Iterative equalization algorithm based on precoding matrix

被引:0
|
作者
Li, Yi-Bing [1 ]
Liu, Hai-Tao [1 ]
Ye, Fang [1 ]
Lin, Yun [1 ]
机构
[1] College of Information and Communication Engineering, Harbin Engineering University, Harbin,150001, China
来源
Xi Tong Gong Cheng Yu Dian Zi Ji Shu/Systems Engineering and Electronics | 2015年 / 37卷 / 10期
关键词
Matrix algebra - Signal receivers - Antennas - Inverse problems - MIMO systems - Feedback control - Orthogonal frequency division multiplexing - Computational complexity - Signal interference - Transmitters - Bit error rate - Codes (symbols) - Equalizers - Iterative methods - Telecommunication repeaters;
D O I
10.3969/j.issn.1001-506X.2015.10.26
中图分类号
学科分类号
摘要
Aiming to co-antenna interference and multipath interference in the LTE downlink multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) asynchronous communication system, a low complexity iterative equalization algorithm based on precoding matrix is proposed. At the transmitter, the algorithm utilizes precoding matrix to spread the symbols over all the subcarriers, which relieves the influence of deep fading in part of the subcarriers. At the receiver, the algorithm adopts soft input soft output interference elimination algorithm based on the minimum mean square error sorted QR decomposition (MMSE-SQRD) to avoid the complexity of solving inverse matrix, which is always involved in the traditional parallel soft interference elimination algorithm based on minimum mean square error equalization. Utilizing a sorted QR decomposition of the channel matrix, on the other hand, the algorithm has the priority for detection transmission symbol with maximum noise-signal ratio to improve detection accuracy. Furthermore, the error of reconstructed signals is spread by the precoding matrix, which decreases the error propagation in iteration processing. Simulation results show that the performance of the proposed algorithm is improved compared with the existing 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 performance of the system is improved about 4 dB. ©, 2015, Chinese Institute of Electronics. All right reserved.
引用
收藏
页码:2358 / 2363
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