DVB-S2 LDPC Decoding Using Robust Check Node Update Approximations

Broadband satellite services to fixed terminals are currently offered in the forward link by the 2nd generation (2G) digital video broadcasting satellite (DVB-S2) standard. For this standard the use of powerful low-density parity-check (LDPC) error correcting codes has been adopted performing within...

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Bibliographic Details
Published in:IEEE transactions on broadcasting 2008-03, Vol.54 (1), p.120-126
Main Authors: Papaharalabos, S., Papaleo, M., Mathiopoulos, P.T., Neri, M., Vanelli-Coralli, A., Corazza, G.E.
Format: Article
Language:English
Subjects:
Algorithms
Applied sciences
Approximation
Approximation methods
Broadcasting
Broadcasting. Videocommunications. Audiovisual
Code standards
Coding
Coding, codes
Computation
Computational complexity
Decoding
Degradation
Digital video broadcasting
Error correction codes
Exact sciences and technology
Information, signal and communications theory
iterative decoding
Low-Density Parity-Check (LDPC) codes
Modulation
Modulation, demodulation
Noise levels
Parity check codes
Robustness
Satellite broadcasting
Signal and communications theory
Studies
Telecommunications
Telecommunications and information theory
Television
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Summary:Broadband satellite services to fixed terminals are currently offered in the forward link by the 2nd generation (2G) digital video broadcasting satellite (DVB-S2) standard. For this standard the use of powerful low-density parity-check (LDPC) error correcting codes has been adopted performing within approximately 1 dB from the Shannon capacity limit. This paper studies and compares for the first time in a systematic manner different approximation methods used in check node update computation of DVB-S2 LDPC decoding with the aim of reducing computational complexity. Various performance evaluation results are presented for a wide range of DVB-S2 parameters, such as LDPC codeword size, coding rate, modulation format and including several decoding algorithms. It is shown that the proposed check node update approximations have a robust behavior, i.e. the resulting performance is quite independent of the DVB-S2 modulation and coding parameters. It is further shown that these approximations perform very close to the optimal sum-product algorithm (SPA) in degradation, which is less than 0.2 dB. Despite this small degradation, the reduction in computational complexity compared to the optimal SPA is significant and can be as high as 40% in computational time savings.
ISSN:0018-9316
1557-9611
DOI:10.1109/TBC.2007.911365