Can anyone recommend simulation methods of paraunitary filter banks?

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Amit Manocha

Try Wavelet transform filters..........

Dmitry I Kaplun

Read articles:

Parfieniuk M.,Petrovsky A. Quaternionic building block for paraunitary filter banks // The proc. of the XII European Signal Processing conference, EUSIPCO-2004, Sept. 6-10, 2004, Vienna, Austria. – pp.1237-1240

Parfieniuk M., Petrovsky A. Inherently lossless structures for eight- and six-channel linear-phase paraunitary filter banks based on quaternion multipliers, Signal Process., Vol.90, 2010. – pp.1755-1767

I think that you'll find something useful.