Title :
Superposition coding for wireless Butterfly Network with partial Network Side-Information
Author :
Uricar, T. ; Sykora, J. ; Bin Qian ; Wai Ho Mow
Author_Institution :
Czech Tech. Univ. in Prague, Prague, Czech Republic
Abstract :
Although the 2-source wireless Butterfly Network (BN) represents a natural extension of the well-known 2-Way Relay Channel (2-WRC) scenario, a direct implementation of conventional Wireless Network Coding (WNC)/Physical Layer Network Coding (PLNC) principles in this network is not straightforward. While the information necessary for decoding of the desired data from WNC-coded data at each destination is naturally available in 2-WRC, in the BN the destinations can obtain such information only by overhearing the wireless transmission from the unintended source. Since the amount of such received “Network” Side-Information (N-SI) would be limited by the quality of the corresponding source-destination link, the assumption of perfect side-information is no longer valid in BN, rising many novel research challenges for the design of WNC-based BN. In this paper we propose the Superposition Coding (SC) based scheme as a feasible strategy for relaying in BN. We will show that by a proper optimization of its parameters (rates & power allocation of underlying SC messages), SC is able to achieve the upper bound of two-way rate in BN for both the zero and perfect N-SI case and moreover, it represents a viable solution even for the case where only partial N-SI is available at both destinations.
Keywords :
hypercube networks; network coding; relay networks (telecommunication); 2-WRC; 2-way relay channel; BN; N-SI; PLNC; SC; WNC coded data; network side information; partial network side information; physical layer network coding; source destination link; superposition coding; wireless butterfly network; wireless network coding; wireless transmission; Decoding; Network coding; Optimization; Relays; Signal to noise ratio; Silicon; Wireless communication;
Conference_Titel :
Wireless Communications and Networking Conference Workshops (WCNCW), 2013 IEEE
Conference_Location :
Shanghai
Print_ISBN :
978-1-4799-0109-8
Electronic_ISBN :
978-1-4799-0108-1
DOI :
10.1109/WCNCW.2013.6533331