Advanced Monitoring Techniques for Digital Communication Systems.
Abstract
This report considers the problem of monitoring digital communication systems. Possible monitoring techniques are reviewed and a group of different methods, which will completely define the system state, is chosen. A new format violation type indication is suggested and analyzed for the seven-level partial response/FM system. Four-level FM, seven-level partial response/FM and quadrature partial response types of modulation are reviewed and a group of eleven generic faults are chosen as representative malfunctions for communication links using such modulation methods. The response of each of six monitors to each of the generic faults is determined theoretically. Simulation studies are conducted for a seven-level partial response/FM system using three monitors and a selection of typical faults. A method for processing error rate monitor outputs to obtain a fault alarm is worked out and the results are verified with simulation studies. Recommendations are given for a group of five monitors for a seven-level partial response/FM system. Fault isolation cannot be accomplished as well for the four-level FM system because format violation monitors cannot be used. A similar result pertains to the QPR system, although some type of format violation monitor may be possible for this type system. Fault detection can be accomplished for FM and QPR in the same manner as for partial response systems.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1977
- Accession Number
- ADA037082
Entities
People
- B. J. Leon
- D. J. Schaefer
- J. L. Hammond
- S. S. Liu
Organizations
- Georgia Tech