Noiselike amplitude and phase modulation coding for spread spect

Details Noiselike amplitude and phase modulation coding for spread spect Noiselike amplitude and phase modulation coding for spread spect

1977-11-07

1981-12-29

Birmiel, Howard A.

Pulse or digital communications

Repeaters

Testing

455 26, H04K 100

Patent

active

043086179

ABSTRACT:
A plurality of binary pseudo noise generators are used to develop a Gaussian code that appears thermal noiselike in both amplitude and phase. Half of the pseudo noise generators are provided in an in-phase section and half in a quadrature section, with each said generator output being mixed with data to be transmitted and applied to modulate a carrier, the outputs from the various sections being combined for transmission. A receiver having the same number of pseudo noise generators and generating the same code synchronously demodulates the received data.

REFERENCES:
patent: 2961482 (1960-11-01), Wieselman et al.
patent: 3366779 (1968-01-01), Catherall et al.
patent: 3518547 (1970-06-01), Filipowsky
patent: 3714573 (1973-01-01), Grossman
patent: 3728529 (1973-04-01), Kartchner et al.
patent: 3731198 (1973-05-01), Blasbalg
patent: 3808536 (1974-04-01), Reynolds
patent: 4225935 (1980-09-01), Zscheile et al.
IBM Journal, "A Comparison of Pseudo-Noise and Coventional Modulation for . . . Communications", by Blasbalg, Jul. 1965, pp. 241-255.

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