| 摘要 |
A method for frequency conversion within a satellite-based repeater system, comprising the steps of receiving an uplink radio frequency signal (RF) having a frequency f RF, generating a first (LO1) and at least a second (L02) local oscillator signal having frequencies f LO1 and f LO2, respectively, mixing at a first frequency conversion stage said uplink signal (RF) with said first local oscillator signal (LO1) to generate an intermediate signal (MF) having a frequency f MF , and, at a second frequency conversion stage, mixing said intermediate signal (MF) with said at least second local oscillator signal (LO2) to generate a downlink signal (IF) having a frequency f IF , wherein the generation and mixing of said signals (LO1, LO2, RF, MF) are performed such that: f LO �¢ 1 �¢ and f LO �¢ 2 > f RF �¢ and f IF f MF �¢ = f LO �¢ 1 - f RF , and f IF �¢ = f LO �¢ 2 - f MF
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