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Your search keyword '"Mogensen, Preben E."' showing total 84 results
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84 results on '"Mogensen, Preben E."'

82. Emulation Based Performance Investigation of FTP File Downloads over UMTS Dedicated Channels.

Author

Lorenz, Pascal, Dini, Petre, Teyeb, Oumer M., Boussif, Malek, Sørensen, Troels B., Wigard, Jeroen, and Mogensen, Preben E.

Abstract

The Radio Link Control (RLC) protocol of Universal Mobile Telecommunication System (UMTS) provides link layer reliability that could mitigate the effects of the hostile radio propagation channel on packet data transmission. In this paper, the impact of some of the RLC reliability mechanisms on the performance of File Transport Protocol (FTP) is investigated. The investigations are carried out using a real time emulation platform, which makes the results from this study more realistic than simulation or simplified analytical studies as the overall End-2-End performance is analyzed involving real world protocol implementations. [ABSTRACT FROM AUTHOR]

Published
2005

84. Performance of Spatial Division Multiplexing MIMO with Frequency Domain Packet Scheduling: From Theory to Practice.

Author

Na Wei, Pokhariyal, Akhilesh, Sørensen, Troels B., Kolding, Troels E., and Mogensen, Preben E.

Subjects
MULTIPLEXING, MIMO systems, DATA packeting, DATA transmission systems, CELL phone systems, METROPOLITAN area networks (Computer networks)
Abstract

This paper addresses the performance of Spatial Division Multiplexing (SDM) Multiple-input Multiple-output (MIMO) techniques together with Frequency Domain Packet Scheduling (FDPS) in both theory and practice. We start with theoretical analysis under some ideal assumptions to derive the performance bounds of SDM-FDPS. To facilitate the analysis, unified SINR concept is utilized to make a fair comparison MIMO schemes with different number of spatial streams. The effect of packet scheduling is included in the post-scheduling SINR distribution using an analytical model. Based on that, performance bounds are obtained with a more realistic SINR to throughput mapping metric. The system-level performance SDM-FDPS has been evaluated under practical constraints using detailed simulations based on the UTRAN Long Term Evolution (LTE) downlink cellular system framework. The purpose is to investigate the impact of realistic factors on performance. Results confirm that the combination of SDM and FDPS can increase the spectral efficiency significantly, particularly in micro-cell scenario, and up to 30%-60% gain is observed over 1x2 with FDPS depending on the traffic models considered. Finally, the more practical simulation results are compared against the theoretical performance bounds. A performance loss is seen in the simulations due to realistic coding/modulation, impact of frequency selectivity, signalling constraints, imperfect channel quality indicator (CQI), etc. [ABSTRACT FROM AUTHOR]

Published
2008
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