NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Maximum likelihood decoding analysis of Accumulate-Repeat-Accumulate CodesRepeat-Accumulate (RA) codes are the simplest turbo-like codes that achieve good performance. However, they cannot compete with Turbo codes or low-density parity check codes (LDPC) as far as performance is concerned. The Accumulate Repeat Accumulate (ARA) codes, as a subclass of LDPC codes, are obtained by adding a pre-coder in front of RA codes with puncturing where an accumulator is chosen as a precoder. These codes not only are very simple, but also achieve excellent performance with iterative decoding. In this paper, the performance of these codes with (ML) decoding are analyzed and compared to random codes by very tight bounds. The weight distribution of some simple ARA codes is obtained, and through existing tightest bounds we have shown the ML SNR threshold of ARA codes approaches very closely to the performance of random codes. We have shown that the use of precoder improves the SNR threshold but interleaving gain remains unchanged with respect to RA code with puncturing.
Document ID
20060046315
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
Authors
Abbasfar, Aliazam
Divsalar, Dariush
Yao, Kung
Date Acquired
August 23, 2013
Publication Date
November 29, 2004
Subject Category
Communications And Radar
Meeting Information
Meeting: IEEE Global Telecommunications Conference
Location: Dallas, TX
Country: United States
Start Date: November 29, 2004
End Date: December 3, 2004
Distribution Limits
Public
Copyright
Other
Keywords
low density parity codes (LDPC)
weight distribution
upper bounds
asymptotic thresholds

Available Downloads

There are no available downloads for this record.
No Preview Available