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Volume 31 Issue 8
Dec.  2010
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Qu Dai-ming, Wang Zhi-qiang. Spectral Sculpting of OFDM Signal for Opportunistic Spectrum Access[J]. Journal of Electronics & Information Technology, 2009, 31(8): 1965-1968. doi: 10.3724/SP.J.1146.2008.01149
Citation: Qu Dai-ming, Wang Zhi-qiang. Spectral Sculpting of OFDM Signal for Opportunistic Spectrum Access[J]. Journal of Electronics & Information Technology, 2009, 31(8): 1965-1968. doi: 10.3724/SP.J.1146.2008.01149

Spectral Sculpting of OFDM Signal for Opportunistic Spectrum Access

doi: 10.3724/SP.J.1146.2008.01149
  • Received Date: 2008-09-16
  • Rev Recd Date: 2009-01-22
  • Publish Date: 2009-08-19
  • In this paper, two novel methods called EAIC (Extended Active Interference Cancellation) and EAIC-H (EAIC-Hybrid) for spectral sculpting of OFDM signal are proposed. In EAIC and EAIC-H, cancellation signals are added to OFDM signal to cancel interference in target spectrum band caused by data tones, so that interference perceived by primary user can be limited. The cancellation signal (EAIC tones) has longer time duration than that of OFDM symbol, which enables a better notching capability than that of most existing methods. Simulation results show that the proposed methods can obtain very deep spectral notches of about 80 dB. Compared with EAIC, EAIC-H provides a better tradeoff between notching performance and SNR degradation for high order modulation.
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  • Sherman M, Mody A N, and Martinez R, et al.. IEEEStandards supporting cognitive radio and networks, dynamicspectrum access, and coexistence [J]. IEEE CommunicationsMagazine, 2008, 46(7): 72-79.[2]Seelig F W. A description of the August 2006 XGdemonstrations at Fort A. P. Hill [C]. New frontiers indynamic spectrum access networks, Dublin, Ireland, April17-20, 2007: 1-12.[3]Weiss T and Jondral F, et al.. Spectrum pooling: Aninnovative strategy for enhancement of spectrum efficiency[J]. IEEE Communications Magazine, 2004, 42(3): 8-14.[4]Yamaguchi H. Active interference cancellation technique forMB-OFDM cognitive radio [C]. 34th European MicrowaveConference, Amsterdam, Holland, Oct. 12-14, 2004:1105-1108.[5]Brandes S, Cosovic I, and Schnell M, et al.. Sidelobesuppression in OFDM systems by insertion of cancellationcarriers [C]. IEEE Vehicular Technology Conference, Dallas,Texas, USA, Sept. 25-28, 2005: 152-156.[6]Cosovic I, Brandes S, and Schnell M, et al.. Subcarrierweighting: A method for sidelobe suppression in OFDMsystems [J].IEEE Communications Letters.2006, 10(6):444-446[7]Cosovic I, Brandes S, and Schnell M, et al.. A technique forsidelobe suppression in OFDM systems [C]. IEEE GlobalTelecommunications Conference, St. Louis, MO, USA, Nov.29-Dec. 3, 2005: 204-208.[8]Brandes S, Cosovic I, and Schnell M, et al.. Reduction ofout-of-band radiation in OFDM based overlay systems [C].IEEE New Frontiers in Dynamic Spectrum Access Networks,Baltimoe, Maryland, USA, Nov. 8-11, 2005: 662-665.
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