认知无线电中对干扰信号源的定位

Location of interfering signal source in cognitive radio

当认知用户接入主用户系统时将对主用户产生干扰。确定产生干扰的认知用户的位置能更好地进行基站布署,从而最大限度地避免这种干扰,使频谱得到有效利用。本文主要给出了一种改进的MUSIC算法对相干的干扰认知用户进行定位,即利用前后向空间平滑的修正矩阵进行矩阵的重构,再分解其重构矩阵,最后利用波束空间的MUSIC算法减少谱峰搜索中的计算量。通过计算机仿真证明了此方法的有效性。

When cognitive users access the primary users＇ system,primary users would be interfered.Finding the cognitive users＇ location where interference generated is beneficial to deployment of base station,thereby avoiding the interferences and improving the spectrum efficiency.An improved MUSIC algorithm is proposed to locate coherent cognitive users in this paper.Take advantage of forward and backward spacesmooth modifiedmatrix,restructuringmatrix is obtained and decomposed.Beam space MUSIC algorithm is utilized to reduce the computation of peak search.Simulation results illustrate the efficiency of the new algorithm.