An Efficient Weighted Overlap-add Structure for Wideband Frequency Spectrum Analysis with Narrow Resolution Bandwidth

Wideband spectrum analysis requires high sampling rates, leading to huge data computations for narrow resolution bandwidth (RBW) analysis. This paper presents a weighted overlap-add (WOLA) structure to reduce this complexity of implementation. And WOLA structure has lower computational complexity and better time-frequency resolution than existing efficient structures using the variable bandwidth filter (VBF) or the alternate masking scheme (AMS). When applied to an 8GHz spectrum analysis, the WOLA structure could achieve an instantaneous dynamic range (IDR) of 90dB and an RBW of 229kHz in the numerical simulation.