TD-LTE航空无线宽带信号接入问题的研究

发布时间：2018-03-03 18:10

本文选题：航空无线宽带通信　切入点：高空平台通信系统　出处：《中国民航大学》2014年硕士论文　论文类型：学位论文

【摘要】：要真正地实现航空无线宽带通信服务,需满足航空高空环境下自由的无线宽带信号接入。地面宽带无线信号接入技术都是基于120km/h以下低速环境。而航空无线宽带通信处于高速移动的环境,因此会产生新的信号接入问题。航空宽带信号接入需要考虑隔离度问题、损耗问题、子载波间的干扰问题以及多普勒(Doppler)频偏等问题。首先,本文对航空无线宽带信号接入网络,分别设计出了基于基站、移动卫星以及高空通信平台系统(The High Altitude Platform Stations,HAPS)的航空无线宽带信号接入网模型。其次,对于航空无线宽带信号接入的隔离问题,本文提出了采用改进的混合算法计算天馈系统隔离度,该方法相对于原算法提高了计算效率。针对航空客舱内无线宽带信号接入损耗严重的问题,提出了设计飞机—地面回传系统的思想,通过这个系统,能够较好地解决信号接入的损耗。最后,针对信号接入的子载波干扰(ICI,inter channel interference)问题,提出采用移动加权算法优化的ICI抑制算法,能够更大程度抑制信号接入ICI。针对信号接入Doppler频偏问题,提出采用优化的频偏预处理算法后,能够更加准确地判决Doppler频偏。另外提出了借助Rake技术对Doppler频偏进行处理。仿真结果表明,上述方法能够较好地解决高速环境下信号接入的Doppler频偏问题。
[Abstract]:To truly achieve aviation wireless broadband communication services, The ground broadband wireless signal access technology is based on the low speed environment below 120 km / h, and the aviation wireless broadband communication is in the high-speed mobile environment. Therefore, there will be a new problem of signal access. The problem of isolation, loss, inter-carrier interference and Doppler Doppler frequency offset should be considered in aeronautical broadband signal access. The model of aeronautical wireless broadband signal access network based on base station, mobile satellite and the High Altitude Platform stations is designed. Secondly, the isolation problem of aeronautical wireless broadband signal access is discussed. In this paper, an improved hybrid algorithm is proposed to calculate the isolation degree of the space-fed system. Compared with the original algorithm, this method improves the computational efficiency. The idea of designing aircraft-ground backhaul system is presented. By this system, the loss of signal access can be solved well. Finally, aiming at the subcarrier interference of signal access, the problem of ICII inter channel interference is discussed. An optimized ICI suppression algorithm based on mobile weighted algorithm is proposed, which can suppress the signal access to Doppler to a greater extent. In view of the problem of signal access to Doppler frequency offset, an optimized frequency offset preprocessing algorithm is proposed. The Doppler frequency offset can be judged more accurately. In addition, the Doppler frequency offset is processed by using Rake technology. The simulation results show that the above method can solve the Doppler frequency offset problem of signal access in high speed environment.
【学位授予单位】：中国民航大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

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