Image Processing Reference
In-Depth Information
E = Spectral efficiency
Bit rate/bandwidth
(Mbit/s * MHz)
Performance
2
0.2
0.02
P = Performance
nodes per
ms and per bandwidth
[nodes/(ms * MHz)]
R = Robustness
min./max. latency
(per unit)
0.1
1
10
0.5
0.05
0 .005
10
15.4 PHY
15.1 PHY-WISA:
11.g PHY
1
F = Frequency usage
bandwidth * (nodes * slot time) per
application cycle time (MHz)
Coexistence
FIGURE .
Characteristic figures for coexistence and performance according to Table ..
The effect of interference from other systems likely to operate in the same frequency band has been
analyzed, and WISA is designed to withstand such interference. For comparison of coexistence and
robustness, new characteristic figures have been proposed to quantify discussions.
A wireless power supply system has been designed and verified together with the wireless devices
in many practical installations.
The system has been implemented into products and its performance in real factory applications
has been verified and more than  million node hours have been accumulated. Products based on
it are commercially available and are used in a growing number of diverse applications in discrete
factory automation []; some of them are already running for more than  years.
References
. A.Willig,K.Matheus,andA.Wolisz,Wirelesstechnologyinindustrialnetworks, Proceedings of the
IEEE , (), -, June .
. D. Dzung, C. Apneseth, J.-E. Frey, and J. Endresen, Design and implementation of a real-time wireless
sensor/actuator communication system, ETFA'—th IEEE International Conference on Emerging
Technologies and Factory Automation , September -, , Catania, Italy.
. J.-E. Frey, G. Scheible, and A. Kreitz, Unplugged but connected, ABB Review , ,, -, -, .
. Bluetooth SIG, Specification of the Bluetooth System , Version ., February , .
 
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