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      Error rate analysis of cognitive radio transmissions with imperfect channel sensing

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      Author
      Ozcan G.
      Gursoy, M. C.
      Gezici, Sinan
      Date
      2013
      Source Title
      2013 IEEE 78th Vehicular Technology Conference (VTC Fall)
      Print ISSN
      1090-3038
      Publisher
      IEEE
      Language
      English
      Type
      Conference Paper
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      Abstract
      In this paper, error rate performance of cognitive radio transmissions is studied in the presence of imperfect channel sensing decisions. It is assumed that cognitive users first perform channel sensing, albeit with possible errors. Then, depending on the sensing decisions, they select the transmission energy level and employ MI × MQ rectangular quadrature amplitude modulation (QAM) for data transmission over a fading channel. In this setting, the optimal decision rule is formulated under the assumptions that the receiver is equipped with the sensing decision and perfect knowledge of the channel fading. It is shown that the thresholds for optimal detection at the receiver are the midpoints between the signals under any sensing decision. Subsequently, minimum average error probability expressions for M-ary pulse amplitude modulation (M-PAM) and MI×MQ rectangular QAM transmissions attained with the optimal detector are derived. The effects of imperfect channel sensing decisions on the average symbol error probability are analyzed. Copyright © 2013 by the Institute of Electrical and Electronic Engineers, Inc.
      Keywords
      Channel sensing
      Cognitive radio
      Fading channel
      Gaussian mixture noise
      PAM
      QAM
      Symbol error probability
      Average error probability
      Channel sensing
      Error rate performance
      Gaussian mixture noise
      Imperfect channel sensing
      M-ary pulse amplitude modulations (M-PAM)
      Rectangular quadrature amplitude modulation
      Symbol error probabilities (SEP)
      Cognitive radio
      Optimization
      Pulse amplitude modulation
      Quadrature amplitude modulation
      Radio transmission
      Fading channels
      Permalink
      http://hdl.handle.net/11693/27933
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/VTCFall.2013.6692196
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      • Department of Electrical and Electronics Engineering 3524
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