Accession Number:

ADA021767

Title:

A Spread Spectrum Communications Systems Utilizing an Umbrella Code.

Descriptive Note:

Master's thesis,

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s):

• Jaques,James Alfred , III

Report Date:

1975-12-01

Pagination or Media Count:

89.0

Abstract:

A pulse stuffing technique is used to eliminate the silent gaps in the transmission of a particular Spread Spectrum system. Unauthorized listeners now have more difficulty in recovering the message content. A two code device was built using both a pseudorandom maximal length code and a Golay complementary sequence code. The pseudorandom code was used for pulse stuffing an umbrella code and was discarded after a digital matched filter in the receiver. The Golay code was added with a Surface Acoustic Wave dispersive element and removed with a similar device used as a matched filter. Author

Descriptors:

• *SPREAD SPECTRUM
• *PULSE CODE MODULATION
• DIGITAL SYSTEMS
• SURFACE WAVES
• ACOUSTIC WAVES
• THESES
• INFORMATION THEORY
• MATCHED FILTERS
• PSEUDO RANDOM SYSTEMS
• DISPERSION RELATIONS
• PULSE COMMUNICATIONS

Subject Categories:

• Cybernetics
• Non-Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE