无线衰落信道模拟的仿真研究与实现

发布时间：2018-03-27 19:09

本文选题：DSP　切入点：瑞利信道　出处：《电子科技大学》2014年硕士论文

【摘要】：无线信道是整个无线通信系统的核心研究内容。无线通信系统在进行外场测试信道环境时,不仅具有容易受气候条件的影响,试验不可重复性等特点,而且还要花费大量的人力、物力和财力。而信道仿真器可以在实验室内模拟各种典型的无线信道环境,它不易受外界环境的影响,可以降低试验成本,并且试验还具有可重复性。因此本论文就以多制式宽带通信模拟测试技术为研究背景,主要研究了该项目中的信道模拟技术的相关理论以及实现算法,并以DSP为硬件平台,对多制式宽带通信多径衰落信道模拟技术进行了实现,在现有平台的基础上,为通信系统的测试加入了信道环境。本文首先研究了无线移动信道的基本特性。其次研究了衰落信道模拟的算法仿真,它们包括:瑞利信道模型、莱斯信道模型、高斯信道模型以及信道模拟中的多径延时等。通过对这些原理的研究,推导了它们的具体实现算法。然后在此基础上,本文以DSP为硬件平台,搭建了无线衰落信道模拟实现的整体架构,详细分析了架构的总体设计方案及功能模块的设计方案。整个模块由多制式信号、多径延时、瑞利衰落、莱斯衰落、高斯信道等单元模块组成。随后用Matlab对多制式信号的产生、信道模拟中多径延时算法、瑞利衰落因子和莱斯衰落因子产生及其统计特性、高斯白噪声产生算法等功能模块进行了仿真研究。其次介绍了本文所选芯片TMS320C6416TGLZ的结构和功能及其开发环境,给出了衰落信道模拟以及多径延时算法的具体软件实现方案,并在DSP中进行了实现。最后,重点研究了以DSP为核心的无线衰落信道模拟整体功能的实现,使用频谱分析仪测试基带信号QPSK通过模拟信道后的矢量图,然后对其矢量图进行分析,采用Matlab对信道模拟的仿真结果进行了验证,通过与理论值进行对比,可以证明论文所提出的信道模拟算法是切实可行的。通过对相关理论的分析和推导、相应算法的仿真验证以及DSP平台实现,本文最终在理论算法研究和硬件实现两方面均很好地完成了无线衰落信道模拟技术的实现。通过测试和验证,所得结果符合项目指标要求。
[Abstract]:Wireless channel is the core research content of the whole wireless communication system. When the wireless communication system carries on the external field test channel environment, it is not only easy to be affected by the climatic conditions, but also not repeatable. And it also costs a lot of manpower, material and financial resources. The channel simulator can simulate a variety of typical wireless channel environments in the laboratory, it is not easily affected by the external environment, and it can reduce the cost of the experiment. And the experiment is repeatable. Therefore, this paper mainly studies the theory and algorithm of channel simulation technology in this project, and takes DSP as the hardware platform. The simulation technology of multipath fading channel for multi-standard broadband communication is implemented. On the basis of the existing platforms, The basic characteristics of wireless mobile channel are studied in this paper. Secondly, the algorithm simulation of fading channel simulation is studied, which includes Rayleigh channel model, Rice channel model, Rayleigh channel model and Rice channel model. Gao Si channel model and multipath delay in channel simulation. Through the research of these principles, the realization algorithm of Gao Si channel model and channel simulation is deduced. Based on this, this paper takes DSP as the hardware platform, The overall architecture of wireless fading channel simulation is built, and the overall design scheme and function module are analyzed in detail. The whole module is composed of multi-standard signal, multi-path delay, Rayleigh fading and Rice fading. Gao Si channel and other unit modules. Then the generation of multi-standard signals with Matlab, the multipath delay algorithm in channel simulation, the generation of Rayleigh fading factor and Rice fading factor and their statistical characteristics, Gao Si white noise generation algorithm and other functional modules are simulated. Secondly, the structure, function and development environment of the chip TMS320C6416TGLZ selected in this paper are introduced, and the specific software implementation scheme of fading channel simulation and multipath delay algorithm is given. Finally, the realization of the overall function of wireless fading channel simulation based on DSP is studied, and the vector diagram of baseband signal QPSK passing through the analog channel is tested by spectrum analyzer. Then the vector diagram is analyzed, and the simulation results of channel simulation are verified by Matlab, and the results are compared with the theoretical values. It can be proved that the proposed channel simulation algorithm is feasible. Through the analysis and derivation of the relevant theories, the simulation of the corresponding algorithm and the implementation of DSP platform, In this paper, the simulation technology of wireless fading channel is well realized in the aspects of theoretical algorithm research and hardware implementation. Through testing and verification, the results are in line with the requirements of the project.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN92

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