Multi-User Precoding and Energy-Efficient Relaying Scheme in Multi-Relay Systems

The multi-user multi-relay system is investigated in this paper. Multi-user precoding is utilized at the source node to mitigate the interference among data streams. Since the transmitting power of relay nodes is constrained independently, the interference among data streams can not be completely mitigated at the destination nodes. An energy-efficient relaying scheme is proposed at relay nodes to mitigate the inter-stream interference and save the transmitting power of relay nodes. The average saved transmitting power is derived from simple system parameters. Simulation results demonstrate that the energy-efficient relaying scheme outperforms the conventional simple relaying scheme on the system capacity, reliability performance and the transmitting power of relay nodes.

[1]  Yan Zhang,et al.  Energy-Efficient Cross-Layer Protocol of Channel-Aware Geographic-Informed Forwarding in Wireless Sensor Networks , 2009, IEEE Transactions on Vehicular Technology.

[2]  Wenjun Li,et al.  Energy Efficient Distributed Detection via Multi-Hop Transmission in Sensor Networks , 2006, MILCOM 2006 - 2006 IEEE Military Communications conference.

[3]  A. Wittneben,et al.  Distributed antenna systems and linear relaying for gigabit MIMO wireless , 2004, IEEE 60th Vehicular Technology Conference, 2004. VTC2004-Fall. 2004.

[4]  Yi Zheng,et al.  Downlink Distributed Beamforming through Relay Networks , 2009, GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference.

[5]  Andreas F. Molisch,et al.  Cooperative Relaying with Imperfect Channel State Information , 2008, IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference.

[6]  Andreas F. Molisch,et al.  Asymmetric cooperation among wireless relays with linear precoding , 2008, IEEE Transactions on Wireless Communications.

[7]  Wenbo Wang,et al.  Successive Phase Sharing and Distributed Multiuser Precoding in Multirelay Systems , 2010, IEEE Signal Processing Letters.

[8]  J.M.H. Elmirghani,et al.  Green information and communication technology: energy efficiency in a motorway model , 2010, IET Commun..

[9]  Gerhard Bauch,et al.  Cooperative Transmission Schemes for Decode-and-Forward Relaying , 2007, 2007 IEEE 18th International Symposium on Personal, Indoor and Mobile Radio Communications.

[10]  Anant Sahai,et al.  Green codes: Energy-efficient short-range communication , 2008, 2008 IEEE International Symposium on Information Theory.

[11]  Wen J. Li,et al.  Energy-Efficient Distributed Detection Via Multihop Transmission in Sensor Networks , 2008, IEEE Signal Processing Letters.

[12]  Ha H. Nguyen,et al.  Distributed Beamforming in Multiuser Multi-Relay Networks with Guaranteed QoS , 2009, GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference.