The Design of Rate-Compatible LDPC Codes for IR-HARQ Systems over Erasure Channels
| Autor: | Dejan Vukobratovic, Lina Stankovic, Dragan Rastovac, Vladimir Stankovic |
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| Rok vydání: | 2010 |
| Předmět: |
Theoretical computer science
Computer science Error floor Concatenated error correction code Automatic repeat request Hybrid automatic repeat request Data_CODINGANDINFORMATIONTHEORY Serial concatenated convolutional codes symbols.namesake Additive white Gaussian noise Computer engineering Bit error rate Redundancy (engineering) symbols Turbo code Erasure Tornado code Forward error correction Low-density parity-check code Decoding methods Communication channel |
| Zdroj: | ICC |
| Popis: | Application-layer forward error correcting (AL-FEC) codes, providing error protection across blocks of packetized data, are becoming increasingly important in emerging networking applications. In this paper, we investigate AL-FEC solutions based on rate- compatible low-density parity-check (RC LDPC) codes, as they may offer excellent performance with low system complexity. Recent studies on RC LDPC codes are focused on physical layer incremental redundancy hybrid automatic-repeat-request (IR-HARQ) systems and typical wireless channel models. The focus of our study is RC LDPC code design as an AL-FEC solution in packet-level IR-HARQ systems assuming erasure channels between the source and the destination(s). We propose novel design methods for RC LDPC codes over erasure channels motivated by the dependance of finite-length LDPC code performance on the size of the smallest stopping set of its code graph. Simulation experiments demonstrate that the proposed RC LDPC design significantly outperforms the state-of-the-art RC LDPC codes in the error-floor region, and in particular, in the domain of poor channel conditions. |
| Databáze: | OpenAIRE |
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