Power Control Implementation in 3rd Generation CDMA Systems
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.
KeywordsCDMA Power control Soft handoff adaptive modulation rate control UMTS CDMA2000
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