Accession Number : AD0769416

Title :   A Spread Spectrum Communication Technique.

Descriptive Note : Master's thesis,


Personal Author(s) : Cocci,James Alfred

Report Date : SEP 1973

Pagination or Media Count : 89

Abstract : A practical solution to the problem of realizing a signal processing method for a covert voice communications system was the objective of the thesis. Spread spectrum technology in the form of Golay complementary sequences implemented with acoustic surface wave devices was used to achieve this processing. The resultant device was an audio transceiver MODEM in which a specially coded form of pulse code modulation (PCM) was applied to a voice signal to enable application of the spread spectrum concept. The technique exploited spread the 3 KHZ voice modulation over a one MHZ bandwidth. A method of PCM synchronization evolved which achieves system send/receive synchronization with a minimum of data loss and a minimum amount of actual hardware. (Modified author abstract)

Descriptors :   (*Communication and radio systems, Spread spectrum), Covert operations, Signal processing, Modems, Pulse code modulation, Voice communications, Acoustic equipment, Surface waves, Coding, Communication equipment, Theses

Subject Categories : Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE