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Overlay/Underlay Waveform Design for Enhancing Spectrum Efficiency in Cognitive Radio

Overlay/Underlay Waveform Design for Enhancing Spectrum Efficiency in Cognitive Radio

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In this chapter, we presented a novel soft decision cognitive radio and dynamic spectrum access paradigm which exploits not only the unused spectrum holes, but also the underused spectrum bands to maximize performance and channel capacity for secondary cognitive users. We reviewed commonly used multi-carrier based enabling waveforms for cognitive radio. We then extended the SMSE framework to generate such overlay, underlay, and hybrid overlay/underlay waveforms to support the soft decision cognitive radio. Performance analysis and simulation results over AWGN and fading channels were then presented to confirm the performance gain of the novel system.

Inspec keywords: AWGN channels; fading channels; cognitive radio

Other keywords: fading channels; dynamic spectrum access paradigm; hybrid overlay-underlay waveforms; multicarrier based enabling waveforms; performance analysis; AWGN channels; soft decision cognitive radio; overlay-underlay waveform design; enhancing spectrum efficiency; channel capacity; SMSE framework; secondary cognitive users

Subjects: Radio links and equipment

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