Accession Number : ADA310824

Title :   Digital Communications Systems: Propagation Effects, Technical Solutions, Systems Design (Systemes de Propagation Numeriques: Effets de la Propagation, solutions Techniques, Conception des Systemes).

Corporate Author : ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRAN CE)

PDF Url : ADA310824

Report Date : APR 1996

Pagination or Media Count : 463

Abstract : Digital communications systems are important elements in military systems because of the security and discretion which they provide in the transmission of information. In addition to the great many advances which have been made in the last decade, this symposium showed that very considerable progress will be achieved in the near future. The studies being carried out on transmission media in all the frequency ranges, from decametric waves (HF waves) to submillimetric waves (EHF waves) enable us to model them better, to simulate them better and then to use them better. The spin-off for transmission systems is immediate. New advances have been made, using more complex signal processing, data encoding and processing procedures, which now appear as the vectors of future progress. The symposium showed that we can expect considerable improvements in the future: (1) in the quality of data transmission by the use of more complex techniques and better matching to transmission channels; (2) in the security and discretion of communications, in particular by the use of more powerful encoding; and, (3) in the adaptivity of systems to transmission channels by the use of new methods, such as the real time evaluation of these channels and the use of new methods such as passive evaluation, which introduces a new argument into the debate about the discretion of communication links. In conclusion, it would appear that digital data links are still in full progress, driven by major technical developments.

Descriptors :   *MILITARY APPLICATIONS, *DIGITAL COMMUNICATIONS, TEST AND EVALUATION, DATA BASES, SIGNAL PROCESSING, NATO, PROPAGATION, HIGH FREQUENCY, SYMPOSIA, DATA TRANSMISSION SYSTEMS, REAL TIME, PASSIVE SYSTEMS, TRANSMITTANCE, CODING, SOLUTIONS(GENERAL), QUALITY, COMMUNICATIONS NETWORKS, FRENCH LANGUAGE, MEDIA, DATA LINKS, MATCHING, CHANNELS, EXTREMELY HIGH FREQUENCY, WAVES.

Subject Categories : Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE