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。
In TDD-MIMO systems,the antenna correlation has a great impact on the system performance. In order to overcome this problem,a hybrid precoding scheme was proposed. In this scheme,the channel was estimated at the BS by a low complexity channel estimation method. Then,the correlation factor of the channel was calculated to select the proper precoding method. If the correlation factor was bigger than the threshold,the covariance-based precoding was employed. Otherwise,the LR-based precoding was employed.Simulation results showed that the proposed low-complexity precoding scheme can make full use of the characteristic of the two precoding methods in different correlation ranges,and improve the BER performance and capacity. The effectiveness of the proposed scheme was also verified by the simulation.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2015年第1期162-166,共5页
Journal of Sichuan University (Engineering Science Edition)
基金
国家自然科学基金资助项目(61301170)
