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dc.contributor.advisorLa, Richard Jen_US
dc.contributor.authorValluri, Abhijit Kiranen_US
dc.date.accessioned2016-06-22T05:54:06Z
dc.date.available2016-06-22T05:54:06Z
dc.date.issued2016en_US
dc.identifierdoi:10.13016/M2TF5G
dc.identifier.urihttp://hdl.handle.net/1903/18262
dc.description.abstractWe consider an LTE network where a secondary user acts as a relay, transmitting data to the primary user using a decode-and-forward mechanism, transparent to the base-station (eNodeB). Clearly, the relay can decode symbols more reliably if the employed precoder matrix indicators (PMIs) are known. However, for closed loop spatial multiplexing (CLSM) transmit mode, this information is not always embedded in the downlink signal, leading to a need for effective methods to determine the PMI. In this thesis, we consider 2x2 MIMO and 4x4 MIMO downlink channels corresponding to CLSM and formulate two techniques to estimate the PMI at the relay using a hypothesis testing framework. We evaluate their performance via simulations for various ITU channel models over a range of SNR and for different channel quality indicators (CQIs). We compare them to the case when the true PMI is known at the relay and show that the performance of the proposed schemes are within 2 dB at 10% block error rate (BLER) in almost all scenarios. Furthermore, the techniques add minimal computational overhead over existent receiver structure. Finally, we also identify scenarios when using the proposed precoder detection algorithms in conjunction with the cooperative decode-and-forward relaying mechanism benefits the PUE and improves the BLER performance for the PUE. Therefore, we conclude from this that the proposed algorithms as well as the cooperative relaying mechanism at the CMR can be gainfully employed in a variety of real-life scenarios in LTE networks.en_US
dc.language.isoenen_US
dc.titlePrecoder Detection for Cooperative Decode-and-Forward Relaying in OFDMA Systemsen_US
dc.typeThesisen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.contributor.departmentElectrical Engineeringen_US
dc.subject.pqcontrolledElectrical engineeringen_US
dc.subject.pquncontrolledEstimationen_US
dc.subject.pquncontrolledHypothesis Testen_US
dc.subject.pquncontrolledLTEen_US
dc.subject.pquncontrolledMobile Networksen_US
dc.subject.pquncontrolledOFDMAen_US
dc.subject.pquncontrolledPrecoderen_US


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