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In this paper we consider multi-user multicarrier transmissions with flexible subcarrier spacings. In a scenario of multiple users access with different subcarrier spacings the orthogonality between subcarriers is disrupted. The paper presents the Intercarrier Interference (ICI) that occurs between two users with different subcarrier spacings in a Universal Filtered Multicarrier (UFMC) system. We investigate the interference induced by one user to another. We propose closed form functions for ICI for both users and validate them with simulation results. Also, we provide simulation results of the ICI power in terms of filter lengths and number of guard subcarriers and we calculate the corresponding achieved time-frequency efficiencies.
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Marijanović et al. (2017) studied this question.