摘要
随着5G、WiFi通信技术的不断发展以及超宽带信号(UWB)高精度定位系统的广泛应用,在室内空间下正交频分复用信号(OFDM)与UWB信号的共存互干扰不可忽视。采用等效载噪比的分析方法,结合两者物理特性,使用MATLAB搭建两系统物理层模型,根据谱分离系数来计算干扰信号随接收信号进入接收机而引起的噪声量,进而通过受干扰情况下接收机的等效信噪比获得OFDM通信系统的误码率和UWB系统的定位精度。仿真结果表明,OFDM信号与UWB信号间存在同频信号干扰,干扰中心处UWB信号定位误差放大12倍以上,OFDM通信信号误码率上升至10;左右,即信号同频互干扰会造成5G、WiFi等通信系统性能下降的同时严重影响UWB系统的定位精度。通过提出基于分布式低功率微基站的系统部署优化方案,实现了实验区域内通信性能几乎不变情况下定位性能的显著提高,整个实验区域均可保证分米级的定位精度。研究结果可为5G通信系统与UWB定位系统的一体化设计与设备部署提供参考。
With the development of 5 G,WiFi communication technology and the wide application of ultra wideband(UWB) high precision positioning system, the mutual interference between orthogonal frequency division multiplexing(OFDM) signal and UWB signal cannot be ignored in indoor space. The analysis method of system equivalent carrier to noise ratio is adopted, combined with the physical characteristics of the two systems, and the physical layer model of the two systems is built by MATLAB. According to the spectral separation coefficient, the amount of noise caused by the interference signal entering the receiver is calculated, and then the BER of OFDM communication system and the positioning accuracy of UWB system are obtained by the equivalent signal to noise ratio of the receiver in the case of interference. Simulation results show that there is signal interference between OFDM signal and UWB signal. The positioning error of UWB signal at the interference center is amplified by more than 12 times, and the bit error rate of OFDM communication signal rises to about 10;. In other words, the same frequency mutual interference of signals will degrade the performance of 5 G, WiFi and other communication systems and seriously affect the positioning accuracy of UWB system. Through the proposed system deployment optimization scheme based on distributed low-power micro-base station, the positioning performance is significantly improved in the case of almost constant communication performance in the experimental area, and the decimeter positioning accuracy can be guaranteed in the whole experimental area. The research results can provide reference for the integrated design and equipment deployment of 5 G communication system and UWB positioning system.
作者
崔宋祚
蔚保国
鲍亚川
Cui Songzuo;Yu Baoguo;Bao Yachuan(State Key Laboratory of Satellite Navigation System and Equipment Technology,The 54th Research Institute of China Electronics Technology Group Corporation,Shijiazhuang 050081,China)
出处
《电子测量技术》
北大核心
2021年第18期160-166,共7页
Electronic Measurement Technology
关键词
信号兼容性
等效载噪比
误码率
定位精度
signal compatibility
equivalent carrier to noise ratio
bit error rate
positioning accuracy
