304 Keysight N9915-90020 User’s Guide
IQ Analyzer (IQA) – Option 351
I/Q Analyzer (IQA) Mode Settings
— FFT Window Sets the FFT filtering window (spectrum analysis
window) shape for the I/Q data. Default: Flat Top
Then select one of the following:
FFT Window Description
Uniform No windowing
Triangular Barlett windowing
Hanning This is a Hann window, sometimes called Hanning or “raised
cosine”.
Hamming This window has lower side-lobe peaks than the Hann window,
but has worse main-lobe flatness and poor side-lobe roll-off.
Blackman This window is similar to the three-term Blackman-Harris
window, but it has simpler fixed-form coefficients and better
side-lobe roll-off.
Blackman Harris 3 This is the three-term Blackman-Harris window. This has the
minimum side-lobe level for a three-term cosine window.
Blackman Harris This is the four-term Blackman-Harris window. This has the
minimum side-lobe level for a four-term cosine window with
60 dB/decade roll-off.
Gaussian Top This is a five-term cosine window that resembles a Gaussian
window.
Flat 4 This is a four-term flat-top window.
Flat Top (default) This is the five-term flat-top window.
Flat 6 This is a six-term flat-top window.
Flat 7 This is a seven-term flat-top window.
P501 This is an alternative six-term flat-top window.
P601 This is an alternative seven-term flat-top window.
K-B (70 dB) This is a Kaiser-Bessel window whose maximum side-lobe
level is -70 dB.
K-B (80 dB) This is a Kaiser-Bessel window whose maximum side-lobe
level is -80 dB.
K-B (90 dB) This is a Kaiser-Bessel window whose maximum side-lobe
level is -90 dB.
K-B (100 dB) This is a Kaiser-Bessel window whose maximum side-lobe
level is -100 dB.
K-B (110 dB) This is a Kaiser-Bessel window whose maximum side-lobe
level is -110 dB.
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