基于过采样的线性调频匹配滤波器的研制  

Development of Linear Frequency Modulation Matched Filter Using Oversampling

作　　者：钟俊龙 邱健[1] 骆开庆[1] 李榕[1] 彭力[1] 刘冬梅[1] 韩鹏[1] Zhong Junlong;Qiu Jian;Luo Kaiqing;Li Rong;Peng Li;Liu Dongmei;Han Peng(School of Physics and Telecommunications Engineering,South China Normal University,Guangzhou,Guangdong 510006,China)

机构地区：[1]华南师范大学物理与电信工程学院,广东广州510006

出　　处：《激光与光电子学进展》2020年第19期64-73,共10页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61975058);广东省自然科学基金(2019A1515011401);广州市科技计划重点项目(201707010485);广州市科技项目(201704020137);华南师大物电学院蓝盾信息安全技术联合实验室课题项目(LD20170208)。

摘　　要：针对可见光定位的信源在空间传输中抗干扰能力差、易失真,且接收信号的信噪比(SNR)会随传输距离的增加而显著降低等问题,设计了一款线性调频(LFM)信号同步检测的时域匹配滤波器。该匹配滤波器的特点是结合了过采样与互相关正交算法,将它应用在LFM信号的可见光定位中,可以有效地提高信号传输的距离。基于现场可编程门阵列器件完成了LFM时域匹配滤波器的逻辑设计与集成。在长距离可见光通信的同步检测实验中,在6 m通信距离内,该匹配滤波器同步检测的正确率超过99%,这为将来采用LFM信号进行可见光定位的应用奠定了基础。This paper presents a time-domain matched filter for synchronous detection of linear frequency modulation(LFM)signals to consider the influence of poor anti-interference ability and distortion of visible light location source in space transmission and the signal to noise ratio(SNR).The SNR of a received signal decreases significantly with the increase in transmission distance.The matched filter is characterized by a combination of oversampling and a cross-correlation orthogonal algorithm.The application of the proposed filter to the visible light location of the LFM signal effectively improves the signal transmission distance.The logic design and integration of the LFM time-domain matched filter are completed using a field programmable gate array.In the synchronous detection experiment of long-distance visible light communication,the accuracy of synchronous detection of the matched filter is more than 99%at a communication distance of 6 m,which lays a foundation for the application of the LFM signal in the visible light location in the future.

关 键 词：光纤光学 可见光定位 低信噪比 匹配滤波器 现场可编程门阵列 

分 类 号：TN929.1[电子电信—通信与信息系统]