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http://dx.doi.org/10.3837/tiis.2016.01.004

Adaptive Adjustment of Compressed Measurements for Wideband Spectrum Sensing  

Gao, Yulong (Harbin Institute of Technology Communication Research Center)
Zhang, Wei (Harbin Institute of Technology Communication Research Center)
Ma, Yongkui (Harbin Institute of Technology Communication Research Center)
Publication Information
KSII Transactions on Internet and Information Systems (TIIS) / v.10, no.1, 2016 , pp. 58-78 More about this Journal
Abstract
Compressed sensing (CS) possesses the potential benefits for spectrum sensing of wideband signal in cognitive radio. The sparsity of signal in frequency domain denotes the number of occupied channels for spectrum sensing. This paper presents a scheme of adaptively adjusting the number of compressed measurements to reduce the unnecessary computational complexity when priori information about the sparsity of signal cannot be acquired. Firstly, a method of sparsity estimation is introduced because the sparsity of signal is not available in some cognitive radio environments, and the relationship between the amount of used data and estimation accuracy is discussed. Then the SNR of the compressed signal is derived in the closed form. Based on the SNR of the compressed signal and estimated sparsity, an adaptive algorithm of adjusting the number of compressed measurements is proposed. Finally, some simulations are performed, and the results illustrate that the simulations agree with theoretical analysis, which prove the effectiveness of the proposed adaptive adjusting of compressed measurements.
Keywords
Wideband Spectrum Sensing; Compressed Sensing; Adaptive Compressed Measurement; SNR of the Compressed Signal;
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