无积分误差的双相关频差补偿信道测试方法  

Channel sounding without integral error by dual-correlation to compensate frequency difference between transmitter and receiver

作　　者：程如琪 张仿琪 王大庆[3] 郑国莘[1] Cheng Ruqi;Zhang Fangqi;Wang Daqing;Zheng Guoxin(Key laboratory of Specialty Fiber Optics and Optical Access Networks,Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication,Shanghai Institute for Advanced Communication and Data Science,Shanghai University,Shanghai 200444,China;Maglev Transportation Engineering R&D center,Tongji University,The Key Laboratory of Road and Traffic Engineering,Tongji University,Ministry of Education,Shanghai 201804,China;Technical Center of Shanghai Shentong Metro Group Co.,Ltd.,Shanghai 201103,China)

机构地区：[1]上海大学特种光纤与光接入网重点实验室,特种光纤与先进通信国际合作联合实验室,上海先进通信与数据科学研究院,上海200444 [2]同济大学磁浮交通工程技术研究中心同济大学道路与交通工程教育部重点实验室,上海201804 [3]上海申通地铁集团有限公司技术中心,上海201103

出　　处：《电子测量技术》2020年第4期23-28,共6页Electronic Measurement Technology

基　　金：2019-2022国家自然科学基金面上项目漏泄电缆的群信道的相关性及其MIMO系统综合性能的研究(NSFC61871261);“十三五”国家重点研发计划任务(2016YFB1200602-02)资助项目。

摘　　要：针对未来无人机、航天、地铁等无法同步的无线信道测试工程中,收发端无法同步的问题,提出了一种无积分误差的双相关频差补偿信道测试方法,预先设置频差,在训练阶段存储频差参数,在测试后对随机序列以及频差实施相关运算,补偿收发端之间的频差影响。提出了数值预置、直连获取、信道获取等3种频差获取方案,适用于不同的工作环境。理论分析与实验表明所提方法在任意频差下,均能有确定性输出,且随着收发间频差的增加,最终输出可收敛于同步情况下输出幅度的一半,解决了特殊环境下信道检测的难题。This letter presents a wireless channel sounding method for unmanned aerial vehicles(UAV),aerospace,metro and other scenarios,when the synchronization between the transmitter and receiver is difficult.The principle of this method is setting the frequency difference between the transmitter and receiver in advance,detecting the frequency difference in the training step,and performing the double correlation operation on the random sequence and frequency difference in the working step.This method eliminates the influence of the frequency difference between the transmitter and receiver,and achieves the channel impulse response(CIR)without integral error.In this letter,three kinds of differential frequency acquisition schemes for different working environments are proposed,which are numerical preset,direct connection acquisition and the wireless channel acquisition.Theoretical analysis and experimental results demonstrate that this method has the advantage of definite output under any frequency difference.With the increase of frequency difference,the final output converges to half of the synchronous output amplitude,which provides a solution for the channel sounding in some special environments.

关 键 词：信道测试 频差 训练阶段 测试阶段 

分 类 号：TN92[电子电信—通信与信息系统]