Description: The Hilbert Transform is an important component in communication systems, e.g. for single sideband modulation/demodulation, amplitude and phase detection, etc. It can be formulated as filtering operation which makes it possible to approximate the Hilbert Transform with a digital filter. Due to the non-causal and infinite impulse response of that filter, it is not that easy to get a good approximation with low hardware resource usage. Therefore, different filters with different complexities have been implemented.
The detailed discussion can be found in "Digital Hilbert Transformers or FPGA-based Phase-Locked Loops" (http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4629940).
The design is fully pipelined for maximum throughput. Platform: |
Size: 1239040 |
Author:Arun |
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Description: 频谱分析仪是信号处理研究领域必不可少的工具。现有的基于快速傅利叶变换的频
谱分析仪能对线性的平稳的信号进行有效分析，但难以分析出非线性非平稳信号的瞬时频率
能量变化情况。针对此问题，本文设计了基于希尔伯特黄变换的频谱分析仪，能够对非平稳
信号进行有效分析。所设计系统以DE2-FPGA开发板为硬件平台，结合了NiosII的软核处
理器加以实现，可对采集的外部信号进行希尔伯特黄变换，得到信号的时间-频率-能量三维
谱，并可在VGA上实时显示出来。系统测试结果表明，所设计频谱分析仪对非线性非稳定
信号有很好的效果，与Matlab处理结果保持一致，有效弥补了传统信号分析仪的不足。-Spectrum analyzer is an essential signal processing research tool. Existing analysis can effectively smooth linear signal spectrum analyzer based fast Fourier transform, but it is difficult to analyze the nonlinear and non-stationary signal instantaneous frequency energy changes. To solve this problem, we design a spectrum analyzer based on Hilbert Huang Transform, able to carry out effective analysis of non-stationary signals. The design of the system to DE2-FPGA development board as the hardware platform, combined with the soft-core processor NiosII be achieved, the external signal acquisition can be Hilbert Huang transform, time signal- Frequency- dimensional energy spectrum, and can be displayed in real time on the VGA. System test results show that the design spectrum analyzer nonlinear non-stationary signals have very good results, consistent with the Matlab results, effectively compensate for the shortcomings of traditional signal analyzers. Platform: |
Size: 419840 |
Author:张春竹 |
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