Title: Spread spectrum modem

Abstract: Digital data having a rate R and to be transmitted is converted into a K- code, T-seconds long and delayed according to a particular N-bit word, where N=RT, whereby the code carries information in its delayed position in the T frame and not in the code itself. At a receiver station, the correlation function of the received signal is produced and the envelope detected, after which the samples are taken at each of the K possible output times. The largest output selected comprises the information on the delay of the transmitted signal.

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Inventors: Schiff, Maurice Leon (Fort Wayne, IN, US)

Application Number: 473120
Filing Date: 1974-05-24
Publication_date: 1976-01-20
Assignee: The United States of America as represented by the Secretary of the Navy (Washington, DC)
Primary Class(es): 375/343
Other Classes:
US Patent Ref:

3706933

Dec, 1972

Bidell et al.

325/42.

Other Refs:
Primary Examiner: Libman, George H.
Assistant Examiner:
Attorney: Sciascia; R. S., Rubens; G. J., Fendelman; H.