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Speed-Merchant UWB Ushers In Wireless Video
Despite its short range (less than 10 m), Ultra-Wideband and its up-to-1-Gbit/s data rate is a perfect fit for wireless streaming video.
Date Posted: November 17, 2005 12:00 AM
One issue that continues to bother some is competition from other wireless technologies, especially 802.11a/g and the forthcoming 11n standard. Wi-Fi already can transmit video because the upper data rate of 54 Mbits/s is plenty fast enough, and even its range is above UWB. The problems are complexity and power. The latter isn't a factor in most consumer products that plug into the ac line, though.
The 802.11n standard, still under negotiation in the IEEE Task Group N, will feature data rates from 100 to 250 Mbits/s and higher at a range of up to 50 to 100 m using multiple-input multiple-output (MIMO) antenna technology. could be a threat to UWB in ac-powered products.
A new group, the Enhanced Wireless Consortium (EWC), consists of 27 companies looking for a fast solution to the standard delay. The two main within the IEEE working on this TGn Sync and WwiSE. To date, still no consensus, and little progress has been made of late. The hopes to move the process forward to a final standard or take off on own, like the Widmedia group.
The standard put forth by EWC combines features of both standards proposals now being debated in the IEEE. It supports data rates to 600 Mbit/s using the 20-MHz assigned bands or 40-bands where the spectrum is available. It's compatible with 802.11a/g, and supports spatial multiplexing for simultaneous transmission using up to 4 antennas. With "big gun" Wi-Fi companies like Atheros, Broadcom, Cisco, DLink, Intel, and others, the pressure is on finalize 802.11n fast or the EWC will go its own way. There's no both technologies will vie for consumer video applications, and which will come out on top is still to be determined.
WHO'S WHO IN UWB Lots of companies are addressing the UWB opportunity. Now, most are ready to announce chip sets and related products. End products should be available for the first time in 2006. The table (p. 42) provides a quick overview of those participants, as well as the various organizations that support the UWB field.
See Figure 4