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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
      2014
      Source Title
      IEEE Transactions on Wireless Communications
      Print ISSN
      1536-1276
      Publisher
      Institute of Electrical and Electronics Engineers Inc.
      Volume
      13
      Issue
      3
      Pages
      1642 - 1655
      Language
      English
      Type
      Article
      Item Usage Stats
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      179
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      Abstract
      This paper studies the symbol error rate performance of cognitive radio transmissions in the presence of imperfect sensing decisions. Two different transmission schemes, namely sensing-based spectrum sharing (SSS) and opportunistic spectrum access (OSA), are considered. In both schemes, secondary users first perform channel sensing, albeit with possible errors. In SSS, depending on the sensing decisions, they adapt the transmission power level and coexist with primary users in the channel. On the other hand, in OSA, secondary users are allowed to transmit only when the primary user activity is not detected. Initially, for both transmission schemes, general formulations for the optimal decision rule and error probabilities are provided for arbitrary modulation schemes under the assumptions that the receiver is equipped with the sensing decision and perfect knowledge of the channel fading, and the primary user's received faded signals at the secondary receiver has a Gaussian mixture distribution. Subsequently, the general approach is specialized to rectangular quadrature amplitude modulation (QAM). More specifically, the optimal decision rule is characterized for rectangular QAM, and closed-form expressions for the average symbol error probability attained with the optimal detector are derived under both transmit power and interference constraints. The effects of imperfect channel sensing decisions, interference from the primary user and its Gaussian mixture model, and the transmit power and interference constraints on the error rate performance of cognitive transmissions are analyzed.
      Keywords
      Channel sensing
      Cognitive radio
      Fading channel
      Gaussian mixture noise
      Interference power constraint
      PAM
      Probability of detection
      Probability of false alarm
      QAM
      Symbol error probability
      Cognitive radio
      Errors
      Optimization
      Probability
      Pulse amplitude modulation
      Quadrature amplitude modulation
      Radio transmission
      Channel sensing
      Gaussian mixture noise
      Permalink
      http://hdl.handle.net/11693/26542
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/TWC.2014.020414.131182
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