A Reduced Complexity Transmitter for UF-OFDM

UF-OFDM is a promising 5G waveform candidate, close to CP-OFDM, but with better spectral properties. Efficient receiver implementations exist, which are close to CP-OFDM in terms of complexity. The UF-OFDM transmitter, on the other hand, still has no efficient solution in the literature up to now. This paper addresses this problem and presents a frequency domain generation method for UF-OFDM, related to the "overlap-add" method, known from digital signal processing. Our novel approach can bring down UF-OFDM complexity almost as low as a factor of 2 above CP-OFDM, with a negligible approximation error. Thus the required efficient transmitter implementation is delivered by this paper's solution.