THE FRAMING PROBLEM IN BLOCK CODED FEEDBACK COMMUNICATIONS SYSTEMS.
Abstract
The literature on word synchronization and framing of block coded binary transmission systems is reviewed in depth, with specific references to an extensive bibliography. Particular attention is paid to the use of comma-free codes derived from linear codes without added redundancy in such a way that the error control properties of the codes are fully retained. The review is directed towards the use of these techniques in a two way system with feedback, and includes a discussion of the special considerations which arise in this application. It is shown that all these techniques involve a substantial loss of ultimate information rate, and/or a substantial increase in system complexity over that required for error control alone. A modification of the comma-free codes is suggested in which iterated codes are employed to provide a sync grating intermediate between digit and word sync. This is shown to avoid much of the added complexity of comma-free codes, but at an additional cost in information rate. The report concludes with a brief discussion of still another technique which as yet has received too little attention. With this approach one does not seek absolute sync protection in the absence of channel errors, rather, one seeks highly reliable sync protection with the statistics of both source and channel taken into account. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 24, 1966
- Accession Number
- AD0666685
Entities
People
- Jerome T. Waters
- Peter M. Dollard
Organizations
- State University of New York