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针对空间相关信道下的预编码码书设计问题,提出了接近工程实现的时变非整数非均匀码书,并提出了码书周期的概念,提供了等效码书大小和预编码性能之间的多种折中方案,统一了自适应非均匀码书和固定均匀码书.在码书周期较短时,即使空间相关系数估计不正确,选中的码书仍包括当前最优的预编码矩阵,时变码书近似等效为一个较大的固定码书.当信道的空间相关特征变化较快时,可使用较小的码书周期以保证时变码书的跟踪特性.
Aiming at the problem of precoding codebook design in space-dependent channels, a time-varying, non-integer non-uniform codebook is proposed which is close to the engineering implementation. The concept of codebook cycle is proposed to provide the equivalent codebook size and precoding performance , This paper unifies the adaptive non-uniform codebook and the fixed uniform codebook.When the codebook cycle is short, the selected codebook still includes the current optimal precoding matrix even if the spatial correlation coefficient is not correctly estimated , The time-variant codebook is approximately equivalent to a larger fixed-size codebook.When the spatially correlated features of the channel change rapidly, a smaller codebook period may be used to ensure the tracking characteristics of the time-variant codebook.