Simulación de la técnica de modulación UFMC para un canal multitrayecto y usando estimación de canal

Abstract

UFMC (Universal Filtered Multi-Carrier) is a novel multi-carrier modulation technique that aims to replace the OFDM (Orthogonal Frequency Division Multiplexing) modulation technique for fifth generation (5G) wireless communication systems. UFMC, being a generalization of OFDM and FBMC (Filter Bank Multicarrier), combines the advantages of these systems and at the same time avoids their main disadvantages. The article demonstrates that, through a filter operation to a group of consecutive subcarriers (sub-band), UFMC reduces the levels of out-of-band side-lobes produced in the PSD (Power Spectral Density) of the processed signal and subsequently significantly minimizes inter-carrier (ICI) and inter-symbol (ISI) interference presented in OFDM systems. The study and analysis of the performance of the UFMC system in terms of PSD, BER (Bit Error Rate) and MSE (Mean Square Error) are presented. In addition, the ability of UFMC to overcome the fading effects of multipath channels and to provide good and reliable performance levels without using the cyclical prefix (CP) concept is investigated. Finally, it is shown that the pilot-assisted channel estimation method applied in OFDM systems can also be applied in UFMC systems.