Adaptive power control in CDMA cellular communication systems

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Rintamäki, Matti 2012-02-17T07:18:04Z 2012-02-17T07:18:04Z 2005-11-18
dc.identifier.isbn 951-22-7898-7
dc.identifier.issn 1458-6401
dc.description.abstract Power control is an essential radio resource management method in CDMA cellular communication systems, where co-channel interference is the primary capacity-limiting factor. Power control aims to control the transmission power levels in such a way that acceptable quality of service for the users is guaranteed with lowest possible transmission powers. All users benefit from the minimized interference and the preserved signal qualities. In this thesis new closed loop power control algorithms for CDMA cellular communication systems are proposed. To cope with the random changes of the radio channel and interference, adaptive algorithms are considered that utilize ideas from self-tuning control systems. The inherent loop delay associated with closed loop power control can be included in the design process, and thus alleviated with the proposed methods. Another problem in closed-loop power control is that extensive control signaling consumes radio resources, and thus the control feedback bandwidth must be limited. A new approach to enhance the performance of closed-loop power control in limited-feedback-case is presented, and power control algorithms based on the new approach are proposed. The performances of the proposed algorithms are evaluated through both analysis and computer simulations, and compared with well-known algorithms from the literature. The results indicate that significant performance improvements are achievable with the proposed algorithms. en
dc.format.extent 169
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Helsinki University of Technology en
dc.publisher Teknillinen korkeakoulu fi
dc.relation.ispartofseries Report / Helsinki University of Technology, Signal Processing Laboratory en
dc.relation.ispartofseries 53 en
dc.subject.other Electrical engineering en
dc.title Adaptive power control in CDMA cellular communication systems en
dc.type G4 Monografiaväitöskirja fi
dc.description.version reviewed en
dc.contributor.department Department of Electrical and Communications Engineering en
dc.contributor.department Sähkö- ja tietoliikennetekniikan osasto fi
dc.subject.keyword CDMA en
dc.subject.keyword power control en
dc.subject.keyword adaptive control en
dc.subject.keyword self-tuning control en
dc.subject.keyword radio resource management en
dc.identifier.urn urn:nbn:fi:tkk-005831
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (monografia) fi
dc.type.ontasot Doctoral dissertation (monograph) en
dc.contributor.lab Signal Processing Laboratory en
dc.contributor.lab Signaalinkäsittelytekniikan laboratorio fi

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