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dc.contributor.advisorShahbazPanahi, Shahram
dc.contributor.authorAskari, Mina
dc.date.accessioned2015-11-03T21:06:53Z
dc.date.accessioned2022-03-25T19:03:20Z
dc.date.available2015-11-03T21:06:53Z
dc.date.available2022-03-25T19:03:20Z
dc.date.issued2015-08-01
dc.identifier.urihttps://hdl.handle.net/10155/580
dc.description.abstractWe study the problem of sum-rate maximization, under a total transmit power budget, for an asynchronous single-carrier bidirectional (two-way) network. The network consists of two single-antenna transceivers which wish to exchange information with the help of multiple single-antenna amplify-and-forward (AF) relays. We assume that the network is asynchronous meaning that different transceiver-relay links cause significantly different propagation delays in the signal they convey. As a result, the end-to-end channel is not amenable to a frequency flat model, rather a multi-path channel model with multiple taps appears to be more appropriate. Such a multi-path model for the end-to-end channel raises the issue of inter-symbol-interference (ISI) at the two transceivers. In a block transmission/ reception scheme, ISI leads to inter-block interference (IBI), which could result in loss in the sum-rate of the network, if it is not considered in the design of the system. Considering a block transmission/reception scheme and assuming a total transmit power budget, we maximize the sum-rate of this ISI end-to-end channel over the relay complex weights and transceivers’ transmit powers. We rigorously prove that such a sum-rate maximization problem leads to a relay selection scheme, where only those relays which contribute to one tap of the end-to-end channel impulse response are turned on and the rest of the relays are switched off. Indeed, we prove that at the optimum, the end-to-end channel impulse response (CIR) has only one non-zero tap, rendering the end-to-end channel frequency flat. We present the optimal value of the vector of the weights of the active relays and the optimal values of the transceivers’ transmit powers in a semi-closed form.en
dc.description.sponsorshipUniversity of Ontario Institute of Technologyen
dc.language.isoenen
dc.subjectTwo-way relayingen
dc.subjectBi-directional relay networksen
dc.subjectSum-rate maximizationen
dc.subjectAsynchronous relay networksen
dc.titleSum-rate optimal network beamforming and power allocation for single-carrier asynchronous bidirectional relay networken
dc.typeThesisen
dc.degree.levelMaster of Applied Science (MASc)en
dc.degree.disciplineElectrical and Computer Engineeringen


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