CUED Publications database

Comparison of constructions of irregular Gallager codes

MacKay, DJC and Wilson, ST and Davey, MC (1999) Comparison of constructions of irregular Gallager codes. IEEE Transactions on Communications, 47. pp. 1449-1454. ISSN 0090-6778

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Abstract

The low-density parity check codes whose performance is closest to the Shannon limit are `Gallager codes' based on irregular graphs. We compare alternative methods for constructing these graphs and present two results. First, we find a `super-Poisson' construction which gives a small improvement in empirical performance over a random construction. Second, whereas Gallager codes normally take N2 time to encode, we investigate constructions of regular and irregular Gallager codes that allow more rapid encoding and have smaller memory requirements in the encoder. We find that these `fast encoding' Gallager codes have equally good performance.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div F > Machine Intelligence
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:51
Last Modified: 08 Dec 2014 02:25
DOI: 10.1109/26.795809