Low-Density Parity-Check Codes - Paperback

by Robert G. Gallager (Author)

This is a complete presentation of all important theoretical and experimental work done on low-density codes. Low-density coding is one of the three techniques thus far developed for efficient communication over noisy channels with an arbitrarily low probability of error. A principal result of information theory is that if properly coded information is transmitted over a noisy channel at a rate below channel capacity, the probability of error can be made to approach zero exponentially with the code length. Any practical use of this theorem, however, requires a coding scheme in which the cost of storage and computation equipment grows slowly with code length. The present book analyzes a class of coding schemes for which costs grow approximately linearly with code length. It demonstrates that error probability approaches zero exponentially with a root of the block length and cites experimental evidence that this coding scheme has profitable aplicability in many communications situations.

Author Biography

Claudia Barnett is Associate Professor of English at Middle Tennessee State University.Her writing has appeared in Modern Drama and Theatre Journal and in the recent anthologySouthern Women Playwrights: New Essays in Literary History and Criticism(University of Alabama Press, 2002). She is currently spending a sabbatical studyingthe manuscripts of Adrienne Kennedy at the Harry Ransom Humanities Research Centerat the University of Texas at Austin.