PCS has introduced a comprehensive line of UPB-based
lighting controls, PulseWorx™, which set a new standard
for reliable, cost effective lighting control in the home. In
addition, PCS has licensed the technology to a number of commercial
and residential equipment providers, enabling a standard for
reliable powerline control.
PCS' powerline communication technology utilizes
a PPM (Pulse Position Modulation) encoding/decoding method.
The physical layer method is a very different scheme than the
modulated/demodulated RF techniques used by other manufacturers.
A series of pulses are produced in rough synchronization with
the main line voltage frequency. The relative position of each
pulse may vary over a small range of time or position relative
to the previous pulses. Because the data is encoded into these
differences in position, the method of modulation is called
Pulse Position Modulation or PPM. The function of a UPB transmitter
is to produce a series of precisely time pulses that encode
the digital information to be transmitted. The function of the
UPB receiver is to detect the pulses, determine the positions,
separate the pulses from noise and finally produces the decoded
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