H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 7/185 (2006.01)
Patent
CA 2158391
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 comprises 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.
Golding Leonard S.
Palmer Larry C.
Hughes Electronics Corporation
Sim & Mcburney
LandOfFree
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