Adaptive Channel Measurement Study

The study is concerned with performance assessment, fault location, and degradation trending for PCM/TDM-FM digital transmission over DCS microwave relay systems. The reported work complements and integrates previous work to provide a comprehensive new systems-theoretic approach to channel quality monitoring called the parametric approach. In this approach, three basic quality measurement units are defined - the TQU, MQU, and RQU - which measure channel parameters at the transmitter output, receiver input, and receiver output interfaces. The potentialities of adaptive channel parameter measurement techniques are investigated with the aid of computer simulation and analysis. Consideration was given to the use of different adaptation algorithms, multipath fading, the accuracy of parameter measurement, adaptation time constants, and the estimation of error rates from the measured channel parameters. For the channel disturbance model chosen, the calculations indicate that the adaptive channel parameter measurement technique represents a viable basis for performance assessment.