Dual constellation diversity-enhanced modulation for network-coded bidirectional relaying in an asymmetric channel
- Resource Type
- Conference
- Authors
- Ryu, Hyun-Seok; Kang, Chung G.
- Source
- 2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications Personal, Indoor and Mobile Radio Communications, 2009 IEEE 20th International Symposium on. :2375-2379 Sep, 2009
- Subject
- Communication, Networking and Broadcast Technologies
Fields, Waves and Electromagnetics
Relays
Bidirectional control
Constellation diagram
Degradation
Signal to noise ratio
Diversity methods
Performance gain
Protection
Bit error rate
Telecommunication traffic
- Language
- ISSN
- 2166-9570
2166-9589
In this paper, we consider a modulation scheme for a network-coded bi-directional relaying (CBR) scheme in which two different signals from mutually communicating nodes are network-coded in the relay node. It employs dual constellations as a useful means of dealing with its performance degradation in the CBR over asymmetric channel (i.e., the different signal-to-noise ratio in each link), which provide not only a diversity gain from the symbol repetition but also a coding gain from the constellation rearrangement to protect the network-coded symbols. We study the channel utilization and bit error rate performance of the different CBR schemes to show that the proposed diversity-enhanced CBR system always outperforms other existing systems as long as traffic load is properly balanced along the bi-directional links.