基于协作多点传输的非线性顽健预编码

Nonlinear robust precoding for coordinated multipoint transmission

提出了非线性顽健预编码算法,该算法利用下行信道误差的统计特性,重新设计了传统非线性预编码算法的前向矩阵、反馈矩阵以及缩放矩阵。计算机仿真表明当存在下行信道误差时,该算法的性能不仅优于传统的线性和非线性预编码,也优于现有的线性顽健预编码。此外,在协作多点传输中,用户具有不同的下行信道误差,这使现有的"best-first"排序算法失效。于是对该排序算法进行了改进,使其仍能降低非线性顽健预编码算法的平均误码率。

A nonlinear robust precoding algorithm was proposed, which redesigned the feedback matrix,the forward matrix and the scaling matrix of the traditional tomlinson-harashima precoding algorithm based on the statistical characteristics of the downlink channel state information errors. Simulation results show that the nonlinear robust precoding algorithm can achieve better performance than the traditional linear and nonlinear precoding algorithms when the downlink channel state information errors exist. Due to the different downlink channel state information errors between user equipments in the coordinated multi-point transmission, the traditional ＂best-first＂ ordering algorithm was invalid. So an improved ordering algorithm was proposed to reduce the average bit error rate of the nonlinear robust precoding algorithm.