认知无线网络中双中继协作策略及其差错性能分析

在认知无线网络中同时存在着主用户和次用户,次用户的通信必须在保证主用户不受干扰的条件下进行,次用户在检测到主用户未占用授权频段时机会地占用信道进行数据传输.为了保证次用户传输的连续性及QoS,研究人员在认知无线网络中引入了协作通信技术,研究发现认知无线电中的协作传输能够显著改善网络的传输性能.提出一种次用户双中继协作次用户的协作传输策略,并给出了该策略下平均误比特率和中断率的解析表达式,为了进行比较同时给出了单中继协作策略下次用户平均误比特率及中断率的表达式.理论分析和仿真结果表明,双中继协作次用户策略较单中继协作次用户策略有效地提高了次用户的差错性能.

Dual-relay cooperation scheme and its BER performance analysis in cognitive wireless networks

Primary users and secondary users coexist in cognitive networks at the same time, so the transmission of Secondary Users must not interfere with the communication of primary users. When secondary users detect the licensed bands are not occupied by primary users, secondary users occupy the channel for data transmission at random. In order to make sure of the continuity and QoS of transmission of the Secondary users, the authors introduce the strategy of cooperative transmission in cognitive networks. The study found that the cooperative communication in cognitive radio can significantly improve transmission performance of the network. Based on it, the article puts forward a dual-relay cooperative transmission strategy and gives out the analytical expression of average bit error rate and outage probability under the scheme. For comparison, the analytical expressions of bit error rate and outage probability under single-relay cooperative transmission scheme are given. Theoretical analysis and simulation results show that, the error performance of secondary users under two-relay cooperative transmission strategy is better than that under single-relay cooperative transmission strategy.