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arXiv 1010.2157cs.ITmath.IT
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一种基于欠采样的认知无线电宽带频谱感知方法

A Wideband Spectrum Sensing Method for Cognitive Radio using Sub-Nyquist Sampling

Moslem Rashidi, Kasra Haghighi, Arash Owrang, Mats Viberg

摘要:

频谱感知是认知无线电的一个基本组成部分。该领域的主要挑战是在宽带信号的感测中需要高采样率。本文提出了一种宽带频谱感知模型,该模型采用欠采样方案,在采样率方面节省了大量资源。有限数量的噪声样本的相关矩阵的计算和使用的子空间估计器来检测占用和空闲的频谱信道。与常用的方法相比,该方法不需要信号特性的知识,从而减轻了不确定性问题。我们评估这种方法的性能,通过计算检测信号占用的样本数和随机生成的信号的SNR的概率。结果表明,即使在低信噪比和小样本数的可靠检测。

英文摘要:

Spectrum sensing is a fundamental component in cognitive radio. A major challenge in this area is the requirement of a high sampling rate in the sensing of a wideband signal. In this paper a wideband spectrum sensing model is presented that utilizes a sub-Nyquist sampling scheme to bring substantial savings in terms of the sampling rate. The correlation matrix of a finite number of noisy samples is computed and used by a subspace estimator to detect the occupied and vacant channels of the spectrum. In contrast with common methods, the proposedmethod does not need the knowledge of signal properties that mitigates the uncertainty problem. We evaluate the performance of this method by computing the probability of detecting signal occupancy in terms of the number of samples and the SNR of randomly generated signals. The results show a reliable detection even in low SNR and small number of samples.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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