Paper Info
Title
Adaptively Regularized Compressive Spectrum Sensing from Real-Time Signals to Real-Time Processing.
Abstract
Wideband spectrum sensing is regarded as one of the key features in cognitive radio systems. Compressive sensing (CS) has recently become one of the promising techniques to deal with the Nyquist sampling rate bottleneck of wideband spectrum sensing. Theoretical analyses and simulation have shown that CS could achieve high detection probability and low false alarm for wideband spectrum sensing. However, implementation of CS on the real-time signals and real-time processing poses significant challenges due to the iterative nature of the CS algorithms. In this paper, we propose a novel adaptively regularized iterative reweighted least squares (AR-IRLS) algorithm to implement the real-time signal recovery on the CS based wideband spectrum sensing. The proposed algorithm moves estimated solutions along an exponential-linear path by regularizing weights with a series of non-increasing penalty terms, which significantly speeds up the convergence of reconstruction and provides high fidelity guarantee to cope with the varying bandwidths and power levels of occupied channels. The proposed algorithm presents robustness against different sparsity levels at low compressive ratio without degradation on the reconstruction performance, and is tested on the real-time signals over TV white space spectrum after having been validated on the simulated signals. Both the simulation and real-time experiments show that the proposed algorithm outperforms the conventional iterative reweighted least squares (IRLS) algorithms in terms of convergence speed, reconstruction accuracy, and compressive ratio requirement.
Year
Venue
Keywords
2016
IEEE Global Communications Conference
Cognitive radio,compressive sensing,wideband spectrum sensing,TV white space,nonconvex optimization,real-time processing
Field
DocType
ISSN
Convergence (routing),Wideband,White spaces,False alarm,Computer science,Robustness (computer science),Real-time computing,Nyquist rate,Compressed sensing,Cognitive radio
Conference
2334-0983
Citations 
PageRank 
References 
0
0.34
0
Authors
3
Name
Order
Citations
PageRank
Xingjian Zhang195.55
Yuan Ma2248.49
Yue Gao355852.83