Accession Number : AD0776987

Title :   CODEM I Data Transmission System. Volume I. Theory.

Descriptive Note : Final rept.,


Personal Author(s) : Chase,D. ; Harper,R. C. ; Joffe,A. M. ; Spencer,R. W. ; Zaborowski,J. S. , Jr

Report Date : JUL 1972

Pagination or Media Count : 111

Abstract : CODEM I is a data terminal set which offers the capability of obtaining extremely reliable (error rates below 0.00001) digital data transmission over an HF radio channel at a data rate equal to or greater than previous systems. The basic concept of the CODEM is the integration of error correcting coding and the modem design in such a manner that channel measurement information can be used to enhance the data reliability. CODEM I is capable of operation at 4800 bps using two independent sidebands and 2400 bps in either a dual frequency diversity mode or within a single voice bandwidth channel. In Volume 1 the CODEM concept is explained, theoretical results are obtained, and some computer and field results are presented. (Modified author abstract)

Descriptors :   *Data transmission systems, *Information theory, Coding, Decoding, Multipath transmission, High frequency, Error correction codes, Waveforms, Fading(Electromagnetic waves), Probability, Statistical analysis, Algorithms, Digital systems, Pulse communications

Subject Categories : Cybernetics
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE