Computer simulation of frequency-selective fading of HF radio signals and of the improvement afforded by mode-averaging receiving techniques
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COMPUTER SIMULATION PROGRAMS
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angles of arrival ANTENNA 1 OUTPUT antenna spacing ANTNANA approximately Attn block diagram Calif center frequency CHANGE IN FREQUENCY computer program computer simulation Computer-simulated output waveforms Corp DIAGRAM OF ANTENNA Director diversity reception electron density distribution Engrg Dept experimental MADC frequency f frequency response frequency-selective fading Hanscom Field kHz BANDWIDTH kHz passband magnitude mode-averaging action mode-averaging diversity combiner mode-averaging process mode-averaging scheme MADC modes of propagation modulation index N-h profiles null spacings Officer U.S. ONR Branch Office P.O. Box passband phase angle phase time delays range raytracing reference frequency relative signal strengths Rept Research resultant voltage phasor selective fading shown in Fig simulation of frequency-selective single receiver south antennas Stanford Electronics Laboratories T. A. Croft Tech theoretical three mode-averaging schemes U.S. Army U.S. Naval vector sum vertical VOLTAGE PHASOR DIAGRAM Washington waveform for antenna waveforms from programs wavelengths Wright-Patterson AFB