Hierarchical underwater acoustic sensor networks

Abstract

We consider a hierarchical Q1 Q2underwater acoustic sensor network architecture in which the sensors and the collector stations operate in distinct layers. The hierarchical architecture is motivated by the property of the acoustic underwater transmission medium that for each transmission distance, there exists an operating frequency for which the narrow-band signal-to-noise ratio is maximised. The sensors and the collector stations are consequently allocated different operating frequencies. We assume a uniform distribution of both sensors and collector stations over the finite area of the sensing field. The sensors are organised into clusters forming virtual transmit/receive arrays. The collector stations, on the other hand, are equipped with co-located transmit/receive arrays. We adopt a communication-theoretic approach and study the interdependence of the sustainable number of hops through the network, end-to-end frame error probability, power and bandwidth allocation. The analysis is performed under the assumption of Ricean fading and interference from other nodes within the same layer of the hierarchy. We present numerical examples that illustrate the network performance and demonstrate that there are preferred operating frequencies, which ensure network operation without any cross-interference between the collector network and the sensor network.

Energy-Efficient Communication Solutions Based on Wake-Up Receivers

“…However, that approach also allows clustering of nodes and designating only one node at a time as an energy-consuming higher tier node (cluster head) [13], [14]. The multi-tier architectures are typically designed for a specific application, e.g., hospital environment [15], traffic monitoring system [16], surveillance [17], environmental monitoring [18], smart home [19], or underwater acoustic sensor networks [20].…”