Product category:
Communications ICs (Wireless)
News Release from: Realtek Semiconductor Corp | Subject: Realtek RTU7105
Edited by the Electronicstalk Editorial
Team on 14 September 2007
Detect and avoid system showcased
Realtek's new system combines WiMAX ultra-low-level signal detection with advanced avoidance techniques.
Realtek Semiconductor has demonstrated a complete detect-and-avoid (DAA) prototype system enabling full simultaneous operation of ultra-wideband devices with WiMAX systems at the CEPT Electronic Communications Committee (ECC TG3) meeting in Brest, France, on 13th-14th September 2007 DAA technology seeks to detect the presence of licensed and protected services and to adapt dynamically in order to provide no interference to the licensed service
This article was originally published on Electronicstalk on 29 May 2007 at 8.00am (UK)
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DAA is a critical enabling technology for ultra-wideband systems due to the large UWB occupied bandwidth and the corresponding need to protect many licensed services.
DAA functionality will be required for all ultra-wideband operation in the 3.1-4.2GHz band, and will be phased in for the 4.2-4.8GHz band between 2009 and 2011 in the EU, Japan, and Korea.
Regulations addressing detailed requirements for detection of protected services and application of avoidance techniques are currently under development in each of these regulatory domains.
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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 or 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 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 co-existence between any wireless technologies".
The detection algorithms used in the demonstration are designed to be incorporated in the RTU7105 via firmware/software upgrade upon finalisation of regulatory requirements.
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 (less than 5GHz) and high (over 6GHz) bands, with support for 3.168-4.752GHz and 6.336-7.920GHz operation.
The chip supports data rates up to 480Mbit/s and ten different logical channels per supported band, providing a full match with existing worldwide regulations.
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