.: IEEE 802.15-04/010r0 Submission Executive Summary of Results • Analysis, simulations, and measurements for wideband fixed satellite services (FSS) systems all come up with the same results − Interference from MB-OFDM waveforms is actually less than levels of interference caused by waveforms already allowed by the rules − Differences between all waveforms is on the order of 2-3 dB • There is virtually no difference between DSSS, WGN, MB-OFDM, and impulse-UWB waveforms into narrowband receivers (less than 2.5 MHz) • MB-OFDM waveforms can cause less interference than impulse radios in wideband receivers − MB-OFDM is ~ 1 dB better than 1 MHz PRF impulse radio • WGN can cause less interference than MB-OFDM into wideband receivers − Difference between MB-OFDM and WGN interference is less than 1.5 dB under realistic operating conditions WGN-like source MB-OFDM source Impulse radio source Minimum separation distance +1.5dB +1 dB Clearly allowed under current rules January 2004 Roberto Aiello, Staccato-Gadi Shor, Wisair, et elSlide 8 doc.: IEEE 802.15-04/010r0 Submission Substantial Interference Margin Exists with Current FCC Limits • FCC/NTIA Interference results for various US government systems: Table taken directly from Final R&O and using the indoor mask Most systems have substantial margin available *: Most Direct TV/DSS/DTH receivers usually do not operate in 3.7-4.2 GHz C- band.