Design and Analysis of Generalized Prototype Filter for ISI and ICI Minimization

Filter bank multicarrier (FBMC) is a modulation scheme which employs spectrally efficient prototype filters with fast side lobe roll-off. However, this typically comes at the cost of an increased intrinsic interference among neighbouring sub-carriers and requires complex signal processing for demodulation at the receiver. In this work, we present a generalized approach to design a prototype filter based on frequency sampling technique and minimization of intrinsic interference that arises because of the presence of inter-symbol interference (ISI) and inter-carrier interference (ICI) in a FBMC system. The approach proposed in this work can be used to design prototype filters for any given spectral efficiency. The frequency magnitude spectrum of the proposed filter is compared with that of existing filters in literature. We also examine how altering the number of sub-carriers affects the frequency magnitude response of the prototype filter.