北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2024, Vol. 47 ›› Issue (1): 78-84.

• 论文 • 上一篇    下一篇

增强型索引调制非对称限幅光OFDM系统

王惠琴1,何婕1,曹明华1,彭清斌1,王斌2   

  1. 1. 兰州理工大学
    2. 长庆油田数字和智能化事业部
  • 收稿日期:2022-12-14 修回日期:2023-02-13 出版日期:2024-02-26 发布日期:2024-02-26
  • 通讯作者: 王惠琴 E-mail:whq1222@lut.edu.cn
  • 基金资助:
    国家自然科学基金项目

Asymmetrically Clipped Optical OFDM System with Enhanced Index Modulation

WANG Huiqin1, HE Jie1, CAO Minghua1, PENG Qingbin1, WANG Bin2   

  • Received:2022-12-14 Revised:2023-02-13 Online:2024-02-26 Published:2024-02-26
  • Contact: Hui-Qin WANG E-mail:whq1222@lut.edu.cn

摘要: 针对传统索引调制非对称限幅光正交频分复用(OFDM)传输速率不够理想的问题,利用 2 次选择激活子载波加大激活子载波携带的索引信息,同时在激活子载波上传输不同的调制符号,提出了一种增强型索引调制非对称限幅光 OFDM 系统。同时,利用子载波选择算法来改善系统的误码性能。介绍了所提系统的映射原理,利用联合界技术推导了其理论误码率,并与传统系统进行对比。结果表明,所提系统不仅提高了传输速率,而且其误码性能得到了明显改善。在强湍流、误码率为 1×10-3时, (8,3,3)所提系统的传输速率比(8,6)传统系统提升了 1.25倍,信噪比改善了约 1.4 dB

关键词: 无线光通信, 正交频分复用, 索引调制

Abstract: To solve the problem that the transmission rate of conventional asymmetrically clipped optical OFDM system with index modulation (OFDM) is not ideal, an asymmetrically clipped optical OFDM with enhanced index modulation system is proposed by selecting the active carrier twice to increase the index information carried by the active subcarrier and transmitting different modulation symbols on the active subcarrier. Meanwhile, the subcarrier selection algorithm is proposed to improve the bit error rate of the system. In particular, the modulation mapping principle of the proposed system is introduced in detail. Then, its theoretical bit error rate is derived by using the joint bound technique. Finally, the proposed system is compared with the conventional systems. The simulation results show that the proposed system not only increases the transmission rate but also improves the bit error rate. Specifically, when the turbulence is strong and the bit error rate is 1×10-3, the transmission rate of (8,3,3) the proposed system is 1.25 times higher than that of(8,6) conventional system, meanwhile the signal to noise ratio is improved by about 1.4 dB.

Key words: wireless optical communication, orthogonal frequency division multiplexing, index modulation.

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