Wireless Opportunistic Network Based on UWB for Preserving Environment

In last years, research on developing sensing devices allows new applications for preserving the environment. A typical application foresees to collect data through sensors deployed in the desired area. We proposed to use Ultrawideband (UWB) technology to provide connectivity among sensors enabling the collecting site (the sink) to store environmental parameters. When necessary those parameters are transmitted to the remote monitoring site. The main problems of sensor network is from one side to have a large number of nodes to guarantee a high connectivity level and on the other side not to have a harmful interference on licensed primary users (PUs), with which UWBs share the same bandwidth. In this paper, we propose a deployment strategy for sensors in an open outdoor area. The methodology takes into account both connectivity and coexistence issues envisaged in the deployment phase. Results show that a certain connectivity level can be reached depending on the number of sensors in the area and on propagation conditions. Moreover, an analysis on coexistence between UWBs and PUs is performed depending on the number of PUs in the same area to be preserved and the bit rate required by the application.