机构地区: 华南理工大学电子与信息学院
出 处: 《桂林电子科技大学学报》 2007年第3期175-179,共5页
摘 要: 在多用户MIMO系统下行链路中,使用SDMA技术可以提高整个系统的容量。BD算法通过将多用户MI-MO信道块对角化,使整个多用户MIMO信道分解为独立并行的点对点MIMO等效信道,从而完全抑制了不同用户之间的多用户干扰(MUI)。以此为基础,提出了一种基于整个系统均方误差最小化(MMSE)的SDMA设计方法,该方法在下行链路总发射功率的约束下,可根据各用户等效信道的噪声功率,来动态的分配各用户的发射功率,联合优化基站端的编码滤波器和各用户端的解码滤波器。 Using the Spatial Division Multiple Access (SDMA) in the downlink can improve the capacity of a multiuser MIMO system. The BD (Block Diagonalization) algorithm can diagonalize a multi-user MIMO channel and decouple it into several parallel independent point-to-point MIMO channels, which can suppress the Multi User Interference (MUI) between the users completely. This paper proposes on the basis of the BD algorithm a design method for SDMA that can minimize the MSE of the system. With a constraint of the total transmission power of the downlink, the algorithm transmission allocates the power of each user dynamically according the noise power of each user and jointly optimizes both the encoding filter of base station and the decoding filter of each user.