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http://dx.doi.org/10.7776/ASK.2009.28.8.774

A Node Grouping Method for Transmission Power Saving in Underwater Acoustic Sensor Network  

Hwang, Sung-Ho (경북대학교 전자전기컴퓨터학부)
Cho, Ho-Shin (경북대학교 전자전기컴퓨터학부)
Publication Information
The Journal of the Acoustical Society of Korea / v.28, no.8, 2009 , pp. 774-780 More about this Journal
Abstract
This paper proposes a transmitted power saving method for underwater acoustic sensors considering the acoustic wave propagation characteristic that propagation loss increases more rapidly in higher frequency band. In the proposed scheme, sensor nodes are divided into a few groups based on the distance between sink node and the sensor node, and each group uses its own frequency band. The node group with longer distance uses lower frequency and the node group with shorter distance uses higher frequency. By means of such a distance-dependent frequency allocation, all sensor nodes are able to maintain a certain target signal-to-noise ratio (SNR), but also save transmitted power. In addition, the optimum size of node group is obtained, and also a frequency allocation algorithm is proposed accordingly. Numerical results show that the proposed scheme saves transmitted power by more 10 dB comparing non-grouping methods.
Keywords
Underwater Acoustic Sensor Network; Signal-To-Noise Ratio; Transmitted Power; Node Grouping;
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