基于CycloneⅡ的FPGA的复杂调制信号源的设计与实现

发布时间：2018-01-15 05:17

本文关键词：基于CycloneⅡ的FPGA的复杂调制信号源的设计与实现　出处：《兰州交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：在日趋发达的无线通信技术中，，通信的安全与可靠也越来越成为人们关注的焦点。无线通信压制系统的研发为信息安全的传递提供了有力保障。而通信压制系统中能够产生带宽可调、性能更好噪声调频压制信号则是重中之重，因此对无线通信压制系统专用调制信号源的开发与研制就显得格外紧迫。本论文来源于无线通信压制系统项目，针对基于Cyclone II的FPGA的复杂调制信号源的设计与实现进行研究。提出了一种基于FPGA+QDUC硬件平台的系统构架，运用信号调制与信号处理算法，通过直接数字频率合成技术实现的复杂调制信号源系统设计方案。首先，本文介绍了系统设计的相关理论基础：软件无线电理论及设计思想、频率合成技术、信号调制算法。其次，对CORDIC算法与DA算法的基本原理进行了阐述。再次，对基于Cyclone II的FPGA的复杂调制信号源的整体设计方案、系统核心模块的设计方案以及核心芯片的功能特性进行重点阐述。接着，从系统的可靠与稳定性出发，提出低成本、低功耗的解决方案，运用时分复用思想实现多信号的时分输出。系统设计采用了模块化思想，各个模块实现相应的功能，由主控芯片FPGA对其进行时序与逻辑控制，在FPGA中实现了对数字正交上变频芯片的控制、信号存储模块芯片的控制以及单频信号的生成，AM、FM等模拟调制方式的实现，2ASK、GMSK等数字调制方式的实现。最后，整合系统需求进行了硬件与软件的设计调试，并对复杂调制信号源实际产生的信号进行了验证，并提出进一步完善系统的方法。本设计产生的调制信号经过实际测试与检验，拥有较好杂散抑制特性和很高的频率精度，运用到无线通信压制系统中达到了预期的目标与效果，满足了系统对中频调制信号精度的要求。
[Abstract]:In the increasingly developed wireless communication technology. The research and development of wireless communication suppression system provides a powerful guarantee for the transmission of information security, and the bandwidth can be adjusted in the communication suppression system. Better performance of noise FM suppression signal is the most important, so the development and development of special modulation signal source for wireless communication suppression system is particularly urgent. This paper comes from the wireless communication suppression system project. The design and implementation of complex modulation signal source based on FPGA based on Cyclone II is studied. A system architecture based on FPGA QDUC hardware platform is proposed. Using signal modulation and signal processing algorithm, the design scheme of complex modulation signal source system is realized by direct digital frequency synthesis technology. First of all. This paper introduces the theoretical basis of the system design: software radio theory and design ideas, frequency synthesis technology, signal modulation algorithm. Secondly. The basic principles of CORDIC algorithm and DA algorithm are described. Thirdly, the design of complex modulation signal source based on Cyclone II FPGA is presented. The design of the system core module and the functional characteristics of the core chip are described. Then, from the system reliability and stability, a low cost and low power solution is proposed. Time division multiplexing is used to realize the multi-signal time division output. The system design adopts the modularization idea, each module realizes the corresponding function, the main control chip FPGA carries on the timing and the logic control to it. The control of digital quadrature up-conversion chip, the control of signal storage module and the realization of analog modulation such as single frequency signal generation are realized in FPGA. Finally, the hardware and software of the integrated system are designed and debugged, and the signal generated by the complex modulation signal source is verified. The method of further perfecting the system is put forward. The modulation signal produced by this design has good spurious suppression characteristics and high frequency precision after actual test and verification. It is applied to wireless communication suppression system to achieve the desired goal and effect. The system meets the requirement of if modulation signal precision.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN911.3

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