Open AccessReal-time OFDM or Nyquist pulse generation – which performs better with limited resources?
Author(s) -
R. Schmogrow,
Rachid Bouziane,
Matthias Meyer,
Peter Milder,
Philipp Schindler,
Robert I. Killey,
Polina Bayvel,
C. Koos,
W. Freude,
Juerg Leuthold
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.00b543
Subject(s) - computer science , orthogonal frequency division multiplexing , electronic engineering , multiplexing , digital signal processing , nyquist–shannon sampling theorem , pulse shaping , spectral efficiency , channel (broadcasting) , optics , computer hardware , telecommunications , physics , engineering , laser
We investigate the performance and DSP resource requirements of digitally generated OFDM and sinc-shaped Nyquist pulses. The two multiplexing techniques are of interest as they offer highest spectral efficiency. The comparison aims at determining which technology performs better with limited processing capacities of state-of-the-art FPGAs. It is shown that a novel Nyquist pulse shaping technique, based on look-up tables requires lower resource count than equivalent IFFT-based OFDM signal generation while achieving similar performance with low inter-channel guard-bands in ultra-dense WDM. Our findings are based on a resource assessment of selected DSP implementations in terms of both simulations and experimental validations. The experiments were performed with real-time software-defined transmitters using a single or three optical carriers.