ece4305_L23

Ece4305_L23 - Spectrally Agile Waveforms ECE4305 Software-Defined Radio Systems and Analysis Professor Alexander M Wyglinski Department of

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Unformatted text preview: Spectrally Agile Waveforms ECE4305: Software-Defined Radio Systems and Analysis Professor Alexander M. Wyglinski Department of Electrical and Computer Engineering Worcester Polytechnic Institute Lecture 23 Professor Alexander M. Wyglinski ECE4305: Software-Defined Radio Systems and Analysis Spectrally Agile Waveforms Motivation Dynamic Spectrum Access Non-contiguous OFDM Inefficient Spectrum Utilization 0.088 0.35 0.65 0.95 1.25 1.55 1.85 2.15 2.45 2.686 x 10 9-130-120-110-100-90-80-70-60-50-40-30 Frequency (in GHz) Power (in dBm) SPECTRAL WHITESPACES Figure: Spectrum Snapshot from 88 MHz to 2686 MHz Measured on July 11, 2008 in Worcester, MA, USA ( N 42 ◦ 16 . 36602, W 71 ◦ 48 . 46548). S. Pagadarai, R. Rajbanshi, G. J. Minden, A. M. Wyglinski. “Agile Transmission Techniques.” in Cognitive Radio Communications and Networks: Principles and Practice (A. M. Wyglinski, M. Nekovee, Y. T. Hou (eds.)), Academic Press, 2009. Professor Alexander M. Wyglinski ECE4305: Software-Defined Radio Systems and Analysis Spectrally Agile Waveforms Motivation Dynamic Spectrum Access Non-contiguous OFDM Waveform Agility Needed I The utilization efficiency of “prime” wireless spectrum has been shown to be poor I In order to better utilize wireless spectrum, detection of white spaces in licensed bands and hardware reconfigurability are crucial I A variant of OFDM named non-contiguous OFDM (NC-OFDM) meets the above requirements and supports high data-rates while maintaining acceptable levels of error robustness Professor Alexander M. Wyglinski ECE4305: Software-Defined Radio Systems and Analysis Spectrally Agile Waveforms Motivation Dynamic Spectrum Access Non-contiguous OFDM Spectral “Divide-and-Conquer” Figure: An Illustration Showing Utilization of Non-contiguous Regions of Spectrum for Wireless Transmission....
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This note was uploaded on 01/13/2011 for the course ECE 4305 taught by Professor Wy during the Spring '10 term at WPI.

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Ece4305_L23 - Spectrally Agile Waveforms ECE4305 Software-Defined Radio Systems and Analysis Professor Alexander M Wyglinski Department of

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