Wide-Band Secure Compressed Spectrum Sensing for Cognitive Radio Systems

Abstract

Abstract-Cooperative wide-band spectrum sensing has been considered to enable cognitive radio operation of wireless regional area networks (WRAN) in the UHF and VHF TV broadcasting bands. In this paper, cooperative compressed spectrum sensing is considered to enable fast sensing of the wide-band spectrum. The speed and accuracy of spectrum sensing are improved by further optimization of the compressed sensing receiver, which is done blindly without any prior knowledge of the sensed signal. Enhanced compressed spectrum sensing algorithms are proposed for the cases of individual spectrum sensing and cooperative spectrum sensing. The cooperative signal reconstruction process is modified to optimally combine the received measurements at the fusion center. A low complexity authentication mechanism, which is inherent to cooperative compressed spectrum sensing, is proposed to make the cognitive radio system immune to adversary attacks.

Image Reconstruction From Highly Sparse and Limited Angular Diffraction Tomography Using Compressed Sensing Approach

“…Thus a few projections are sufficient to create an almost distortion free reconstruction. Hence it is of great importance in all applications dealing with highly limited projection data as in medical imaging [12][13][14][15][16][17], data channel sampling [18], radar imaging [19][20][21], spectrum sensing in cognitive radio systems [22] and many other applications. A steady focus is also directed towards improving the data acquisition and reconstruction frameworks for increasing the present capabilities of compressed sensing [23][24][25].…”