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Polyphase FFT analysis filter bank

**Library:**DSP System Toolbox / Filtering / Multirate Filters

The Channelizer block separates a broadband input signal into multiple
narrow subbands using an FFT-based analysis filter bank. The filter bank uses a
prototype lowpass filter and is implemented using a polyphase structure. You can specify
the filter coefficients directly or through design parameters. When you specify the
design parameters, the filter is designed using the `designMultirateFIR`

function.

This block accepts variable-size inputs. That is, during the simulation, you can change the size of each input channel. The number of channels cannot change.

[1] Harris, Fredric J, *Multirate Signal Processing
for Communication Systems*, Prentice Hall PTR, 2004.

[2] Harris, F.J., Chris Dick, Michael Rice. "Digital Receivers and Transmitters
Using Polyphase Filter Banks for Wireless Communications." *IEEE ^{®} Transactions on microwave theory and techniques*. Vol. 51,
Number 4, April 2003.

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