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首页> 外文期刊>Optical fiber technology >Joint adaptive code rate technique and bit interleaver for direct-detection optical OFDM system
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Joint adaptive code rate technique and bit interleaver for direct-detection optical OFDM system

机译：直接检测光学OFDM系统的联合自适应码率技术和比特交织器

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摘要

In this paper, we have theoretically analyzed that the existence of inter-subcarrier mixing interferences (ISMI) and frequency selective fading (FF) in the directed-detection optical orthogonal-frequency-division-multiplexing (DDO-OFDM) system will cause an unbalanced error distribution and degrade the system performance. Then we propose to employ the adaptive code rate technique (ACT) and bit interleaver in the DDO-OFDM system to combat ISMI and FF. The experimental results show that the receiver sensitivity of 5.9-Gb/s 64-ary quadrature-amplitude-modulation (64QAM) OFDM signal employing ACT(9.43 Gb/s after encoding) is improved more than 2 dB compared with the 5.9-Gb/s OFDM signal with 0.66 turbo coding rate (8.85 Gb/s after encoding) at the bit-error ratio (BER) of le-4. When the coding rate is all 0.625, the OFDM signal employing ACT has more than 1-dB gain improvement compared with the OFDM signal encoded with fixed-rate turbo coding. And additional ～1-dB receiver sensitivity improvement is enabled when the OFDM signal employ ACT and bit-interleaver simultaneously.
机译：本文从理论上分析了定向检测光正交频分复用（DDO-OFDM）系统中子载波间混合干扰（ISMI）和频率选择性衰落（FF）的存在将导致不平衡。错误分布并降低系统性能。然后，我们提出在DDO-OFDM系统中采用自适应码率技术（ACT）和比特交织器来对抗ISMI和FF。实验结果表明，采用ACT（编码后为9.43 Gb / s）的5.9 Gb / s 64进制正交幅度调制（64QAM）OFDM信号的接收灵敏度比5.9 Gb / s提高了2 dB以上。在le-4的误码率（BER）下具有0.66 Turbo编码速率（编码后为8.55 Gb / s）的OFDM信号。当编码率全部为0.625时，与使用固定速率Turbo编码进行编码的OFDM信号相比，采用ACT的OFDM信号具有超过1-dB的增益提高。当OFDM信号同时使用ACT和比特交织器时，可以使〜1 dB的接收机灵敏度进一步提高。

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  • 来源
    《Optical fiber technology》 |2013年第1期|35-39|共5页
  • 作者

    Qi Tang; Jianjun Yu; Zizheng Cao; Jiangnan Xiao; Xinying Li; Mango Fall; Lin Chen;

  • 作者单位

    Key laboratory for Micro/Nano Opto-Electronic Devices of Ministry of Education, and School of Information Science and Engineering. Hunan University, Changsha 410082, China;

    Key laboratory for Micro/Nano Opto-Electronic Devices of Ministry of Education, and School of Information Science and Engineering. Hunan University, Changsha 410082, China,Fudan University, Shanghai, China;

    Key laboratory for Micro/Nano Opto-Electronic Devices of Ministry of Education, and School of Information Science and Engineering. Hunan University, Changsha 410082, China;

    Key laboratory for Micro/Nano Opto-Electronic Devices of Ministry of Education, and School of Information Science and Engineering. Hunan University, Changsha 410082, China;

    Fudan University, Shanghai, China;

    Key laboratory for Micro/Nano Opto-Electronic Devices of Ministry of Education, and School of Information Science and Engineering. Hunan University, Changsha 410082, China;

    Key laboratory for Micro/Nano Opto-Electronic Devices of Ministry of Education, and School of Information Science and Engineering. Hunan University, Changsha 410082, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    optical fiber communication; orthogonal frequency division multiplexing; (OFDM); direct detection (DD); adaptive code rate technique (ACT); bit interleaver;

    机译：光纤通讯;正交频分复用（OFDM）;直接检测（DD）;自适应码率技术（ACT）;比特交织器;

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