Title :
Joint Network Coding and Superposition Coding for Multi-User Information Exchange in Wireless Relaying Networks
Author :
Liu, Chun-Hung ; Arapostathis, Ari
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Texas at Austin, Austin, TX
Abstract :
A joint network coding and superposition coding (JNSC) scheme is proposed for information exchange between more than two users in a wireless relaying network. In this paper we consider two scenarios in a relaying network with four nodes: single and multiple information exchange loops between three source nodes, and two alternative transmission schemes, i.e. pure time division (PTD) and pure network coding (PNC), are also considered in order to compare with JNSC. The achievable rate regions of the PTD, PNC and JNSC schemes are all characterized, indicating the JNSC scheme is not always superior to the other two schemes. The sum rate optimization problem with a certain traffic pattern is also solved. We showed that the maximum coding gains of the JNSC and PNC schemes compared with the PTD scheme is achieved as the transmission rate of each node is one third of the sum rate in the network. Simulation results also reveal this phenomenon.
Keywords :
channel coding; multiuser channels; radio networks; information exchange loops; joint network coding-superposition coding scheme; multiuser information exchange; pure network coding; pure time division; sum rate optimization problem; traffic pattern; wireless relaying networks; Broadcasting; Context; Decoding; Network coding; Relays; Telecommunication traffic; Throughput; Traffic control; Wireless communication; 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.725
