认知系统中基于有限感知与混合保护的功率分配策略

An efficient power allocation method based on limited sensing area of secondary user and mixed protection measures of primary user

研究了频谱共享环境中,一种基于认知用户有限感知区域与主用户混合保护措施的功率分配方法,在考虑主用户占用子信道概率的情况下,通过建立认知系统的多区域模型,提出了适应于主用户存在与否两种不同情况下的干扰避免策略。在满足认知用户自身最大功率约束与主用户混合干扰功率约束的条件下,基于最大化认知系统传输速率的目标,提出了各子信道集合的和功率以及不同集合内功率分配的联合优化方法,且复杂度较低。仿真结果表明,本文所提方法在不同参数设置下均达到了较好的速率性能,且远远超过机会频谱接入方式所获得的最大传输速率。

In this paper,an efficient power allocation method based on limited sensing area of secondary user and mixed protection measures of primary user is studied.Considering the subchannel occupancy probability of primary users,the authors found the multi-area model of cognitive system and propose the mixed interference avoidance principle of different situations.Based on the objective of maximizing the transmission rate of cognitive system,a low complexity method which jointly optimizes the sum power of different subchannel sets and the power inside each subchannel set is developed.Simulation results show that joint optimizing method can achieve great rate performance with different parameter settings and beyond the maximum rate achieved by the opportunistic spectrum access mode.