Cognitive radio and cooperation communication are two attractive techniques to improve the spectrum utilization. We study the achievable rate of an underlying cognitive two-way relay network. A two-slot two-way relay scheme using successive interference cancellation and network coding techniques is considered to better utilize the insufficient spectrum resource of the cognitive relay network.Optimal power allocation and time division of this scheme are proposed to achieve fairness and maximize the minimum end-to-end transmit rate of bidirectional communications in the network. Numerical results verify the superiority of the proposed scheme over existing schemes in the practical strongly restricted cognitive radio environment.%认知无线电和协同通信是两种改善频谱利用率的新技术.本文研究中继辅助的潜伏式认知无线电双向通信的可达速率.为了更有效地使用认知无线电可用而不丰富的频谱资源,本文针对一种结合逐级干扰消除和网络编码的双时隙双向中继方案,考虑公平性以最大化双向通信均可达到的端到端速率为目标,给出了其最优功率和时隙分配方法.仿真结果表明采用所提出的功率和时隙分配的双向中继方案在实际资源严格受限的认知无线电环境中优于现有的双向中继方案.
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