Published in: VTC-2005-Fall. 2005 IEEE 62nd Vehicular Technology Conference, 2005.
Date of Conference: 28-28 September 2005
Date Added to IEEE Xplore: 16 January 2006
Print ISBN:0-7803-9152-7
Print ISSN: 1090-3038
Introduction
CDMA systems are capacity limited by the maximum tolerable level of interference received at the cellular base station (BS). This multiple access interference (MAI) or multiuser interference (MUI) imposes an upper bound on the maximum number of users that can be practically supported by the system, without losing reliable communication. In order to utilize the system resources and acquire spectrally efficient communications, several approaches have been taken, among which adaptive rate transmission and power control have been considered extensively during past few years. In [1] and [2], a class of suboptimal adaptive transmission techniques were presented, which used adaptive modulation in order to enhance the capacity of a fading channel. In [3], the joint optimisation of outer-loop power control and transmission rate adaptation is studied to maximise the spectral efficiency, subject to a long term transmit power constraint.
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