The demonstration uses a commercially available WiMAX system with Realtek’s RTU7105 single-chip ultra-wideband MAC and PHY, supplemented by limited external processing. A downlink WiMAX signal, from base station to mobile station, is attenuated to an ultra-low level of -80dBm/MHz and is detected within seconds by the RTU7105/external processor. The RTU7105 responds immediately by transmitting at a power of less than -70dBm/MHz around the detected WiMAX signal, while maintaining the maximum regulated limit of -41.3dBm/MHz elsewhere in the same band. The technology is capable of detecting both downlink and uplink signals in any WiMAX signal format and is also applicable to 3G/4G signals. It distinguishes accurately between the WiMAX/3G/4G signals requiring protection, and spurious emissions requiring no protection. By maintaining full ultra-wideband communication within the same band as the protected service, the prototype meets the most exacting and high-performance definition of DAA, as opposed to systems that react to the detected signal by simply switching to another frequency band or ceasing communication altogether.
“Detect-And-Avoid technology holds the promise of opening up significant areas of common worldwide spectrum for ultra-wideband,” said Stephan ten Brink, UWB technical director at Realtek. “The near-term application enables UWB operation in the higher-range 3.1~4.8GHz band and in addition, DAA has significant potential to open the 6~7.25GHz and 8.5~9GHz regions for worldwide ultra-wideband operation. Looking beyond ultra-wideband, these detect-and-avoid techniques are not dependent on the characteristics of ultra-wideband and can be used to enable coexistence between any wireless technologies.”
The detection algorithms used in the demonstration are designed to be incorporated in the RTU7105 via firmware/software upgrade upon finalization of regulatory requirements.
About the RTU7105
The RTU7105 is a highly-integrated single-chip CMOS solution providing device controller support for Certified Wireless USB and IP-over-UWB, with USB2.0 and SDIO 1.2 interfaces, combined with a multi-protocol MAC and ultra-wideband PHY based on the ISO/IEC-approved ECMA-368 standard. The RTU7105 is the first ultra-wideband chip to provide support for both low (<5GHz) and high (>6GHz) bands, with support for 3.168~4.752GHz and 6.336~7.920GHz operation. The chip supports data rates up to 480Mbps and ten different logical channels per supported band, providing a full match with existing worldwide regulations. For more information on Realtek’s UWB products, visit http://www.realtek.com.tw/uwb.
Realtek Semiconductor Corp. is one of the world's leading IC providers. It designs and develops a wide range of IC products for communications network, computer peripheral, and multimedia applications. Products include 10/100/1000M Ethernet Controllers, 10/100/1000M Ethernet Switch/Gateway Controllers, 10/100/1000M Ethernet PHYceivers, Wireless LAN Controllers & AP/Router SoCs, ADSL2+ Chips, VoIP Solutions, WiMedia®-based Ultra-Wideband Chips, AC'97/High Definition Audio Codecs, Clock Generators, Card Reader Controllers, and LCD Monitor/LCD TV/DTV Controllers. With advanced design expertise in RF, analog, and mixed signal circuits, and with strong manufacturing and system knowledge, Realtek offers full-featured, high-performance, and competitive total solutions. More information on Realtek can be found on the website: www.realtek.com.tw.