Interference from UWB operations under the Multiband OFDM Allianc...
Interference from UWB operations under the Multiband OFDM Alliance (MBOA) Special Interest Group’s proposal would be at 4 times the power of other UWB systems, the Coalition of C-band Constituents told the FCC. The group was responding to a…
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request to the FCC by MBOA for a waiver of certain measurement procedures for frequency- hopping orthogonal frequency domain modulation (OFDM) because it said the existing tests didn’t account for the new technology its system uses. The Satellite Industry Assn. (SIA) asked the Commission to deny the waiver because that would mean inaccurate results (CD Sept 30 p6). The Coalition submitted a filing and engineering study that supported those concerns and said the resulting interference would increase, though pulses would last only 242.2 nanosec., “while seeming to be operating in a compliant manner.” MBOA’s proposal -- averaging the signals instead of comparing the length of quiet periods to periods between pulses -- would “hide the fact that [it] has gotten a four-fold power increase over competing UWB systems by virtue of a defective measurement technique,” the Coalition said.