# Accession Number:

## AD0722080

# Title:

## Codes, Packings and the Critical Problem.

# Descriptive Note:

## Rept. for Feb 69-Jun 70,

# Corporate Author:

## NORTH CAROLINA UNIV CHAPEL HILL DEPT OF STATISTICS

# Personal Author(s):

# Report Date:

## 1971-02-01

# Pagination or Media Count:

## 23.0

# Abstract:

The report discusses a new approach to a central problem of coding theory. For a given block length and minimum distance constraint, the information rate of a linear code over a finite field is maximized when the code subspace has maximum dimension. The problem of determining this maximum dimension, called the coding problem here, can be viewed as a critical problem in combinatorial geometry. As such, its solution depends only on the lattice of subspaces of a certain subgeometry of projective geometry. From knowledge of the characteristic polynomial of this lattice one can immediately determine the maximum dimension of a linear code. The central problem, which is only briefly discussed here, is to determine this polynomial. The well-known connection of the coding problem with the packing problem of projective geometry enables one to approach the packing problem by these methods as well. Author

# Descriptors:

# Subject Categories:

- Cybernetics