Structured IRA Codes: Performance Analysis and Construction

In this letter, we present design techniques for structured irregular repeat-accumulate (S-IRA) codes with low error-rate floors. These S-IRA codes need not be quasi-cyclic, permitting flexibility in code dimension, length, and rate. We present a simple ensemble estimate of the level of the error-ra...

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Bibliographic Details
Published in:IEEE transactions on communications 2007-05, Vol.55 (5), p.837-844
Main Authors: Yifei Zhang, Ryan, W.E.
Format: Article
Language:English
Subjects:
Additive white noise
Algorithm design and analysis
Algorithms
Applied sciences
Channels
Coding, codes
Communications Society
Decoding
Design engineering
Encoders
Estimates
Exact sciences and technology
Flexibility
Floors
Gaussian
Information, signal and communications theory
Low floor
NASA
Parity check codes
Performance analysis
Signal and communications theory
Telecommunications and information theory
Transfer functions
Yield estimation
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Summary:In this letter, we present design techniques for structured irregular repeat-accumulate (S-IRA) codes with low error-rate floors. These S-IRA codes need not be quasi-cyclic, permitting flexibility in code dimension, length, and rate. We present a simple ensemble estimate of the level of the error-rate floor of finite-length IRA codes on the additive white Gaussian noise channel. This performance estimate provides guidance on the choice of IRA code column weights which yield low floors. We also present two design algorithms for S-IRA codes accompanied by software- and hardware-based performance results which demonstrate their low floors. Lastly, we present two design algorithms for multirate S-IRA code families implementable by a single encoder/decoder
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2007.896139