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A Comparative Study of Predictive Transmit Power Control Schemes for S-UMTS

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Abstract

Transmit power control is indispensable in Direct Sequence Code Division Multiple Access (DS/CDMA) based systems such as the Satellite Universal Mobile Telecommunication System (S-UMTS). Since S-UMTS aims at achieving close integration with the terrestrial component (T-UMTS) in its complementary role, it is going to implement closed-loop transmit power control (TPC) at a slow rate of once every frame. In addition, predictive schemes can be used to mitigate the effects of delay. In this regard, recursive-least-squares (RLS) and least-mean-square (LMS) algorithms are normally employed. The RLS algorithm has a higher convergence rate than the LMS algorithm: an attractive attribute when the fading process abruptly changes. The LMS algorithm, on the other hand, has better tracking property than the RLS algorithm: an attractive attribute when the changes in the fading process are persistently slow. However, the mobile satellite system channel exhibits both attributes: abrupt changes and slow drifts. In this paper, therefore, we compare the performance of predictive TPC based on the RLS and the LMS algorithms for S-UMTS with the conventional TPC as a reference. We demonstrate that the predictive TPC schemes perform better than the conventional TPC scheme. However, the performance gain achieved depends on the predictive algorithm used, the environment in which the user equipment is operating, and loop delays. We show that, in general, the LMS based predictive TPC offers better performance than the RLS based predictive TPC scheme in S-UMTS environment.

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Authors and Affiliations

  1. University of Malawi, The Polytechnic, P/Bag 303, Chichiri, Blantyre 3, Malawi

    Harry S. H. Gombachika

  2. Centre for Communication Systems Research (CCSR), University of Surrey, Guildford, Surrey, GU2 7XH, UK

    Rahim Tafazolli & Barry G. Evans

Authors
  1. Harry S. H. Gombachika
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  2. Rahim Tafazolli
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  3. Barry G. Evans
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Correspondence to Harry S. H. Gombachika.

Additional information

Harry S. H. Gombachika is currently a Senior Lecturer in Telecommunications at the University of Malawi. He received a B.Sc. in Electrical Engineering from the University of Malawi in 1990, an M.Sc. in Electrical Engineering from the State University of New York at Buffalo, USA in 1996, and a Ph.D. in Electrical Engineering from the University of Surrey, UK in 2003. He joined the University of Malawi in 1990 as a staff associate and has since worked as an assistant Lecturer and Lecturer. From 1998 to 2000 he worked as the head of the Electrical Engineering department. His research interests include telecommunication networks for rural areas and capacity enhancing techniques for mobile communication systems.

Rahim Tafazolli is the Head of Mobile Communications Research Group in CCSR, School of Electronics and Physical Sciences. His research activities are on optimization techniques for mobile multimedia networks, mainly on advance Resource management, Mobility management and Media Access Control. He has published more than 300 research papers in refereed journals, international conferences and as invited speaker. He currently has more than 15 patents in the field of mobile communications. He is advisor and consultant to a number of mobile companies and external examiner to Birmingham University (UK), and Nanyang University (Singapore). He is the founder and the past Chairman of International Conference on “3G Mobile Technologies”. He is also member of IEE Committee on the UK Regulations on “Information Technology & Telecommunications”, a member of the EU Wireless Strategy Initiative (WSI) Think-Tank group, Chairman of “New Technologies” group of Wireless World Research Forum (WWRF), and academic co-ordinator of the UK Mobile VCE (Virtual Centre of Excellence).

Barry Evans was educated at the University of Leeds, obtaining BSc (1st Class Hons.) and Ph.D. degrees in 1965/8 respectively. He then joined the British Telecom sponsored team at the University of Essex (Lecturer-Reader 1968-83) where he was responsible for Telecommunications Systems post-graduate activities and radio and satellite research. In 1983 he was appointed to the Alex Harley Reeves Chair of Information Systems Engineering at the University of Surrey. In 1990 the research was brigaded into a new research centre at Surrey (the model for future developments at Surrey)—the Centre for Satellite Engineering Research. In 1996, he became Director of the new Centre for Communication Systems Research (CCSR) within the School of Electronics & Physical Sciences. From 1998 Barry was Dean of Engineering at Surrey overseeing the restructuring of engineering on the Surrey campus. From August 2001 he was appointed Pro-Vice-Chancellor for Research and Enterprise. Barry Evans was instrumental in setting-up, within Foresight, the idea of Virtual Centres of Excellence. He has served on the MOD DSAC Committee for the ten years, which involves advising MOD on its research programmes. He was also the U.K. delegate on the COST 252, 253 and 272 Committees as well as a delegate to several ETSI Committees. He is editor of the International Journal of Satellite Communications and the author of three books on telecommunications and satellites as well as over 400 papers in learned journals. He was elected to a Fellowship of the Royal Academy of Engineering in 1991.

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Gombachika, H.S.H., Tafazolli, R. & Evans, B.G. A Comparative Study of Predictive Transmit Power Control Schemes for S-UMTS. Wireless Netw 11, 215–222 (2005). https://doi.org/10.1007/s11276-005-6605-8

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