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Investigation of LDPC code in DVB-S2
Linköping University, Department of Electrical Engineering, Computer Engineering. Linköping University, The Institute of Technology.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

As one of the most powerful error-correcting codes, Low-density parity check codes are widely used in digital communications. Because of the performance of LDPC codes are capable to close the shannon limited extraordinarily, LDPC codes are to be used in the new Digital Video Broadcast-Satellite-Second Generation(DVB-S2) and it is the first time that LDPC codes are included in the broadcast standard in 2003.

In this thesis, a restructured parity-check matrices which can be divided into sub-matrices for LDPC code in DVB-S2 is provided. Corresponded to this restructured parity-check matrix, a reconstructed decoding table is invented. The encoding table of DVB-S2 standard only could obtain the unknown check nodes from known variable nodes, while the decoding table this thesis provided could obtain the unknown variable nodes from known check nodes what is exactly the Layered-massage passing algorithm needed. Layered-message passing algorithm which also known as "Turbo-decoding message passing" is used to reduce the decoding iterations and memory storage for messages. The thesis also investigate Bp algorithm, lambda-min algorithm, Min-sum algorithm and SISO-s algorithm, meanwhile, simulation results of these algorithms and schedules are also presented.

Place, publisher, year, edition, pages
2012. , 72 p.
Keyword [en]
LDPC code, DVB-S2, Restructured parity-check matrix, Layered message passing(LMP), Reconstructed decoding table
National Category
URN: urn:nbn:se:liu:diva-75164ISRN: LiTH-ISY-EX--12/4321--SEOAI: diva2:504435
Subject / course
Automatic Control
2012-01-23, 09:15 (English)
Available from: 2012-02-21 Created: 2012-02-19 Last updated: 2012-02-21Bibliographically approved

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