NDLI: Adaptive power control for underwater acoustic communications

Content Provider	IEEE Xplore Digital Library
Author	Qarabaqi, P. Stojanovic, M.
Copyright Year	2011
Description	Author affiliation: Department of Electrical and Computer Engineering, Northeastern University, Boston, Massachusetts 02115 (Qarabaqi, P.; Stojanovic, M.)
Abstract	Experimental measurements of shallow water acoustic channels show that the received signal power varies over time as the channel experiences fading. This fact motivates the use of adaptive power (or rate) control as a way to improve the system performance or save the transmit power. In a system with adaptive power control, the transmitter adjusts its power so that the received power remains at a pre-specified level whenever possible, or it shuts down when the channel conditions deteriorate beyond some point. Adaptive power control relies on feedback by which the receiver informs the transmitter of the present channel state. The transmitter can then predict the next state and adjust its power accordingly. This procedure will be effective if the channel variations are slow enough for the feedback mechanism to be implemented. In this paper, we investigate the feasibility of adaptive power control for underwater acoustic (UWA) communications using data recorded during the Surface Processes Acoustic Communications Experiment (SPACE) which was conducted off the coast of New England in a shallow water channel over a range of 1 km. The slow variations of the locally-averaged received power are shown to exhibit properties of a log-normally distributed autoregressive (AR) process with a coherence time on the order of several seconds. Adaptive prediction of the gain is applied to experimental data, demonstrating the feasibility of power control and indicating that substantial savings in average power are available over extended periods of time (about 9 dB over several hours). These values are also confirmed by a theoretical analysis.
Starting Page	1
Ending Page	7
File Size	954321
Page Count	7
File Format	PDF
ISBN	9781457700866
e-ISBN	9781457700880
DOI	10.1109/Oceans-Spain.2011.6003536
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-06
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Gain Power control Fading Receivers Adaptation models Transmitters Delay
Content Type	Text
Resource Type	Article

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