Design of Optimal Short OFDM-Type Windows

One key issue of the fifth mobile communication generation (5G) is to elaborate an appropriate new waveform. Ideally, this waveform should preserve the two main advantages of the Orthogonal Frequency Division Multiplexing (OFDM) scheme, namely low latency and complexity. Along that line of thought, we propose in this paper an OFDM-type window, i.e. identical symbol time duration and equivalent spectral efficiency as OFDM. This optimal waveform with respect to the time-frequency lo-calization criterion is analyzed using a Filtered MultiTone (FMT) framework. Our design examples illustrate its huge benefits compared to OFDM and we also compare its behavior with respect to the Root Raised Cosine window