【摘要】 针对块对角化(BD)算法没有考虑各用户接收噪声功率差异的问题,在对下行链路信道实施块三角化(BT)的基础上,结合Tomlinson-Harashima非线性预编码(THP)提出了一种新的下行链路信道分解算法,使得分解后得到的各单用户等效信道具有不同的空间发射分集.该算法通过优先对"最差"的用户进行预编码使得该用户获得"最优"的等效信道.仿真实验结果表明该算法获得了比BD算法更好的系统性能.更多还原

【Abstract】 In the block diagonalization(BD) algorithm,the difference in received noise power between users is ignored.In order to solve this problem,a novel channel-decomposing algorithm for downlink is proposed by combining the block triangularization(BT) of downlink channel and the nonlinear Tomlinson-Harashima precoding(THP).By using the proposed algorithm,the downlink channel can be decomposed into several single equivalent channels with different spatial transmission diversities,and the "worst" user can obtain the "best" equivalent channel via precoding.Simulated results show that the proposed algorithm has better performance than the BD algorithm.更多还原