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Cognitive radio functionality supports spectrum avoidance requirements

Posted: 12 Mar 2007 ?? ?Print Version ?Bookmark and Share

Keywords:UWB? DAA? transmitter? Realtek? WiMedia PHY 1.1?

Realtek Semiconductor Corp. has demonstrated a cognitive radio functionality for UWB using its RTU7010 combined single-chip radio and base band processor, currently in mass production.

This cognitive radio functionality complies with the spectrum avoidance requirements that will apply in several worldwide regulatory domains beginning in 2009, and that are directed at ensuring satisfactory coexistence of UWB devices with other wireless services.

Interference-free coexistence
The UWB transmitter responds to the presence of a protected service in its immediate vicinity by transmitting at reduced power in a narrow band centred around the protected service. By tailoring the location and width of the spectral notch, interference-free coexistence with other services is ensured.

The RTU7010 reduces the power-spectral density around the protected service to below -70dBm/MHz, while maintaining the maximum regulated limit of 41.3dBm/MHz elsewhere. This represents approximately a thousand-fold reduction in transmitted power around the protected service and meets the suppression level that will be required by regulators in Japan and Korea beginning in 2009 for devices operating in the 4.2~4.8GHz band.

Regulations addressing requirements for detection and for application of detect-and-avoid (DAA) technology to higher frequencies are currently under consideration in several regulatory domains.

WiMedia PHY 1.1 support
The RTU7010 implements all communications-related modes of the WiMedia PHY 1.1 standard in the 3.168~4.752GHz band, both mandatory and optional, including eight data rates, from 53.3Mbps to 480Mbps, and all fixed-frequency and frequency-hopped channels, along with many proprietary DAA features for managing coexistence with other wireless technologies.

The standardized WiMedia MAC-PHY Interface 1.0 is also supported. The chip integrates a digital base band processor with two full radio chains, along with the circuitry for optimal combination of the two radio inputs, and fits in a 7-by-7mm package.

The RTU7010 and RTU7010-EVK evaluation kit are currently available.

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