Telecommunications – Carrier wave repeater or relay system – With frequency conversion
Reexamination Certificate
2011-05-10
2011-05-10
Anderson, Matthew D. (Department: 2618)
Telecommunications
Carrier wave repeater or relay system
With frequency conversion
C455S063100, C455S067130, C455S296000, C455S315000, C455S310000, C455S311000, C455S317000, C455S283000
Reexamination Certificate
active
07941093
ABSTRACT:
A method for frequency conversion within a satellite-based repeater system. An uplink radio frequency signal having a frequency fRFis received. A first and at least a second local oscillator signal having frequencies fL01and fLO2, respectively, is generated. The uplink signal is mixed at a first frequency conversion stage with the first local oscillator signal to generate an intermediate signal having a frequency fMF. The intermediate signal is mixed at a second frequency conversion stage with the at least second local oscillator signal to generate a downlink signal having a frequency fIF. The generation and mixing of the signals are performed such that:in-line-formulae description="In-line Formulae" end="lead"?fLO1 and fLO2>fRFand fIFin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?fMF=fLO1−fRF, andin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?fIF=fLO2−fMF.in-line-formulae description="In-line Formulae" end="tail"?
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European Search Report—Mar. 27, 2008.
Anderson Matthew D.
Franklin Eric J.
RUAG Space AB
Safaipour Bobbak
Venable LLP
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