主用户活跃性下的多功率分配策略

考虑到认知用户在信息传输过程中主用户的状态可能随时变化，提出了一种新的功率分配模式——多功率分配策略。在基于频谱感知的系统模型中，以认知系统的吞吐量为目标函数，得出了主用户感知过程的多种状态，并分配三种不同的功率，最大化认知系统的容量。仿真结果表明，随着主用户活跃指数的逐渐提高，所提新模型的功率分配策略要优于传统方法。同时分析了新的功率分配下平均干扰功率与主用户接收端的信噪比对系统吞吐量和最优感知时间的影响，进一步验证了所提出新策略的有效性。 〖HT5H〗关键词：〖HT5K〗认知无线电；主用户活跃；频谱感知分配；多功率分配；吞吐量最大化

Multi-power allocation strategy in the condition of primary user traffic

In consideration of the state that the main user of cognitive users may vary at any time in the process of information transmission,a new power allocation model called multi-power allocation strategy is put forward. In the system model based on spectrum sensing,the throughput capacity of cognitive system is regarded as the objective function to get many states of the cognitive process of the main user. In addition,three different powers are distributed and the capacity of cognitive system is maximized. Simulation result indicates that the power allocation strategy of new model is better than that of traditional method following the gradual rise of the traffic index of the main user. At the same time,the influence of average interference power and the signal-to-noise ratio of the receiving terminal of the primary user on the throughput capacity of cognitive system and the optimal cognitive time in the new power distribution is analyzed. In this way,the effectiveness of the new strategy is further verified.