基于多径环境下的非同步OFDM网络定位技术

OFDM作为先进的通信技术在无线基站BS对无线目标节点设备精准定位中发挥着至关重要的作用，但对2个无线设备之间信号传播及到达时间的要求比较高，这使得在室内环境下的应用受限。基于此，本文基于已知位置参考节点和BSs传输，通过目标节点和参考节点上的采集样本导出目标的近似ML位置，提出一种基于非同步BSs传输的OFDM信号目标节点精确位置计算方法。将提出的方法应用于现有的无线定位测试系统中，实验结果表明，基于非同步BSs传输的OFDM信号目标节点精确位置计算方法，能够在不需要对BSs传播进行任何修改的情况下对室内无线设备进行精准定位，对室内环境下无线设备位置的精准定位具有一定的实际指导意义。

Non-synchronous OFDM Network Location Technology Based on Multipath Environment

As an advanced communication technology, OFDM plays an important role in the accurate positioning of wireless target node equipment in the wireless base station (BS), but the requirements of signal propagation and arrival time between two wireless devices are relatively high, which makes the application in indoor environment limited. Therefore, based on the known location reference node and BSs transmission, this paper derives the approximate ML position of the target from the collected samples on the target and reference nodes, and proposes an accurate location calculation method of OFDM signal target node based on asynchronous BSs transmission. The proposed method is applied to the existing wireless positioning test system, and the experimental results show that the accurate position calculation method of OFDM signal target node based on asynchronous BSs transmission can accurately locate indoor wireless equipment without any modification of BSs transmission, which has a certain practical significance for the accurate positioning of wireless devices in indoor environment.