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Misbehaving Relay Detection for Cooperative Communications without the Knowledge of Relay Misbehaviors

In the cooperative communications, the users relay each other's signal and thus form multiple transmission paths to the destination and therefore the system can achieve spatial diversity gain.
Most studies in the literature assumed that cooperative users acting as the relays are normally operated and trustworthy. However, this may not always be true in practice. When the relay misbehaviors are present in the cooperative communications, the communication performance may degrade dramatically and the users may be even better off without cooperation. Therefore, it is necessary for the destination to determine the misbehaving relays and to take appropriate actions
to ensure that cooperative advantages are preserved.
This thesis considers both models in which the cooperative communications are with direct path (WDP) and without direct path (WODP).
Utilizing the proposed Kolmogorov-Smirnov test mechanism, the destination identifies the misbehaving relays within the cooperative
communications and then excludes their transmitting messages when performing the diversity combining to infer the symbols of interest sent by the source.
In addition, this thesis provides the bit error rate (BER) analysis of the cooperative communications
employing the proposed misbehaving relay detectors. The simulation results demonstrate that the proposed methods have robust performance when the relay misbehaviors are present in the cooperative communications.

Identiferoai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0717112-152506
Date17 July 2012
CreatorsLi, Chieh-kun
ContributorsYu-Chao Tang, Tsang-Yi Wang, Wan-Jen Huang, Fan-Shuo Tseng
PublisherNSYSU
Source SetsNSYSU Electronic Thesis and Dissertation Archive
LanguageCholon
Detected LanguageEnglish
Typetext
Formatapplication/pdf
Sourcehttp://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0717112-152506
Rightsuser_define, Copyright information available at source archive

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