针对MIMO空分复用系统中利用信道状态信息自适应选择最佳预编码方案能有效提高系统性能,提出了一种基于有限比特反馈的预编码联合优化算法.该算法以最优化理论为基础,得出一种基于有限比特反馈的联合功率控制和空分复用预编码的最优发射机结构,并以此结构为基础提出了一种基于MMSE准则的最优预编码码本设计算法.仿真结果表明,与已有基于等功率的码本设计方法相比,所提出的设计算法在没有增加反馈开销的情况下,进一步改善了系统性能.
In MIMO spatial multiplexing system, channel state information (CSI) is very useful for adaptive selection of the optimal precoding schemes which can enhance system performance effectively. This paper proposed a joint optimal precoding algorithm for MIMO system with limited feedback. Based on optimize theory, it proposes the optimal transmitter structure which combines power control with precoding, and also brings forward a novel MMSE criteria based codehook construction algorithm. The simulation results show that the proposed structure and codehook design algorithm outperform the previous equal power allocation based codehook.