多用户多输入多输出-正交频分复用系统的一种子信道分配方案

A Simplified Sub-channel Allocation Scheme for Multiuser MIMO-OFDM Systems

针对多用户多输入多输出-正交频分复用(MIMO-OFDM)系统的下行链路,基于脏纸编码(DPC)和线性接收机,提出了一种简单的子信道分配方案.每个子载波上,各用户以其信道矩阵左奇异向量作为接收机;发射机已知所有用户的信道信息,通过贪婪DPC预编码,分配空间子信道;然后,根据各子信道增益进行注水功率分配获得最大的和速率信道容量.仿真表明,该方法可以实现接近Sato界的信道容量.

A simple sub-channel allocation scheme, based on dirty paper coding （DPC） and linear receiver, was proposed for the downlink of multiuser MIMO-OFDM systems. At each subcarrier, every user utilizes the left-singular vectors of its channel matrix as receiver. Assuming that the channel state information （CSI） for all the users is well known at the transmitter, greedy DPC precoding is applied to allocate the spatial sub-channels to users. Finally, water-filling power allocation is performed to achieve the optimum sum-rate capacity. The simulation results show that the proposed method can approach the Sato bound.