Abstract: Filter bank OFDM technology may be one of the best technology schemes for 5G transmission system to achieve its basic application standards such as high speed, high throughput, high reliability and low delay. In the filter bank OFDM system, besides the integrated filter banks at the transmitter and the analysis filter banks at the receiver, the other architectures are basically the same as the 4GLTE, and the technical implementation is relatively difficult. In this paper, the energy leakage of waveforms generated by traditional window functions and filter banks in frequency domain is analyzed by using Fourier time-frequency transform and simulation modeling as close as possible to the reality. The performance of filter banks OFDM system is discussed by analyzing the bit curve of filter banks OFDM system. Learn and understand basic technology such as 5G system to help.

Key words: filter banks, stacking factors, waveform forming and energy leakage