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Inside job for low
power network system with reduced error rate
By
Joanne Aslett
Electronics
Times
(01/08/01
11:43 AM GMT)
Engineers
from Pennsylvania State University's Center for Information and
Communications Technology Research have demonstrated a system for use in
indoor local area communication networks.
Using
a non-line-of-sight IR wireless broadband transmissions system, the team
claims the technology offers low power and a reduced error rate.
The
system uses a link design consisting of a multi-beam transmitter with a
narrow field of view receiver, which filters out noise. It has a bit
error rate of one error per billion bits at bit rates up to a few hundred
megabits per second, and it operates at milliwatt transmitted power
levels.
Dr
Mohsen Kavehrad, professor of electrical engineering at Penn State
University, said: "This error rate is unmatched considering the
offered transmission capacity."
To
form a lan for a group of machines, each machine is equipped with a
low-power IR source and a holographic beam splitter.
A
low-power beam is separated into several narrow beams, which strike the
ceiling and walls to form an invisible grid encompassing the whole room.
The beams are reflected at the strike points so they can be used to send
and receive information.
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