Abstract: This paper discusses and compares two different schemes in MIMO multiple relay wireless communication system，and the schemes are widely discussed in single relay system.Then it employs dirty paper coding at the base station and achieves the sum rate with the relay design，neglecting the direct links from the base station to the users.Finally it simulates the performance and compares the results.

摘要： 针对多中继MIMO无线通信系统，分析了多中继纯两跳情况下的中继处理方法，并将单中继多用户系统中的中继处理技术推广到多中继情况，同时应用脏纸编码算法，分别得到了两种中继处理技术下的信道容量，最后对它们的性能进行了仿真和比较。