基于多主用户活跃性的多功率认知接入策略

摘要

In most of the cognitive radio (CR) network scenarios,there are multiple primary users (PU) with intense traffic.A novel multi-PU multi-state CR access mechanism and the corresponding multi-power access strategy based on the primary user traffic were proposed to address this problem.The method enabled the secondary user (SU) to access the optimal channel and adopt an appropriate power to transmit data,which could maximize the throughput of the CR system.Numerical simulation results show that the proposed method can enable the SU to take advantage of the information and resource of the multi-PU.The method not only minimizes the interference to the primary user,but also improves the achievable throughput of the CR system.%针对大多数认知无线电场景中存在多个主用户,且具有较强活跃性的问题,提出了一种基于授权用户活跃性的多主用户多状态认知接入机制以及对应的多功率接入策略.该方法能够使认知用户选择最优的授权信道接入,并采用合适的功率进行传输,实现了认知系统吞吐量的最大化.数值仿真结果表明,该接入机制能够使认知用户充分利用多主用户信息和资源.与传统的功率接入方式相比,既能减小对主用户的干扰,又能提升认知系统的容量.