Codes, systems, and graphical models

Includes bibliographical references

1. Overviews.- An introduction to the analysis of iterative coding systems.- Connections between linear systems and convolutional codes.- Multi-dimensional symbolic dynamical systems.- 2. Codes on Graphs.- Linear-congruence constructions of low-density parity-check codes.- On the effective weights of pseudocodewords for codes defined on graphs with cycles.- Evaluation of Gallager codes for short block length and high rate applications.- Two small Gallager codes.- Mildly non-linear codes.- Capacity-achieving sequences.- Hypertrellis: A generalization of trellis and factor graph.- 3: Decoding Techniques.- BSC thresholds for code ensembles based on “typical pairs” decoding.- Properties of the tailbiting BCJR decoder.- Iterative decoding of tail-biting trellises and connections with symbolic dynamics.- Algorithms for decoding and interpolation.- An algebraic description of iterative decoding schemes.- Recursive construction of Gröbner bases for the solution of polynomial congruences.- On iterative decoding of cycle codes of graphs.- 4. Convolutional Codes and Codes Over Rings.- Convolutional codes over finite Abelian groups: Some basic results.- Symbolic dynamics and convolutional codes.- Linear codes and their duals over artinian rings.- Unit memory convolutional codes with maximum distance.- Basic properties of multidimensional convolutional codes.- 5. Symbolic Dynamics and Automata Theory.- Length distributions and regular sequences.- Handelman’s theorem on polynomials with positive multiples.- Topological dynamics of cellular automata.- A spanning tree invariant for Markov shifts.- List of workshop participants.

A major new theme in this area of research is that of codes and systems based on graphical models.This volume contains survey and research articles from leading researchers at the interface of these subjects.