|Radio frequency interference|
Radio frequency interference (RFI) from internal and external sources: There is no end to the possibilities here. Typical earth station and satellite antennas provide some selectively for the signal of interest (SOI). Any other signal in the area and on the same or adjacent frequency will ride along. The principal effect is to reduce the effective C/N at the receiver. This can be calculated based on assumed antenna isolation (sidelobe and cross-polarization). Depending on their frequency and strength, they can also interact via the system nonlinear elements to produce signals in the wrong place. In the case of the multi channel transponder, all other channels are potential RFI sources to the SOI. There may also be external interference signals such as radar systems and ground based microwave systems. All of these can be developed in the simulation and added to the SOI to investigate their effect.
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