基于COFDM的实时无线图传系统设计与实现  

Design and implementation of real-time wireless graph transmission system based on COFDM

作　　者：刘成凯 孙运强[1] 姚爱琴[1] 彭东升 石喜玲 Liu Chengkai;Sun Yunqiang;Yao Aiqin;Peng Dongsheng;Shi Xiling(School of Communication and Information Engineering,North University of China,Taiyuan 030051,China;School of Electrical and Control Engineering,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学信息与通信工程学院,太原030051 [2]中北大学电气与控制工程学院,太原030051

出　　处：《国外电子测量技术》2024年第8期134-140,共7页Foreign Electronic Measurement Technology

基　　金：山西省基础研究计划(20210302123062)项目资助。

摘　　要：随着无线图像传输的兴起,相关传输技术也得到大力发展,但在山区、海面、密集城区等复杂无线通信环境中,WiFi、ZigBee、4G/5G等技术图传性能较差,而编码正交频分复用(COFDM)技术以其传输速率高,抗干扰能力强等特点,成为当前研究热点。为满足复杂无线通信环境下无线图传的大速率、低时延和高可靠的性能需求,缩短无线图传通信产品的设计周期,在COFDM技术的基础上,搭建了基于通用硬件外设USRP和软件无线电平台GNU Radio的COFDM无线图传系统,该系统采用Gstreamer技术对摄像头视频流进行采集与处理,实现720 P视频图像实时传输,视频传输速率4000 Kbit/s。结果表明,该系统实现了长时间且稳定的无线视频实时传输,说明了系统设计的灵活性和方案设计的有效性。With the rise of wireless image transmission,related transmission technologies have also been greatly developed.However,in complex wireless communication environments such as mountains,sea surfaces,and densely populated urban areas,WiFi,ZigBee,4G/5G,etc.have poor transmission performance,while the coding orthogonal frequency division multiplexing(COFDM)technology has become a research hotspot due to its high transmission rate,strong anti-interference ability,etc.To meet the performance requirements of high transmission rate,low latency,and high reliability in complex wireless communication environments for wireless image transmission,and to shorten the design cycle of wireless image transmission communication products,this paper analyzed and studied the COFDM technology and built a COFDM wireless image transmission system based on the general hardware peripheral USRP and software radio platform GNU Radio.The system uses Gstreamer technology to collect and process the video stream from the camera and achieves real-time transmission of 720 P video images at a video transmission rate of 4000 Kbit/s.The results show that the system has achieved long-term and stable wireless video real-time transmission,which demonstrates the flexibility of the system design and the effectiveness of the scheme design.

关 键 词：软件无线电 COFDM 无线图传 实时传输 GNU Radio 

分 类 号：TN914.3[电子电信—通信与信息系统]