Optical Pulse Coding for Maximum Data Rate.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 19, 1996
- Accession Number
- ADA313838
Entities
People
- Terence W. Barrett