Decoding Scheduling Schemes for UEP QC-LDPC Codes
碩士 === 國立清華大學 === 通訊工程研究所 === 106 === Low-density parity-check (LDPC) codes have been demonstrated to achieve near-capacity performance with iterative message-passing decoding and sufficiently long code length. Therefore, LDPC codes have attracted considerable attention because of their outstanding...
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ndltd-TW-106NTHU56500032019-05-16T00:08:09Z http://ndltd.ncl.edu.tw/handle/tcnxew Decoding Scheduling Schemes for UEP QC-LDPC Codes 非均等錯誤保護類循環低密度偶校碼之解碼排程設計 Wu, Jia-Jyun 吳佳峻 碩士 國立清華大學 通訊工程研究所 106 Low-density parity-check (LDPC) codes have been demonstrated to achieve near-capacity performance with iterative message-passing decoding and sufficiently long code length. Therefore, LDPC codes have attracted considerable attention because of their outstanding performance. Quasi-cyclic LDPC (QC-LDPC) codes with structured parity-check matrices are one type of LDPC codes. The advantages of QC-LDPC codes are efficient encoding/decoding and reduced complexity of very-large-scale integration (VLSI) implementation. Traditional QC-LDPC codes provide equal error protection in the whole codeword; that is, each codeword bit exhibits the same performance regardless of its importance. QC-LDPC codes with unequal error protection (UEP) properties have different error-correcting capabilities for different parts of the codeword bits. The more important bits can have more protection. LDPC decoding is usually executed by using iterative message-passing decoding based on the sum-product algorithm (SPA). However, conventional decoding algorithms were not designed for LDPC codes with UEP properties. In this thesis, we propose three decoding scheduling schemes for UEP QC-LDPC codes based on existing scheduling strategies. Simulation results are presented to verify that the proposed schemes can provide better bit error rate (BER)/block error rate (BLER) performance for a fixed number of iterations for subcodewords that are not on the higher protection levels. Furthermore, the average number of iterations can be reduced, thereby reducing the decoding computation complexity. Chao, Chi-Chao 趙啟超 2017 學位論文 ; thesis 44 en_US |
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碩士 === 國立清華大學 === 通訊工程研究所 === 106 === Low-density parity-check (LDPC) codes have been demonstrated to achieve near-capacity performance with iterative message-passing decoding and sufficiently long code length. Therefore, LDPC codes have attracted considerable attention because of their outstanding performance. Quasi-cyclic LDPC (QC-LDPC) codes with structured parity-check matrices are one type of LDPC codes. The advantages of QC-LDPC codes are efficient encoding/decoding and reduced complexity of very-large-scale integration (VLSI) implementation.
Traditional QC-LDPC codes provide equal error protection in the whole codeword; that is, each codeword bit exhibits the same performance regardless of its importance. QC-LDPC codes with unequal error protection (UEP) properties have different error-correcting capabilities for different parts of the codeword bits. The more important bits can have more protection.
LDPC decoding is usually executed by using iterative message-passing decoding based on the sum-product algorithm (SPA). However, conventional decoding algorithms were not designed for LDPC codes with UEP properties. In this thesis, we propose three decoding scheduling schemes for UEP QC-LDPC codes based on existing scheduling strategies. Simulation results are presented to verify that the proposed schemes can provide better bit error rate (BER)/block error rate (BLER) performance for a fixed number of iterations for subcodewords that are not on the higher protection levels. Furthermore, the average number of iterations can be reduced, thereby reducing the decoding computation complexity.
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author2 |
Chao, Chi-Chao |
author_facet |
Chao, Chi-Chao Wu, Jia-Jyun 吳佳峻 |
author |
Wu, Jia-Jyun 吳佳峻 |
spellingShingle |
Wu, Jia-Jyun 吳佳峻 Decoding Scheduling Schemes for UEP QC-LDPC Codes |
author_sort |
Wu, Jia-Jyun |
title |
Decoding Scheduling Schemes for UEP QC-LDPC Codes |
title_short |
Decoding Scheduling Schemes for UEP QC-LDPC Codes |
title_full |
Decoding Scheduling Schemes for UEP QC-LDPC Codes |
title_fullStr |
Decoding Scheduling Schemes for UEP QC-LDPC Codes |
title_full_unstemmed |
Decoding Scheduling Schemes for UEP QC-LDPC Codes |
title_sort |
decoding scheduling schemes for uep qc-ldpc codes |
publishDate |
2017 |
url |
http://ndltd.ncl.edu.tw/handle/tcnxew |
work_keys_str_mv |
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