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Sökning: WFRF:(Matuz Balázs)

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1.
  • Ben Yacoub, Emna, et al. (författare)
  • Quaternary Message Passing Decoding of LDPC Codes: Stability Analysis and Error Floor
  • 2021
  • Ingår i: 2021 11th International Symposium on Topics in Coding, ISTC 2021. - 9781665409438
  • Konferensbidrag (refereegranskat)abstract
    • We revisit a coarsely quantized message passing decoding algorithm for low-density parity-check (LDPC) code ensembles, named quaternary message passing (QMP). Particularly, we analyze the performance of unstructured LDPC codes under QMP decoding by means of density evolution. The impact of degree-2 and degree-3 variable nodes on the error floor performance is also discussed. We design a code for QMP that performs within 0.55 dB of the 5G LDPC code at a block error rate of 10−4 .
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2.
  • Steiner, Fabian Roland, et al. (författare)
  • One and Two Bit Message Passing for SC-LDPC Codes with Higher-Order Modulation
  • 2019
  • Ingår i: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 37:23, s. 5914-5925
  • Tidskriftsartikel (refereegranskat)abstract
    • Low complexity decoding algorithms are necessary to meet data rate requirements in excess of 1 Tbps. In this paper, we study one and two bit message passing algorithms for belief propagation decoding of low-density parity-check (LDPC) codes and analyze them by density evolution. The variable nodes exploit soft information from the channel output, and to decrease the data flow, the messages exchanged between check and variable nodes are represented by one or two bits. The newly proposed quaternary message passing (QMP) algorithm is compared asymptotically and in finite length simulations to binary message passing (BMP) and ternary message passing (TMP) for spectrally efficient communication with higher-order modulation and probabilistic amplitude shaping (PAS). To showcase the potential for high throughput forward error correction, spatially coupled LDPC codes and a target spectral efficiency of 3 bits/QAM symbol are considered. Gains of about 0.7 dB and 0.1 dB are observed compared to BMP and TMP, respectively. The gap to unquantized belief propagation decoding is reduced to about 0.75 dB. For smaller code rates, the gain of QMP compared to TMP is more pronounced and amounts to 0.24 dB in the considered example.
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  • Resultat 1-2 av 2
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konferensbidrag (1)
tidskriftsartikel (1)
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refereegranskat (2)
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Graell i Amat, Alexa ... (2)
Ben Yacoub, Emna (2)
Matuz, Balázs (2)
Liva, Gianluigi (1)
Liva, Gianluigi, 197 ... (1)
Steiner, Fabian Rola ... (1)
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Chalmers tekniska högskola (2)
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