FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2773043793> ?p ?o ?g. }

• W2773043793 abstract "Nowadays, mobile communications are characterized by a fast-increasing demand for internet-based services (voice, video data). Video services constitutes a large fraction of the internet traffic today. According to a report by Cisco, 75% of the world's mobile data traffic will be video-based by 2020. This ever-increasing demand in delivering internet-based services, has been the main driver for the development of the 4G digital cellular network, where packet- switched services are the primary design target. In particular, the overall system needs to ensure high peak data rates to the user and low delay in the delivery of the content, in order to support real time applications such as video streaming and gaming. This has motivated, in the last decade, a renewed and raising interest and research in wireless radio access technology. Wireless channel suffers from various physical phenomena like path-loss, shadowing, fading, interference, etc. In the most recent technologies, these effects are contrasted using Automatic Repeat re-Quest (ARQ) protocol, which consist on the retransmission of the same signal from the same node. ARQ protocol is usually combined with channel codes at the physical layer, which is known as Hybrid Automatic Repeat re-Quest (HARQ) protocol. Another improvement for communications over wireless channels is achieved when Relays are used as intermediate nodes for helping the communication between a Source and a Destination, which is known as cooperative communication. Both techniques, cooperation and HARQ, if individually applied, significantly improve the performance of the communication system. One open question is whether their combination would bring the sum of the singular improvements, or be only marginally beneficial. In the literature we can find many studies for the combination of these two techniques, but in our thesis we focus mainly on this interaction at the level of the physical layer (PHY) and the medium access control layer (MAC). We use example protocols on a network of three nodes (Source, Destination and Relay). For the theoretical analysis of these systems we focus on Finite State Markov Chains (FSMC). We discuss the case where Relay works in Decode-and-Forward (DCF) mode, which is very common in the literature, but our analysis focuses more strongly on the case where the Relay works in Demodulate-and-Forward (DMF) mode, because of its simplicity of implementation and its efficiency. This case is much more rarely addressed in the available literature, because of the higher complexity required by its analysis. Usually, the interaction between the two techniques has been studied using deterministic protocols, but in our analysis we will focus on both, deterministic and probabilistic protocols. So far, probabilistic protocols, where the retransmitting node is chosen with a given probability, have been mainly proposed for higher layers of communication systems, but, in contrast, this thesis studies probabilistic protocols on the physical layer and MAC layer, which give more insight on the analysis and performance optimization. The probabilistic protocols contains very few parameters (only 2) that can be optimized for best performance. Note that these parameters can be computed to mimic the behavior of a given deterministic protocol, and the result of the probabilistic protocol after optimization can only improve over this one. Moreover, the performance of our optimized probabilistic protocol is checked against results of the literature, and the comparison shows that our protocol performs better. In the end, there is also discussed the issue of relay selection. In a scenario of several candidate Relays, we propose a criterion for choosing the best Relay. The performance obtained by this criterion is compared to that obtained with the reference criteria in the literature." @default.
• W2773043793 created "2017-12-22" @default.
• W2773043793 creator A5082584930 @default.
• W2773043793 date "2017-12-19" @default.
• W2773043793 modified "2023-09-24" @default.
• W2773043793 title "On the interaction of cooperation techniques with channel coding and ARQ in wireless communications" @default.
• W2773043793 hasPublicationYear "2017" @default.
• W2773043793 type Work @default.
• W2773043793 sameAs 2773043793 @default.
• W2773043793 citedByCount "0" @default.
• W2773043793 crossrefType "dissertation" @default.
• W2773043793 hasAuthorship W2773043793A5082584930 @default.
• W2773043793 hasConcept C108037233 @default.
• W2773043793 hasConcept C118437007 @default.
• W2773043793 hasConcept C127162648 @default.
• W2773043793 hasConcept C138660444 @default.
• W2773043793 hasConcept C158379750 @default.
• W2773043793 hasConcept C171952454 @default.
• W2773043793 hasConcept C180611318 @default.
• W2773043793 hasConcept C31258907 @default.
• W2773043793 hasConcept C41008148 @default.
• W2773043793 hasConcept C49774154 @default.
• W2773043793 hasConcept C555944384 @default.
• W2773043793 hasConcept C76155785 @default.
• W2773043793 hasConcept C81978471 @default.
• W2773043793 hasConceptScore W2773043793C108037233 @default.
• W2773043793 hasConceptScore W2773043793C118437007 @default.
• W2773043793 hasConceptScore W2773043793C127162648 @default.
• W2773043793 hasConceptScore W2773043793C138660444 @default.
• W2773043793 hasConceptScore W2773043793C158379750 @default.
• W2773043793 hasConceptScore W2773043793C171952454 @default.
• W2773043793 hasConceptScore W2773043793C180611318 @default.
• W2773043793 hasConceptScore W2773043793C31258907 @default.
• W2773043793 hasConceptScore W2773043793C41008148 @default.
• W2773043793 hasConceptScore W2773043793C49774154 @default.
• W2773043793 hasConceptScore W2773043793C555944384 @default.
• W2773043793 hasConceptScore W2773043793C76155785 @default.
• W2773043793 hasConceptScore W2773043793C81978471 @default.
• W2773043793 hasLocation W27730437931 @default.
• W2773043793 hasOpenAccess W2773043793 @default.
• W2773043793 hasPrimaryLocation W27730437931 @default.
• W2773043793 hasRelatedWork W1542281211 @default.
• W2773043793 hasRelatedWork W1981929672 @default.
• W2773043793 hasRelatedWork W2010634176 @default.
• W2773043793 hasRelatedWork W2021793745 @default.
• W2773043793 hasRelatedWork W2026471569 @default.
• W2773043793 hasRelatedWork W2039855172 @default.
• W2773043793 hasRelatedWork W2110320896 @default.
• W2773043793 hasRelatedWork W2122260035 @default.
• W2773043793 hasRelatedWork W2242789155 @default.
• W2773043793 hasRelatedWork W2290966569 @default.
• W2773043793 hasRelatedWork W2293275123 @default.
• W2773043793 hasRelatedWork W2309837228 @default.
• W2773043793 hasRelatedWork W2911662657 @default.
• W2773043793 hasRelatedWork W2914600159 @default.
• W2773043793 hasRelatedWork W2949609996 @default.
• W2773043793 hasRelatedWork W2951635524 @default.
• W2773043793 hasRelatedWork W72713031 @default.
• W2773043793 hasRelatedWork W73777352 @default.
• W2773043793 hasRelatedWork W897498337 @default.
• W2773043793 hasRelatedWork W2035372560 @default.
• W2773043793 isParatext "false" @default.
• W2773043793 isRetracted "false" @default.
• W2773043793 magId "2773043793" @default.
• W2773043793 workType "dissertation" @default.