DFT Leakage

Learn how frequency-domain sampling in a DFT leads to leakage in the spectrum.

The DFT frequency index kk represents the pointer to the real-world frequency of the signal. This has been established through the relation

k=Nffsk = N \frac{f}{f_s}

where NN is the DFT size and fsf_s is the sample rate. Since ff is a continuous variable (e.g., 1.5 GHz, 2.4 GHz), the frequency index kk can be an integer or a fractional number.

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