基于模糊逻辑的频谱分配算法

Spectrum allocation algorithm based on fuzzy logic

提出一种在认知无线电中利用模糊逻辑进行频谱分配的新算法.先对每个认知用户根据其与认知用户基站的距离进行通信优先级划分.再利用每个认知用户的频谱利用率、移动速度、认知用户发射机与主用户接收机之间的距离进行模糊逻辑运算,得到该认知用户的频谱接入概率.定义认知用户的通信优先级与其频谱接入概率之积为基站收益,基站收益越大,该认知用户越易得到频带.仿真结果证实了该算法的可行性.

A novel algorithm based on fuzzy logic for spectrum allocation in the Cognitive Radio is presented in this paper. First, each cognitive user’s traffic priority is obtained according to the distance between the cognitive user and the Cognitive Radio Base Station（CR-BS）. Then,the spectrum utilization efficiency of each cognitive user,its relevant moving speed and the distance between the receiver of primary user and the transmitter of cognitive user are utilized to execute fuzzy logic operation by which the spectrum access probability of each cognitive user is obtained. CR-BS revenue is defined as the product of each cognitive user’s traffic priority and spectrum access probability. The greater the CR-BS revenue is,the more easily the cognitive user gets the spectrum band. Simulation results demonstrate the feasibility of this algorithm.