基于地理位置的频谱共享系统功率分配

针对次用户地理位置分布的随机性，提出一种基于地理位置的多信道underlay频谱共享模型，并设计了一种基于凸优化的功率分配算法以提高频谱资源利用率。首先根据不同地理位置的次用户对主用户干扰的差异，设计一种基于产出投入比的公平性信道分配准则，将复杂的多信道资源分配问题转化为单信道功率分配问题；继而采用一种基于凸优化的迭代寻优方式进行功率分配，最终获得次用户的系统信道容量。仿真结果表明，相比按接入时间先后分配信道的方法，基于地理位置的多信道underlay频谱共享模型可以获得更高的信道容量。

Power Allocation of Spectrum Sharing Based on Geographic Location

Based on the random location of the secondary user,a multi-channel underlay spec-trum sharing model based on geographic location is proposed and a power allocation algorithm based on convex optimization is proposed to improve the utilization of spectrum resources. First-ly,according to the user's different geographical location to the primary user interference,a fair channel allocation principle based on output input ratio is designed and the complex problem with multi-channel resource allocation is transformed into a single channel power allocation problem. Secondly, an iterative optimization method based on convex optimization is used for power allocation. The channel capacity of the system is obtained finally. The simulation results show that the multi-channel underlay spectrum sharing model based on geographic location can obtain a higher channel capacity.