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提出了一种新的基于认知用户通信效用的频谱共享算法,研究传输功率和比特误码率受限情况下的频谱分配问题。详细分析了瑞利衰落模型下的认知用户效用函数及其优化问题,在此基础上给出了一种基于注水线不断调整的功率分配机制,进而获得了认知用户的最优通信效用,并将该机制应用到频谱分配中,提出了一种基于“二分法”的频谱分配算法。研究中分别考虑了三种不同的优化模型,理论和仿真分析表明,“最大化比例公平”模型在保证用户之间频谱分配公平性的同时能够获得接近“最大化系统总效用”模型的通信总效用。
A new spectrum sharing algorithm based on cognitive user communication utility is proposed to study the spectrum allocation problem with limited transmit power and bit error rate. A detailed analysis of the cognitive user utility function and its optimization under the Rayleigh fading model is given. Based on this, a power allocation mechanism based on the continuous adjustment of the waterflood line is given, and the optimal communication utility of the cognitive user is obtained. And this mechanism is applied to the spectrum allocation, and a spectrum allocation algorithm based on “dichotomy ” is proposed. Three different optimization models were considered in the study. The theoretical and simulation results show that the “maximization of proportionality fairness” model can get close to “maximize the total system utility” while ensuring the fairness of spectrum allocation among users. The total communication utility of the model.