Transmission apparatus

Details Transmission apparatus Transmission apparatus

1991-01-04

1993-08-31

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

358142, 358 12, 358328, H04N 106, H04N 708, H04J 100

Patent

active

052415384

ABSTRACT:
Satellite transmission sometimes uses a method of modulating by a sub signal a subcarrier with a frequency set higher than that of a main signal and subjecting the main carrier to frequency modulation by the resulting baseband signal. This method is, however, accompanied by a problem of the occurrence of crosstalk from the main signal to the sub signal. This is attributable to the limited band width of the main carrier on the transmission line, allowing a correction signal equal in magnitude but negative in phase to the crosstalk to be easily prepared on the basis of the transmission line amplitude and group-delay frequency responses and the main signal. The crosstalk may be improved if this correction signal is prepared from the main signal on the transmitting side and added to the sub signal to be transmitted or if the correction signal is prepared from the demodulated main signal on the receiving side and added to the demodulated sub signal.

REFERENCES:
patent: 4199779 (1980-04-01), Nagaika et al.
patent: 4246608 (1981-01-01), Baker
patent: 4379947 (1983-04-01), Warner
patent: 4811119 (1989-03-01), Kobayashi et al.
patent: 4876614 (1989-10-01), Kaaden et al.
patent: 4882614 (1989-11-01), Kageyama et al.
patent: 4985769 (1991-01-01), Yasumota et al.
patent: 5061999 (1991-10-01), Sakashita et al.

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