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Non-Uniform 2-Slot Constellations for Relaying in Butterfly Network with Imperfect Side Information

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2 Author(s)
Tomas Uricar ; Czech Technical University in Prague, Faculty of Electrical Engineering, Department of Radio Engineering ; Jan Sykora

There are two key aspects affecting the performance of butterfly network with wireless network-coded relaying. The first one is the amount of Complementary Side Information (C-SI) at destinations and the second is given by a parametric Multiple-Access channel performance of source constellation alphabets. In this paper we show that theNon-uniform 2-slot (NuT) constellations, proposed originally for bi-directional relaying in the 2-Way Relay Channel (2-WRC), are suitable also for the butterfly network, combining the favorable parametric channel performance with the potential to increase the reliability of required C-SI (necessary for successful decoding at the final destination). Possessing both these qualities, the NuT alphabets surpass again the conventional linear modulation schemes, extending further the scope of their potential application.

Published in:

IEEE Communications Letters  (Volume:16 ,  Issue: 9 )