Performance of Soft Limiting PSK and DPSK Spread Spectrum Systems.

摘要

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)