Accession Number:

AD0269891

Title:

ON THE DESIGN OF A HIGHLY RELIABLE HF DIGITAL COMMUNICATION SYSTEM. PROBLEMS, DESIGN PROCEDURES AND THE DESCRIPTION OF A PROPOSED DESIGN

Descriptive Note:

Corporate Author:

NATIONAL CASH REGISTER CO DAYTON OHIO

Personal Author(s):

Report Date:

1961-10-01

Pagination or Media Count:

1.0

Abstract:

For the optimum design of a digital HF system using pulse redundancy, it was concluded that statistical information on the correlation between disturbances must be known. This information is not available. From other informationAND BY ANALOGY, IMPORTANT DESIGN CHARACTERISTICS AND REQUIREMENTS FOR AN OPTIMUM DESIGN CAN BE QUALITATIVELY EXTRAPOLATED 1 Wide bandwidth greater than 3 kc to permit effective utilization of frequency diversity, 2 Interleaving of sub-bits from various information-bits to permit effective utilization of time diversity, 3 Use of short-duration pulses followed by long dead periods to provide high potential protection against multipath disto tion by selfinterference, and 4 Use of a demodulatio technique which utilizes, rather than rejects, multipath signal contributions. However, it was also concluded that it is entirely feasible to design and build a 3 kc bandwidth system which will offer substantial performance advantages over an FSK frequency shift keying system. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE