基于GMD-DPC/THP的两组Alamouti非线性预编码系统

针对Alamouti空时块编码复用增益损失的问题，提出了两组Alamouti编码方案；在此基础上，为了改善系统的误码率（Bit Error Rate，BER）性能和简化接收端复杂度，提出将几何均值分解（Geometric Mean Decomposition，GMD）算法和非线性预编码技术相结合的两组Alamouti传输方案。本方案的设计方法为：首先等效出两组Alamouti空时块编码系统的信道矩阵；进而，通过GMD算法对等效信道矩阵进行收发端联合设计；最后，在发射端应用脏纸（Dirty Paper Coding，DPC）和Tomlinson-Harashima Precoding（THP）非线性预编码技术，消除发送信号间的干扰，从而使系统获得更好的误码率性能。通过仿真结果对比发现，提出的系统可以显著地改善误码率性能。

Two-Groups Alamouti Nonlinear Precoding System Based on GMD-DPC/THP

In order to solve the problem of multiplexing gain loss in Alamouti space-time block coding, this paper proposed a two-groups Alamouti transmission scheme. On this basis, in order to improve the bit error ratio (BER) with lower computational complexity at the receiver, this paper proposed a two-groups Alamouti transmission scheme by combining Geometric Mean Decomposition (GMD) algorithm and non-linear precoding technique. The design method of the proposed solution consists of three main operations. Firstly, obtain the effective channel matrix of two-group Alamouti transmission systems. Secondly, jointly design the transceiver with the obtained effective channel matrix by exploiting the geometric mean decomposition (GMD) algorithm. Finally, mitigate the inter-channel interference by utilizing non-linear precoding techniques of Dirty Paper Coding (DPC) and Tomlinson-Harashima Precoding (THP). The simulation results demonstrate that the proposed scheme is capable of significantly improving the achievable BER performance.