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Reduced-complexity linear and nonlinear precoding for frequency-selective MIMO channels

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4 Author(s)
Brehmer, J. ; Inst. for Circuit Theor. & Signal Process., Munich Univ. of Technol., Germany ; Dietl, G. ; Joham, M. ; Utschick, W.

Focusing on systems with simple non-cooperating receivers, we present an approach to reduce the complexity of multiuser precoding schemes for frequency-selective MIMO channels. The transmit Wiener filter (TxWF) and Wiener Tomlinson-Harashima precoding (THP) both provide attractive performances, but the complexity involved in their computation may be prohibitive. We develop a reduced-complexity multiuser multistage TxWF (MSTxWF) by applying the multistage decomposition known from receive processing to the TxWF. We show that the block-Lanczos algorithm can he used for efficiently computing the reduced rank MSTxWF. Moreover, we extend the MSTxWF approach to Wiener temporal THP, resulting in a reduced-complexity nonlinear precoding scheme. Simulation results demonstrate that both schemes can provide close to optimum performance at significantly reduced complexity.

Published in:

Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th  (Volume:5 )

Date of Conference:

26-29 Sept. 2004