Green Coexistence of CP-OFDM and UFMC Waveforms for 5G and Beyond Systems

Many waveforms have been suggested for the fifth generation of wireless communications (namely 5G) since the beginning of the work on it. After the Release-15 and Release16 frozen by the end of 2017 and 2019 respectively, the work has already began to suggest new waveforms that can solve the limitations in the 5G standard. Many researches have concluded that there is no (one-fits-all) waveform when it comes to the 5G standard operation scenarios (i.e. mMTC, eMBB, and URLLC). This fact urged many recent works to focus on coexistence of several candidate waveforms in an adaptive system that can switch quickly among these waveforms to achieve the different Key performance Indicators (KPI) for the different application scenarios. In this paper, we suggest a green coexistence of several waveform candidates of the 5G and the Kaiser-CP-OFDM from the 4G LTE and show in simulation the advantages of using such model. Kaiser windowing technique is added to the Universal Filtered Multi-Carrier (UFMC) to reduce the Out Of Band Emission (OOBE) and to enhance the Power Spectral Density (PSD) and it proves great advantages in coexistence of 4G LTE and 5G numerologies and waveforms.