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      On the interplay between channel sensing and estimation in cognitive radio systems

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      Author
      Gursoy, M.C.
      Gezici, Sinan
      Date
      2011
      Source Title
      2011 IEEE Global Telecommunications Conference - GLOBECOM 2011
      Publisher
      IEEE
      Language
      English
      Type
      Conference Paper
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      Abstract
      Cognitive radio transmissions in the presence of channel uncertainty are considered. In practical scenarios, cognitive secondary users need to perform both channel sensing in order to identify whether the channel is being occupied by the primary users or not, and also channel estimation in order to learn the channel fading coefficients. Generally, errors occur in both channel sensing and estimation, and this leads to a coupling between the two. More specifically, imperfect sensing affects both the structure and the performance of channel estimation schemes. With this motivation, the interactions between channel sensing and estimation are studied in this paper. In particular, different channel estimation schemes including minimum mean-square error (MMSE), linear MMSE, and mismatched MMSE estimations are analyzed, and their dependence on sensing decisions and their performances are investigated. © 2011 IEEE.
      Keywords
      channel estimation
      channel sensing
      Cognitive radio
      minimum mean-square error estimation
      Channel fading
      Channel sensing
      Channel uncertainties
      Minimum mean-square error
      Minimum mean-square-error estimations
      MMSE estimation
      Channel estimation
      Cognitive radio
      Communication
      Mean square error
      Radio systems
      Radio transmission
      Estimation
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      http://hdl.handle.net/11693/28299
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/GLOCOM.2011.6133711
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      • Department of Electrical and Electronics Engineering 3524
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