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

fYear

2008

Firstpage

1

Lastpage

6

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 2008. IEEE GLOBECOM 2008. IEEE

Conference_Location

New Orleans, LO

ISSN

1930-529X

Print_ISBN

978-1-4244-2324-8

Type

conf

DOI

10.1109/GLOCOM.2008.ECP.725

Filename

4698500