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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| Published in: | IEEE wireless communications letters Vol. 1; no. 1; pp. 38 - 41 |
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| Main Authors: | , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
IEEE
01.02.2012
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| Subjects: | |
| ISSN: | 2162-2337, 2162-2345 |
| Online Access: | Get full text |
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| Abstract | 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. |
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| AbstractList | 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. |
| Author | Chengshan Xiao Jianhua Lu Weiliang Zeng |
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| SubjectTerms | Fading finite-alphabet inputs Linear precoder low-complexity design MIMO Mutual information mutual information maximization Optimization Phase shift keying Signal to noise ratio Vectors |
| Title | A Low-Complexity Design of Linear Precoding for MIMO Channels with Finite-Alphabet Inputs |
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