基于主用户信息法的态势图构建研究

RESEARCH ON THE SITUATION MAP CONSTRUCTION BASED ON PRIMARY USER INFORMATION METHOD

针对认知无线网络CRN(Cognitive Radio Network)存在频谱空洞、信道冲突等问题,假设主用户发射功率未知的情况下,提出一种基于主用户信息的频谱感知态势图构建方法。该方法基于接收信号强度和最小二乘法建立定位模型,采用拉格朗日乘数法,获取主用户位置和发射功率等信息来构建态势图,帮助网络用户掌握网络状态。仿真结果表明,相比插值法构建频谱态势图,该方法构建的态势图精确更高,空频带被利用的可能性高,信道冲突概率小。

Aiming at the problem of spectrum holes and channel conflict in cognitive radio network, in this paper, we propose a spectrum situation m a p construction method based on the primary user information assuming that the transmission power of the primary user is unknown. The method is based on the received signal strength and the least squares method to establish the positioning model. The Lagrange multiplier method is used to obtain information such as the position of primary user and the transmission power to construct the situation m a p to help the network users master the network state. The simulation results show that the proposed method is more accurate and higher than the interpolation method, and the probability of using the empty frequency band is high and the probability of channel conflict is small.