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Home | Seminars and Symposia | Past seminars/symposia: Tuesday, November 13, 2012

DTC Seminar Series

Random Subcarrier Allocation in OFDM-Based Cognitive Radio Networks


Erchin Serpedin
Electrical and Computer Engineering
Texas A&M University

Tuesday, November 13, 2012
3:30 p.m. reception
4:00 p.m. seminar

401/402 Walter Library

SerpedinThis talk investigates the performance of an orthogonal frequency-division multiplexing (OFDM)-based cognitive radio (CR) spectrum sharing communication system that assumes random allocation and absence of the primary user (PU)'s channel occupation information, i.e., no spectrum sensing is employed to acquire information about the availability of unused subcarriers or the PU's activity. In addition, no cooperation occurs between the transmitters of the PUs and secondary users (SUs). The average capacity of SU with subcarrier collisions is employed as performance measure to investigate the proposed random allocation scheme for both general and Rayleigh channel fading models. In the presence of multiple SUs, the multiuser diversity gain of SUs is also investigated. To avoid the subcarrier collisions at the SUs due to the random allocation scheme and to obtain the maximum sum rate for SUs based on the available subcarriers, an efficient centralized sequential algorithm based on the opportunistic scheduling and random allocation (utilization) method is proposed to ensure the orthogonality of assigned subcarriers.


Erchin Serpedin is currently a professor in the Department of Electrical and Computer Engineering at Texas A&M University, College Station. He is the author of 2 research monographs, 1 edited textbook, 8 book chapters, 85 journal papers and 120 conference papers, and serves currently as associate editor for IEEE Transactions on Information Theory, IEEE Transactions on Communications, Signal Processing (Elsevier), EURASIP Journal on Advances in Signal Processing, and EURASIP Journal on Bioinformatics and Systems Biology. His research interests include statistical signal processing, information theory, bioinformatics, and genomics.