Packet transmission of digital signals over a high capacity channel, particularly over a satellite broadcasting channel

摘要

For full time transmission of digital signals, in the form of successive bits, over a satellite broadcasting channel, two multiplexes each having a bandwidth substantially half that of the channel are transmitted on two quadrature carriers, with four phase type modulation and with symbols offset on the two carriers. At reception one of the multiplexes is demodulated by phase demodulation, phase differential demodulation or phase coherent demodulation, with physical separation of one binary element out of two.