kth.sePublikationer
Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Link Reliability in Cooperative Relaying Using Network Coding
KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS. (Radio Communication Systems)
2010 (Engelska)Licentiatavhandling, monografi (Övrigt vetenskapligt)
Abstract [en]

Demand for high data rates is increasing rapidly for future wireless systems.This trend is due to the increase in the number of mobile subscribers that need bandwidth hungry multimedia applications anywhere, anytime. Fourth generation cellular systems like IMT-advanced are being developed to meet these requirements. The unreliable nature of the wireless medium is one of the main hinderance in providing high data rates. Cooperative communication in cellular networks is emerging as a new paradigm to deal with the channel impairments. User cooperation via fixed relays in cellular systems form multiple access relay channels (MARCs) and provide an effective and cost efficient solution to achieve spatial diversity gains. Network resources can be utilized efficiently by using network coding at cooperating nodes.

A lot of research work has focused on highlighting the gains achieved by using network coding in MARCs. However, there are certain areas that are not fully explored yet. For instance, the kind of the detection scheme used at the base station receiver and its impact on the link performance has not been addressed. In most cases, the outage probability has been used as a performance measure of MARCs. However, it is well known that the outage probability gives information about the signal availability, but it does not give the complete picture about the reliability of the link and the achieved quality of service.

This thesis work looks at the link performance, in terms of symbol error probability, of multiple access relay channels that employ network coding at the relay node. Different types of detection schemes are considered and their performance is compared under different link conditions. Analytical expressions for the average symbol error probability of the cooperating users are derived. Focusing on the uplink of cellular systems, certain rules are devised on how to group users at relay node to ensure mutual benefit for the cooperating users. As a way of improving the link performance of multiple access relay channels and their robustness, the thesis considers constellation selection for the different branches. This method takes advantage of the redundancy between the transmitted symbols created by network coding and the augmented signal space obtained at the base station receiver. The obtained results show that, with a proper selection of the constellation sets, the link performance of MARCs can be improved. The thesis further looks at the interaction between the channel coding schemes of the cooperating users and network coding. It is shown that joint channel-network coding in MARCs can be seen as a product code. This new representation provides considerable flexibility in selecting efficient decoding algorithms at the base station receiver and gives the possibility to use more powerful network coding schemes for MARCs.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH , 2010. , s. 81
Serie
Trita-ICT-COS, ISSN 1653-6347 ; 1007
Nyckelord [en]
Cooperative Communications, Network Coding, Multiple Access Relay Channel
Nationell ämneskategori
Telekommunikation
Forskningsämne
SRA - Informations- och kommunikationsteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-25942OAI: oai:DiVA.org:kth-25942DiVA, id: diva2:361030
Presentation
2010-12-09, Electrum C1, SE-16440 Kista, Stockholm, Sweden, 14:00 (Engelska)
Opponent
Handledare
Projekt
Sino-Swedish Cooperative Program: IMT-Advanced and Beyond
Anmärkning
QC 20101118Tillgänglig från: 2010-11-18 Skapad: 2010-11-07 Senast uppdaterad: 2022-06-25Bibliografiskt granskad

Open Access i DiVA

fulltext(1124 kB)1004 nedladdningar
Filinformation
Filnamn FULLTEXT01.pdfFilstorlek 1124 kBChecksumma SHA-512
3781e33dc5675bf956ee049100c3ba78bccc3378cc370bea0f0570583ea616acd0a20c29d658a2f5fe867757094722b37b17ffd827dbe6f9e9eb647ebd32c735
Typ fulltextMimetyp application/pdf

Sök vidare i DiVA

Av författaren/redaktören
Ahsin, Tafzeel ur Rehman
Av organisationen
Kommunikationssystem, CoS
Telekommunikation

Sök vidare utanför DiVA

GoogleGoogle Scholar
Totalt: 1004 nedladdningar
Antalet nedladdningar är summan av nedladdningar för alla fulltexter. Det kan inkludera t.ex tidigare versioner som nu inte längre är tillgängliga.

urn-nbn

Altmetricpoäng

urn-nbn
Totalt: 877 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf