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一种TDD-MIMO系统混合预编码传输机制
引用本文:刘帅,孙德春,易克初,杨宏.一种TDD-MIMO系统混合预编码传输机制[J].四川大学学报(工程科学版),2015,47(1):162-166.
作者姓名:刘帅  孙德春  易克初  杨宏
作者单位:西安电子科技大学
基金项目:自适应传输MIMO系统中的信道预测技术研究,61301170
摘    要:针对TDD-MIMO系统中,天线之间存在相关性时会影响系统性能的问题,提出一种混合预编码传输机制.在该机制中,基站首先采用一种低复杂度的信道估计算法来计算信道矩阵,然后计算信道矩阵的相关度来判断相关性的高低并选择相应的预编码方式.当相关度大于等于转换系数时,采用基于协方差矩阵的预编码;反之,则利用基于LR的预编码.仿真结果表明,该机制充分利用了2种预编码分别适用于不同相关性范围的特点,在降低了系统的误码率的同时保持了低复杂度,提高了系统在天线之间存在相关性时的容量.仿真验证了该机制的有效性.

关 键 词:基于时分双工的多天线系统  相关性  互易性  混合预编码传输
收稿时间:2014/7/12 0:00:00
修稿时间:2014/10/8 0:00:00

A TDD-MIMO Transmission Scheme with Hybrid Precoding
Liu Shuai,Sun Dechun,Yi Kechu and Yang Hong.A TDD-MIMO Transmission Scheme with Hybrid Precoding[J].Journal of Sichuan University (Engineering Science Edition),2015,47(1):162-166.
Authors:Liu Shuai  Sun Dechun  Yi Kechu and Yang Hong
Affiliation:State Key Lab. of Integrated Services Networks,Xidian Univ.;State Key Lab. of Integrated Services Networks,Xidian Univ.;State Key Lab. of Integrated Services Networks,Xidian Univ.;China Academy of Space Technol.
Abstract:In TDD-MIMO systems, the antenna correlation has a great impact on the system performance. Accordingly, this paper proposed a hybrid precoding scheme as a promising approach to mitigate such impact. In our design, the precoding modes determined according to the correlation factor, which was estimated at the BS through a low complexity channel estimation method. Specifically, if the correlation factor is bigger than the threshold, the covariance-based precoding is adopted; otherwise, LR-based precoding is utilized. Simulation results showed that the proposed low-complexity precoding scheme can make full use of the superiority of the two precoding modes in different correlation range, and improve the BER performance. The results verified the effectiveness of the proposed scheme.
Keywords:TDD-MIMO systems  Correlation  Reciprocity  Hybrid precoding transmission
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