Accession Number : AD0861903
Title : Error Rate Observed on HF Multichannel Fleet Broadcast System.
Descriptive Note : Research and Development rept. Oct 68-Jan 69,
Corporate Author : NAVAL ELECTRONICS LAB CENTER SAN DIEGO CA
Personal Author(s) : Johnson, G. B. ; Francis, G. P.
Report Date : 28 JUL 1969
Pagination or Media Count : 17
Abstract : Data samples of the error-rate performance of the hf multichannel Fleet broadcast system under shipboard environment and normal-to-worst-case noise conditions were taken en route to Puerto Rico and while in the Caribbean area. Under normal noise conditions, median bit-error rates were about 0.012 for single channel, 0.0055 for dual-inband diversity, and 0.001 for quad diversity. For worst-case conditions, the rates were about 0.01 for single channel, 0.003 for dual-inband diversity, and 0.001 for polarization-quad diversity. Under both conditions of environment and noise, polarization-quad diversity provided large BER improvement factors over dual diversity and single channel. System performance was better when frequencies were selected on the basis of relative BER rather than on predicted muf or S/N ratio. (Author)
Descriptors : (*COMMUNICATION AND RADIO SYSTEMS, NAVAL OPERATIONS), HIGH FREQUENCY, ERRORS, NUMERICAL ANALYSIS, RADIO TRANSMISSION, RADIO INTERFERENCE.
Subject Categories : Radio Communications
Distribution Statement : APPROVED FOR PUBLIC RELEASE