Performance Analysis on Filter Parameters and Sub-bands Distribution of Universal Filtered Multi-Carrier

Abstract

With the development of 5G communication, the new non-orthogonal multi-carrier transmission technology has been paid more attention. A filtering operation is made on a group of continuous subcarriers in Universal-filtered multi-carrier (UFMC), making the orthogonality among the subcarriers no longer exist. Such feature has relaxed the strict constraint of synchronization between the various devices, and makes it more suitable for the needs of 5G. On the other hand, the non orthogonality causes the mutual interference among the subcarriers and sub-bands. If the interference is effectively reduced, the performance of UFMC can be improved. In this paper, the factor of true power ratio is proposed to evaluate the inter-band interference. Furthermore, with the specific filter parameters, an appropriate sub-band interval can reduce the energy interference between the sub-bands especially in the uplinks. Simulation result shows that the method can reduce the symbol error rate and improve the transmission performance of UFMC by deploying the sub-band with optimized interval. Especially in high SNR environment, the deployment of shorter filter and neighboring sub-bands shows a better performance.