A Low-Complexity Design of Linear Precoding for MIMO Channels with Finite-Alphabet Inputs

This paper investigates linear precoding scheme that maximizes mutual information for multiple-input multiple-output (MIMO) channels with finite-alphabet inputs. In contrast with recent studies, optimizing mutual information directly with extensive computational burden, this work proposes a low-comp...

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Bibliographic Details
Published inIEEE wireless communications letters Vol. 1; no. 1; pp. 38 - 41
Main Authors Zeng, Weiliang, Xiao, Chengshan, Lu, Jianhua
Format Journal Article
LanguageEnglish
Published IEEE 01.02.2012
Subjects
Fading
finite-alphabet inputs
Linear precoder
low-complexity design
MIMO
Mutual information
mutual information maximization
Optimization
Phase shift keying
Signal to noise ratio
Vectors
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Summary:This paper investigates linear precoding scheme that maximizes mutual information for multiple-input multiple-output (MIMO) channels with finite-alphabet inputs. In contrast with recent studies, optimizing mutual information directly with extensive computational burden, this work proposes a low-complexity and high-performance design. It derives a lower bound that demands low computational effort and approximates, with a constant shift, the mutual information for various settings. Based on this bound, the precoding problem is solved efficiently. Numerical examples show the efficacy of this method for constant and fading MIMO channels. Compared to its conventional counterparts, the proposed method reduces the computational complexity without performance loss.
ISSN:2162-2337
2162-2345
DOI:10.1109/WCL.2012.121411.110025