延时受限流量系统中的预编码技术研究

摘要

In systems with delay constrained traffic, the Channel State Information at the Transmitter(CSIT) is obtained slot by slot. The precoder design exploiting this incomplete CSIT is studied in this paper. An Optimized(OPT) power allocation algorithm based on the quantization of received power and a suboptimal but much simpler Hybrid Power Allocation(HPA) algorithm are proposed. Numerical results verify the efficiency of the proposed designs. For example, in a system with delay constraint 4 slots, the OPT and HPA precoders improve the system performance by 6.1 dB and 5.8 dB respectively.%针对有限延时业务中发端信道状态信息(CSIT)只能逐时隙获得的问题,提出一种基于不完全CSIT的预编码器设计方法,其中包括基于接收功率量化的优化(OPT)搜索算法和次优低复杂度的混合功率分配(HPA)算法.仿真结果证明了该设计的有效性,在一个延时要求为4个时隙的系统中,与传统设计方法相比,OPT预编码器和HPA预编码器分别获得6.1 dB和5.8 dB的性能增益.