"Advancing the future of wireless communications"

David Famolari, Narayan Mandayam and David Goodman

This talk formulated the problem of power control for wireless data systems in a microeconomic context. Distributed users of a CDMA system enter into a non-cooperative game by adjusting their transmitter powers to maximize their utility, defined as the amount of information they can transmit in the limited lifetime of their battery. The effect of forward error correction was shown to provide substantial increases in user utility at lower transmitter powers. However, the equilibrium of this game was shown to be Pareto inefficient, meaning that there exists another assignment of transmitter powers that will increase user utility. It was shown that if all the users in the cell would lower their transmitter powers, in concert, everyone could send more information in the lifetime of their batteries. Finally a pricing function was introduced to encourage users to lower their transmitter powers in a distributed fashion and thus increase the achievable utility for all users.

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