矢量信号分析软件设计

发布时间：2018-01-13 19:32

本文关键词：矢量信号分析软件设计　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：在现代无线通信网络中,数字传输方式因其在频谱利用率和抗干扰方面的优势,已经成为通信领域普遍采用的传输方式。随之而来的是对各种数字调制信号分析的迫切需求。其中,矢量信号分析方法已经成为各种数字调制信号测试分析的主要方法,矢量信号分析是通信技术发展的重要基础。目前,矢量信号分析大多基于软件无线电的思想展开,用软件的方式来处理矢量信号分析已经成为一个大的趋势。因此,调制信号处理算法及相应的软件设计在矢量信号分析中越来越重要。本论文针对上述需求及发展趋势,以ASK、FSK和QPSK等数字调制信号的调制质量分析软件设计为研究对象。在深入的分析了当前国内外矢量信号分析仪发展现状的基础上,提出了一种低成本、高性价比的基于软件无线电的矢量信号分析解决方案。该方案以低成本的中频数据采集硬件平台为数据采集前端,利用数字正交解调方法来实现矢量信号的解调,以开环前向的载波频偏和相位联合估计算法来实现载波同步,以开环前向的定时相位估计算法来实现解调过程中的定时恢复。从而,对数字调制信号进行解调和判决,最终获得解调比特流。最后,根据误差矢量理论,利用解调结果产生参考信号,将参考信号与I/Q两路信号进行比较分析与计算,获得该数字调制信号的误差矢量幅度(EVM)、幅度误差以及相位误差等参数的统计结果以及星座图等描述数字调制信号调制质量的指标。在上述理论及算法研究的基础上,结合自动测试系统(ATS)设计的方法。利用程控仪器或者DAQ(数据采集板卡)作为前端数据采集的设备,与计算机组成自动测试系统的硬件平台。利用Labwindows/CVI这个测试软件开发平台进行矢量信号分析系统软件的设计和实现,最终组建成自动测试系统。在软件设计的过程中,遵循标准的软件开发流程,通过需求分析、软件体系结构设计、软件模块设计、数据处理和算法设计以及最后的系统调试,完成了系统软件的开发和测试系统的组建工作。
[Abstract]:In modern wireless communication networks, digital transmission mode has advantages in spectrum efficiency and anti-jamming. It has been widely used in the field of communication, followed by the urgent need for the analysis of various digital modulation signals. Vector signal analysis method has become the main method of digital modulation signal test and analysis. Vector signal analysis is an important basis for the development of communication technology. Vector signal analysis is mostly based on the idea of software radio. It has become a big trend to process vector signal by software. Modulation signal processing algorithm and corresponding software design are more and more important in vector signal analysis. This paper aims at the above requirements and development trend, using ASK. The software design of modulation quality analysis of digital modulation signals such as FSK and QPSK is studied. Based on the in-depth analysis of the current situation of vector signal analyzer at home and abroad, a low cost is proposed. The solution of vector signal analysis based on software radio with high performance and price ratio, which takes the low cost if data acquisition hardware platform as the front end of data acquisition. The digital quadrature demodulation method is used to demodulate the vector signal, and the open-loop forward carrier frequency offset and phase joint estimation algorithm is used to realize carrier synchronization. The open-loop forward timing phase estimation algorithm is used to realize the timing recovery in the demodulation process. Thus, the digital modulation signal is demodulated and determined, and finally the demodulated bit stream is obtained. Finally, according to the error vector theory. The reference signal is generated by the demodulation result, and the error vector amplitude of the digital modulation signal is obtained by comparing the reference signal with the I / Q signal. The statistical results of amplitude error and phase error and constellation diagram are used to describe the modulation quality of digital modulation signal. Combining with the design method of automatic test system (ATS), the program control instrument or DAQ (data acquisition board) is used as the front-end data acquisition equipment. The software of vector signal analysis system is designed and implemented by using Labwindows/CVI, which is a testing software development platform. In the process of software design, follow the standard software development process, through requirements analysis, software architecture design, software module design. Data processing, algorithm design and the final system debugging, completed the development of the system software and the establishment of the test system.
【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

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