Tomlinson-Harashima Precoding with Substream Permutations Based on the Bit Rate Maximization for Single-User MIMO Systems

Shigenori KINJO  Shuichi OHNO  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E98-A    No.5    pp.1095-1104
Publication Date: 2015/05/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E98.A.1095
Type of Manuscript: PAPER
Category: Communication Theory and Signals
Keyword: 
Tomlinson-Harashima precoding,  SU-MIMO,  zero forcing,  bit rate,  substream permutations,  

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Summary: 
In this paper, we propose a zero-forcing (ZF) Tomlinson-Harashima precoding (THP) with substream permutations based on the bit rate maximization for single-user MIMO (SU-MIMO) systems. We study the effect of substream permutations on the ZF-THP SU-MIMO systems, when the mean squared error (MSE) and the bit rate are adopted for the selection of the permutation matrix as criteria. Based on our analysis, we propose a method to increase the bit rate by substream permutations, and derive QR and Cholesky decomposition-based algorithms which realize the proposed method. Furthermore, to improve the error rate performance, we apply zero transmission to subchannels with low signal-to-noise ratios. Numerical examples are provided to demonstrate the effectiveness of the proposed THP MIMO system.