FIXED-WORD-DURATION, VARIABLE-DATA-RATE PROCEDURES FOR FEEDBACK COMMUNICATION SYSTEMS.
Abstract
A variable-data-rate procedure employing a fixed word duration is described. The procedure is shown to be compatible with long-code, fail-safe communication. It also permits independent rate variations in the opposing directions of a two-way communication system. By avoiding a weakness which arises when the rates of the two channels are required either to remain fixed or to track each other - namely, that the rate at which information is accepted is controlled by the weaker of the two links - a substantial improvement in overall communication efficiency can be achieved. The advantages of independent rate variation are illustrated. For an assumption of identical but independent Rayleigh-distributed slow fading over the two channels, the independent rate-variation procedure shows a 3:1 advantage in average rate over a fixed, ideal, cumulative decision system and a 2:1 advantage over a variable-data-rate system in which the rate must be the same in both directions. Another model is shown where the advantage is even greater. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1967
- Accession Number
- AD0660126
Entities
People
- John J. Metzner
- Kenneth C. Morgan
Organizations
- New York University