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Spectral Measurements

Channel power, bandwidth, mean frequency, median frequency, harmonic distortion

Use obw and powerbw to find the 90% occupied and 3-dB bandwidths of a signal. Compute the mean or median frequency of a power spectrum. Estimate the power over a given frequency band. Measure harmonic distortion.

Functions

bandpowerBand power
enbwEquivalent noise bandwidth
meanfreqMean frequency
medfreqMedian frequency
obwOccupied bandwidth
powerbwPower bandwidth
sfdrSpurious free dynamic range
sinadSignal to noise and distortion ratio
snrSignal-to-noise ratio
thdTotal harmonic distortion
toiThird-order intercept point

Topics

Measure the Power of a Signal

Estimate the width of the frequency band that contains most of the power of a signal. For distorted signals, determine the power stored in the fundamental and the harmonics.

Measure Total Harmonic Distortion

Measure the total harmonic distortion of a sinusoidal signal.

Analyzing Harmonic Distortion

Analyze the harmonic distortion of a weakly nonlinear system in the presence of noise.

Spurious-Free Dynamic Range (SFDR) Measurement

Measure the SFDR of a numerically controlled oscillator and explore the effects of adding phase dither.

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