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Efficient Decoding Algorithms for Low-Density Parity-Check Codes
Linköping University, Department of Electrical Engineering.
2005 (English)Independent thesis Basic level (professional degree)Student thesisAlternative title
Effektiva avkodningsalgoritmer för low density parity check-koder (Swedish)
Abstract [en]

Low-density parity-check codes have recently received much attention because of their excellent performance and the availability of a simple iterative decoder. The decoder, however, requires large amounts of memory, which causes problems with memory consumption.

We investigate a new decoding scheme for low density parity check codes to address this problem. The basic idea is to define a reliability measure and a threshold, and stop updating the messages for a bit whenever its reliability is higher than the threshold. We also consider some modifications to this scheme, including a dynamic threshold more suitable for codes with cycles, and a scheme with soft thresholds which allow the possibility of removing a decision which have proved wrong.

By exploiting the bits different rates of convergence we are able to achieve an efficiency of up to 50% at a bit error rate of less than 10^-5. The efficiency should roughly correspond to the power consumption of a hardware implementation of the algorithm.

Place, publisher, year, edition, pages
Institutionen för systemteknik , 2005.
Keyword [en]
Electronics, LDPC, Low Density Parity Check, Tanner graph, decoding, sum-product, probability propagation, early decision, threshold
Keyword [sv]
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:liu:diva-2794ISRN: LITH-ISY-EX--05/3691--SEOAI: diva2:20136
Available from: 2005-03-21 Created: 2005-03-21

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