LTE基站测试仪关键技术研究

发布时间：2018-07-13 13:12

【摘要】：测试仪器是移动通信产业链不可或缺的组成部分,其中基站测试仪是移动网络的建设和优化的重要工具之一。LTE网络是主流的4G移动通信标准,已经开始在世界范围内部署,市场规模极其庞大,研制适用于LTE标准的基站测试仪具有重要的实际应用价值。本文首先研究了与基站测试仪开发密切相关的下行链路物理层协议,包括帧结构、资源分配方式、各物理信道以及下行链路处理过程等;然后依据协议规定搭建了LTE的MATLAB模型,验证了对协议的理解,同时为后续的算法研究提供仿真平台;最后总结了LTE基站测试仪应具备的功能,并给出了部分测试功能的实现方案。为了提高频谱效率,LTE采用同频组网,但是会导致相邻小区间相互干扰。基站测试仪需要准确测量某一空间位置上存在的小区信号数量以及各个小区的信号功率强度,从而为网络建设和优化提供参考。针对上述问题,本文提出了结合逐次干扰消除、DFT去噪的信道估计、多帧合并、相干检测与非相干检测的多小区检测方案,并优化了搜索策略、同步信号重建方法、小区判决参数设置;最后对所提方案做了仿真验证;结果表明,在扩展步行信道条件下,该方案正确检测概率可达95%以上,满足实际应用需要。
[Abstract]:The test instrument is an indispensable part of the mobile communication industry chain, in which the base station tester is one of the important tools for the construction and optimization of mobile network. LTE network is the mainstream 4G mobile communication standard, and has been deployed worldwide. The market scale is extremely large, so the development of base station tester suitable for LTE standard has important practical application value. This paper first studies the downlink physical layer protocol which is closely related to the development of the base station tester, including frame structure, resource allocation mode, physical channel and downlink processing process, and then builds the MATLAB model of LTE according to the protocol. The understanding of the protocol is verified, and the simulation platform is provided for the subsequent algorithm research. Finally, the functions of the LTE base station tester are summarized, and the implementation scheme of some test functions is given. In order to improve the spectral efficiency, LTE uses the same frequency network, but it will result in the interference between adjacent cells. In order to provide reference for network construction and optimization, the base station tester needs to accurately measure the number of cell signals in a space position and the signal power intensity of each cell. In order to solve the above problems, this paper proposes a multi-cell detection scheme based on channel estimation, multi-frame merging, coherent detection and non-coherent detection combined with successive interference to eliminate DFT noise, and optimizes the search strategy and synchronous signal reconstruction method. Finally, the proposed scheme is simulated and verified. The results show that the correct detection probability of the scheme can reach more than 95% under the condition of extended walking channel, which meets the practical application needs.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

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