Campus Units

Electrical and Computer Engineering, Mathematics

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

7-28-2009

Journal or Book Title

IEEE Journal on Selected Areas in Communications

Volume

27

Issue

6

First Page

889

Last Page

898

DOI

10.1109/JSAC.2009.090807

Abstract

We consider the design and analysis of the efficiently-encodable rate-compatible (E2RC) irregular LDPC codes proposed in previous work. In this work we introduce semi-structured E2RC-like codes and protograph E2RC codes. EXIT chart based methods are developed for the design of semi-structured E2RC-like codes that allow us to determine near-optimal degree distributions for the systematic part of the code while taking into account the structure of the deterministic parity part, thus resolving one of the open issues in the original construction. We develop a fast EXIT function computation method that does not rely on Monte-Carlo simulations and can be used in other scenarios as well. Our approach allows us to jointly optimize code performance across the range of rates under puncturing. We then consider protograph E2RC codes (that have a protograph representation) and propose rules for designing a family of rate-compatible punctured protographs with low thresholds. For both the semi-structured and protograph E2RC families we obtain codes whose gap to capacity is at most 0.3 dB across the range of rates when the maximum variable node degree is twenty.

Comments

This is a manuscript of an article from IEEE Journal on Selected Areas in Communications 27 (2009): 889, doi: 10.1109/JSAC.2009.090807. Posted with permission.

Rights

Copyright 2009 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Copyright Owner

IEEE

Language

en

File Format

application/pdf

Published Version

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