# Presentation: 157129

## ITU–R Task Group 1/8

**“****Bush Administration’s Commitment to Responsible Development and Deployment of Ultra Wideband”**
**Michael D. Gallagher**
**Acting Assistant Secretary**
**U.S. Department of Commerce**
**National Telecommunications and Information Administration**
- www.ntia.doc.gov
- Boston, Massachusetts USA
- June 10, 2004

## UWB Signals Using Fixed Time-Base Dither

## Administration’s Commitment to Spectrum Innovation 

- UWB
- Broadband over Power Line
- Third Generation Wireless
- Additional Spectrum for Wireless Device Applications (5 GHz U-NII)
- Expanding Opportunities for Spectrum Use at Higher Frequencies (70/80/90 GHz)
- President’s Spectrum Initiative

## Current State of Affairs

- Initial controversy giving way to thoughtful deployment
- Difficult three and a half year domestic rulemaking process (1,154 public comments)
- NTIA reports served as the technical basis for establishing the service rules for UWB devices
- February ’02 U.S. regulations authorizing ultra-wideband technologies on a non-interference, non-protected basis
- Increasing worldwide interest in UWB technologies
- Imaging Systems, Vehicular Radar Systems, High Data Rate Communication Systems
- Many other administrations looking to U.S. regulations when developing their own

## Benefits of UWB Applications

- Avoiding automobile collisions or mitigating injuries using vehicular radars in conjunction with other safety features
- Providing very high bandwidth wireless home networking for multiple consumer electronics devices
- Supporting rescue efforts in collapsed buildings using through-wall imaging
- Ensuring integrity of airport runways using ground penetrating radars to detect runway cracks

## U.S. Approach to Technical Assessment of UWB Compatibility

***Characterization*** of UWB emissions
***Compatibility*** studies assessing the interference potential of UWB emissions to authorized radiocommunication systems
***Compliance*** measurement procedures to accurately portray interference potential of emissions from UWB devices

## Characterization of UWB Emissions

- Measured the temporal and spectral characteristics of various UWB signals
- Developed measurement methods using commercial off-the-shelf test equipment
- Determined that UWB signals fall within the known models for interfering signals
- Continuous wave model
- Noise model
- Pulse model

## Compatibility with Authorized Radiocommunication Systems

- Susceptibility of receivers
- Measurements (GPS)
- ITU–R Recommendations
- ICAO and RTCA standards
- Operational scenarios
- Minimum separation distance
- Antenna coupling
- Propagation model
- Other factors
- Acceptable emission levels

## Development of Emission Masks

- Based on the interference potential of the UWB device application
- Six distinct emission masks
- Ground penetrating radar systems
- Other imaging systems (wall, through-wall, and medical)
- Surveillance systems
- Vehicular radar systems
- Indoor communications systems
- Outdoor (handheld) communications systems

## Emission Mask for Indoor UWB Devices

## Compliance Measurement Procedures

- Detector
- Peak detector
- RMS detector
- CISPR detector (below 960 MHz)
- Measurement bandwidth
- Varies with detector type and frequency
- Measurement interval (RMS averaging time)
- Application-based variations (e.g. GPR emissions radiated into sand pit)

## Summary

- U.S has taken a responsible but aggressive approach to the development and deployment of UWB technology.
- The process was long and the arguments highly technical, but we worked hard to find answers.
- The NTIA technical studies served as the basis for the development of the emission masks that will permit the safe and effective authorization of UWB technology.
- NTIA measurement and analysis reports are available at: _[http://www.ntia.doc.gov/osmhome/osmhome.html](http://www.ntia.doc.gov/osmhome/osmhome.html)_
- U.S. rules successfully strike the balance of responsible deployment to harvest the benefits of UWB within our economic and homeland security environment.

## Relationship to Task Group 1/8 Activities

- Development of ITU–R Recommendations to provide guidance to administrations
- Characteristics of UWB systems
- Compatibility with radiocommunication services
- Framework for national UWB regulations
- Measurement techniques
- ITU–R Report containing detailed compatibility studies