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Comparison of LDPC Block and LDPC Convolutional Codes based on their Decoding Latency

We compare LDPC block and LDPC convolutional codes with respect to their decoding performance under low decoding latencies. Protograph based regular LDPC codes are considered with rather small lifting factors. LDPC block and convolutional codes are decoded using belief propagation. For LDPC convolutional codes, a sliding window decoder with different window sizes is applied to continuously decode the input symbols. We show the required Eb/N0 to achieve a bit error rate of 10 -5 for the LDPC block and LDPC convolutional codes for the decoding latency of up to approximately 550 information bits. It has been observed that LDPC convolutional codes perform better than the block codes from which they are derived even at low latency. We demonstrate the trade off between complexity and performance in terms of lifting factor and window size for a fixed value of latency. Furthermore, the two codes are also compared in terms of their complexity as a function of Eb/N0. Convolutional codes with Viterbi decoding are also compared with the two above mentioned codes.

Identiferoai:union.ndltd.org:DRESDEN/oai:qucosa.de:bsz:14-qucosa-101450
Date11 February 2013
CreatorsHassan, Najeeb ul, Lentmaier, Michael, Fettweis, Gerhard P.
ContributorsTechnische Universität Dresden, Sonderforschungsbereich 912
PublisherSaechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden
Source SetsHochschulschriftenserver (HSSS) der SLUB Dresden
LanguageEnglish
Detected LanguageEnglish
Typedoc-type:conferenceObject
Formatapplication/pdf
Source7th International Symposium on Turbo Codes and Iterative Information Processing (ISTC), 27-31 Aug. 2012, Gothenburg, Sweden, 2012, S.225-229, ISBN: 978-1-4577-2114-4, ISSN: 2165-4700

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