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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第4期    总第260期    2016年4月

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文章编号:1672-7207(2016)04-1196-07
基于预编码扩展的并行迭代均衡算法
李一兵,刘海涛,叶方

(哈尔滨工程大学 信息与通信工程学院,黑龙江 哈尔滨,150001)

摘 要: 针对长期演进技术(LTE)下行多输入多输出正交频分多址链路(MIMO-OFDM)中的天线间干扰和多径干扰的问题,提出一种低复杂度的基于预编码矩阵的迭代均衡算法。该算法通过预编码矩阵将发射信号扩展到所有子载波上,降低由天线引起的部分子载波干扰。在接收端,利用最小均方误差排序QR分解(MMSE-SQRD)软输入软输出干扰消除均衡算法,从而避免传统基于MMSE并行软干扰消除均衡算法中矩阵求逆运算,进而降低了算法复杂度。在接收端,同时通过预编码对重建信号中误差进行扩展,进而缓解在迭代干扰消除过程中的误差传播。研究结果表明:在2发2收场景下,当误码率为10-3时,本文算法经过5次迭代后信噪比相比于传统MMSE-SQRD的迭代算法提高4.4~5.0 dB。

 

关键词: 多输入多输出正交频分多址;Turbo均衡;软输入软输出;预编码

Parallel iterative equalization algorithm based on precoding extension
LI Yibing, LIU Haitao, YE Fang

College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China

Abstract:Aiming to co-antenna interference and intersymbol interference caused by multipath channel and intercarrier interference in the LTE downlink multiple input multiple output orthogonal frequency division multiple multiplexing (MIMO-OFDM) systems, a low complexity iterative equalization algorithm based on linear precoding was proposed. The transmission symbols were spread over all the subcarriers by precoding matrix, which relieved interference part of the subcarrier by the antenna. In the receiver, soft input soft output interference algorithm based on minimum mean square error sorted QR decomposition (MMSE-SQRD) was adopted to avoid the complexity of solving inverse matrix, which was involved in the traditional parallel soft interference elimination algorithm based on minimum mean square error (MMSE) equalization. At the same time, reconstruction error of the signal was spread by the precoding matrix, which decreased the error propagation in iteration processing. The results show that the performance of the proposed algorithm is improved compared with the traditional MMSE-SQRD iterative interference cancellation algorithm, that is, when the system is equipped with 2 transmitters and 2 receivers and the Bit error rate is 10-3, the signal noise ratio is improved about 4.4-5.0 dB.

 

Key words: multiple input multiple output orthogonal frequency division multiplexing(MIMO-OFDM); Turbo equalization; soft input soft output(SISO); precoding matrix

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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