In Cyber-Physical Systems (CPSs) computational algorithms and physical components are integrated in a seamless manner. The physical components are typically connected by wireless data communications devices with each other to share data or to build up a network.
This talk will focus on the short-range wireless communications technologies used to establish the data transfer among the physical components of CPSs. These devices have to operate under the rules of unlicensed radio communications. The most frequently proposed technology today is the Ultra-WideBand Impulse Radio (UWB-IR) approach which can re-use the already occupied frequency bands.
UWB-IR employs RF pulses with very short duration to carry the information. It causes a very low-level of interference in the other, already deployed radio links and networks, offers low and medium data-rate, can re-use the already occupied radio frequency bands and assures low probability of message collisions. To limit the interference caused, the maximum power radiated by a UWB device is restricted by the Federal Communications Commission (FCC) in the US. Introducing a new mathematical model and starting from the FCC Regulations analytical expressions for the calculation of FCC power limits will be derived in the talk. It will be shown that the low- and high-rate UWB-IR systems are peak and average power limited, respectively. The relationship between the mathematical model and the parameters of a UWB carrier pulse used in a built UWB radio will be established. The performances of RF carrier pulses known from the literature will be evaluated and compared. It will be shown that the UWB IR technology can offer only a limited radio coverage because of the FCC restrictions.