Accession Number : AD0777897

Title :   Performance of Soft Limiting PSK and DPSK Spread Spectrum Systems.

Descriptive Note : Final rept. Nov 72-Oct 73,

Corporate Author : PHILCO-FORD CORP PALO ALTO CALIF WESTERN DEVELOPMENT LABS DIV

Personal Author(s) : Jones,J. J. ; Huang,J. Y. ; Leong,W. K. S.

Report Date : FEB 1974

Pagination or Media Count : 192

Abstract : An analytical study and investigation is carried out to model a phase-coded spread-spectrum communication system containing a soft-limiting satellite repeater. Useful mathematical expressions are obtained for the bit error probability for both coherent PSK and differential PSK biphase data modulation combined with phase-coded biphase or quadriphase spread-spectrum modulation. A study of soft limiter models is performed, resulting in the selection of the error function amplitude characteristic to represent the soft-limiting repeater nonlinearity. The error function model provides the flexibility to represent all degrees of soft limiting from a linear repeater to a hard-limiter. Included in the study are the effects of both up-link and down-link noise as well as CW jamming at the limiter input. (Modified author abstract)

Descriptors :   *Radio links, Spread spectrum, Retransmission, Phase shift circuits, Repeaters, Satellite communications, Errors, Probability, Jamming, Computerized simulation, Computer programs, Data transmission systems, Pulse communications, Digital systems, FORTRAN

Subject Categories : Cybernetics
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE