Abstract

Conventional filter bank based spectrum sensing methods employ uniform Discrete Fourier Transform Filter
Bank (DFTFB). But the complexity with this is very high and the structure is inefficient since it remains idle
for most of the time. This paper proposes a time efficient DFTFB employing Polyphase decomposition for each
of filters in the DFT filter bank. Proposed structure also provides a tight control over per-channel frequency
response which is critical for many of applications to achieve the specified level of performance.
Keywords—DFT filter bank, polyphase, DFTFB, DFT, polyphase filter bank