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TitleWideband interference in pilot symbol assisted OFDM systems
Publication TypeConference Paper
Year of Publication2010
AuthorsCoulson, A.J.
Conference Name2010 Australian Communications Theory Workshop, AusCTW 2010
Date Published2010
KeywordsAsymptotically optimal, Cognitive radio, Cognitive systems, Communication channels (information theory), computer simulation, Detectors, Gaussian distributed, Low complexity, Narrow band interference, OFDM systems, Orthogonal frequency division multiplexing, Orthogonal functions, Pilot symbol assisted, Pilot symbols, Pilot-symbol-assisted systems, Robust detection, Simulation result, Spectrum sharing, Technical presentations, Telecommunication systems, Wide-band interference
AbstractSpectrum sharing systems such as cognitive radios must both strive to avoid interference and be tolerant to interference. While pilot symbol assisted systems have previously been shown to have detection and synchronization adversely affected by narrowband interference, the impact of wideband interference has received little attention. This paper shows both analytically and by computer simulation that wideband interference prevents correct pilot symbol assisted detection and synchronization for SIRs of 0 dB and less. An asymptotically optimal detector is derived for pilot symbols in the presence of Gaussian distributed wideband interference. Simulation results are presented to demonstrate that robust detection can be achieved for SIRs as low as -60 dB using a low complexity implementation for a typical OFDM system. ©2010 IEEE.

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