DFT Filter Banks. Steven Liddell Prof. Justin Jonas. Channelization. A common task in radio astronomy is the channelization of a signal onto separate frequency channels. The output signal has a decreased bandwidth so the output sample rate can be decrease multirate systems.
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DFT Filter Banks
Prof. Justin Jonas
≈N/2 log2(M) MACs
M × N MACs
Weighted Overlap Add Filter Bank
Polyphase Filter Bank
Polyphase filters (pρ(n))
Prototype filter copied onto each channel.
(output data rate 1/16 input data rate)
(output data rate >1/16 input data rate)
Fixed point error in the filter coefficients change the channels’ frequency response.