哈尔滨工程大学学报2016，Vol.37Issue(3)：455-460,6.DOI:10.11990/jheu.201501004
基于预编码的混合迭代均衡算法
Hybrid iterative equalization algorithm based on precoding matrix
摘要
Abstract
To address co⁃antenna and multipath interferences in the LTE downlink multi⁃input multi⁃output orthogo⁃nal frequency division multiplexing communication system, we propose a low⁃complexity hybrid iterative equaliza⁃tion algorithm. In a receiving terminal, the proposed algorithm utilizes a precoding matrix to spread symbols over all subcarriers, which relieves the influence of deep fading in some parts of the subcarriers. In a receiver, the soft in⁃terference elimination algorithm is adopted based on the minimum mean⁃square⁃error ( MMSE)⁃sorted QR decompo⁃sition to avoid complexity when solving an inverse matrix. This matrix is always involved in traditional parallel soft interference elimination equilibrium algorithms based on minimum mean square error ( MMSE) equalization. In ad⁃dition, using a channel arrangement, the soft interference elimination algorithm prioritizes the detection of transmis⁃sion symbols with a maximum noise⁃to⁃signal ratio ( SNR) to improve detection accuracy. Furthermore, the recon⁃structed signals is preprocessed by a precoding matrix, which decreases error propagation in iteration processing. Simulation results show that the performance of the proposed algorithm is better than that of existing iterative inter⁃ference cancelation algorithms. Specifically, when the system is equipped with four transmitters and four receivers, the bit error rate is 10-5 and the SNR is improved by approximately 0.7 dB.关键词
多输入多输出正交频分多址/最小均方误差排序QR分解/预编码矩阵/最小均方误差/turbo均衡Key words
multi-input multi-output orthogonal frequency division multiplexing/minimum mean square error sorted QR decomposition/precoding matrix/minimum mean square error/turbo equalization分类
信息技术与安全科学引用本文复制引用
李一兵,刘海涛,叶方,林云..基于预编码的混合迭代均衡算法[J].哈尔滨工程大学学报,2016,37(3):455-460,6.基金项目
国家自然科学基金资助项目（61301095，51374099）；黑龙江省自然科学基金资助项目（ F201345）；黑龙江省青年科学基金资助项目（ QC2012C070）． （）
