Image Processing Reference
In-Depth Information
IEEE . is a WLAN technology that enables higher data rates but is not too power-consumption
friendly. Additionally, in a relatively dense network scenario the theoretical maximum aggregate
throughput of three times ./. Mbps is very likely to be seriously impaired. To aid the WLAN
performance on a factory floor, it is thus advisable to take the following two measures: Apply means
to combat the increased delay spread (in case of IEEE .b) and additionally (for all IEEE .
systems) carefully plan the frequency layout and AP placement.
IEEE ../ZigBee has been designed specifically for sensor data and control information at
low data rates. IEEE ../ZigBee supports long battery lives. The achievable throughput is sig-
nificantly smaller than that of Bluetooth (or IEEE .). It depends heavily not only on actual
bandwidth demand but also on the chosen parameters for beacon interval and super frame setup.
The maximum overall load was found to be stable at %, while being most efficient, if the load
offered by the units was between % and %.
The best way to aid the coexistence of Bluetooth and IEEE .b is to use Bluetooth with AFH. If
this is not sufficient, hardware-related improvements and/or a common scheduler have to be added.
As IEEE .. and IEEE . are both non-hopping systems, their coexistence should be foreseen
in a respective frequency planning for both systems.
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