Hierarchically Modulated Network Coding for Asymmetric Two-Way Relay Systems

Author

Park, Jung Min ; Kim, Seong-Lyun ; Choi, Jinho

Author_Institution

Dept. of Electr. & Electron. Eng., Yonsei Univ., Seoul, South Korea

Volume

59

Issue

5

fYear

2010

fDate

6/1/2010 12:00:00 AM

Firstpage

2179

Lastpage

2184

Abstract

Network coding has been known as a spectrally efficient technique in wireless networks. However, when it is applied to a two-way relay channel (TWRC), it suffers from performance degradation caused by the asymmetric position of the relay. In this paper, we suggest remedying this problem by using hierarchical modulation at the source node. We investigate how hierarchical modulation can be incorporated and optimized with network coding. Our results are encouraging in that hierarchically modulated network coding (HMNC) significantly improves end-to-end bit-error probability and spectral efficiency in asymmetric relay channels, as compared with direct transmission (DT), bidirectional network coding (BNC), and coded bidirectional relay (CBR).

Keywords

error statistics; modulation coding; network coding; radio networks; asymmetric relay channels; asymmetric two-way relay channel systems; bidirectional network coding; coded bidirectional relay; end-to-end bit-error probability; hierarchical modulation; hierarchically modulated network coding; source node; spectral efficiency; wireless networks; Hierarchical modulation; network coding; superposition coding; two-way relay channel (TWRC);

fLanguage

English

Journal_Title

Vehicular Technology, IEEE Transactions on

Publisher

ieee

ISSN

0018-9545

Type

jour

DOI

10.1109/TVT.2010.2045521

Filename

5430953