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Adaptive Equalization at HSDPA Symbol Level

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3 Author(s)
A. Bastug ; VESTEK Electron., Istanbul, Turkey ; A. Ancora ; D. T. M. Slock

Although a simple solution, pilot-symbols-trained LMS algorithm is not capable of tracking fast varying channels in UMTS FDD downlink due to insufficient adaptation rate. Pilot-chips-trained LMS adaptation is on the other hand much more prone to noise. These two phenomena manifest themselves in the two components of the adaptation excess mean square (EMSE). A compromise can be found by considering HSDPA symbol-level Griffiths or decision-directed equalization. These two methods enable adapting 16 times more frequently than the pilot-symbols-aided adaptation. They are also attractive for implementation since a modular approach can be adopted by exploiting either one or more of the available HSDPA code domains depending on the instantaneous channel quality and the performance requirements.

Published in:

2009 IEEE International Conference on Communications Workshops

Date of Conference:

14-18 June 2009