多体制通信基带信号产生模块的设计与实现

发布时间：2018-03-16 03:01

本文选题：多体制基带信号　切入点：软件无线电　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：矢量信号源在当今通信系统的测试仪器中占有非常重要的位置,常用于数字通信接收设备的测试与检验。科学技术的发展与工艺的提高,系统性能得到很大提升,随之带来的问题是需要精度更高、功能更多的仪器来测试,而原有的信号发生器的性能显然已不能满足工业测试计量的需求。在此背景下,需要对数字基带信号发生技术再次进行深入研究,并设计出能够提供多体制、大带宽数字调制的基带信号发生器,以满足未来工业发展的需求和新一代矢量信号源的要求。本论文是以PXI矢量信号源项目为研究背景,着重研究了多体制通信基带信号产生及处理的相关理论和设计方法。总体方案是基于软件无线电的思想,以DSP+FPGA为硬件实现平台,经过设计与仿真验证,产生符合指标要求的多体制通信基带信号。本文研究的主要内容有:1、成型滤波单元设计。优化设计方案,通过实现成型滤波器的类型可选及参数可控等,降低设计的复杂度。采用DSP和FPGA相结合的设计方案,DSP负责系数计算与重配,而FPGA负责系数正确导入滤波器,从而完成成型滤波器系数的在线重载设计,实现了脉冲信号的成型滤波;2、变速率信号处理单元设计。基于多速率信号处理理论,采用FIR+CIC的插值补偿滤波器的设计方案,通过编写程序与仿真测试,其结果实现了变速率基带信号处理,同时也抑制了采样时钟带来的镜像失真;3、多普勒频移模拟单元设计。这部分的研究内容是为了适应新一代信号发生器对高动态目标信号模拟的需求。本设计是在信号发生器基础上,基于直接数字频率合成技术(DDS),产生多普勒频移信号,实现对运动目标的动态模拟。以上是本论文研究的主要内容,通过对相关理论的研究与分析,以矢量信号调制技术为基础,基于软件无线电思想,用可编程逻辑器件(FPGA)构建了一个具有开放性、标准化、模块化的通用硬件平台进行方案设计与实现,最终产生符合指标要求的多体制通信基带信号。
[Abstract]:The vector signal source occupies a very important position in the test instrument of the communication system nowadays. It is often used in the test and test of the digital communication receiving equipment. With the development of science and technology and the improvement of the technology, the performance of the system has been greatly improved. The resulting problem is that more accurate and more functional instruments are needed to test, and the performance of the original signal generator is obviously no longer able to meet the needs of industrial test metering. The technology of digital baseband signal generation needs to be further studied, and a baseband signal generator which can provide multi-system and large bandwidth digital modulation is designed. In order to meet the needs of the future industrial development and the requirements of the new generation vector signal source, this paper takes the PXI vector signal source project as the research background. This paper focuses on the related theory and design method of baseband signal generation and processing in multi-system communication. The overall scheme is based on the idea of software radio, using DSP FPGA as hardware implementation platform, and verified by design and simulation. The main contents of this paper are: 1: 1, design of shaping filter unit, optimization of design scheme, realization of type selection of shaping filter and controllable parameters, etc. In order to reduce the complexity of the design, the DSP and FPGA are used to calculate and rematch the coefficients, while the FPGA is responsible for the correct input of the coefficients into the filter, so as to complete the on-line heavy load design of the shaping filter coefficients. The design of pulse signal shaping filter and variable rate signal processing unit is realized. Based on the theory of multi-rate signal processing, the design scheme of interpolation compensation filter based on FIR CIC is adopted. The results show that variable rate baseband signal processing is realized. At the same time, the mirror distortion caused by the sampling clock is suppressed, and the Doppler frequency shift analog unit is designed. The purpose of this research is to meet the demand of the new generation signal generator for high dynamic target signal simulation. Based on the signal generator, Based on the direct digital frequency synthesizer (DDS) technique, Doppler frequency shift signal is generated and the dynamic simulation of moving target is realized. The above is the main content of this paper. Through the research and analysis of related theory, it is based on vector signal modulation technology. Based on the idea of software radio, a general hardware platform with openness, standardization and modularization is constructed with programmable logic device (FPGA) to design and implement the scheme. Finally, a multi-system communication baseband signal that meets the requirements of the index is generated.
【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】：TN911.7

【共引文献】