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Denoising Maps and Constellations for Wireless Network Coding in Two-Way Relaying Systems

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3 Author(s)
Koike-Akino, T. ; Sch. of Eng. & Appl. Sci., Harvard Univ., Cambridge, MA ; Popovski, P. ; Tarokh, Vahid

We investigate on the design of modulation schemes suited for two-way wireless relaying systems that apply network coding at the physical layer. We consider network coding based on denoise-and-forward (DNF), which consists of two stages: multiple access (MA) stage and broadcast (BC) stage. For the case of QPSK constellation in the MA stage, we introduce the modulation-related problems in DNF. We propose two approaches to solve those issues. One uses only QPSK constellations at the BC stage. The other allows the use of unconventional 5-ary modulations, optimized according to the channel condition. The performance evaluation shows that a significant improvement in end-to-end throughput can be achieved, in particular for Nakagami-Rice fading channels.

Published in:

Global Telecommunications Conference, 2008. IEEE GLOBECOM 2008. IEEE

Date of Conference:

Nov. 30 2008-Dec. 4 2008