[opendtv] Re: News: Ultrawideband heralds zippier wireless connections
- From: Henry Baker <hbaker1@xxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Thu, 07 Oct 2004 07:56:55 -0700
Bert is right about the limited range of the current
crop of UWB devices. Their primary goals are wireless
versions of USB and Firewire/iLink. The idea is to bring
your laptop or camera to within a few feet of another
device and communicate at USB/Firewire type speeds without
requiring a cable.
While "ultrawideband" is generically suitable for longer
range tasks, including passing information around the
house, I think some regulatory changes and/or technical
improvements will be required in order to get sufficient
range.
At 07:03 AM 10/7/2004, Manfredi, Albert E wrote:
>Uh, no. UWB is considered a personal area network (PAN),
>considerably shorter range than Wi-Fi, and I very much
>doubt it can make it throughout a house. Perhaps
>throughout a living room, depending which variant
>you're talking about, and depending what sort of
>interference problems crop up and how they're solved.
>
>Last I heard, the MBOA approach was capable of 10
>meters, but created a potential interference problem
>due to the peak to average ratio issue with OFDM.
>And the CDMA variant was capable of 4 meters. But
>these distances are for unobstructed transmissions.
>
>Problem is, the ultrawide band means that the upper
>frequencies of a signal stream will become attenuated
>first as range goes up. Which will require a reduction
>in bit rate or in range, to compensate for the loss.
>
>Another way to say it is that as range and
>obstructions go up, the "ultrawide" aspect goes down.
>
>Bert
>
>-------------------------
>http://www.usatoday.com/tech/wireless/data/2004-10-06-ultrawideband-preview_x.htm
>
>Ultrawideband heralds zippier wireless connections
>
>By Duncan Martell, Reuters
>
>SAN FRANCISCO - Think of it as Wi-Fi on steroids.
>
>[ ... ]
>
>Aesthetically conscious consumers would appreciate the
>high-speed wireless streaming of HDTV signals through
>the home - ...
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