中文摘要：

为了进一步提高协同通信系统中断性能，引入了定向天线技术。在传统双向AF协同通信技术的基础上，提出适用于基于定向天线的双向单中继AF协同通信协议，并从理论上推导其中2种即TDBC和OSS的系统在全定向模式下的中断概率下界。仿真结果表明，在高信噪比或者2个终端到中继的信道系数相差较大的条件下，该下界和精确值很紧；OSS方式中断性能优于TDBC；在频谱效率不高的情况下，全定向协同通信中断性能优于传统方式。因此在通常情况下全定向模式的协同通信系统中断性能得到了提升，在实际应用中应尽量采用OSS协议以充分发挥其优势。

英文摘要：

Directional antenna technique is adopted to enhance the outage performance of cooperative com- munication. Protocols which are suitable to bidirectional single relay AF cooperative communication based on directional antenna is proposed on the basis of the traditional Protocols and the outage probability low bound of TR-BF TDBC and OSS systems are derived theoretically. Simulation results show that the de- rived low bound and the exact value are very tight when SNR is high or the channel coefficients from two ends to relay vary widely. The outage performance of OSS is better than that of TDBC,and the outage per- formance of TR-BF AF cooperative communication is better than that of the traditional one when spectral efficiency is not very high. Usually, the outage performance of cooperative communication system with full directional mode is improved, and OSS protocol should be adopted as far as possible in practical applica- tions in order to fully gain best of its advantages.