Tomlinson-Harashima Precoding with Adaptive Modulation
for Fixed Relay Networks



Taiwen Tang, Chan-Byoung Chae, Robert W. Heath Jr., and Sunghyun Cho


Proc. of IEEE Workshop on Signal Processing Advances in Wireless Communications, July, 2-5, 2006 (Canne, France)


In this paper, a novel relaying strategy that uses multiple input multiple output (MIMO) fixed relays with linear processing for multiuser transmission in cellular networks is
proposed. This strategy applies to the two hop relaying scenario for coverage enhancement, where the base station transmits data to multiple users through one fixed relay (multiuser transmission). The fixed relay processes the received signal with linear operations and forwards the processed signal to multiple users. We propose an implementable multiuser precoding strategy that combines Tomlinson-Harashima precoding at the base station and linear signal processing at the relay with adaptive stream selection and QAM modulation. We propose a reduced complexity algorithm to select a subset of users. Simulations illustrate the sum rate using Tomlinson-Harashima precoding without coding.

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