NDLI: Fractional power control for decentralized wireless networks

Content Provider	IEEE Xplore Digital Library
Author	Jindal, N. Weber, S. Andrews, J.G.
Copyright Year	2002
Abstract	We consider a new approach to power control in decentralized wireless networks, termed fractional power control (FPC). Transmission power is chosen as the current channel quality raised to an exponent -s, where s is a constant between 0 and 1. The choices s = 1 and s = 0 correspond to the familiar cases of channel inversion and constant power transmission, respectively. Choosing s isin (0,1) allows all intermediate policies between these two extremes to be evaluated, and we see that usually neither extreme is ideal. We derive closed-form approximations for the outage probability relative to a target SINR in a decentralized (ad hoc or unlicensed) network as well as for the resulting transmission capacity, which is the number of users/m² that can achieve this SINR on average. Using these approximations, which are quite accurate over typical system parameter values, we prove that using an exponent of s* = 1/2 minimizes the outage probability, meaning that the inverse square root of the channel strength is a sensible transmit power scaling for networks with a relatively low density of interferers. We also show numerically that this choice of s is robust to a wide range of variations in the network parameters. Intuitively, s* = 1/2 balances between helping disadvantaged users while making sure they do not flood the network with interference.
Starting Page	5482
Ending Page	5492
Page Count	11
File Size	412026
File Format	PDF
ISSN	15361276
Volume Number	7
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power control Wireless networks Signal to noise ratio Fading Iterative algorithms Flexible printed circuits Power transmission Capacity planning Robustness Interference Ad hoc networks, fading, transmission capacity (TC), power control.
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Electrical and Electronic Engineering Computer Science Applications

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