Title page for etd-0717112-152207


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URN etd-0717112-152207
Author Po-Yen Chou
Author's Email Address No Public.
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Department Communications Engineering
Year 2011
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Robust Channel Estimation for Cooperative Communication Systems in the Presence of Relay Misbehaviors
Date of Defense 2012-06-13
Page Count 35
Keyword
  • likelihood ratio
  • relay
  • misbehaving
  • mean square error
  • amplify-and-forward
  • Abstract In this thesis, we investigate the problem of channel estimation in the amplify-and-forward cooperative communication systems when the networks could be in the presence of selfish relays. The information received at the destination will be detected and then used to estimate the channel. In previous studies, the relays will deliver the information under the prerequisite for cooperation and the destination
    can receive the information sent from the source without any possible selfish relay. Therefore, the channel will be estimated under this over idealistic assumption. Unfortunately, the assumption does not make sense in real applications. Currently, we
    don’t have a mechanism to guarantee the relays will always be cooperative. The performance of channel estimation will be significantly degraded when the selfish relays present in the network. Therefore, this thesis considers an amplify-and-forward cooperative communication system with direct transmission and proposes a detection mechanism to overcome the misbehaving relay problem. The detection mechanism
    employed estimation is based on likelihood ratio test using both direct transmission and relayed information. The detection result will then be used to reconstruct the codeword used for estimating product channel gain of the source-to-relay and relay-
    to-destination links. The mathematical derivation for the considered problem is developed and numerical simulations for illustration is also carried out in the thesis. The numerical simulation results verify that the proposed method is indeed able to achieve robust channel estimation.
    Advisory Committee
  • Yu-Chao Tang - chair
  • Fan-Shuo Tseng - co-chair
  • Wan-Jen Huang - co-chair
  • Tsang-Yi Wang - advisor
  • Files
  • etd-0717112-152207.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2012-07-17

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