NTIA Report 05-429 titled "Interference Potential of Ultrawideband Signals, Part 2" is the second of three reports.
The UWB CRADA was established between NTIA's Institute for Telecommunication Sciences (ITS) and Motorola/Freescale in early 2004.
The program's purpose was to assess the effects of two types of UWB on C-band satellite digital television receivers. The two types of UWB are direct sequence (DS) UWB and MB-OFDM (multiband orthogonal frequency-division multiplex) UWB. They are competing architectures that are not interoperable with one another.
The analysis in Report, Part 2 is not based on actual UWB signals, but on gated-noise with the timing characteristics that describe the two UWB signals. Report, Part 3 will show the effects of actual DS and MB-OFDM UWB signals on C-band satellite digital television receivers.
Data in the report show that the amount of interference a UWB signal (represented by gated-noise in this analysis) causes in a C-band satellite receiver is dependent on the timing structure of the UWB signal, the bandwidth of the receiver, the digital coding used in the receiver, and the level of forward error correction used in the receiver.
The measurements included in the Report, Part 2 considered seven possible implementations of the MB-OFDM signal architecture that are permitted under the current FCC waiver granted in March, 2005.
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