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dc.contributor.advisorCui, Shuguangen_US
dc.creatorZhou, Jianweien_US
dc.date.accessioned2012-07-16T15:58:50Zen_US
dc.date.accessioned2012-07-16T20:27:07Z
dc.date.available2012-07-16T15:58:50Zen_US
dc.date.available2012-07-16T20:27:07Z
dc.date.created2012-05en_US
dc.date.issued2012-07-16en_US
dc.date.submittedMay 2012en_US
dc.identifier.urihttp://hdl.handle.net/1969.1/ETD-TAMU-2012-05-11141en_US
dc.description.abstractThis thesis studies a two-way relay network (TWRN), which consists of two single antenna source nodes and a multi-antenna relay node. The source nodes exchange information via the assistance of the relay node in the middle. The relay scheme in this TWRN is amplify-and-forward (AF) based analog network coding (ANC). A robust beamforming matrix optimization algorithm is presented here with the objective to minimize the transmit power at the relay node under given signal to interference and noise ratio (SINR) requirements of source nodes. This problem is first formulated as a non-convex optimization problem, and it is next relaxed to a semi-definite programming (SDP) problem by utilizing the S-procedure and rank-one relaxation. This robust beamforming optimization algorithm is further validated in a MATLAB-based orthogonal frequency-division multiplexing (OFDM) MIMO two-way relay simulation system. To better investigate the performance of this beamforming algorithm in practical systems, synchronization issues such as standard timing offset (STO) and carrier frequency offset (CFO) are considered in simulation. The transmission channel is modeled as a frequency selective fading channel, and the source nodes utilize training symbols to perform minimum mean-square error (MMSE) channel estimation. BER curves under perfect and imperfect synchronization are presented to show the performance of TWRN with ANC. It is shown that the outage probability of robust beamforming algorithm is tightly related to the SINR requirements at the source nodes, and the outage probability increases significantly when the SINR requirements are high.en_US
dc.format.mimetypeapplication/pdfen_US
dc.language.isoen_USen_US
dc.subjectAnalog network codingen_US
dc.subjectorthogonal frequency-division multiplexingen_US
dc.subjectrobust beamformingen_US
dc.subjectsemidefinite programmingen_US
dc.subjecttwo-way relay networken_US
dc.titleRobust Beamforming for OFDM Modulated Two-Way MIMO Relay Networken_US
dc.typeThesisen
thesis.degree.departmentElectrical and Computer Engineeringen_US
thesis.degree.disciplineElectrical Engineeringen_US
thesis.degree.grantorTexas A&M Universityen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelMastersen_US
dc.contributor.committeeMemberChamberland, Jean-Francoisen_US
dc.contributor.committeeMemberSprintson, Alexen_US
dc.contributor.committeeMemberLazarov, Raytchoen_US
dc.type.genrethesisen_US
dc.type.materialtexten_US


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