Accession Number : ADA019840

Title :   Theoretical Performance Models for a Coherent Frequency-Hopped/Pseudonoise Modem.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING

Personal Author(s) : Marshall,Veloris A. , III

Report Date : DEC 1975

Pagination or Media Count : 75

Abstract : Theoretical performance models for a 100-MHz coherent frequency-hopped/pseudo (CFH/PN) breadboard modem are formulated and evaluated. The modem uses surface wave devices for signal generated and detection and can process digital data at 2240-bps. Performance models for the data and sync detector are formulated assuming perfect phase reference and white Gaussian noise and using coherent and noncoherent detection theory respectively. The data detector model predicts the error probability of a five-bit majority vote on coherently detected, differentially encoded CFH/PN subframe signals. The sync detector model predicts the probability of losing sync when noncoherently detecting the same signals. The performance of the sync detector is consistent with preliminary RADC measurement.

Descriptors :   *Modems, Models, Spread spectrum, Pseudo noise systems, Signal processing, Acoustic waves, Surface waves, Theses

Subject Categories : Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE