Single local oscillator sharing in multi-band Ka-band LNBS

摘要

A method, apparatus and system for sharing a local oscillator in a satellite signal delivery system is disclosed. A system in accordance with the present invention comprises a first set of satellite signals broadcast in a first frequency band, wherein the first set of satellite signals is downconverted to a first intermediate frequency band of signals, a second set of satellite signals broadcast in a second frequency band, wherein the second set of satellite signals is downconverted to a second intermediate frequency band of signals and a third intermediate frequency band of signals using the shared local oscillator, a first signal stacker for stacking the second intermediate frequency band of signals and the third intermediate frequency band of signals into a stacked signal, a second signal stacker for stacking the first intermediate frequency band of signals with the stacked signal into a delivery signal, a distribution unit, coupled to the combiner, for distributing the delivery signal to a plurality of outputs, and at least one receiver, coupled to an output of the plurality of outputs, wherein the at least one receiver processes at least the first intermediate band of signals in the delivery signal.

主权项

1. A system for sharing a local oscillator used to downconvert signals in a satellite signal delivery system, comprising:
a first set of satellite signals broadcast in a first frequency band, wherein the first set of satellite signals is directly downconverted to a first intermediate frequency band of signals using a first local oscillator by mixing the first set of satellite signals with an output of the first local oscillator at a local oscillator frequency; a second set of satellite signals, wherein the second set of satellite signals is different than the first set of satellite signals, being broadcast in a second frequency band wherein the second frequency band is different than the first frequency band, wherein the second set of satellite signals is directly downconverted to a second intermediate frequency band of signals and a third intermediate frequency band of signals using a shared local oscillator at a shared local oscillator frequency by mixing the second set of satellite signals with outputs of the shared local oscillator, wherein the second intermediate frequency band and the third intermediate frequency band are different than the first intermediate frequency band, a frequency of the shared local oscillator being selected such that the first intermediate frequency band, the second intermediate frequency band, and the third intermediate frequency band are separated in frequency and the first set of satellite signals and the second set of satellite signals are downconverted at the same time; a first signal stacker for stacking the second intermediate frequency band of signals and the third intermediate frequency band of signals into a stacked signal; a second signal stacker for stacking the first intermediate frequency band of signals with the stacked signal into a delivery signal; and a distribution unit, coupled to the second signal stacker, for distributing the delivery signal to a plurality of outputs.