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在共存式频谱共享的认知中继网络中,认知用户(次用户/非授权用户)的发送功率严格受限,使次用户的服务质量(QoS)无法得到保证。中断概率是衡量次用户性能的重要参数。该文分析了在接收端信噪比非独立的情况下采用“选择-最优中继译码转发”协议的多中继认知无线网络的中断概率,分别得到了广播阶段和中继阶段的中断概率的表达式,并推导了在授权用户(主用户)干扰受限的情况下中断概率的近似解。通过Monte Carlo仿真,验证了该理论分析。
In coexisting spectrum sharing cognitive relay networks, the transmit power of cognitive users (secondary users / non-authorized users) is strictly limited, so that the secondary users’ QoS can not be guaranteed. Interrupt probability is an important parameter to measure the secondary user’s performance. This paper analyzes the interruption probability of a multi-relay cognitive radio network adopting the “Select-Optimal Relay-Coding and Forwarding” protocol when the signal-to-noise ratio at the receiver is not independent, and obtains the broadcast phase and the relay Phase break probability expression and derive an approximate solution to the break probability in the case of restricted interference to authorized users (primary users). The Monte Carlo simulation verifies this theoretical analysis.