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.
