Device and method to locally fill gaps in spotbeam satellite systems with frequency re-use
First Claim
1. A device for receiving signals from a transmission system, said system including a broadcast transmitter and a gapfiller transmitter, said device comprising:
- a first feed receiving a first signal in a first frequency band from a broadcast transmitter;
a second feed receiving a second signal in a second frequency band from a gapfiller transmitter;
a local oscillator producing a local oscillator signal;
a first multiplier coupled to the local oscillator for multiplying the local oscillator signal by a first factor producing a first multiplied signal;
a second multiplier coupled to the local oscillator for multiplying the local oscillator signal by a second factor producing a second multiplied signal;
a first mixer for mixing the first multiplied signal with the first signal producing a first intermediate frequency (IF) signal;
a second mixer for mixing the second multiplied signal with the second signal producing a second IF signal wherein the first IF signal and the second IF signal each include at least one channel having a common IF center frequency;
a filter for filtering the second IF signal producing a filtered second IF signal; and
a combiner for combining the filtered second IF signal and the first IF signal.
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Abstract
Systems and methods for transmitting and receiving diverse signals across regions using a minimum of frequency capacity and maintaining compatibility with the heritage system. A system of the invention comprises at least one broadcast transmitter for transmitting a broadcast signal in a first frequency band to a receiver, at least one gapfiller transmitter for transmitting a gapfiller signal in a second frequency band to the receiver and at least one set of reuse transmitters for transmitting a plurality of spotbeam signals in the first frequency band to define coverage regions and at least one coverage gap where the spotbeam signals are not transmitted. A method of the invention comprises receiving a first signal, receiving a second signal, generating a first intermediate frequency (IF) signal from the first signal, generating a second IF signal from the second signal, filtering the second IF signal to produce a filtered second IF signal and combining the filtered second IF signal and the first IF signal.
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Citations
5 Claims
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1. A device for receiving signals from a transmission system, said system including a broadcast transmitter and a gapfiller transmitter, said device comprising:
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a first feed receiving a first signal in a first frequency band from a broadcast transmitter; a second feed receiving a second signal in a second frequency band from a gapfiller transmitter; a local oscillator producing a local oscillator signal; a first multiplier coupled to the local oscillator for multiplying the local oscillator signal by a first factor producing a first multiplied signal; a second multiplier coupled to the local oscillator for multiplying the local oscillator signal by a second factor producing a second multiplied signal; a first mixer for mixing the first multiplied signal with the first signal producing a first intermediate frequency (IF) signal; a second mixer for mixing the second multiplied signal with the second signal producing a second IF signal wherein the first IF signal and the second IF signal each include at least one channel having a common IF center frequency; a filter for filtering the second IF signal producing a filtered second IF signal; and a combiner for combining the filtered second IF signal and the first IF signal. - View Dependent Claims (2, 3, 4, 5)
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Specification