一种多带非相干光子太赫兹通信系统中的SSBI抑制技术  

SSBI Mitigation Technique for Multiband Incoherent Photonics-Assisted Terahertz Communication System

作　　者：雷明政 方苗苗 朱敏 蔡沅成 张教 华炳昌 田亮 LEI Mingzheng;FANG Miaomiao;ZHU Min;CAI Yuancheng;ZHANG Jiao;HUA Bingchang;TIAN Liang(Purple Mountain Laboratories,Nanjing 211111,China;National Mobile Communications Research Laboratory,Southeast University,Nanjing 210096,China)

机构地区：[1]网络通信与安全紫金山实验室,江苏南京211111 [2]东南大学移动通信国家重点实验室,江苏南京210096

出　　处：《移动通信》2023年第5期38-45,共8页Mobile Communications

基　　金：国家自然科学基金(62201393,62271135);国家重点研发项目(2022YFB2903800);鹏城实验室重点项目(PCL2021A01-2)。

摘　　要：光子太赫兹通信具有大带宽、低传输损耗等优势,故成为6G超高速无线通信的研究热点。由于极低的用户端复杂性和成本,基于非相干的包络检波太赫兹接收技术备受关注。提出了一种多带非相干光子太赫兹通信系统。通过多带自适应调制,实现高性能太赫兹点对多点覆盖传输;此外,通过光域自适应滤波,抑制非相干包络检波时多带之间的信号-信号拍频串扰,实现每个子带信号的低算法复杂度和低功耗接收。实验中,根据系统的传输响应,3个子带分别使用5.75 G Baud 64QAM、16QAM和4QAM的自适应调制方式;再通过自适应单边带光滤波,接收端仅使用最小均方均衡算法即成功实现了300 GHz频段多带太赫兹信号的2 m无线传输。Photonic terahertz(THz)communication has emerged as a prominent research area in 6G ultra-high-speed wireless communication,owing to its remarkable benefits of large bandwidth and low transmission loss.The incoherent envelope detection-based THz reception technology has garnered attention for its low user-side complexity and cost-effectiveness.This paper presents a novel multi-band incoherent photonic THz communication system that achieves high-performance THz point-to-multipoint coverage transmission via multi-band adaptive modulation.Moreover,optical domain adaptive filtering is incorporated to mitigate the signal-to-signal beat interference(SSBI)between multiple bands during incoherent envelope detection,facilitating low algorithmic complexity and low power consumption reception for each sub-band signal.In the experiment,adaptive modulation schemes of 5.75 GBaud 64QAM,16QAM,and 4QAM are applied to three sub-bands,respectively,based on the system's transmission response.By leveraging adaptive single-sideband optical filtering and employing the minimum mean square equalization algorithm,successful wireless transmission of multi-band THz signals in the 300 GHz frequency range is accomplished over a distance of 2 meters.

关 键 词：光子太赫兹通信 包络检波 自适应调制 自适应光滤波 信号-信号拍频串扰 

分 类 号：TN929.5[电子电信—通信与信息系统]