Search results for "subcarrier pair"

showing 3 items of 3 documents

Energy Efficient Resource Allocation for OFDMA Two-Way Relay Networks with Channel Estimation Error

2015

In this work, we consider the practical issues of resource allocation problem in OFDMA two-way relay networks: the inaccuracy of channel-state information (CSI) available to the transmitters. Instead, only the estimated channel status is known by the transmitters. In this context, a joint optimization of subcarrier pairing and allocation, relay selection and transmit power allocation is formulated in the OFDMA two-way amplify-and-forward relay networks. Moreover, to ensure the Quality of Service (QoS) requirement, the energy consumption must be minimized without compromising the QoS. Therefore, by applying convex optimization techniques, energy efficient algorithms are developed with the ob…

EngineeringChannel allocation schemesta213business.industryQuality of serviceComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSradio resource allocationData_CODINGANDINFORMATIONTHEORYEnergy consumptionTransmitter power outputtwo way relaylaw.inventionrelay selectionimperfect challel state informationRelaylawConvex optimizationComputer Science::Networking and Internet ArchitectureResource allocationbusinessRelay channelsubcarrier pairingenergy efficiencyComputer Science::Information TheoryComputer network
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Energy-efficient resource allocation for OFDMA two-way relay networks with imperfect CSI

2015

Most of the existed works on the radio resource allocation (RRA) problem commonly assume the channel-state information (CSI) can be perfectly obtained by the transmission source. However, such assumption is not practical in the realistic wireless systems. In this work, we consider the practical implementation issues of resource allocation in orthogonal frequency division multiple access (OFDMA) two-way relay networks: the inaccuracy of channel-state information (CSI) available to the source. Instead, only the estimated channel status is known by the source. In this context, a joint optimization of subcarrier pairing and allocation, relay selection, and transmit power allocation is formulate…

Mathematical optimizationenergiatehokkuusComputer Networks and CommunicationsComputer scienceOrthogonal frequency-division multiple accessData_CODINGANDINFORMATIONTHEORYImperfect channel-state informationlaw.inventionOFDMARelaylawComputer Science::Information Theorybusiness.industryQuality of serviceComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSEnergy consumptionTransmitter power outputComputer Science ApplicationsTwo-way relaySubcarrier pairingSignal ProcessingConvex optimizationResource allocationbusinessRadio resource allocationCommunication channelComputer networkEfficient energy useEURASIP Journal on Wireless Communications and Networking
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Energy efficient resource allocation for secure OFDMA relay systems with eavesdropper

2016

In this paper, we address the energy efficient resource allocation problem for a secure orthogonal frequency division multiple access (OFDMA) relay system. In particular, we consider there is a eavesdropper near the base station (BS) which tries to overtake the information sent by BS. We formulate the joint optimization problem with the objective to optimize the energy efficiency of the considered system by considering subcarrier pairing, secret data rate and power allocation. In addition, the system can assign different priority to different users such that the security of information transmission can be guaranteed. The proposed iterative algorithm not only maximizes the system energy effi…

Optimization problemComputer scienceOrthogonal frequency-division multiplexingOrthogonal frequency-division multiple accessThroughput02 engineering and technologyrelaysecure communicationslaw.inventionOFDMABase station0203 mechanical engineeringRelaylawartificial noise0202 electrical engineering electronic engineering information engineeringResource managementenergy efficiencyta113business.industryQuality of servicesubcarrier pair020302 automobile design & engineering020206 networking & telecommunicationsbusinessEfficient energy useComputer network2016 IEEE International Conference on Communications (ICC)
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