ARA type protograph codes

US7343539B2 · kind B2 · utility

Assignee

• The United States of America as represented by the United States National Aeronautics and Space Administration · US

Inventors

• Dariush Divsalar · Santa Monica, US
• Aliazam Abbasfar · San Diego, US
• Christopher R. Jones · Santa Monica, US
• Samuel J. Dolinar · Burbank, US
• Jeremy Thorpe · Palo Alto, US
• Kenneth S. Andrews · Pasadena, US
• Kung Yao · West Hollywood, US

Key dates

• Filing date: Jun 24, 2005
• Grant date: Mar 11, 2008
• Expiry date: Aug 29, 2026

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03M13/1194
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

An apparatus and method for encoding low-density parity check codes. Together with a repeater, an interleaver and an accumulator, the apparatus comprises a precoder, thus forming accumulate-repeat-accumulate (ARA codes). Protographs representing various types of ARA codes, including AR3A, AR4A and ARJA codes, are described. High performance is obtained when compared to the performance of current repeat-accumulate (RA) or irregular-repeat-accumulate (IRA) codes.