Title :
Denoising Maps and Constellations for Wireless Network Coding in Two-Way Relaying Systems
Author :
Koike-Akino, Toshiaki ; Popovski, Petar ; Tarokh, Vahid
Author_Institution :
Sch. of Eng. & Appl. Sci., Harvard Univ., Cambridge, MA
Abstract :
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.
Keywords :
Nakagami channels; encoding; quadrature phase shift keying; radio networks; Nakagami-Rice fading channels; QPSK constellation; broadcast stage; denoise-and-forward; denoising maps; end-to-end throughput; modulation schemes; modulation-related problems; multiple access stage; two-way relaying systems; wireless network coding; Broadcasting; Fading; Modulation coding; Network coding; Noise reduction; Physical layer; Quadrature phase shift keying; Relays; Throughput; Wireless networks;
Conference_Titel :
Global Telecommunications Conference, 2008. IEEE GLOBECOM 2008. IEEE
Conference_Location :
New Orleans, LO
Print_ISBN :
978-1-4244-2324-8
DOI :
10.1109/GLOCOM.2008.ECP.727
