Accession Number : ADA313838

Title :   Optical Pulse Coding for Maximum Data Rate.

Descriptive Note : Final technical rept. Jul 95-Jun 96,

Corporate Author : BSEI VIENNA VA

Personal Author(s) : Barrett, Terence W.

PDF Url : ADA313838

Report Date : 19 JUN 1996

Pagination or Media Count : 134

Abstract : This study shows the benefit of a two-stage hierarchy of codes for maximum data rate transmission. At the first stage, orthogonal codes define the microchannel or user, identified by a first (temporal) matched filter. Once a code is identified by this filter, a second (temporal) matched filter identifies the pulse-position-modulated data with error correction, hence error-correcting codes are required for the second stage. Congruence codes are recommended for orthogonal codes (hyperbolic, quadratic, cubic and quartic) and Lexicographic codes for error correction codes. Besides a hierarchical backbone topology, a multidimensional coding scheme intermixing CMDA, TDMA and WDM provides signal spreading techniques, but they are spread time techniques, as opposed to spread spectrum techniques. A major part of this study addressed the impact of symmetry principles on code design to achieve optimum properties. This study provides many examples of heretofore unknown symmetries underlying code design. Future work will address the use of symmetry in designing optimum codes.

Descriptors :   *ALGORITHMS, *OPTICAL COMMUNICATIONS, *OPTICAL PROCESSING, *ERROR CORRECTION CODES, SIGNAL PROCESSING, OPTIMIZATION, SYSTEMS ENGINEERING, DATA MANAGEMENT, DISTRIBUTED DATA PROCESSING, COMPUTER COMMUNICATIONS, COMPUTER PROGRAMMING, AUTOCORRELATION, INPUT OUTPUT PROCESSING, OPTICAL DATA, ERROR ANALYSIS, SYSTEMS ANALYSIS, DATA RATE, FREQUENCY DIVISION MULTIPLEXING, OPTICAL SWITCHING, DATA LINKS, MATCHED FILTERS, CROSS CORRELATION, SPREAD SPECTRUM, PULSE CODE MODULATION, PULSE POSITION MODULATION.

Subject Categories : Electrooptical and Optoelectronic Devices
      Computer Programming and Software
      Computer Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE