Universal Filtered Multi-Carrier with Leakage-Based Filter Optimization
Universal Filtered Multi-Carrier (UFMC) is a novel modulation technique which can be seen as a generalization of filtered OFDM and Filterbank based multi-carrier (FBMCFMT). Being a candidate waveform technology for 5G wireless systems it combines the simplicity of OFDM with the advantages of FBMC. While previous work on UFMC was based on Dolph-Chebychev-filters, in this paper we now optimize the FIR filter design, using two different optimization criteria. The first criterion is the maximization of the signal over out-of-band leakage ratio. The second criterion uses signal over in-band distortion plus out-of-band leakage ratio. We compare UFMC based on filters with those two optimization approaches against UFMC with Dolph-Chebychev filters and against OFDM in a setting with non-perfect frequency alignment. The performance gains of the optimized filters are demonstrated in link level simulations.