CDMA/HDR: a bandwidth efficient high speed wireless data service for nomadic users
IEEE Communications Magazine
SSDT-site selection diversity transmission power control for CDMA forward link
IEEE Journal on Selected Areas in Communications
Analysis of an up/down power control algorithm for the CDMA reverse link under fading
IEEE Journal on Selected Areas in Communications
Open-loop power control error in cellular CDMA overlay systems
IEEE Journal on Selected Areas in Communications
Segregating in- and other-cell interference with applications to decentralized admission control
IEEE Transactions on Communications
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Power control is one of the main features in 3rd generation cellular CDMA systems. Power control reduces the interference in the system and hence increases the capacity. In this paper, we describe the basic operation of power control implementation in 3G CDMA systems. The inner loop and the outer loop algorithms are explained where the power commands are sent at a high rate and uncoded resulting in high error rate in receiving them. The problem of errors in the power control commands becomes worse during soft handoff where the terminal communicates with more than one base station simultaneously. Few algorithms are introduced during soft handoff to increase the system capacity like power control rate reduction and the adjustment loop. Adjusting the transmission rate is discussed also as another scheme to achieve the required quality.