Performance evaluation of mobile relays in CDMA system

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Jäntti, Riku; Prof. Hossain, Faisal Murad 2011-12-08T09:16:52Z 2011-12-08T09:16:52Z 2006
dc.description.abstract In this thesis we consider the uplink direction of DS-CDMA (Direct Sequence, Code Division Multiple Access) network with multihop transmission. For the purpose, we discussed simple conditions by which we can understand whether single hop or multihop is better. One promising direction that the current wireless network moves toward is multihopping that allows mobiles to relay packets of other mobiles to their destinations. A major reason for adopting such multihopping is in capacity and range enhancement, which may pay off its increased complexity. Here, we focus on the non-real-time (NRT) services in the uplink of a DS-CDMA cell. Mobiles are moving around the cell, trying to send NRT packets to the base station, possibly by multihopping. Our goal is to derive a per-hop based multihop scheduling algorithm that is easily applicable in a cellular network with high mobility. For the purpose, we utilize the similarity between the basketball game and our multihop uplink packet scheduling problem. By regarding players, the basket and the ball as mobiles, the base station and data packet, respectively, we can mimic passing (multihopping) patterns of the basketball players. A major difference between the two is that in the multihopping problem, there are many packets (balls) while in the basket ball game, there is only one ball to shoot into the basket. en
dc.format.extent 95
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Helsinki University of Technology en
dc.publisher Teknillinen korkeakoulu fi
dc.subject.other Computer science en
dc.subject.other Electrical engineering en
dc.title Performance evaluation of mobile relays in CDMA system en
dc.type G2 Pro gradu, diplomityö fi
dc.contributor.department Department of Electrical and Communications Engineering en
dc.contributor.department Sähkö- ja tietoliikennetekniikan osasto fi
dc.subject.keyword DS-CDMA en
dc.subject.keyword scheduling en
dc.subject.keyword NRT en
dc.subject.keyword multihop transmission en
dc.identifier.urn urn:nbn:fi:tkk-007465
dc.type.dcmitype text en
dc.programme.major Communications engineering en
dc.programme.major Tietoliikennetekniikka fi
dc.programme.mcode S-72
dc.type.ontasot Diplomityö fi
dc.type.ontasot Master's thesis en
dc.contributor.supervisor Häggman, Sven-Gustav; Prof.
dc.programme Tietoliikennetekniikan koulutusohjelma fi
dc.contributor.lab Laboratory of Communications Engineering en
dc.contributor.lab Tietoliikennetekniikan laboratorio fi
dc.location P1 fi

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