Proposta de Janela baseada na Distribuição de Nakagami para o Filtro FIR Utilizado na Tecnologia f-OFDM Candidata para Aplicações 5G

In the fourth generation of wireless (4G) mobile communications networks, the widely used multiplexing technology is OFDM. Although OFDM has many advantages, such as high robustness to inter-symbolic interference (ISI), the out-ofband emissions (OOBE) presented in this technology must be reduced so that the demands of the fifth generation of mobile wireless communications (5G) are met. To this end, technologies such as UFMC, FBMC and f-OFDM have been proposed in the literature. This work proposes a new window based on the Nakagami distribution for the FIR filter used in f-OFDM technology. The proposed window is adjustable and has the advantage of not having serial expansion in its time domain function (which is computationally more efficient) unlike some of the adjustable windows in the literature, such as: Dolph- Chebyshev and Kaiser. The results obtained through simulations show that the proposed window for the f-OFDM filter reduces out-of-band emission compared to the main window functions present in the literature and compared to OFDM, UFMC and FBMC technologies, which use of f-OFDM for 5G applications that require low tolerance to interference between subbands.