中文摘要：

针对多用户多输入多输出（Multi-user Multiple-input Multiple-output，MIMO）系统虽可获得很好的系统容量性能，用户间却彼此存在干扰的问题，提出了一种具有较低计算量的线性块对角化预编码算法，并进一步给出了发送端性能优化预处理算法，从而较好的消除用户间干扰，并充分利用多用户MIMO系统容量性能．所提算法可以获得相近的误码率性能，具有较低的计算量，较好的满足了无线通信系统实时性、快速性的要求．仿真结果验证了所提算法的有效性．

英文摘要：

Multi-user multiple-input multiple-output （MU-MIMO） system is an effective wireless communication system and can significantly increase spectral efficiency. In a downlink muhi-user MIMO system where a base station （BS） transmits to different usel~ simultaneously and in the same frequency band, however, processing is more challenging due to the lack of coolrdination among the users. To solve this problem, a effective precoding al- gorithm, which has low complexity is proposed in this paper. At the same time, a preprocessing scheme is ad- vised for the transmitter. The proposed algorithm can cancel the multi-user interference （MUI） and make full us- er of the spectral of MU-MIMO system. Compared with the traditional precoding algorithm, the proposed algo- rithm can get the similar bit error rate （BER）, has lower computational complexity, and meets the requirement of real-time and. rapidity of wireless communication system well. The simulation results show that the proposed al- g3rithm attains good performance and is efficiency.