Hybrid modulation satellite communication system

Details Hybrid modulation satellite communication system Hybrid modulation satellite communication system

H - Electricity

04

B

325/6

H04B 7/155 (2006.01) H04B 7/185 (2006.01) H04L 5/02 (2006.01)

Patent

CA 2015105

In a satellite communication system including a plural small earth stations (3-8), a relay earth station (2) and a satellite (1), information transmission is undertaken by primary modulation of carrier wave, and transmission of operation status of each small earth station (3-8) is carried out by secondary modulation of said carrier wave. Primary modulation may be BPSK or multiphase PSK (MPSK), and secondary modulation may be PSK, ASK or FSK. Said operation status may be receive signal quality in each small earth station, and the relay earth station (2) may adjust transmit power to said small earth station such that the receive signal quality at small earth stations satisfies desired criteria irrespective of rain attenuation.

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