Hierarchically Modulated Network Coding for Asymmetric Two-Way Relay Systems

作     者：Park, Jung Min Kim, Seong-Lyun Choi, Jinho 

作者机构：Yonsei Univ Dept Elect & Elect Engn Radio Resource Management & Optimizat Lab Seoul 120749 South Korea Swansea Univ Sch Engn Swansea SA2 8PP W Glam Wales 

出 版 物：《IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY》 (IEEE Trans. Veh. Technol.)

年 卷 期：2010年第59卷第5期

页      面：2179-2184页

核心收录：

学科分类：0810[工学-信息与通信工程] 0808[工学-电气工程] 08[工学] 0823[工学-交通运输工程] 

基　　金：Ministry of Knowledge Economy  Korea 

主　　题：Hierarchical modulation network coding superposition coding two-way relay channel (TWRC) 

摘      要：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).