Faster-than-Nyquist: Theory and Potential Applicability to Coherent Optical Communications

Monday, 19 September, 2011
14:30 – 16:15, Room B
Mo.1.B • Spectral Efficiency And Quantum Effects


Mo.1.B.1 • 14:30 (Tutorial)

FASTER-THAN-NYQUIST AND BEYOND: HOW TO IMPROVE SPECTRAL EFFICIENCY BY ACCEPTING INTERFERENCE

Giulio Colavolpe1; 1Information Engineering, University of Parma, Italy.
Shannon theory explains that orthogonal signaling with Gaussian inputs achieves capacity on the bandlimited AWGN channel. Hence, for many years, communication systems for quasi-static channels have been designed based on orthogonal signaling. However, when low-order constellations are used, performance can be considerably improved by giving up the orthogonality, thus accepting interference. Faster-than-Nyquist signaling is an example of this paradigm. We describe a new information-theoretic approach to the more general technique of time-frequency packing and we show how it translates into practical design rules.

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