Coexistence of Systems with Different Multicarrier Waveforms in LSA Communications

Mirza Golam Kibria, Gabriel Porto Villardi, Kentaro Ishizu, Fumihide Kojima

We study the coexistence of different multicarrier waveforms such as orthogonal frequency division multiplexing (OFDM), filter-bank multicarrier (FBMC) and universal-filtered multicarrier (UFMC) waveforms in licensed shared access (LSA) for next-generation communication systems. The fundamental changes required in the existing physical layer using OFDM towards a hybrid physical layer (either OFDM-FBMC or OFDM- UFMC) ensuring backward compatibility are discussed. We also perform mutual interference analysis for the coexisting asynchronous systems sharing the LSA frequency band. Be- cause of the non-orthogonality between their respective transmit signals, power is spilled from a system to the other causing interference. In consideration of analyzing this interaction, power spectral densities of the multicarrier waveforms are exploited. We quantify the amount of percentage power-loss experienced by the interfering systems for not fully exploiting their available power budgets. The simulation results reveal that the interfering system with FBMC suffers the least percentage power-power loss due to its very low side-lobes while conventional OFDM-based system suffers the most. The UFMC-based system exhibits intermediary performance with respect to achieved throughput and power-loss when compared with OFDM and FBMC-based systems.

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