Performance of closed-loop power control for a multiple-channel mobile station in the cdma2000 system

摘要

We investigate the reverse link power control of the cdma2000 system where multiple traffic channel signals of different data rates are code-multiplexed and transmitted in a multipath Rayleigh fading environment. In particular, we evaluate the performance of a closed-loop power control scheme utilizing one power control command for all traffic channels. Simulation results show that the use of one common power control command may not be optimal for all code-multiplexed channel signals of different data rates. This is largely due to the different variations in the effective bit signal-to-interference-plus-noise ratios (SINRs) for a given fading rate in a multipath fading channel. With an observation of the performance improvement by more than 1 dB, we propose to use independent power control for each channel signal.