| 背景噪声限下直接检测光PPM编码系统的性能研究 |
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| 引用本文： | 周晓迈,陈文革.背景噪声限下直接检测光PPM编码系统的性能研究[J].电信科学,1994,10(12):28-31. |
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| 作者姓名： | 周晓迈 陈文革 |
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| 作者单位： | 华中理工大学电子与信息工程系 |
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| 摘 要： | 本文研究了背景噪声限下采用编码的直接检测光ＰＰＭ系统的性能，分析了具有不同码率的采用硬判决译码的ＲＳ码，采用最大似然（ＭＬ）译码的卷积码的性能及未编码的ＰＰＭ系统的性能，给出了相应的误比特率和每信息比特信噪比的关系曲线。结果表明：对背景噪声限下的直接检测光ＰＰＭ系统，随着码率的降低，编码不一定能改善系统性能。
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| 关 键 词： | 光通信 PPM 直接检测 信道编码 脉位调制 |
A Study fo Coding for Background-limited Direct-detection Optical PPM Systems |
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| Zhou Xiaomai,Chen Wenge,Xiong Zhaofei,Huang Tiexia.A Study fo Coding for Background-limited Direct-detection Optical PPM Systems[J].Telecommunications Science,1994,10(12):28-31. |
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| Authors: | Zhou Xiaomai Chen Wenge Xiong Zhaofei Huang Tiexia |
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| Abstract: | In this paper we study coding for background-limited direct-detection optical PPM systems.The performances of Reed-Solomon codes using hard-decision decoding and convolutional codes using maxi-mum likelihood decoding(MLD)with different code rates are analysed.Relations between bit error proba-bility P_b and signal-to-noise ratio per information bit(SNR)_b for the uncoded and coded systems are given.It is found that coding dose not necessarily improve the performances of background-limited direct-detectionoptical PPM systems with decreasing code rates. |
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| Keywords: | optical communication PPM direct-detection channel coding |
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