An intelligent physical layer for cognitive radio networks
Proceedings of the 4th Annual International Conference on Wireless Internet
Sora: high performance software radio using general purpose multi-core processors
NSDI'09 Proceedings of the 6th USENIX symposium on Networked systems design and implementation
Preamble design for non-contiguous spectrum usage in cognitive radio networks
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Supporting demanding wireless applications with frequency-agile radios
NSDI'10 Proceedings of the 7th USENIX conference on Networked systems design and implementation
An architecture for software defined cognitive radio
Proceedings of the 6th ACM/IEEE Symposium on Architectures for Networking and Communications Systems
Building efficient spectrum-agile devices for dummies
Proceedings of the 18th annual international conference on Mobile computing and networking
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Spectrum Pooling has lead the cognitive radio research community to a new frontier where it is imperative to examine the architectures of wireless network protocols as well as the underlying hardware. Challenges at the physical layer (PHY) have increased the complexity of the algorithms used in processing a signal with multifarious properties. Synchronization of Non-Contiguous Orthogonal Frequency Division Multiplexing (NC-OFDM) is one such example where a clean slate algorithm and implementation is of utmost need. In this paper, we present a novel algorithm to perform NC-OFDM synchronization in the presence of an incumbent and also provide an outline for a FPGA based implementation of the proposed synchronizer. Extensive simulations under varying signal-to-noise ratio (SNR) and bandwidth reveal significant improvement over existing algorithms employed for NC-OFDM synchronization in cognitive radios.