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
Distribution Statement : APPROVED FOR PUBLIC RELEASE