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On the Power Efficiency of Sensory and Ad Hoc Wireless Networks

Dana, Amir F. and Hassibi, Babak (2006) On the Power Efficiency of Sensory and Ad Hoc Wireless Networks. IEEE Transactions on Information Theory, 52 (7). pp. 2890-2914. ISSN 0018-9448. doi:10.1109/TIT.2006.876245.

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We consider the power efficiency of a communications channel, i.e., the maximum bit rate that can be achieved per unit power (energy rate). For additive white Gaussian noise (AWGN) channels, it is well known that power efficiency is attained in the low signal-to-noise ratio (SNR) regime where capacity is proportional to the transmit power. In this paper, we first show that for a random sensory wireless network with n users (nodes) placed in a domain of fixed area, with probability converging to one as n grows, the power efficiency scales at least by a factor of sqrt n. In other words, each user in a wireless channel with n nodes can support the same communication rate as a single-user system, but by expending only 1/(sqrt n) times the energy. Then we look at a random ad hoc network with n relay nodes and r simultaneous transmitter/receiver pairs located in a domain of fixed area. We show that as long as r ≤ sqrt n, we can achieve a power efficiency that scales by a factor of sqrt n. We also give a description of how to achieve these gains.

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Additional Information:© Copyright 2006 IEEE. Reprinted with permission. Manuscript received July 28, 2003; revised May 15, 2005. [Posted online: 2006-07-05] This work was supported in part by the National Science Foundation under Grant CCR-0133818, by the Office of Naval Research under Grant N00014-02-1-0578, and by Caltech’s Lee Center for Advanced Networking. Communicated by G. Sasaki, Associate Editor for Communication Networks.
Subject Keywords:Capacity, sensor networks, wireless communication systems and networks
Issue or Number:7
Record Number:CaltechAUTHORS:DANieeetit06b
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4121
Deposited By: Archive Administrator
Deposited On:28 Jul 2006
Last Modified:08 Nov 2021 20:14

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