Performance of relaying : infinite blocklength regime vs. finite blocklength regime

Hu, Yulin; Gross, James Richard; Schmeink, Anke

doi:34879

Performance of relaying : infinite blocklength regime vs. finite blocklength regime = Die Leistungsfähigkeit von Relaying : unendliche Blocklängen gegenüber endlichen Blocklängen

Hu, Yulin

2016

Verantwortlichkeitsangabevorgelegt von M.Sc. Yulin Hu Aus Anhui, China

ImpressumAachen 2016

Umfang1 Online-Ressource (XVII,183 S.) : Illustrationen

Dissertation, RWTH Aachen, 2015

Veröffentlicht auf dem Publikationsserver der RWTH Aachen University

Genehmigende Fakultät
Fak06

Hauptberichter/Gutachter
Schmeink, Anke (Thesis advisor) ; Gross, James Richard (Thesis advisor)

Tag der mündlichen Prüfung/Habilitation
2015-12-22

Online
URN: urn:nbn:de:hbz:82-rwth-2016-002140
URL: https://publications.rwth-aachen.de/record/565925/files/565925.pdf
URL: https://publications.rwth-aachen.de/record/565925/files/565925.pdf?subformat=pdfa

Einrichtungen

Lehr- und Forschungsgebiet für Informationstheorie und Systematischer Entwurf von Kommunikationssystemen (617120)

Inhaltliche Beschreibung (Schlagwörter)
Elektrotechnik, Elektronik (frei) ; finite blocklength regime (frei) ; relay (frei) ; C-ARQ (frei) ; energy efficiency (frei) ; effective capacity (frei)

Thematische Einordnung (Klassifikation)
DDC: 621.3

Kurzfassung
Bisherige Untersuchungen zur Leistungsfähigkeit von Relaying auf drahtlosenFading-Kanälen beruhen typischerweise auf vereinfachenden Annahmen wieperfekter Kenntnis des Kanalzustands und unendlicher Blocklänge bei derKanalcodierung, diese Annahmen sind aber in real existierenden Systemen nichtrealistisch.In dieser Arbeit werden umfassendere systematische Modelle zur Untersuchungdes Relaying entwickelt. Einerseits werden sowohl die physikalische Schicht alsauch die höheren Schichten des Übertragungskanals modelliert, und zwar unterBerücksichtigung von Kenngrößen wie beispielsweise Zuverlässigkeit, Kapazitätund Energieeffizienz. Andererseits werden diverse Szenarien mit verschiedenenAnnahmen bezüglich der Kenntnis des Kanalzustands und der Blocklänge (z.B.perfekte oder unvollständige Kenntnis des Kanalzustands, endliche oderunendliche Blocklänge) betrachtet.

Motivated by the increasing demand for higher throughput, broader coverage and higher-level quality of service (QoS), a major effort is being made to study the relaying technology in wireless networks. However, most existing research on investigatingthe relaying performance over wireless fading channels typically rely on simplifying assumptions, such as perfect channel state information (CSI) and infinite blocklength, which may be inaccurate in realistic wireless systems.In this dissertation, we contribute to developing more extensive and systematical investigation models of relaying. On one hand, both the physical-layer and the higher-layer performance models of relaying are developed while multiple performance metrics are taken into account, e.g., reliability, capacity and energy efficiency. On the other hand, various scenarios with different assumptions regarding CSI and blocklength (e.g., perfect or imperfect CSI and finite or infinite blocklengths) are considered. In general, the following fundamental questions are addressed based on our investigation models: Does relaying become more efficient or pay off less under these scenarios with more realistic assumptions (e.g., imperfect CSI or/and finite blocklengths)? What are performance differences if we do not consider or only consider one of these realistic assumptions? Is it essential to consider these realistic assumptions? What can we suggest for designing relaying systems especially for realistic applications?We achieve the above ultimate aim and find answers for these fundamental questions by two steps. In the first step, we investigate above performance metrics of relaying networks in the infinite blocklength regime (where blocklengths are infinite) and in thefinite blocklength regime (where blocklengths are finite), respectively. In particular, both the perfect CSI scenario and the imperfect CSI scenario are considered. In other words, by this step relaying performance models are studied under different assumptionsregarding CSI and blocklength, respectively. In the second step, we simulatively compare these relaying performance models under different scenarios/assumptions. By these two steps, we finally observe some surprising performance advantages of relayingin the finite blocklength regime (in comparison to in the infinite blocklength regime) and conclude a set of important guidelines for the design of efficient relaying systems.

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