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协作频谱感知中感知用户的选择与信噪比估计算法

DOI: 10.13190/j.jbupt.2013.06.023, PP. 108-112

Keywords: 认知无线电,协作频谱感知,相关矩阵,信噪比估计,信道增益比

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Abstract:

为提高协作频谱感知的检测精度,提出了一种基于协作感知网络来选择感知用户和估计信噪比的算法.算法利用感知用户之间采样信号的相关特性,构造了相关矩阵,根据矩阵元素的性质估算出各感知用户的信道特性参数感知用户信道增益比、信噪比和噪声方差等.算法的实现仅仅基于感知用户的采样信号,无需借助于主用户的任何先验信息,因而具有极高的实用价值.同时简要分析了要实现该算法,感知用户数量必须大于等于3.通过仿真实验验证了不同条件下信噪比和信道增益比的估计效果.

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