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在解码转发多输入多输出双向中继系统中,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和平均误符号率(ASER)的闭合表达式.当已知完全CSI时,采用最大比发送最大比接收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和ASER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和ASER性能.
In the two-way relay system with multi-input and multiple-output decoding, two kinds of CSI are respectively designed, and the closed expression of the system outage probability and mean error symbol rate (ASER) is deduced. When the full CSI is known, the maximum ratio specific maximum receive technique is used to design the beamforming and merging vector. When the unknown CSI is not perfect, the transmission strategy based on the limited feedback is designed, and the random vector quantization and Grassmann two codebooks are used for numerical Simulation results show that the designed interrupt probability and ASER performance of the two-way relay transmission strategy are obviously superior to other strategies, and the closed expression can accurately characterize the system outage probability and ASER performance.