基于频率正交时间反演的空间聚焦虚拟覆盖方法研究  

Research on space focusing virtual coverage based on orthogonal frequency time reversal method

作　　者：聂益芳[1,2,3] 李方伟 NIE Yifang;LI Fangwei(School of Communication and Information Engineering,Chongqing University of Posts & Telecommunications,Chongqing 400065,China;Chongqing Key Laboratory of Mobile Communications,Chongqing University of Posts & Telecommunications,Chongqing 400065,China;College of Environment and Resources,Chongqing Technology & Business University,Chongqing 400067,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065 [2]重庆邮电大学移动通信关键技术重庆市重点实验室,重庆400065 [3]重庆工商大学环境与资源学院,重庆400067

出　　处：《通信学报》2019年第10期30-41,共12页Journal on Communications

基　　金：国家自然科学基金资助项目(No.61771084,No.61102062,No.61271260);重庆市教委科学技术基金资助项目(No.KJQN201800834)~~

摘　　要：针对超密集无线网中的信息泄露和传输覆盖效率问题,提出了基于频率正交时间反演的虚拟覆盖方法。首先,以正交子载波区分各信道,降低相关度;其次,进行时间反演,让各目标信号在目的用户附近空间聚焦;然后,研究推导出覆盖范围与信号干扰噪声比理论表达式并进行论证;最后,在确保用户覆盖需求的基础上,无关用户的覆盖范围缩小,形成了虚拟覆盖。仿真表明,在不增加功率和天线情况下,虚拟覆盖增加了接收信号难度,提升了可靠传输的安全速率和系统容量。To solve the problem of information leakage and coverage efficiency in ultra-dense wireless network,the orthogonal frequency-time reversal virtual coverage scheme was proposed.At first,different wireless reversal channels with lower correlation were distinguished by orthogonal carries.Next,after time reversal,the space focusing of each target signal was realized around the terminal.Then,theoretical expressions of the signal coverage and the signal- interference-to-noise ratio were derived and proved.Ultimately,the virtual coverage was shaped,meeting the requirements of users.The coverage of unrelated user not belonging to system was reduced.The results show that those unrelated users are difficult to receive the target signal because of virtual coverage.In addition,the system has higher capacity and security rate of reliable transmission without any more power or antennas.

关 键 词：无线超密集网 可靠传输 频率正交时间反演 虚拟覆盖 

分 类 号：TN918.9[电子电信—通信与信息系统]