摘要
迫零波束成形是一种简单易行的多用户多输入多输出(MIMO)下行链路线性预编码算法,在用户数充分大时,可以获得接近多用户MIMO下行总速率容量的性能,但是其波束的构造对信道状态信息的精度也有很高的要求。对信道估计误差导致的系统总速率损失进行了建模分析,并得到总速率的2种近似表达式,进而在此基础上以最大化系统有效总速率为目标推导出最优的信道训练时长公式。通过仿真实验验证了此模型的合理性与准确性,对于实际系统的性能分析及设计具有一定的指导意义。
Zero-Forcing Beam-Forming is a simple downlink pre-coding algorithm for multi-user multi-input multi-output （MIMO） systems.It can approach the downlink capacity of multi-user MIMO when the user number is large enough.However, beam con- structing relies on the precision of channel state information.In this paper,the sum rate loss caused by channel state estimation error is analyzed to form two approximations of sum rate.Then the optimal training sequence length is deduced in order to maximize the effective sum rate.Finally, the correctness and accuracy of the analysis are verified by simulations, and the result is useful for the design of practical systems.
出处
《无线电工程》
2016年第5期25-28,102,共5页
Radio Engineering
基金
中国电子科技集团公司第五十四研究所发展基金资助项目(X1228156)
