Spectrally efficient digital modulation method and apparatus

Details Spectrally efficient digital modulation method and apparatus Spectrally efficient digital modulation method and apparatus

1987-01-28

1988-04-12

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 39, 455 60, H04L 2720

Patent

active

047379693

ABSTRACT:
A method and apparatus are provided for generating a uniquely shaped prototype digital pulse which is transmitted with minimal frequency spectrum consumption and yet a relatively high bit rate. Such uniquely shaped digital pulse is stored in a memory included in a transmitter until transmission is desired, at which time a positive of the pulse is transmitted to correspond to a first logic level or the negative of the pulse is transmitted to correspond to a second logic level.

REFERENCES:
patent: 3378771 (1968-04-01), Van Gerwen et al.
patent: 4389722 (1983-06-01), Hofmeister
patent: 4658405 (1987-04-01), Yazuka et al.

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