ABSTRACT
Fourth-generation (4G) communication systems are designed to provide very high data rate connections to users. The next generation wireless wireless communication technologies have to serve new application scenarios such as machine type communication, cognitive radio, great service in crowd, tactile Internet, etc., which have a wide variety of different requirements, than 4G, to be met. Orthogonal frequency division multiplexing (OFDM) is an advanced form of frequency division multiplexing where the frequencies multiplexed are orthogonal to each other and their spectra overlap with the neighboring carriers. OFDM with different numerology has been accepted as 5G waveforms by 3GPP. Use of different subcarrier bandwidths for OFDM was first proposed in 2005. The OFDM signal produces large side lobes in the spectrum due to the rectangular pulse shape in the time domain signal.
