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Line 19: ==== Signal spectrum from FFT ==== {{main\|Fast Fourier transform}} A [[fast ~~fourier~~Fourier transform\|FFT]] is used to compute the frequency spectrum of the signal. Usually there is a [[window function\|windowing function]] option to limit [[spectral leakage]] and enhance frequency resolution.<ref>Keysight [https://stgwww.keysight.com/cn/zh/assets/7018-02679/technical-overviews/5990-6405.pdf], ''Keysight Vector Signal Analysis Basics'', Published September 30, 2019.</ref> This window is implemented by multiplying it with the digitized values of the sample period before computing the FFT. ==== Constellation diagram ====

Vector signal analyzer: Difference between revisions