A multi-resolution digital filter bank for spectrum sensing in military radio receivers

In this paper, we propose a multi-resolution filter bank (MRFB) based on the fast filter bank design for variable resolution spectrum sensing in military radio receivers. The proposed method overcomes the constraint of fixed sensing resolution in spectrum sensors based on conventional uniform discrete Fourier transform filter banks (DFTFB). MRFB based spectrum sensor can adapt to different detection bandwidths for wideband spectrum sensing in military radios. The flexibility in realizing variable sensing resolution spectrum sensor is achieved by suitably designing the prototype filter and efficiently selecting the varying resolution channels without hardware re-implementation. Design examples show that the detection performance of proposed MRFB is comparable to that of conventional fixed resolution DFTFB based spectrum sensor. The complexity comparison shows that the proposed MRFB architecture is 50.5% less complex than that of DFTFBs.