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为了提高认知系统的性能,提出一种混合中继选择协议(HPRS).通过判断中继是否能正确解码源信号来决定中继采用何种协议转发数据,最终选取其中信噪比最大的中继作为最优中继,并推导了HPRS在高信噪比下中断概率的近似表达式及分集度.理论和仿真结果表明,放大转发中继选择(SAF)、解码转发中继选择(SDF)协议和HPRS均可获得空间满分集度,而HPRS的中断性能要优于SAF和SDF协议.
In order to improve the performance of cognitive system, a hybrid relay selection protocol (HPRS) is proposed, which decides which protocol the relay uses to forward data by judging whether the relay can decode the source signal correctly. Finally, As the best relay and deduce the approximate expression and diversity degree of HPRS interrupt probability under high signal to noise ratio.Theoretical and simulation results show that the performance of the proposed scheme is enhanced by the Forwarding Relay Selection (SAF), Decode Forwarding Relay Selection (SDF) Both the protocol and the HPRS obtain full spatial diversity, while the HPRS interrupt performance is superior to the SAF and SDF protocols.