ADAPTIVE NOISE MINIMIZER.
Abstract
This report describes and evaluates equipment capable of adaptively modifying the modulation index of a troposcatter link to continuously optimize the receiver signal-to-noise ratio. An examination into the theory of noise in communications channels led to certain novel design objectives. Equipment was evolved to implement these concepts and explore possible modes of operation. Tests on the RADC Caribbean Test Bed showed that the sensing mode known as TAGGING was the most successful, with resultant digital error rates showing improvement factors varying from 2 to 10, depending on path conditions. This program has shown that the Adaptive Modulation Index technique is a feasible and practical approach for improving the error rate in a tropo FDM/FM system. System performance can now be significantly improved without the need for resorting to costly and complex brute force methods. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1966
- Accession Number
- AD0484008