Digital communications system with immunity to frequency...

Details Digital communications system with immunity to frequency... Digital communications system with immunity to frequency...

H - Electricity

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325/28

H04B 3/04 (2006.01) H04B 7/22 (2006.01) H04L 27/10 (2006.01) H04L 27/20 (2006.01) H04L 27/227 (2006.01)

Patent

CA 1057356

DIGITAL COMMUNICATIONS SYSTEM WITH IMMUNITY TO FREQUENCY SELECTIVE FADING Abstract of the Disclosure A digital communications system with increased resistance to frequency selective fading. Digital signals to be transmitted are phase shift modulated upon a spectrum spreaded carrier. The carrier is generated by mixing the output of a band spread oscillator with a locally generated IF oscillator signal. The signal thus obtained is divided into transmission periods, each of which is longer than the maximum spreading time of the nonlinear transmission medium. The increased bandwidth occupancy thus obtained increases the immunity of the trans- mitted signals to frequency selective fades moving across the allocated bandwidth. The signals are received by a differentially adaptive receiver which automatically adjusts its response to the envelope of received signals.

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