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ChinaCom2009-Wireless Communications and Networking Symposium

Research Article

Sidelobe Suppression Using Extended Active Interference Cancellation with Self-interference Constraint for Cognitive OFDM System

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BibTeX Plain Text
  • @INPROCEEDINGS{10.1109/CHINACOM.2009.5339921,
        author={Daiming Qu and Zhiqiang Wang and Tao Jiang1 and Mahmoud Daneshmand},
        title={Sidelobe Suppression Using Extended Active Interference Cancellation with Self-interference Constraint for Cognitive OFDM System},
        proceedings={ChinaCom2009-Wireless Communications and Networking Symposium},
        publisher={IEEE},
        proceedings_a={CHINACOM2009-WCN},
        year={2009},
        month={11},
        keywords={OFDM; out-of-band radiation; sidelobe suppression; oppotunistic spectrum access; cognitive radio},
        doi={10.1109/CHINACOM.2009.5339921}
    }
    
  • Daiming Qu
    Zhiqiang Wang
    Tao Jiang1
    Mahmoud Daneshmand
    Year: 2009
    Sidelobe Suppression Using Extended Active Interference Cancellation with Self-interference Constraint for Cognitive OFDM System
    CHINACOM2009-WCN
    IEEE
    DOI: 10.1109/CHINACOM.2009.5339921
Daiming Qu1, Zhiqiang Wang1, Tao Jiang11, Mahmoud Daneshmand2
  • 1: 1Dept. of Electronics and Info. Engineering, Huazhong Univ. of Science and Tech., Wuhan, China
  • 2: 2AT&T Labs Research, Florham Park, New Jersey, USA

Abstract

To improve the spectrum utilization, more and more attention was paid to OFDM based opportunistic spectrum access (OSA) systems in recent years. In this paper, to enable coexistence between a secondary user and a primary user, a novel method called EAIC was proposed for spectral sculpting of OFDM signal effectively. In EAIC, however, the cancellation signals cause self-interferences to OFDM data tones so that the symbol-error-rate (SER) performance was degraded especially in high order modulation such as 64 QAM. In this paper, a new method called EAIC with self-interference constraint (EAIC-IC) is proposed, in which we analyze the interferences caused by cancellation signals, and then formulate an optimization problem to minimize both the total sidelobe power and the self-interferences. Simulation results show that the EAIC-IC method can provide a perfect tradeoff between spectrum notch depth and SER performance via adjusting the value of the constraint parameter.

Keywords
OFDM; out-of-band radiation; sidelobe suppression; oppotunistic spectrum access; cognitive radio
Published
2009-11-20
Publisher
IEEE
Modified
2010-05-16
http://dx.doi.org/10.1109/CHINACOM.2009.5339921
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