Variable-Weight Block Dual-Diagonal Structure for Low-Rate QC LDPC Codes with Low Error Floors
- Title
- Variable-Weight Block Dual-Diagonal Structure for Low-Rate QC LDPC Codes with Low Error Floors
- Author
- 신동준
- Keywords
- Block dual-diagonal (BDD) structure; circulant matrices; efficient encoding; error floor; girth; minimum Hamming distance; protograph; quasi-cyclic (QC) low-density parity-check (LDPC) codes
- Issue Date
- 2020-03
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Citation
- IEEE TRANSACTIONS ON COMMUNICATIONS, v. 68, no. 3, page. 1344-1357
- Abstract
- Irregular quasi-cyclic (QC) low-density parity-check (LDPC) codes with the block dual-diagonal (BDD) parity structure are widely adopted in many communication standards because the BDD structure supports an efficient encoding and many degree-2 variable nodes inside are adequate for the construction of mid- to high-rate codes. However, we observe that low-rate irregular QC LDPC codes with the BDD parity structure inherently contain too many degree-2 variable nodes and suffer from error floors in high signal-to-noise ratio (SNR) region. In this paper, a generalized BDD structure including double-weight circulants as well as circulant permutation matrices is proposed for low-rate irregular QC LDPC codes with low error floors which is achieved with a little bit giving up error performance in the waterfall region. When constructing the parity part of a code with the generalized BDD structure, the portion of double-weight circulants is variable so that the resulting LDPC code can achieve a desired degree distribution including degrees 2 and 3 while supporting the efficient encoding. We show that low-rate QC LDPC codes constructed with the proposed BDD structure have better theoretical properties and lower error floor than those with the conventional BDD structure.
- URI
- https://ieeexplore.ieee.org/document/8922716https://repository.hanyang.ac.kr/handle/20.500.11754/164939
- ISSN
- 0090-6778; 1558-0857
- DOI
- 10.1109/TCOMM.2019.2957474
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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