| LDPC码在相干光通信下的性能分析与研究 |
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| 引用本文： | 王斯维,许渤.LDPC码在相干光通信下的性能分析与研究[J].光通信技术,2012,36(4):39-41. |
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| 作者姓名： | 王斯维 许渤 |
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| 作者单位： | 电子科技大学宽带光纤传输与通信网技术教育部重点实验室,成都,611731 |
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| 基金项目： | 国家自然科学基金项目(60602003)资助 |
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| 摘 要： | 对于相干光通信系统,相位噪声成为影响系统性能的重要因素之一,并严重影响LDPC码(低密度奇偶校验码)软译码的性能。仿真结果表明,在16QAM调制方式下,500kHz线宽的激光器相位噪声将导致1.5dB的性能损失。为了降低相位噪声的影响,提出了一种基于相位噪声估计值修正LLR(对数似然比信息)的方法。经仿真验证,该LLR修正方法能够挽回0.5dB的译码性能损失。
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| 关 键 词： | 相干光通信 LDPC码 相位噪声 |
Analysis on the performance of LDPC codes under coherent optical communication |
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| WANG Si-wei
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XU Bo.Analysis on the performance of LDPC codes under coherent optical communication[J].Optical Communication Technology,2012,36(4):39-41. |
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| Authors: | WANG Si-wei XU Bo |
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| Affiliation: | (School of Communication and Information Engineering, University of Electronic Science and Technology of China,Chengdu 611731,China) |
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| Abstract: | For coherent optical fiber communication systems,phase-noise become one of the most factor that degrade decoding performance.The simulation results show that for 16QAM coherent optical communication systems the phase-noise of 500kHz Laser linewidth cause 1.5dB performance lose.To reduce the impact of phase noise,this paper also presents a revised phase-noise estimate based on LLR(log-likelihood ratio information) method.After simulation,the LLR correction decoding method can restore 0.5dB performance loss. |
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| Keywords: | coherent optical communication LDPC code phase noise |
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