A Study of the Optimum Power Control Fixed Stepsize in the Presence of Power Control Loop Delay

Author

Patachaianand, Rachod ; Sandrasegaran, Kumbesan

Author_Institution

Univ. of Technol. Sydney, Sydney

fYear

2007

fDate

27-30 Aug. 2007

Firstpage

44

Lastpage

44

Abstract

Power control is one of the most important functions of wideband code division multiple access (WCDMA)-based system such as universal mobile telecommunication system (UMTS). A fixed stepsize power control algorithm is typically used in UMTS. The optimum fixed stepsize depends on the maximum Doppler frequency or user speed. This paper aims to study the optimum fixed stepsize within a range of user speeds. The simulation results show that a large fixed stepsize is optimal for a user moving fast when there is no additional loop-delay in the power control. In the presence of an additional loop-delay, a larger fixed stepsize is no longer suitable for a user moving at a high speed. In this particular scenario, power causes more fluctuations in received signal than no power control.

Keywords

3G mobile communication; broadband networks; code division multiple access; delays; power control; telecommunication control; UMTS; WCDMA; loop delay; maximum Doppler frequency; optimum fixed stepsize power control algorithm; universal mobile telecommunication system; wideband code division multiple access; 3G mobile communication; Base stations; Delay; Error correction; Feedback; Frequency; Multiaccess communication; Power control; Power engineering and energy; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Broadband and Ultra Wideband Communications, 2007. AusWireless 2007. The 2nd International Conference on

Conference_Location

Sydney, NSW

Print_ISBN

978-0-7695-2846-5

Electronic_ISBN

978-0-7695-2846-5

Type

conf

DOI

10.1109/AUSWIRELESS.2007.14

Filename

4299693