Spectrum sensing using DFT filterbank

Dilip M Nair

2012 3 29

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"The concept of analysis filter bank is an array of bandpass filters as shown in Fig.2. Each bandpass filter is the frequency-shifted version of a lowpass filter H0(ω) with impulse response of h(n) with the length L which is called a prototype filter. The mathematical expression of m-th band of the filter bank is given by

hm(n) = h(n)W(−mn,M) (m = 0, 1, ...,M − 1)

where WM=e^(-j2*pi/M) and M is the number of sub bands."

I really dont understand how this equation is working or have a clue on how to implement this.

Can anyone please give me a piece of information, to start with !

just a start or an easier piece of information.

Thank You