Repeat-accumulate code: Difference between revisions

Revision as of 00:23, 5 December 2023

Latest revision as of 17:39, 17 December 2024

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==Irregular repeat accumulate codes==

Irregular repeat accumulate (IRA) codes build on top of the ideas of RA codes. IRA replaces the outer code in RA code with a low density generator matrix code.<ref>{{cite web |firstfirst1=Hui |lastlast1=Jin |first2=Aamod |last2=Khandekar |first3=Robert |last3=McEliece |title=Irregular Repeat-Accumulate Codes |date=2000 |publisher=Department of Electrical Engineering, California Institute of Technology |url=http://www.mceliece.caltech.edu/publications/Brest00.pdf}}</ref> IRA codes first repeats information bits different times, and then accumulates subsets of these repeated bits to generate parity bits. The irregular degree profile on the information nodes, together with the degree profile on the check nodes, can be designed using density evolution.

Systematic IRA codes are considered a form of [[LDPC]] code. Litigation over whether the DVB-S2 LDPC code is a form of IRA code is ongoing.<ref>[http://www.law360.com/articles/622198/hughes-satellite-codes-spark-caltech-patent-suit Hughes Satellite Codes Spark Caltech Patent Suit]</ref> US patents 7,116,710; 7,421,032; 7,916,781; and 8,284,833 are at issue.{{cn|date=August 2021}}

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== References ==

* {{cite conference |firstfirst1=D. |lastlast1=Divsalar |first2=H. |last2=Jin |first3=R.J. |last3=McEliece |title=Coding theorems for ‘turbo'turbo-like’like' codes |book-title=Proceedings of the annual Allerton Conference on Communication control and Computing |date=September 1998 |pages=201–210 |volume=36 |publisher=University Of Illinois |url=https://www.researchgate.net/profile/Dariush-Divsalar/publication/243768674_Coding_Theorems_for_Turbo-Like_Codes/links/53e3cc5c0cf2fb74870dbbc1/Coding-Theorems-for-Turbo-Like-Codes.pdf243768674}}

== External links ==