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Joint power control and intracell scheduling of DS-CDMA nonreal time data

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4 Author(s)
Berggren, F. ; Dept. of Radio Commun. Syst., R. Inst. of Technol., Stockholm, Sweden ; Seong-Lyun Kim ; Jantti, R. ; Zander, J.

The performance of DS-CDMA systems depends on the success in managing interference arising from both intercell and intracell transmissions. Interference management in terms of power control for real time data services like voice has been widely studied and shown to be a crucial component for the functionality of such systems. In this work we consider the problem of supporting downlink nonreal time data services, where in addition to power control, there is also the possibility of controlling the interference by means of transmission scheduling. One such decentralized schedule is to use time division so that users transmit in a one-by-one fashion within each cell. We show that this has merits in terms of saving energy and increasing system capacity. We combine this form of intracell scheduling with a suggested distributed power control algorithm for the intercell interference management. We address its rate of convergence and show that the algorithm converges to a power allocation that supports the nonreal time data users, using the minimum required power while meeting requirements on average data rate. Numerical results indicate a big potential of increased capacity and that a significant amount of energy can be saved with the proposed transmission scheme

Published in:

Selected Areas in Communications, IEEE Journal on  (Volume:19 ,  Issue: 10 )

Date of Publication:

Oct 2001

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