Centralized and Distributed Down-Link Power Control Methods for a DS/CDMA Cellular Mobile Radio System

Chung-Ju CHANG  Fang-Ching REN  

IEICE TRANSACTIONS on Communications   Vol.E80-B   No.2   pp.366-371
Publication Date: 1997/02/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Radio Communication
down-link,  DS/CDMA,  fading,  power control,  

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For down-link communication in a DS/CDMA cellular mobile radio system, the transmitted power of the base station must be effectively adjusted in real-time fashion to achieve good communication quality because the system exists multipath short-term fading and near-far problem. In this paper, we propose two down-link power control mechanisms: one is the centralized SIR-balancing method and the other is the distributed SIR-based method. We investigate how the outage probability is affected by system parameters and optimally design the parameters for these two down-link power control mechanisms. Also, the two down-link power control mechanisms are compared and discussed.