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工程科学与技术:2012,44(6):116-119
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下行多用户MIMO系统中低复杂度块对角化预编码算法
(重庆大学 通信工程学院)
A Low Complexity Block Diagonalization Precoding Algorithm for Multiuser MIMO Downlink Systems
(College of Communication Eng.,Chongqing Univ.)
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投稿时间:2012-04-12    修订日期:2012-06-20
中文摘要: 为在保证误码性能的情况下降低块对角化预编码算法计算复杂度,提出一种基于矩阵伪逆与LDL^H分解的多用户多输入多输出(MIMO)系统块对角化(BD)预编码改进算法LDL^H-BD(QR)。算法通过全局信道矩阵伪逆与块QR分解进行零空间计算,避免复杂的矩阵奇异值分解(SVD),快速实现信道块对角化。并采用能提供均匀子信道增益的LDL^H方式对等效信道进行优化分解,实现预编码矩阵设计。仿真结果表明该算法计算复杂度明显降低,并获得了与传统块对角化算法相近的误码率性能。
Abstract:To reduce the computational complexity of block diagonalization precoding algorithm and ensure the BER performance,a block diagonalization precoding algorithm,named as LDL^H-BD(QR),was proposed for multiuser multi-input multi-output (MIMO) systems,based on pseudo inverse and LDL^H decomposition.Firstly,computational complexity was reduced by combining global channel matrix pseudo-inverse and QR decomposition. Therefore,channel block diagonalization was fast finished. Furthermore,the LDL^H decomposition which has moderate subchannel gains uniformity was applied to optimize the equivalent channel for each single-user,so that procoding matrix was completed. Simulation results showed that the proposed algorithm has less computational complexity and similar bit error rate performance as the traditional block diagonalization algorithm.
文章编号:201200260     中图分类号:    文献标志码:
基金项目:国家自然科学基金资助项目(60872038);中央高校基本科研业务费专项资助项目(CDJXS12160008)
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吴玉成,刘阳,潘怡瑾.下行多用户MIMO系统中低复杂度块对角化预编码算法[J].工程科学与技术,2012,44(6):116-119.
Wu Yucheng,Liu Yang,Pan Yijin.A Low Complexity Block Diagonalization Precoding Algorithm for Multiuser MIMO Downlink Systems[J].Advanced Engineering Sciences,2012,44(6):116-119.