中文摘要：

该文研究了基于波束形成技术的双跳多输入多输出（MIMO）放大转发（AF）中继系统的中断概率,该系统在发射端、中继端和接收端都配置了多根天线。假设每条链路的发射端采用最大比传输（MRT）技术,接收端采用最大合并比（MRC）技术,该文得出了中继端受到同信道干扰时的信干噪比（SINR）,推导了基于固定增益中继方案的中断概率（OP）闭合表达式。计算机仿真结果不仅验证了性能分析的有效性,而且还分析了关键参数对系统性能的影响以及配置多天线带来的好处。

英文摘要：

The outage probability of a dual-hop MIMO Amplify-and-Forward（AF） relay network with beamforming technique is investigated, where the source, relay and destination are all equipped with multiple antennas. By supposing that the Maximal-Ratio-Transmission（MRT） and Maximal-Ratio-Combining（MRC） are applied at the transmitter and receiver of each hop, the output Signal-to-Interference-plus-Noise Ratio（SINR） of the dual-hop AF relay system with multiple Co-Channel Interferences（CCIs） and noise at the relay is obtained, and the new closed-form expression of Outage Probability（OP） is derived for the fixed-gain relaying system. The computer simulation results show the effectiveness of the performance analysis; meanwhile, the results are able to provide valuable insights on the effects of key parameters on the performance of the dual-hop AF relaying system, as well as the benefit of implementing multiple antennas.