[opendtv] Re: Daily Wireless - Wi-LAN's W-OFDM full mobility
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 5 Aug 2004 16:17:59 -0400
I'm not sure why this concept periodically bubbles to the
surface again amid media hype.
IEEE 802.16 was originally conceived as a fixed LMDS/MMDS
system, providing a lot of options for link layers and for
media access techniques, and operating in wide 20, 25, or
28 MHz channels in the 10 to 66 GHz bands. The idea was to
make that last mile easier, with a wireless link, up to
134 Mb/s. But the high frequencies make for LOS access
only.
Okay, so they want to show the system can support mobile
users?
It appears they lowered the frequency to the range of
802.11a, if I'm reading this right. Probably in an
effort to make the scheme less touchy.
It appears they are providing 32 Mb/s, meaning the
modulation must be QPSK in a 20 MHz channel. And
therefore 1.6 b/s/Hz spectral efficiency.
So why is this so impressive? If they create a
cellular system out of this, with even coverage,
haven't they just clobbered the spectrum used
by 802.11a in the entire area they want to cover?
Bert
> http://www.dailywireless.org/index.php
>
> *Mobilized 802.16* Thursday, August 05 @ 07:11:16 PDT
>
> 802.16 News
> <http://www.dailywireless.org/modules.php?name=3DNews&new_topic=3D29>
>
> Litigious Wi-LAN <http://www.wi-lan.com/>, today announced it has
> successfully demonstrated its LIBRA 5800 TM
> <http://www.wi-lan.com/products/libra5800_specs.htm>
> operating in a full
> mobility environment, including both high speed (vehicular)
> and seamless
> hand-off capability <http://www.wi-lan.com/news/latest.htm>.
>
> The demonstration is performed using equipment based exclusively on=20
> Wi-LAN's W-OFDM <http://www.wi-lan.com/technology/wofdm.htm>
> rather than an 802.16e "standard"
> <http://www.dailywireless.org/modules.php?name=3DNews&file=3Dartic
> le&sid=3D2814>
> which is still in process at the IEEE and is not likely to reach
> consensus until the end of the year at the earliest.
>
> <http://www.dailywireless.org/modules.php?name=3DNews&file=3Dartic
> le&sid=3D2694>
>
> Backhauled by Wi-LAN's 3.5GHz LIBRA 3000
> <http://www.wi-lan.com/products/libra3000_specs.htm>, two 5.8
> GHz LIBRA
> 5800 TM <http://www.wi-lan.com/products/libra5800_specs.htm> Access
> Units with hand-off capability provided wireless connectivity
> of 32 Mbps
> to a Mobile Unit traveling in excess of 100 km/hour (62 mph). The
> demonstration was shown over a 3 km stretch of highway north of the
> Calgary international airport.
>=20
> The LIBRA 5800 TM product line, a joint development between=20
> Wi-LAN and=20
> Wellink=20
> <http://home.businesswire.com/portal/site/google/index.jsp?ndm
> ViewId=3Dnews_view&newsId=3D20040309005229&newsLang=3Den>,=20
> a leading integrator of high-speed telecommunication systems, is=20
> designed to address the growing Intelligent Transportation=20
> System (ITS)=20
> market, including Public Safety, Homeland Security and onboard=20
> multimedia service.
>=20
> Meanwhile, Korea's Ministry of Information and Communication (MIC)=20
> approved the IEEE 802.16 standard as Korea's base technology=20
> <http://www.wirelessweek.com/article/NEa0729239.7iw?verticalID
> =3D33&vertical=3DRegulatory>=20
> for portable wireless broadband access, last month and set aside=20
> spectrum for Wi-Bro in the 2.3GHz band=20
> <http://neasia.nikkeibp.com/wcs/leaf/CID/onair/asabt/news/311064>.=20
> Communication speeds will be up to 30Mbps, or up to 50Mbps using=20
> multiple-input, multiple-output (MIMO) technology based on multiple=20
> antennas. Korea plans to move forward with the technology as=20
> progress is=20
> made with IEEE 802.16 standardization.
>=20
> Although the concept is still in its development stages, the portable=20
> Internet, named by Korean officials as WiBro (wireless broadband), is=20
> designed to provide high-speed access of a maximum 1Mbps to receiver=20
> devices moving at speeds of 60 to 70 kilometers per hour. The=20
> government=20
> aims for commercial services in 2006 and expects 10 million=20
> customers by=20
> 2008.
>=20
> Korea sees Wi-Bro as a stepping stone toward fourth-generation mobile=20
> communications. The objective of 4G is to deliver data rates of up to=20
> 100Mbps in mobile situations, and up to 1Gbps in situations=20
> where users=20
> are stationary.
>=20
> Intel and Proxim=20
> <http://www.dailywireless.org/modules.php?name=3DNews&file=3Dartic
> le&sid=3D2694>=20
> recently announced plans for WiMAX solutions based on IEEE 802.16 for=20
> both fixed-line and portable broadband access.
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