Accession Number:

AD0618330

Title:

HF TIME-AND FREQUENCY-DISPERSION EFFECTS-EXPERIMENTAL VALIDATION OF AN FSK ERRORRATE MODEL

Descriptive Note:

Technical rept.

Corporate Author:

STANFORD RESEARCH INST MENLO PARK CA

Report Date:

1965-03-01

Pagination or Media Count:

223.0

Abstract:

An experiment has been conducted to determine the sensitivity of an HF FSK communications system to time and frequency-selective fading phenomena. Binary error rate was measured on ANFGC-29 teletype terminal equipment over an HF path from Fort Monmouth, New Jersey to Palo Alto, California in the fall of 1964. Simultaneous measurements were made of channel signal-to-noise ratios, channel time-delay profiles, channel Doppler-shift profiles, and signal correlation between spaced antennas. Instrumentation included a phase-stable transmitter-receiver, an oblique-incidence ionospheric sounder, and a special correlation meter. The measured error rates were compared to those predicted by a mathematical model. The model for the channel considers randomly time-varying and frequency-selective effects appropriate for the HF propagation mechanism. The system model approximates the ANFGC-29 system. Theoretical and measured error-rate curves are presented and discussed. Measured system performance showed a well-defined sensitivity to channel time- and frequency-selective effects. The asymptotic error rates measured at high signal-to-noise ratios are in reasonable agreement with those predicted from the model.

Subject Categories:

  • Radiofrequency Wave Propagation
  • Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE