Optimization of out-of-band emission using kaiser-bessel filter for UFMC in 5G cellular communications

Across the world, we are currently witnessing the deployments of 4G LTE-Advanced and the 5G research is reaching its peak point. The 5G research mainly concentrates on addressing some of the existing OFDM based LTE problems along with use of non-contiguous fragmented spectrum. Universal Filtered Multi Carrier (UFMC) has been considered as one of the candidate waveform for the 5G communications because it provides robustness against the Inter Symbol Interference (ISI), and Inter Carrier Interference (ICI) and is suitable for low latency scenarios. In this paper, a novel approach is proposed to use Kaiser-Bessel filter based pulse shaping instead of standard Dolph-Chebyshev filter for UFMC based waveform to reduce the spectral leakage into nearby sub-bands. In this paper, UFMC system is simulated using MATLAB software, a comparative study for Dolph-Chebyshev and Kaiser-Bessel filters are performed and the results are also presented in terms of power spectrum density (PSD) analysis, Complementary Cumulative Distribution Function (CCDF) analysis, and Adjacent Channel Power Ratio (ACPR) analysis. The simulated results show a better power spectral density and lower sidebands for UFMC (Kaiser Based window), when compared with UFMC (Dolph-Chebyshev) and conventional OFDM.