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 multi-carrier modulator, on the other hand, still has no efficient solution in the literature up to now. This paper addresses this problem and presents a novel frequency domain generation method for UF-OFDM, where overlapping subbands are superimposed. Our approach can bring down UF-OFDM multi-carrier modulator 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, ready to be used in hardware implementations.

[1]  Gerhard Fettweis,et al.  GFDM - Generalized Frequency Division Multiplexing , 2009, VTC Spring 2009 - IEEE 69th Vehicular Technology Conference.

[2]  Frank Schaich,et al.  5GNOW: non-orthogonal, asynchronous waveforms for future mobile applications , 2014, IEEE Communications Magazine.

[3]  Frank Schaich,et al.  Universal Filtered Multi-Carrier with Leakage-Based Filter Optimization , 2014 .

[4]  Steven G. Johnson,et al.  A Modified Split-Radix FFT With Fewer Arithmetic Operations , 2007, IEEE Transactions on Signal Processing.

[5]  Frank Schaich,et al.  Relaxed synchronization support of universal filtered multi-carrier including autonomous timing advance , 2014, 2014 11th International Symposium on Wireless Communications Systems (ISWCS).

[6]  Frank Schaich,et al.  Waveform Contenders for 5G - Suitability for Short Packet and Low Latency Transmissions , 2014, 2014 IEEE 79th Vehicular Technology Conference (VTC Spring).

[7]  Behrouz Farhang-Boroujeny,et al.  OFDM Versus Filter Bank Multicarrier , 2011, IEEE Signal Processing Magazine.

[8]  Frank Schaich,et al.  Multiple Access and Waveforms for 5G: IDMA and Universal Filtered Multi-Carrier , 2014, 2014 IEEE 79th Vehicular Technology Conference (VTC Spring).

[9]  Frank Schaich,et al.  5G air interface design based on Universal Filtered (UF-)OFDM , 2014, 2014 19th International Conference on Digital Signal Processing.