Cellular/satellite communications system with improved frequency re-use
First Claim
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1. A coherent satellite transponder for transponding a plurality of signals received from a ground station comprising:
- a corresponding plurality of receiving means for receiving said signals using frequency or phase modulation on a corresponding number of carrier frequencies and demodulating them to produce video signals;
coherent upconverting means for translating each of said video signals to a new carrier frequency while preserving their relative amplitude and phase characteristics;
transmitter-antenna means for amplifying each of said translated signals to a desired transmit power level and transmitting them using a corresponding antenna means.
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Abstract
Radiocommunication systems and methods for minimizing co-channel interference are disclosed. The systems and methods are applicable to, for example, landmobile communications, satellite communication systems and hybrids thereof. Signal processing using matrix models of received and transmitted signals provides for minimized interference.
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Citations
16 Claims
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1. A coherent satellite transponder for transponding a plurality of signals received from a ground station comprising:
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a corresponding plurality of receiving means for receiving said signals using frequency or phase modulation on a corresponding number of carrier frequencies and demodulating them to produce video signals; coherent upconverting means for translating each of said video signals to a new carrier frequency while preserving their relative amplitude and phase characteristics; transmitter-antenna means for amplifying each of said translated signals to a desired transmit power level and transmitting them using a corresponding antenna means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A coherent satellite transponder for transponding signals received from a plurality of ground stations comprising:
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receiver-antenna means having a plurality of antenna elements for receiving combinations of said signals from said ground stations; coherent downconverting means for translating each of said received combinations to a corresponding at least one video signal while preserving relative phase and amplitude characteristics between said combinations of said signals received by said plurality of antenna elements; transmitter-modulator means for modulating each of said video signals onto a corresponding carrier frequency using frequency or phase modulation, amplifying them to desired transmit power levels and transmitting them using transmit antenna means. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification