Cognitive OFDMA: exploring a new FFT based detection technique for opportunistic usage
RWS'10 Proceedings of the 2010 IEEE conference on Radio and wireless symposium
The Teager-Kaiser energy operator in presence of multiple narrowband interference
IEEE Communications Letters
Throughput Analysis of the Intermittent DCF for Opportunistic Spectrum Access
Wireless Personal Communications: An International Journal
Orthogonal multiplexing in a subspace of frequency well- localized signals
IEEE Communications Letters
Pilot-assisted IFO estimation schemes for DVB-T systems
Proceedings of the 6th International Conference on Ubiquitous Information Management and Communication
Coding techniques to mitigate out-of-band radiation in high data rate OFDM-based cognitive radios
Computers and Electrical Engineering
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Recently, several approaches for increasing spectral efficiency have been proposed to overcome the scarcity of spectral resources and to ensure that the ever-growing demand for high-data rate mobile communications can be met in the future. In this article, we focus on OFDM-based overlay systems that share a frequency band with already existing systems without degrading their performance. This is achieved by temporarily using those parts of the common frequency band that are currently not used by the licensed system. In particular, we focus on design issues for the physical layer as well as the medium access control layer and propose appropriate solutions for enabling coexistence. As a result, our investigations show that OFDM-based overlay systems are a promising approach for enhancing spectral efficiency.