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中文摘要：
采用收发结合的分组迫零算法实现多用户共道干扰抑制．通过收发结合减少基站所需天线数，增大等效信道增益；通过用户分组，利用求解各用户组信道矩阵零空间交集的方法降低计算复杂度．仿真结果表明，与基本迫零算法相比，改进迫零算法应用于最小化系统功率问题，在不同速率及误比特率条件下，不仅减小了基站所需天线数及计算复杂度，而且系统所需总功率降低．
英文摘要：
In muhiuser MIMO-OFDM systems, different users sharing the same subcarriers to transmit introduced eochannel interference（CCI）. This made the BER of systems decrease heavily. As to the downlink, a new grouping zero forcing algorithm which coordinated transmitter-receiver processing was proposed to mitigate CCI. Jointing Tx - Rx processing decreased the number of antennas and increased the channel equivalent gain. Through grouping users and solving null space intersection of user groups＇ channel matrices, the computation complexity decreased. Simulation results show that, compared with classic zero forcing algorithm, the improved zero forcing algorithm, in different data rate and system BER limit, can decrease the required antenna number and computation complexity, and reduce the required overall power too.
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