TD-LTE-A系统下行多用户CoMP联合预编码算法  

Research on Co MP Joint Transmission for Downlink MU-MIMO in TD-LTE-A

作　　者：蔡振浩[1,2] 赵昆[1] 陈文[2] 

机构地区：[1]上海贝尔股份有限公司,上海201206 [2]上海交通大学电子工程系,上海200240

出　　处：《北京邮电大学学报》2015年第1期67-70,共4页Journal of Beijing University of Posts and Telecommunications

基　　金：国家科技重大专项项目(2012ZX03001010)

摘　　要：LTE-A中多点协作传输(Co MP)技术可以通过多点协作发送、协作干扰消除等策略提高系统容量,特别是能增强小区边缘用户的接收信干噪比(SINR),改善通信质量,为此,针对多用户Co MP(MU-Co MP)中多流联合发送波束成形算法设计问题,以接收信号平均SINR最大化作为目标函数,通过计算信道状态信息估计值以及多用户干扰、噪声的统计自相关矩阵,构造正则矩阵束,将最大化接收SINR的联合传输预编码矩阵求解问题转化为正则矩阵束的广义特征向量求解问题,设计的权重矩阵既对准最大增益的波束方向,又能有效抑制用户及流间干扰.计算机仿真验证了该Co MP预编码矩阵联合设计算法能获得协作波束成形增益,且具有较强的鲁棒特性.Coordinated multi-point transmission / reception（ Co MP） is favored in long term evolution advanced（ LTE-A） due to its capability in reducing the inter-cell interference and enhancing the throughput for cell-edge users significantly. Aiming at the downlink precoding matrix design for multi-user multipoint joint transmission,the maximization of the average received signal to interference plus noise ratio（ SINR） was formulated as optimization problem. By deriving the regularization matrix pencil with the statistical autocorrelation matrix of the prior channel state information matrix,the noise matrix,the multi-user interference matrix and the joint transmission precoding matrix design problem were further translated into the derivation of generalized eigen matrix. The resulting scheme to design the precoding vector maximizes the user equipment SINR by maximizing the beamforming gain and minimizing the multi-user interference and the inter-strings interference. Simulation confirms that the proposed precoding scheme offers significant throughput enhancement with coordinated beamforming gain,as well as good robustness.

关 键 词：多点协作 信道状态信息 波束成形 广义特征矩阵 

分 类 号：TN919.1[电子电信—通信与信息系统]