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中文摘要：
在多输人多输出（MIMO）解码转发（DF）双向中继系统中，分别设计了两种信道状态信息（CSI）情况下的系统传输策略，并推导了系统中断概率的闭合表达式。当已知完全CSI时，采用（最大比发送一最大比接收）MRT-MRC技术设计波束形成和合并向量；当未知完全CSI时，设计了基于有限反馈的传输策略，并采用随机向量量化和Grassmann两种码本进行数值仿真验证。仿真结论显示，所设计的双向中继传输策略的中断概率性能明显优于其他策略，所推导的闭合表达式能准确地表征系统中断概率性能。
英文摘要：
In MIMO decode-and-forward （DF） two-way relay systems, we designed the transmission schemes and derived the closed-form expressions for the outage probability of the two-way relay system, based on two different scenarios of channel state informa- tion （CSI）. Assuming perfect CSI, we apply maximum-ratio-transmission and combining （MRT-MRC） technique to design the beamforming and combining vectors. Without perfect CSI, we design the transmission scheme with limited feedback, and verify the analytical results through two kinds of eodebooks, i. e. , random vector quantization and Grassmann. The simulation results show that, the proposed transmission schemes for the two-way relay system can outperform other transmission schemes in the performance of outage probability, and the accuracy of the derived closed-form expressions is also verified by the simulation results.
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