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

A Low-Complexity Design of Linear Precoding for MIMO Channels with Finite-Alphabet Inputs
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有限字母输入的 MIMO 信道线性预编码的低复杂度设计

DOI:
10.1109/wcl.2012.121411.110025
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发表时间:
2012-02
影响因子:
6.3
通讯作者:
Jianhua Lu
Jianhua Lu
中科院分区:
计算机科学2区
文献类型:
--
作者:
Weiliang Zeng;Chengshan Xiao;Jianhua Lu

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本文研究了有限字母输入多输入多输出(MIMO)信道中最大化互信息的线性预编码方案。与最近的研究相比,直接优化互信息具有广泛的计算负担,这项工作提出了一个低复杂度和高性能的设计。它推导出一个下限,需要低的计算工作量和近似,与一个恒定的位移,各种设置的互信息。在此基础上,有效地解决了预编码问题。数值算例表明了该方法在恒定和衰落MIMO信道下的有效性。与传统方法相比,该方法在不损失性能的前提下,降低了计算复杂度。
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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