Abstract: In this paper, it proposes a novel primary user positioning algorithm RSS-IWLS-based to estimate the position and transmission power of the primary user at the same time in cognitive radio systems. The proposed algorithm considers the practical factors not only path loss but also shadowing effect and channel noise that affect the estimation accuracy. The simulation results show that the proposed algorithm is better than RSS-LS algorithm in estimation accuracy.

Key words: cognitive radio system, primary user positioning, received signal strength, weighted least square algorithm

摘要： 在认知无线电系统中，主用户定位是执行无线传输场景分析，进而共享主用户频谱资源，提供基于位置辅助业务的前提条件。针对主用户发射信号功率未知情况，提出一种基于接收信号强度的改进加权最小二乘（RSS-IWLS）算法实现在对主用户定位的同时估计其发送功率。该算法综合考虑路径损耗、阴影效应和信道噪声对定位精度的影响。仿真结果表明，执行RSS-IWLS算法获得的主用户位置估计精度比基于接收信号强度的最小二乘算法更高。

关键词: 认知无线电系统, 主用户定位, 接收信号强度, 加权最小二乘算法