Multiplex communications – Duplex – Communication over free space
Patent
1995-08-21
1998-12-08
Pham, Chi H.
Multiplex communications
Duplex
Communication over free space
370319, 455 121, 342352, H04J 400
Patent
active
058480609
ABSTRACT:
A satellite communications system employs a multiple element antenna for receiving signals on a first frequency band and relaying the signals to a ground station on a second frequency band. The system includes a downconvertor for converting signals received at each of the multiple antenna elements on the first frequency band to corresponding baseband signals, and a multiplexor for time-division multiplexing the corresponding baseband signals to form a multiplexed sample stream. The system also includes a modulator for modulating a carrier in the second frequency band with the multiplexed sample stream and transmitting the modulated carrier to the ground station. In exemplary embodiments, the downconvertor comprise a quadrature downconvertor producing an I and a Q baseband signal. The satellite relays signals received from the ground station using a demultiplexor in a similar manner.
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Ericsson Inc.
Ngo Ricky Q.
Pham Chi H.
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