| Liu Yang （刘洋）,Li Ying,Su Yuping.[J].高技术通讯(英文),2015,21(4):494~499 |
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| Design of bilayer lengthened LDPC codes over expanded graph for relay channels |
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| DOI：10.3772/j.issn.1006-6748.2015.04.017 |
| 中文关键词: |
| 英文关键词: bilayer LDPC codes, relay channel, decode-and-forward, Gaussian approximation，channel capacity |
| 基金项目: |
| Author Name | Affiliation | | Liu Yang （刘洋） | | | Li Ying | | | Su Yuping | |
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| 中文摘要: |
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| 英文摘要: |
| This paper presents a low complexity optimized algorithm for design of bilayer lengthened LDPC (BL-LDPC) code for decode-and-forward relay system. The design is performed over the expanded graph of the BL-LDPC code, which consists of the original bilayer graph and the extra added relay-generated parity check bits. To build up our proposed optimized algorithm, we present a modified Gaussian approximation algorithm for the expanded structure of the BL-LDPC code. Then using the proposed optimized algorithm, we find the optimum overall expanded graph of the BL-LDPC code. Simulation results show that the BL-LDPC codes obtained by our proposed optimized algorithm have excellent bit-error-rate performances and small gaps between the convergence thresholds and the theoretical limits when transmitted over the additive white Gaussian noise channels. |
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