposium on Personal Indoor and Mobile Radio Communications
09/11/2005 - 09/14/2005 at Berlin, Germany

Proceedings: PIMRC 2005

Pages: 5Language: englishTyp: PDF

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Dietrich, Frank A.; Utschick, Wolfgang (Institute for Circuit Theory and Signal Processing, Munich University of Technology, Arcisstrasse 21, 80290 Munich, Germany)

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 timevarying channel. We present a robust optimization of THP and a combined optimization of THP and channel estimation, which take into account the quality of CSI. They yield a significantly improved robustness towards errors in CSI.