软件无线电平台中频谱分析波形设计与实现

发布时间：2018-04-09 05:14

本文选题：软件无线电　切入点：频谱分析　出处：《电子科技大学》2014年硕士论文

【摘要】：频谱分析仪作为频域测量的基本工具,在科研和生产中都具有重要的意义。而近年来,无线通信的发展使得对频谱资源的需求和使用不断增多,导致频谱空间环境越发复杂。这对频域测量工具频谱分析仪的灵活性、可配置性和开放性提出了更高的要求,而这些要求正好符合软件无线电技术的思想。软件无线电的基本思想是在一套标准化、模块化的通用硬件平台上,用软件的方法实现各种不同业务,以满足各种不同的需求。现代的频谱分析仪中开始采用这种结构,即模拟的射频接收端和全数字式的中频处理系统,这种结构可以实现高频率分辨率和多测量功能。该结构中全数字式的中频处理系统是实现高性能频谱分析的关键。本文的目的就是给出软件无线电平台中频谱分析数字中频的实现方案,并利用该平台验证方案的可行性,这样既能有效模拟实际的频谱分析仪,又能利用通用的硬件平台降低研究成本。设计方案中将频谱分析的数字中频处理部分划分为几个基本模块,包括将中频信号搬移到基带的数字混频模块、减少频谱混叠并降低数据采样率的级联积分梳状滤波模块和级联半带滤波模块、实现离散信号频谱分析的频谱计算模块和控制时序、参数的参数控制模块。设计的频谱分析数字中频处理方案将中心频率70MHz、采样率230.4MSPS的中频信号作为输入,需要实现30Hz~30kHz的频率分辨率,用FPGA中资源较为丰富的Xilinx Virtex6 xc6vsx315t作为数字中频的处理芯片。在软件无线电平台上的验证结果表明:方案中各个模块功能正常;中频方案的动态范围能达到65dB;实际的频率分辨率在可分析的误差范围内。
[Abstract]:As a basic tool of frequency domain measurement, spectrum analyzer is of great significance in scientific research and production.In recent years, with the development of wireless communication, the demand and use of spectrum resources are increasing, which leads to the complexity of spectrum space environment.This puts forward higher requirements for the flexibility, configurability and openness of the frequency domain measurement tool spectrum analyzer, and these requirements are in line with the idea of software radio technology.The basic idea of software radio is to realize all kinds of different services with software method on a set of standardized and modularized general hardware platform to meet different requirements.The modern spectrum analyzer has adopted this structure, that is, analog RF receiver and full-digital intermediate frequency processing system, which can achieve high frequency resolution and multi-measurement functions.Digital if processing system is the key to high performance spectrum analysis.The purpose of this paper is to give the realization scheme of spectrum analysis digital if in the software radio platform, and use this platform to verify the feasibility of the scheme, which can effectively simulate the actual spectrum analyzer.It can also reduce the research cost by using the common hardware platform.In the design scheme, the digital if processing part of the spectrum analysis is divided into several basic modules, including the digital mixing module which moves the intermediate frequency signal to the baseband.The concatenated integral comb filter module and the cascade half-band filter module which can reduce spectrum aliasing and data sampling rate are used to realize the spectrum calculation module and control timing module of discrete signal spectrum analysis and the parameter control module of parameters.The digital intermediate frequency processing scheme for spectrum analysis takes the if signal of the central frequency 70 MHz and the sampling rate 230.4MSPS as the input. It needs to realize the frequency resolution of the 30Hz~30kHz. The Xilinx Virtex6 xc6vsx315t, which is rich in resources in FPGA, is used as the digital if processing chip.The verification results on the software radio platform show that the function of each module in the scheme is normal, the dynamic range of the if scheme can reach 65 dB, and the actual frequency resolution is within the analytical error range.
【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】：TM935.21

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