Search results for "Relay selection"

showing 3 items of 3 documents

Sparsity-aware multiple relay selection in large multi-hop decode-and-forward relay networks

2016

In this paper, we propose and investigate two novel techniques to perform multiple relay selection in large multi-hop decode-and-forward relay networks. The two proposed techniques exploit sparse signal recovery theory to select multiple relays using the orthogonal matching pursuit algorithm and outperform state-of-the-art techniques in terms of outage probability and computation complexity. To reduce the amount of collected channel state information (CSI), we propose a limited-feedback scheme where only a limited number of relays feedback their CSI. Furthermore, a detailed performance-complexity tradeoff investigation is conducted for the different studied techniques and verified by Monte …

wireless networksTheoretical computer scienceComputer scienceMultiple relay selectionsComplex networks050801 communication & media studiesfeedback02 engineering and technologyData_CODINGANDINFORMATIONTHEORYchannelslaw.inventionHop (networking)diversityCommunication channels (information theory)[SPI]Engineering Sciences [physics]0508 media and communicationsMSERelaylaw0202 electrical engineering electronic engineering information engineeringComputer Science::Networking and Internet Architecture[ SPI ] Engineering Sciences [physics]Computer Science::Information TheoryLarge DF relay networksLink Access Procedure for Frame Relaycooperative networks05 social sciencesComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSRelay control systems020206 networking & telecommunicationsChannel state informationChannel state informationRelay selectionOutage probabilityAlgorithmRelay channel
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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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Outage Analysis of Relay-Aided Non-Orthogonal Multiple Access with Partial Relay Selection

2018

Non-Orthogonal multiple access (NOMA) holds promise as a spectrally efficient multiple access scheme for 5G communication networks. This work investigates the performance of NOMA in a dual-hop amplify-and-forward (AF) relaying network, which is subject to Nakagami-$m$ fading. Specifically, we obtain a novel closed-form expression of the outage probability for the near and far users when the partial relay selection (PRS) scheme is used for selecting the best among $N$ intermediate relays. The users are considered to employ selection combining technique in order to combine the relayed and the direct transmission signals for an increased reliability of detection. Then, we evaluate the impact o…

Computer scienceReliability (computer networking)5G-tekniikkaData_CODINGANDINFORMATIONTHEORY02 engineering and technologylaw.inventionlangaton tiedonsiirto0203 mechanical engineeringRelaylawComputer Science::Networking and Internet Architecture0202 electrical engineering electronic engineering information engineeringElectronic engineeringFadingComputer Science::Information Theoryta213partial relay selectionComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS020206 networking & telecommunications020302 automobile design & engineeringselection combiningnon-orthogonal multiple access (NOMA)Telecommunications networkTransmission (telecommunications)Nakagami-fading5G
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