Title page for ETD etd-12202010-142616


Type of Document Dissertation
Author Recio, Adolfo Leon
Author's Email Address recio@vt.edu
URN etd-12202010-142616
Title Spectrum-Aware Orthogonal Frequency Division Multiplexing
Degree PhD
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Athanas, Peter M. Committee Chair
Buehrer, Richard Michael Committee Member
de Sturler, Eric Committee Member
Martin, Thomas L. Committee Member
Patterson, Cameron D. Committee Member
Keywords
  • Overlay Systems
  • Cognitive Radio
  • Spectrum Awareness
  • Filter Bank Multi-carrier
  • OFDM
  • Dynamic Spectrum Access
  • Configurable Computing
Date of Defense 2010-12-15
Availability unrestricted
Abstract
Reconfigurable computing architectures are well suited for the dynamic data flow processing requirements of software-defined radio. The software radio concept has quickly evolved to include spectrum sensing, awareness, and cognitive algorithms for machine learning resulting in the cognitive radio model.

This work explores the application of reconfigurable hardware to the physical layer of cognitive radios using non-contiguous multi-carrier radio techniques. The practical tasks of spectrum sensing, frame detection, synchronization, channel estimation, and mutual interference mitigation are challenges in the communications and the computing fields that are addressed to optimally utilize the capacity of opportunistically allocated spectrum bands.

FPGA implementations of parameterizable OFDM and filter bank multi-carrier (FBMC) radio prototypes with spectrum awareness and non-contiguous sub-carrier allocation were completed and tested over-the-air. Sub-carrier sparseness assumptions were validated under practical implementation and performance considerations. A novel algorithm for frame detection and synchronization with mutual interference rejection applicable to the FBMC case was proposed and tested.

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