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• W838477673 abstract "The design and analysis of various distributed space time block codingschemes for asynchronous cooperative relay networks is consideredin this thesis. Rayleigh frequency flat fading channels are assumed tomodel the links in the networks, and interference suppression techniquestogether with an orthogonal frequency division multiplexing type transmissionapproach are employed to mitigate the synchronization errorsat the destination node induced by the different delays through therelay nodes.Closed-loop space time block coding is first considered in the contextof decode-and-forward (regenerative) networks. In particular, quasi orthogonaland extended orthogonal coding techniques are employed fortransmission from four relay nodes and parallel interference cancellationdetection is exploited to mitigate synchronization errors. Availabilityof a direct link between the source and destination nodes is studied,and a new Alamouti space time block coding technique with parallelinterference cancellation detection which does not require such a directlink connection and employs two relay nodes is proposed. Outercoding is then added to gain further improvement in end-to-end performanceand amplify-and-forward (non regenerative) type networkstogether with distributed space time coding are considered to reducerelay node complexity.Novel detection schemes are then proposed for decode-and-forwardnetworks with closed-loop extended orthogonal coding which reducethe computational complexity of the parallel interference cancellation.Both sub-optimum and near-optimum detectors are presented for relaynodes with single or dual antennas. End-to-end bit error rate simulationsconfirm the potential of the approaches and their ability tomitigate synchronization errors. A relay selection approach is also formulatedwhich maximizes spatial diversity gain and attains robustnessto timing errors.Finally, a new closed-loop distributed extended orthogonal spacetime block coding solution for amplify-and-forward type networks whichminimizes the number of feedback bits by using a cyclic rotation phaseis presented. This approach utilizes an orthogonal frequency divisionmultiplexing type transmission structure with a cyclic prefix to mitigatesynchronization errors. End-to-end bit error performance evaluationsverify the efficacy of the scheme and its success in overcoming synchronizationerrors." @default.
• W838477673 created "2016-06-24" @default.
• W838477673 creator A5006906171 @default.
• W838477673 date "2013-01-01" @default.
• W838477673 modified "2023-09-27" @default.
• W838477673 title "Distributed space time block coding in asynchronous cooperative relay networks" @default.
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• W838477673 hasPublicationYear "2013" @default.
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