对于每个用户均配置两根天线的X信道,提出了一种新的空时码传输方案.每个用户采用速率为2的空时分组码(R2-STBC),通过合理地设计R2-STBC的发送方式和预编码,使接收端对接收信号进行线性处理后消除了多用户干扰.与相同场景中已有的空时码传输方案相比,所提方案不但节省了反馈量,还提高了传输效率.仿真结果显示,所提方案的可靠性显著优于相同场景中的已有方案. A new space-time code transmission scheme is proposed for each user to configure X-channels of two antennas. Each user uses a space-time block code (R2-STBC) with a rate of 2 and designs R2-STBC And the precoding, so that the receiving end of the received signal linear processing eliminates multi-user interference.Compared with the existing space-time code transmission scheme in the same scenario, the proposed scheme not only saves the amount of feedback, but also improves the Transmission efficiency.The simulation results show that the proposed scheme is significantly more reliable than the existing schemes in the same scenario.