Subband frequency-domain filtering for filtered OFDM

The fifth generation (5G) cellular network is mainly used to meet the needs of mobile communication after 2020. Orthogonal Frequency Division Multiplexing (OFDM) is widely used in existing wireless communication systems, and filtered orthogonal frequency division multiplexing has been proposed. (F-OFDM) as a new waveform that meets the requirements of the fifth generation cellular network. High-order subband filters are commonly used in F-OFDM systems, which results in high computational complexity when filtering is performed in the time domain. Therefore, a frequency domain filtering method based on overlapping preservation method is proposed to reduce the high computational complexity of time domain filtering caused by high-order subband filters in F-OFDM. The complexity analysis and simulation results show that the proposed low complexity filtering scheme can significantly reduce the computational complexity while achieving similar bit error rate performance compared to traditional OFDM and FOFDM systems using time domain filtering.