有色噪声中一种新频谱检测器的设计

高效、可靠地检测到主用户的存在与否是认知无线电的一个重要环节.在实际生活中,观测噪声常为时间相关的高斯有色噪声,如果运用传统的基于高斯白噪声假设的频谱检测算法,检测性能将显著降低.该文以高斯有色噪声为背景,首先采用线性模型估计导频信号,然后根据估计的参数设计基于似然比的检测器,并推导得到了检测概率和虚警概率的解析式.仿真结果表明:在低信噪比下,与能量检测相比较,所提方案能有效地提高检测概率和检测速度.

Design of a new spectrum detector in colored noise

Efficient and reliable detection of primary users is an important technology for cognitive radio.In real life,the observation noise is time-dependent Gaussian colored noise and the use of Gaussian white noise for the traditional spectrum detection algorithm will result in lower detection performance.In this paper,Gaussian colored noise was used as the background,pilot signal was first estimated based on the linear model.Then based on the likelihood ratio detector,the expression of probability detection and ...