Ad hoc认知无线网络的主用户感知定位方案

Positioning scheme of primary users in ad hoc CR networks

为了对频谱资源进行合理的运用,在认知无线Ad hoc网络中,各次用户必须准确地对主用户信号进行感知,以防止恶意攻击者发起的模仿授权用户攻击。本文基于对信号的波达方向(DOA)估计,提出了一种存在系统误差下对主用户的感知定位算法,仿真证明,该方案能准确地对主用户信号进行定位;当信道环境恶劣、信噪比较低时,本文通过引入环境系数,提出了一种灵活性较好的协作加权检测策略。该策略中每个次用户都可以做出对主用户信号的最终判决,解决了以往协作感知方案中由于权力过分集中而引起的潜在安全性问题。

In order to make reasonable use of the spectrum in ad hoc cognitive radio networks, the CR users must judge whether the primary user exists accurately to prevent the PUE attack launched by malicious attackers. The article presents an algorithm based on the DOA estimation with the condition of systematic errors existing. The simulation results show that the scheme can be good to do the judgment of users. The paper also presents a new collaborative weighted detection strategy when the channel environment is harsh and has a low SNR using the environmental factor .In the strategy, each of the CR users can make the final judgment of the primary user signal. It solves the problem of excessive concentration of power in previous collaboration strategies.