FD-MIMO下行系统中基于空时码下的联合选码方法

Joint Code Selection Method Based on Space-Time Code in FD-MIMO Downlink System

对于三维多输入多输出(Full-Dimension Multiple Input Multiple Output,FD-MIMO)下行系统,基站侧配备N根传送天线,用户端仅有单接收天线的场景,提出了基于空时码与联合选码结合的传送方案,以及低复杂度的解码方法。在充分利用空时码能够克服信道深度衰落的特性基础上,通过两次发送信息构建等价信道,从而实现线性解码。此外,还给出了基于此信道模型下的反馈开销的下限值及复杂度的分析。最后,对所提方案进行了仿真,其结果与理论分析一致。

For the 3D FD-MIMO(Full-Dimension Multiple Input Multiple Output)downlink system,where the base station is equipped with a root transmitting antenna and the user has only a single receiving antenna,a transmission scheme based on the combination of space-time code and joint code selection,as well as a low-complexity decoding method are proposed.On the basis of fully utilizing the fact that the space-time code has the characteristic of being able to overcome deep channel fading,an equivalent channel is constructed by sending information twice,thereby achieving linear decoding.In addition,an analysis of the lower limiting value and complexity of feedback overhead based on this channel model is also provided.Finally,the proposed scheme is simulated and the results are consistent with the theoretical analysis.