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Experimental demonstration of blind equalization for OFDM/OQAM-VLC system

机译：OFDM / OQAM-VLC系统盲均衡的实验演示

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摘要

Orthogonal frequency-division multiplexing/offset quadrature amplitude modulation (OFDM/OQAM) in direct-detection system obtains many benefits such as free of cyclic prefix (CP) and high side-lobe suppression ratio in comparison with CP-OFDM signal. Unfortunately, for OFDM/OQAM signal, it needs an extra interference cancellation process to eliminate the imaginary intrinsic interference (IMI) when using one-tap frequency equalization known as interference approximation method (IAM). Blind equalization without a pilot overhead for OFDM/OQAM signal is proposed and experimentally demonstrated in visible light communication (VLC) system with limited modulation bandwidth. Experimental results show that blind equalization for OFDM/OQAM-VLC can effectively eliminate the IMI effect and can exhibit better symbol error rate on different subcarriers. Furthermore, compared with conventional IAM, it exhibits 3.2 and 2.7 dB overall improvement in Q~2-factor using blind equalization based on the constant modulus algorithm and constant norm algorithm, respectively. In addition, the system can achieve a total data rate of 3.96 Gb/s over 5-m free space link with a bit error rate lower than hard-decision forward error correction limit of 3.8 × 10~3.
机译：与CP-OFDM信号相比，直接检测系统中的正交频分复用/偏移正交调制（OFDM / OQAM）获得许多益处，例如自由循环前缀（CP）和高侧瓣抑制比。遗憾的是，对于OFDM / OQAM信号，它需要额外的干扰消除过程，以消除当使用称为干扰近似方法（IAM）的单次抽头频率均衡时的虚构内在干扰（IMI）。在没有用于OFDM / OQAM信号的情况下，在具有有限调制带宽的可见光通信（VLC）系统中，提出了对OFDM / OQAM信号的导频开销的盲均衡。实验结果表明，OFDM / OQAM-VLC的盲均衡可以有效地消除IMI效果，并且可以在不同的子载波上表现出更好的符号错误率。此外，与常规IAM相比，它在恒定模数算法和恒定规范算法的盲均衡分别表现出3.2和2.7dB的总体改善Q〜2因素。此外，系统可以实现3.96 GB / s的总数据速率超过5米的可用空间链路，比特误差率低于硬度决策误差校正限值为3.8×10〜3。

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  • 来源
    《Optical engineering》 |2019年第6期|066106.1-066106.7|共7页
  • 作者

    Jin Shi; Jing He; Rui Zhang; Rui Deng;

  • 作者单位

    Hunan University College of Computer Science and Electronic Engineering Key Laboratory for Micro-/Nano Opto-Electronic Device of the Ministry of Education of China Changsha China;

    Hunan University College of Computer Science and Electronic Engineering Key Laboratory for Micro-/Nano Opto-Electronic Device of the Ministry of Education of China Changsha China;

    Hunan University College of Computer Science and Electronic Engineering Key Laboratory for Micro-/Nano Opto-Electronic Device of the Ministry of Education of China Changsha China;

    Hunan University College of Computer Science and Electronic Engineering Key Laboratory for Micro-/Nano Opto-Electronic Device of the Ministry of Education of China Changsha 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

    visible light communication; orthogonal frequency-division multiplexing/offset quadrature amplitude modulation; blind equalization;

    机译：可见光通信;正交频分复用/偏移正交幅度调制;盲均衡;

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