Algoritmi raspodjele resursa u relejnim mrežama zasnovanima na frekvencijskom multipleksu ortogonalnih podnosilaca s višestrukim pristupom

doctoral thesis

• Title (english): Resource allocation algorithms in orthogonal frequency division multiple access based relay networks
• Author: Velimir Švedek; VIAF: 309879642
• Mentor: Željko Ilić (mentor)
• Committee member: Gordan Šišul (predsjednik povjerenstva)
• Committee member: Adrian Satja Kurdija (član povjerenstva)
• Committee member: Tomislav Matić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2024-05-03, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

Uvođenje novih informacijsko-komunikacijskih tehnologija i povezanih usluga za koje su potrebne velike prijenosne brzine nezamislivo je bez razvijenog širokopojasnog pristupa internetu i izgrađene mrežne infrastrukture. Kombinacija prijenosnih tehnologija zasnovanih na tehnikama frekvencijskog multipleksa ortogonalnih podnosilaca s višestrukim pristupom (OFDMA) s relejnim tehnikama omogućava priliku za razvoj bežičnih komunikacijskih mreža sljedeće generacije u kojima su zadovoljeni zahtjevi za velikim prijenosnim brzinama, povećanim dometom te poboljšanom spektralnom efikasnošću i mrežnom stabilnosti. Relejne mreže temeljene na tehnologiji OFDMA učestalo se koriste u širokopojasnim prijenosnim sustavima kao što su IEEE 802.11ax, IEEE 802.16 te mobilnim mrežama. Spomenute mreže iziskuju pažljiv dizajn algoritama procjene kanala, algoritama dodjele resursa, algoritama odabira releja te racionalno korištenje ukupne dostupne snage, pri čemu se kao cilj zajedničke optimizacije istih može postići što veća prijenosna brzina uz što manju uloženu snagu, a uzimajući u obzir i pravednosti raspodjele resursa. Cilj istraživanja bio je razvoj nove metode učinkovite procjene bežičnog kanala zasnovane na postupcima interpolacije i suradničkog filtriranja (CF) te temeljem navedenog u OFDMA relejnim mrežama optimizirati postupak odabira statičkih i mobilnih releja u svrhu postizanja definiranih QoS parametara kao i unaprijediti algoritam raspodjele i grupiranja potkanala u statičke i dinamičke odsječke s ciljem maksimiziranja prijenosnih brzina.

Abstract (english)

Introduction of new information and communication technologies and related services that require high transmission speeds is unthinkable without developed broadband Internet access and corresponding network infrastructure. The combination of Orthogonal Frequency-Division Multiple Access (OFDMA) techniques with relaying techniques provides an opportunity to develop wireless communication networks of the next generation in which the requirements for high transmission speeds, increased range and improved spectral efficiency and network stability are met. OFDMA relay based networks are often used in broadband transmission systems such as IEEE 802.11ax, IEEE 802.16 and mobile networks. The aforementioned networks require careful design of channel estimation algorithms, resource allocation algorithms, relay selection algorithms and rational use of the total available power, whereby the goal of their joint optimization is to achieve the highest transmission speed with the lowest power consumption, while also taking into account proportional fairness constraints. The goal of the research was to develop a new method of effective assessment of the wireless channel state based on interpolation methods and collaborative filtering (CF) procedures, and accordingly to optimize static and mobile relay selection techniques in order to achieve defined QoS parameters, with proposed novel chunk-based subcarrier allocation strategy by grouping subcarriers into two unequal (static and dynamic) chunks with the aim of maximizing transmission speeds in OFDMA relay based networks.

• Keywords: OFDMA; relejna postaja; tehnike relejnog prijenosa; algoritmi odabira releja; algoritmi dodjele resursa; procjena kanala; suradničko filtriranje; statički relej; mobilni relej
• Keywords (english): OFDMA; Relay Selection; Static Relay; Mobile Relay; Subcarrier Allocation; Chunk; Channel Estimation; Collaborative Filtering
• Language: croatian
• URN:NBN: urn:nbn:hr:168:645270
• Promotion: 2024
• Study programme: Title: Doctoral study programme "Electrical Engineering and Computing"; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti, po-dručje tehničkih znanosti (doktor/doktorica znanosti, po-dručje tehničkih znanosti)
• Type of resource: Text
• Extent: 116 str.
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-08-27 07:21:22