Accession Number : AD0284800

Title :   FSK/PM THRESHOLD IMPROVEMENT STUDY

Corporate Author : PHILCO CORP PALO ALTO CALIF

Report Date : 15 AUG 1962

Pagination or Media Count : 1

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)

Descriptors :   *COMMAND AND CONTROL SYSTEMS, *FREQUENCY SHIFT KEYERS, *PHASE MODULATION, *COMMUNICATION AND RADIO SYSTEMS, BAND PASS FILTERS, DESIGN, DETECTORS, ERRORS, EXPERIMENTAL DATA, INTEGRATORS, LOW PASS FILTERS, MEASUREMENT, MODEL TESTS, MODULATORS, NOISE GENERATORS, PHASE SHIFT CIRCUITS, RADIO SIGNALS, RADIOFREQUENCY PULSES, RECTIFIERS, SIGNAL-TO-NOISE RATIC, SWITCHING CIRCUITS, THEORY, TIMING CIRCUITS

Distribution Statement : APPROVED FOR PUBLIC RELEASE