Modeling of DS-CDMA Transmit Power Control in a Fast Fading Channel with Antenna Diversity

Akihito KATOH
Fumiyuki ADACHI

IEICE TRANSACTIONS on Communications   Vol.E86-B    No.2    pp.769-776
Publication Date: 2003/02/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technology
DS-CDMA,  transmit power control,  fading,  mobile radio communications system,  

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In DS-CDMA mobile radio communications systems, transmit power control (TPC) is indispensable to regulate the variations in the received signal power produced by multipath fading. However, a practical TPC raises and lowers the mobile transmit power only at discrete time instants (the TPC rate is on the order of 1-2 kHz) and by a finite step size of the order of 1 dB. Therefore, TPC cannot completely compensate the received signal power variations and hence, the transmission performance degrades in a fast fading channel. The objective of this paper is to understand how TPC acts in a fast fading channel with antenna diversity reception and, based on this understanding, to model the TPC operation.