Resilient wireless communications using randomly deployed transceivers

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There are many emerging wireless concepts and applications, where radio nodes of different sizes and capabilities are deployed under variable conditions. Also, the fast growth in the number of wireless systems deployed in a city or along a road will create an unpredictable interference environment. Since many of the new applications envisage using miniature radio devices with one or multiple antennas, it is important to develop new concepts that allow such devices to function with reasonable reliability under a wide range of conditions. The key is to build into the node enough flexibility in order to be able to adapt its communication parameters to the surrounding environment. The proposed research focuses on four aspects of ad-hoc wireless communications. The first aspect is to model and characterize the pathloss and scattering properties of randomly deployed radios in a realistic way. We plan to measure the signal strength and power delay profiles of the channels under different conditions. The second aspect is to characterize the relation between the transmission bandwidth, the propagation environment. Distance and density of deployment, data transfer capability and the life time of the node. The third aspect is to design, simulate and test new concepts that allow a small node to adapt to its environment in order to maintain reliable communications. The fourth aspect is to propose innovative methodologies to enhance the reliability of and health of the network. Measurement-based propagation modelling will provide an insight into ways to create an adaptive structure for the wireless node. In particular, we are aiming at examining the role of antennas and adaptive filters as ways to build robustness. Finally, we aim to examine our models against real-life applications such as the conditions encountered in monitoring large areas for safety, security or for monitoring the quality of air and water.