A General Overlay/Underlay Analytic Expression Representing Cognitive Radio Waveform
Document Type
Article
Publication Date
10-8-2007
Identifier/URL
40279702 (Pure); 47749103368 (QABO)
Abstract
Several studies have revealed that spectrum congestion is primarily due to the inefficient use of spectrum versus unavailability. Cognitive radio (CR) and ultra wide band (UWB) technologies have been proposed as candidates to address this problem. Currently, a CR determines unused frequency bands and transmits overlay waveforms in these bands, while UWB transmits underlay waveforms that span the entire frequency band while coexisting with primary users. This suggests that most of the spectrum occupied by primary users is underused. This work proposes a general soft decision cognitive radio (SDCR) framework, based on a previous developed spectrally modulated, spectrally modulated (SMSE) framework, to combine benefits of overlay/underlay techniques while maximizing channel capacity. We also show that current CR and UWB implementations represent two extreme SDCR cases and that current overlay/underlay waveforms are two special cases of the general waveform platform.
Repository Citation
Chakravarthy, V. D.,
Wu, Z.,
Shaw, A.,
Temple, M. A.,
Kannan, R.,
& Garber, F.
(2007). A General Overlay/Underlay Analytic Expression Representing Cognitive Radio Waveform. 2007 International Waveform Diversity and Design Conference, 69-73.
https://corescholar.libraries.wright.edu/ee/258
DOI
10.1109/WDDC.2007.4339382
