This paper studies the WCDMA mobile transmission power and its variations due to fast power control with theoretical calculations, simulations, laboratory measurements and field measurements. The effect of mobile speed, multipath profile and base station reception antenna diversity is studied. The results show that a mobile speed of 120 km/h requires less transmission power than low mobile speeds because of the time diversity provided by interleaving. With little multipath diversity and without antenna diversity the difference in terms of transmitted power is up to 2 dB. The measurements and simulations show that the multipath diversity gain of the ITU Vehicular A channel compared to ITU Pedestrian A channel is 3 dB without antenna diversity and 1 dB with antenna diversity at 3 km/h. At higher mobile speeds the multipath diversity gains are smaller. The base station antenna diversity gain is shown to be 3-4 dB in ITU Vehicular A channel and 4-6 dB in ITU Pedestrian A channel. The results show good agreement between simulations and measurements. The results also showed inaccuracies in the implementation of the SIR estimation in the experimental WCDMA base station receiver.
['Harri Holma', 'David Soldani', 'Kari Sipilä']
Simulated and measured WCDMA uplink performance