Ing. Alexandru Moucha, Ph.D.

2014 - 2015

One of the problems of sensor networks is the fact that the wireless modules are small (in size) and have very limited resources (battery, processing power, transmission power, small antennas). In order to connect clusters of modules via long distances four methods can be applied: to increase antenna gains (which will increase the physical size of the modules), to increase the transmission power (which will drain the batteries faster), to install repeaters (sometimes this is not possible due to the remote locations such sensor arrays are used in) or to apply distributed phase-shift beamforming, which was the goal of our work in grant SGS11/158/OHK3/3T/13. However, the main problem is now to be able to interconnect multiple clusters and to be able to send information from cluster to cluster. Thus the problem we are now solving is to use the principle of distributed phase-shift beamforming to achieve data routing in a network composed of many clusters of modules.

2015

Ad-hoc and sensor networks are distributed wireless networks in which each device generally fulfils two functions: a task (or set of tasks) and relaying (helping other devices to communicate). All these devices are powered by batteries and thus the two functions are colliding in goals. The devices should relay but also conserve power. Too helpful for others results in quick battery depletion. Too selfish results in a disconnected network. There can be a threshold between helpfulness and selfishness and this is the goal of this project is to find this zone of fairness.