NITC develops Wi-Fi prototype for TV white space use
News On Japan via broadcastengineering.com -- Oct 20
Japan's National Institute of Information and Communications Technology (NICT) has developed what is believed to be the world's first Wi-Fi prototype in TV White Spaces (TVWS) based on the IEEE 802.11af draft specification.
IEEE 802.11af is currently the only task group (TG) under the IEEE 802.11 working group for Wi-Fi technologies in the TVWS - channels in the television band between 470MHz and 710MHz that are unused in given locales. The developed system is the first prototype that verifies the physical (PHY) and media access control (MAC) layer design of the draft specification, following the worldwide trend of prompting the TVWS for wireless communication systems.
Around the world, government regulators have launched initiatives to make more efficient use of spectrum. In the United States, the FCC has changed its rules to allow unlicensed RF devices to transmit in TV white spaces, provided they comply with rules set up to prevent interference to broadcast signals.
Wireless mics and other low-power auxiliary transmitters used for remote newsgathering, sports coverage and by the entertainment industry also transmit in TV white spaces. The FCC has set up two channels in the UHF band near channel 37 for wireless mic use at major event and production venues to protect them from white space devices. But given the ad hoc nature of remote TV news coverage from unpredictable locations, use of white spaces by unlicensed devices has remained a concern.
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