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Efficient Partial Parallel Encoders for IRA Codes in DVB-S2  

Hwang, Sung-Oh (삼성전자 DMC 연구소 Multimedia 표준 그룹)
Lee, Jai-Yong (연세대학교 전기전자공학과 Ubinet LAB)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.35, no.11C, 2010 , pp. 901-906 More about this Journal
Abstract
Low density parity check (LDPC) code, first introduced by Gallager and re-discovered by MacKay et al, has attracted researcher's interest mainly due to their performance and low decoding complexity. It was remarkable that the performance is very close to Shannon capacity limit under the assumption of having long codeword length and iterative decoder. However, comparing to turbo codes widely used in the current mobile communication, the encoding complexity of LDPC codes has been regarded as the drawback. This paper proposes a solution for DVB-S2 LDPC encoder to reduce the encoder latency. We use the fast IRA encoder that use the transformation of the parity check matrix into block-wise form and the partial parallel process to reduce the number of system clocks for the IRA code encoding. We compare the proposed encoder with the current DVB-S2 encoder to show that the performance of proposal is better than that of the current DVB-S2 encoder.
Keywords
LDPC; IRA; Accumulator; Partial Encoding; Parallel Encoding; DVB-S2;
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