FSK/PM THRESHOLD IMPROVEMENT STUDY
Abstract
An experimental study was undertaken to determine means of improving the threshold of the Adven FSK/PM command link. Following the construction and calibration of a proper command link simulator, the parameters, including transmitter phase deviation, modulator tone coherence and bit sequencing from the encoder, were varied in order to determine their effects on system performance. This performance was measured in terms of the pre-detection S/N as a function of the bit error rate. In addition to these S/N versus the bit error rate curves, considerable supporting data were obtained in the form of time waveform photographs, spectrum photographs and plots, and system response curves. The results indicate the desirability of using coherent tones and premodulation filtering in the transmitter as well as the obvious need for an optimum detector. Theoretical investigations of the bit sync problem in the receiver emphasize the need for additional work to investigate a number of interesting detection schemes. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 15, 1962
- Accession Number
- AD0284800