1. Today’s SATCOM networks have the following characteristics that havernpresented some new challengesrn1.1 Networks operate at higher frequency bands (e.g. Ku and Ka)rn1.1.1 Rain fades are deeper and more rapidrn1.2 Networks operate over wide bandwidths including operation over multiplernsatellite transponders and multiple beamsrn1.2.1 Satellite and earth terminal RF equipment have frequency dependent gain variationsrn(e.g. G/T, Gain and EIRP)rn1.2.2 Networks are subjected to unintentional and adversarial interferencern1.3 Networks support mobile terminals with small aperture antennasrn1.3.1 Adjacent Satellite Interference (ASI) has arisen as a major issue for these smallrnaperture receiversrn1.3.2 As mobile terminals move within the satellite beam contour, uplink G/T, SFD andrndownlink EIRP variations are encounteredrn1.4 When scheduling communication links within this environment, it isrninefficient to overcome these channel variations by using static link marginrn1.5 A more efficient and reliable approach is to have Channel Aware nextrngeneration SATCOM modems and waveforms.
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