Title page for etd-0824111-143758


[Back to Results | New Search]

URN etd-0824111-143758
Author Zhao-Jie Wang
Author's Email Address m983070003@student.nsysu.edu.tw
Statistics This thesis had been viewed 5342 times. Download 1052 times.
Department Communications Engineering
Year 2010
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Noncoherent Detection of Misbehaving Relays in Space-Time Coded Cooperative Networks
Date of Defense 2011-07-29
Page Count 57
Keyword
  • Security
  • Misbehavior
  • Cooperative communication
  • Channel state information
  • OSTBC
  • Abstract Cooperative systems exploit spatial diversity to improve communication quality. But system performances could be severely degraded in the existance malicious relay nodes. In this thesis, we consider a two-relay decode-and-forward (DF) cooperative network. Relay nodes adopt Orthogonal Space Time Block Code (OSTBC) to achieve spatial diversity. Assume that relay nodes may misbehave with a certain probability. If a relay is malicious, it will garble transmission signals, resulting in severe damage to system performance. In the literature, detecting malicious relays requires perfect channel state information. However, misbehavior of the relay will first lead to inaccurate channel estimation. Therefore, we propose a novel detecting misbehavior scheme to deal with the dilemma. Since misbehavior of relays influences statistical properties of the estimated channel coefficients, destination can detect misbehaving by comparing the distribution of channel estimates. The most important of all is that we don’t need channel state information to enhance detecting performance. Through simulation results, we verify proposed scheme can detect misbehavior effectively without channel state information. Compared with signal-to-noise ratio, the number of received tracing symbols has more significant impact on detecting misbehavior of the relay.
    Advisory Committee
  • Tsang-Yi Wang - chair
  • Wenson Chang - co-chair
  • Chao-Kai Wen - co-chair
  • Wan-Jen Huang - advisor
  • Files
  • etd-0824111-143758.pdf
  • indicate access worldwide
    Date of Submission 2011-08-24

    [Back to Results | New Search]


    Browse | Search All Available ETDs

    If you have more questions or technical problems, please contact eThesys