Interference effects induced by an adjacent terrestrial microwave system on the performance of a triple-site dual polarized Earth-space system

Frequencies above 10 GHz are of high importance in current satellite systems. In this band of frequencies attenuation and depolarization caused by rain are the basic limiting factors affecting the performance of these systems in heavy rain climatic regions. Site diversity protection is a mitigation technique for reducing the link fade margins. In some severe cases such as operation in the Ka band (20/30 GHz), the double-site diversity can be proved to be inadequate leading to the employment of triple diversity. In addition, the reliable design of these systems requires the consideration of interference effects. Because of the inevitably necessity for establishment of operating satellite Earth stations and terrestrial microwave systems at the same location, the following interference problem: “a triple-site dual-polarized system interfered by an adjacent terrestrial microwave operating at the same frequency ”, addressed by Hosoya et al. (1980) will be usual in the near future. In this case, the degradation of the carrier-to-interference ratio (CIR) is due to differential rain attenuation along with cross polarization. In this paper, an analytical propagation model for the prediction of the (CIR) statistics is presented