认知无线电双向中继网络的性能研究

Performance of Cognitive Radio Employing Two-way Relay

论文研究的认知无线电网络包括一对主用户,一对辅用户和一个授权给主用户的中继结点。辅用户使用主用户的中继在主用户的频带上机会性的传输数据。主用户和辅用户都工作在双向中继模式。当主用户不发射数据时,一对辅用户在第一相同时向中继发送数据;在第二相,中继放大叠加的接收信号并将它们广播给一对辅用户。辅用户可以通过提取自身干扰后译出对方的信号。然而,在漏检的情况下,主用户和辅用户将会在第一相同时向中继发送数据从而相互产生干扰,这就会降低主网络的性能。论文将对一定目标检测概率条件下辅网络的中断概率和性能进行研究。

Cognitive radio(CR)network involving a pair of primary users(PUs),a pair of secondary users(SUs)and a relaynode authorized to the PUs is investigated. The SUs using the PUs relay opportunistically transmit in the frequency bands of the PUs.Both the PUs and the SUs work on two-way relaying mode. In absence of PUs,SUs transmit to the relay simultaneously in the firstphase;in the second phase,relay scales the superimposed received signals and broadcast it to SUs. SUs can decode the counter-parts' signal after subtracting the self-interferences. However,in the situation of miss detection,PUs and SUs will transmit simulta-neously to the relay in the first phase and they will interfere to each other,which will decrease the primary network performance.Subjected to a target probability of detection,outage probability,performances of the secondary networks are analyzed in the paper.