Accession Number : AD0757553

Title :   Digital Troposcatter Experiments.

Descriptive Note : Final rept. Mar 71-Jul 72,

Corporate Author : SIGNATRON INC LEXINGTON MASS

Personal Author(s) : Ehrman,Leonard ; Graham,James W.

Report Date : JAN 1973

Pagination or Media Count : 169

Abstract : RORS, ATTENUATION, MODULATION, SYNCHRONIZATION(ELECTRONICS), INFORMATION THEORY, NEW YORK*TROPOSPHERIC SCATTER COMMUNICATIONExtensive measurements and predictions were made at 900 MHz to characterize the loss and multipath variations over the 168 mile Youngstown NY to Verona NY troposcatter link. Cumulative distributions of loss and multipath spread are in good agreement with predictions. Dual space and frequency diversity multipath analyses demonstrate that diversity receivers can use common timing provided the mean delays between paths are equalized. Time synchronization improvements made to a time-gated 3 Mbps coherent modem demonstrate that bit sync can be maintained reliably at signal levels well below those levels required for acceptable error rate and demultiplexer performance. (Author Modified Abstract)

Descriptors :   (*MICROWAVE COMMUNICATIONS, *MULTIPATH TRANSMISSION), DIGITAL SYSTEMS, BROADBAND, ERRORS, ATTENUATION, MODULATION, SYNCHRONIZATION(ELECTRONICS), INFORMATION THEORY, NEW YORK

Subject Categories : Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE