AN EXAMINATION OF SELECTED HF PHASE MODULATION TECHNIQUES
Abstract
This report develops a probability-of-binary-error expression for a basic binary-adaptive-phase-shift-keyed (BAPSK) system. The error-rate expression uses a mathematical BAPSK system model and a mathematical propagation-medium model. After the probability-of-error expression for a basic BAPSK system has been developed, this expression is modified to include various BAPSK modifications (time guard band, diversity, delay compensation, and others) . The propagation-medium model used in the error-rate expression, which specifically models the high-frequency (HF) propagation medium, is discussed and related to the HF propagation medium. The propagation-medium model includes additive noise, and thus it models the additive as well as the dispersive corruption of the HF propagation medium. Because the error-rate expression developed is relatively simple, the probability of error for a basic BAPSK system is plotted as a function of the signal-to-noise (S/N) for many types of dispersive channels. The most significant feature of the error-rate curves is that the probability of error approaches an asymptotic nonzero value for high S/ N. This asymptotic value is determined by the time-delay and frequency-shift structure of the propagation medium. By using this asymptotic value of the probability of error, the sensitivity of the basic BAPSK system's error rate to time delays and frequency shifts is analyzed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1965
- Accession Number
- AD0487250
Entities
People
- N. T. Gaarder
Organizations
- SRI International