基于非线性预编码的多载波分层空时检测方法

摘要

针对多载波分层空时方案传统检测存在误层传输效应及复杂度高的问题,提出了一种基于非线性预编码的多载波分层空时检测方法.该方法首先对反馈信道状态信息采用几何均值分解获得各子信道具有相同等效噪声增益的预编码矩阵,再在发射端多载波CDMA子载波信道间进行非线性模代数THP预编码,可以有效地消除传统分层空时检测的误层传输效应,在接收端分别采用迫零与最小均方误差准则,降低了下行接收机的复杂度.对该方法的性能进行分析并仿真,仿真结果表明所提出的方法比传统方法有效改善了系统的误码性能,并在一定程度上降低了接收机的复杂度.%Considering the error propagation effect and high complexity of vertical Bell Labs layered space time, proposed a novel detection method for multi-carrier spatial multiplexing systems based on nonlinear precoding. Used the geometric mean decomposition method for the channel precoding matrix which had the same equivalent noise gain among each sub-channel,and used the nonlinear module algebra THP precoding between sub-carrier channels of MC-CDMA to eliminate interference from other signals at the transmitter. This could effectively eliminate the error propagation effect of layered space-time codes.At the receiver, used ZF and MMSE criterion and the complexity of the downlink receiver could be reduced. Simulation results show that the proposed algorithm is better than the traditional algorithm in the BER.