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Wake-up receivers can be used in wireless sensor networks to solve the problem of node synchronization in an energy efficient manner. Conceptually, the idea is to use a dedicated wake-up signal before the actual transmission over a main radio transceiver. Several ideas have been discussed in the literature on how to make such an architecture as energy efficient as possible. State of the art are multi-stage...
Duty cycling has been the main concept for saving energy in sensor networks for a long time. Yet, additional overhead for synchronization and the fact that overhearing and idle listening cannot completely be prevented, motivated further research. Wake-up receiver, i.e., additional ultra-low power radios that are not switched off and can receive a so called wake-up signal, aim to fill this gap. The...
In the smart cities of tomorrow huge amounts of data have to be processed. Cellular networks alone are unlikely to be able to cope with the amount of data and would introduce a critical dependence. Cars, on the other hand, are ubiquitous - even after massive disasters - and will be equipped with abundant communication technologies. This makes them a salient basis for connecting users and machines...
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