Novel Methods of Filtering For FBMC/UFMC Based 5G Communication Systems

Abstract

It is expected that the 5G wireless technologies will come into effect by the year 2020. New Radio (NR) techniques will be implemented in 5G in order to overcome the limitations of OFDM based 4G/LTE. Two popular NR techniques are Filter Bank Multi Carrier (FBMC) and Universal Filtered Multi-carrier (UFMC) which are proposed for 5G. Both FBMC and UFMC have some merits as well as demerits. FBMC uses Filtering technique on each sub-carrier of OFDM. On the other hand UFMC decomposes the allotted band into sub-bands and applies the Filtering technique on each subband. This paper describes FBMC and UFMC for 5G which implement two different Prototype Filters. One of them is Binomial Filter for FBMC and the other one is Fractional-Powered Binomial Filter (FPBF) for UFMC. It was found that the Binomial Filter based FBMC can reduce the PAPR when the simulation results were compared with another popular Prototype Filter. PAPR reduction was about 0.81 dB in case of Binomial Filter based FBMC and at 256-QAM level. In the second case, sub-band interference of FPBF based UFMC was about 58 dB less than that of 60 dB Dolph-Chebyshev Filter based UFMC. PAPR was also minimum in case of FPBF based UFMC.