A novel carrier slot setting plan is proposed to reduce intermodulation (IM) effects for satellite SCPC (single channel per carrier) systems. Carrier slots are divided into blocks and slight frequency gaps are set among blocks. This setting introduces frequency offset between the center frequencies of carrier slots and the center frequencies of some of IM components. A method to derive optimum division to get the upper bound of improvement of the C/IM ratio in the worst channel is developed. The results show that the proposed setting plan achieves significant improvement of IM effects at a cost of only slight bandwidth expansion even in fully loaded SCPC systems.
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