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An LDPC decoding algorithm utilizing early decisions
Linköping University, The Institute of Technology. Linköping University, Department of Electrical Engineering, Electronics System.
Linköping University, Department of Electrical Engineering.ORCID iD: 0000-0003-3470-3911
Linköping University, The Institute of Technology. Linköping University, Department of Electrical Engineering, Electronics System.
2005 (English)In: National Conference of Radio Science RVK,2005, 2005Conference paper, Published paper (Refereed)
Abstract [en]

We investigate a modification to the sum-product algorithm used for decoding low-density parity-check (LDPC) codes. The sum-product algorithm is algorithmically simple and highly parallelizable, but suffers from high memory usage, making LDPC codes unsuitable for usage in battery powered devices such as cell phones and PDAs. The proposed modification defines a measure of bit reliabilities during the decoding process. Whenever the reliability of a bit is over a certain threshold, the bit is declared decided, and its messages are no longer calculated. We give experimental results for white Gaussian channels, and show that the amount of memory accesses can be substantially reduced, while performance does not suffer significantly. At a bit error rate of 10^-4, the number of memory accesses is halved, while the required transmitter power increases about 0.3 dB.

Place, publisher, year, edition, pages
2005.
Keyword [en]
Error-correcting codes
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-34450Local ID: 21482OAI: oai:DiVA.org:liu-34450DiVA: diva2:255298
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2015-03-11

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Blad, AntonGustafsson, OscarWanhammar, Lars

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