Apparatus for and method of broadcast satellite network return-l

Details Apparatus for and method of broadcast satellite network return-l Apparatus for and method of broadcast satellite network return-l

1994-09-16

1997-04-29

Tse, Young T.

Pulse or digital communications

Repeaters

Testing

375200, 370316, 342352, H04B 1713, H04B 719

Patent

active

056256400

ABSTRACT:
An apparatus and method for return-link transmission in direct broadcast satellite networks having a hub earth station transmitting forward-link signals, and a plurality of remote terminal stations receiving the forward-link signals and transmitting return-link spread-spectrum signals in the same transponder as the forward-link signal so that both are received at the hub station. The apparatus located at the hub station is comprised of a demodulator and a remodulator of the forward-link signals, delay as necessary for composite signals comprising the forward-link signals interfered with the return-link signals and received from a satellite, and a canceler subtracting the remodulated signals from the composite signals. The method includes a sequence of steps for synchronizing the return-link signals with the forward-link signals at the remote terminal stations, synchronizing the return-link signals with the forward-link signals at the satellite, receiving at the hub station from the satellite the composite signal having the forward-link signals interfered with the return-link signals, and canceling at the hub station the forward-link signals in the composite signals prior to spread-spectrum demodulation of the return-link signals.

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patent: 5261118 (1993-11-01), Vanderspool, II et al.
patent: 5404375 (1995-04-01), Kroeger et al.
patent: 5410750 (1995-04-01), Cantwell et al.
patent: 5414431 (1995-05-01), McCoskey

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