基于相关信道的多用户MIMO-OFDM下行链路资源分配

为了最小化多用户多输入多输出-正交频分复用(MIMO-OFDM)系统下行链路发射功率，基于相关信道，提出按用户空间相关性分组的子载波共享方式与独占方式相结合的资源分配算法．不同用户组共享全部子载波，利用基于各组边缘用户中心角导引向量的组迫零方法实现各用户组的共道干扰抑制；各组内用户以独占方式分配子载波、比特、功率．仿真结果表明，新算法在不同速率及误比特率时，系统所需功率小于独占方式及基本迫零共享方式，且频谱利用率高于独占方式，基站所需发射天线数及计算复杂度小于基本迫零共享方式．

A Resource Allocation Algorithm for Multiuser MIMO-OFDM Downlink with Correlated Channels

With the goal of minimizing the transmit power, an adaptive resource allocation algorithm is proposed for multiuser multiple input multiple output-orthogonal frequency division multiplexing (MIMO-OFDM) downlink with correlated channels. Based on the users’ grouping according to their spatial correlations, the algorithm joints a shared manner and an exclusive manner. In different groups, the shared manner with a null steering method based on the group marginal users is applied. And in the same group, the exclusive manner is applied. The simulations show that the power and the spectral efficiency are improved; the base station antenna number and the computational complexity are decreased.