Line-of-Sight Wideband Propagation.
Abstract
REPORT DOCUMENTS WORK CARRIED OUT IN THREE INTERRELATED TECHNICAL AREAS: STUDY OF CHANNEL MEASUREMENT TECHNIQUES, MODELING THE MULTIPATH STRUCTURE OF LINE-OF-SIGHT TROPOSPHERIC PATHS, AND PREDICTION OF SPREAD SPECTRUM MODEM PERFORMANCE AS A FUNCTION OF MULTIPATH CONDITIONS. As a result of the study it was found that a pseudo-random prober and a multiplexed correlator provide the most cost-effective means of gathering the desired channel parameter information. Modeling of the multipath structure of RCV links was concentrated on the phenomena of atmospheric layers having steep refractive index gradients. Multipath structures were found having from 2 to 4 paths with path delays varying from less than a nanosecond to tens of nanoseconds, with the two-path structure being most common. Error performance curves were obtained for a representative pseudo-noise carrier data modem for a fixed amplitude, random-phase, two-path structure as a function of relative path strength and path delay. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1973
- Accession Number
- AD0755922
Entities
People
- Charles J. Boardman
- Joseph K. Derosa
- Phillip A. Bello