宽带正交数字调制信号的产生与研究
发布时间：2019-02-23 23:21
【摘要】：矢量信号源作为通信系统中最重要的测试仪器之一,常常被用在数字通信的测试中,其本身的性能指标是决定测试准确性的重要因素。随着科学技术的突飞猛进,数字通信系统的性能得到了很大的提升,因而对源的精确性和多样性有了更高的需求。如何产生宽带正交的调制信号,是矢量信号源研究的关键问题,也是电子信息相关领域快速发展后对新一代的矢量信号源提出的要求。本文即在此背景下,对数字信号处理和通信技术方面的相关理论进行分析和研究后,重点针对矢量信号源中的基带部分进行设计。系统采用了软件无线电(SDR)的设计思路,使用可编程逻辑门阵列(FPGA)作为通用的硬件平台,并在此平台上构建可配置的基带模块,产生通用的宽带数字调制基带信号,并将该基带信号正交混频至所需的载频上。经过测试验证,设计完成的调制信号源可以正确产生FSK、PSK、QAM等多种通用的数字调制信号。系统基带数据码率从1Ksps至20Msps之间连续可调,产生的调制信号质量良好,满足设计要求。本设计的主要工作包括:系统时钟方案的设计。本文采用DDS产生频率可调的参考时钟信号,然后结合FPGA内部的锁相环产生一组相关的时钟。整个系统基于这些时钟进行设计,通过调整参考时钟的频率和锁相环的分频比得到连续可调的时钟,进而得到码率连续可调的基带信号。基带信号生成模块的设计。基带数据采用M序列进行模拟,然后对数据进行编码映射、成型滤波和可变插值。其中成型滤波器单元采用参数集的方法进行设计,使成型滤波器的类型和参数可以动态配置,可变插值部分采用半带滤波器和CIC滤波器组合的方式进行设计,实现可调节的插值倍数。上变频部分的设计。主要由数字的正交混频和模拟的正交混频两部分构成。模拟正交混频将基带搬移至100MHz~3GHz的载频上,而在双通道的设计中,数字正交混频为信道提供合适的频率偏移。
[Abstract]:As one of the most important testing instruments in communication system, vector signal source is often used in the test of digital communication. Its performance index is an important factor to determine the accuracy of the test. With the rapid development of science and technology, the performance of digital communication systems has been greatly improved, so there is a higher demand for the accuracy and diversity of sources. How to produce wide-band quadrature modulated signal is a key problem in the research of vector signal source, and it is also the requirement of the new generation vector signal source after the rapid development of electronic information related field. Under this background, this paper analyzes and studies the related theories of digital signal processing and communication technology, and focuses on the design of the baseband part of the vector signal source. The system adopts the design idea of software radio (SDR), uses programmable logic gate array (FPGA) as the general hardware platform, and constructs the configurable baseband module on this platform to produce the general broadband digital modulation baseband signal. The base band signal is orthogonal mixed to the desired carrier frequency. It is proved by test that the designed modulation signal source can produce many kinds of general digital modulation signals such as FSK,PSK,QAM correctly. The baseband data rate of the system can be adjusted continuously from 1Ksps to 20Msps. The modulation signal produced is of good quality and meets the design requirements. The main work of this design includes: the design of system clock scheme. In this paper, DDS is used to generate a reference clock signal with adjustable frequency, and then a set of related clocks is generated by combining the phase-locked loop inside the FPGA. The whole system is designed on the basis of these clocks. By adjusting the frequency of the reference clock and the frequency division ratio of the phase-locked loop, the continuously adjustable clock is obtained, and then the continuously adjustable baseband signal is obtained. Design of baseband signal generation module. The baseband data is simulated by M sequence, then encoded by mapping, shaping filtering and variable interpolation. The shaping filter unit is designed by the method of parameter set, so that the type and parameters of the shaping filter can be dynamically configured, and the variable interpolation part is designed by the combination of half-band filter and CIC filter. Realize adjustable interpolation multiple. The design of upconversion part. It is mainly composed of digital orthogonal mixing and analog orthogonal mixing. The analog orthogonal mixing moves the baseband to the carrier frequency of the 100MHz~3GHz. In the design of two channels, the digital orthogonal mixing provides the appropriate frequency offset for the channel.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN911.3
本文编号：2429324
[Abstract]:As one of the most important testing instruments in communication system, vector signal source is often used in the test of digital communication. Its performance index is an important factor to determine the accuracy of the test. With the rapid development of science and technology, the performance of digital communication systems has been greatly improved, so there is a higher demand for the accuracy and diversity of sources. How to produce wide-band quadrature modulated signal is a key problem in the research of vector signal source, and it is also the requirement of the new generation vector signal source after the rapid development of electronic information related field. Under this background, this paper analyzes and studies the related theories of digital signal processing and communication technology, and focuses on the design of the baseband part of the vector signal source. The system adopts the design idea of software radio (SDR), uses programmable logic gate array (FPGA) as the general hardware platform, and constructs the configurable baseband module on this platform to produce the general broadband digital modulation baseband signal. The base band signal is orthogonal mixed to the desired carrier frequency. It is proved by test that the designed modulation signal source can produce many kinds of general digital modulation signals such as FSK,PSK,QAM correctly. The baseband data rate of the system can be adjusted continuously from 1Ksps to 20Msps. The modulation signal produced is of good quality and meets the design requirements. The main work of this design includes: the design of system clock scheme. In this paper, DDS is used to generate a reference clock signal with adjustable frequency, and then a set of related clocks is generated by combining the phase-locked loop inside the FPGA. The whole system is designed on the basis of these clocks. By adjusting the frequency of the reference clock and the frequency division ratio of the phase-locked loop, the continuously adjustable clock is obtained, and then the continuously adjustable baseband signal is obtained. Design of baseband signal generation module. The baseband data is simulated by M sequence, then encoded by mapping, shaping filtering and variable interpolation. The shaping filter unit is designed by the method of parameter set, so that the type and parameters of the shaping filter can be dynamically configured, and the variable interpolation part is designed by the combination of half-band filter and CIC filter. Realize adjustable interpolation multiple. The design of upconversion part. It is mainly composed of digital orthogonal mixing and analog orthogonal mixing. The analog orthogonal mixing moves the baseband to the carrier frequency of the 100MHz~3GHz. In the design of two channels, the digital orthogonal mixing provides the appropriate frequency offset for the channel.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN911.3
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