Energy-Efficient Transmission Schemes in Cooperative Cellular Systems

Energy-efficient communication is an important requirement for mobile devices, as the battery technology has not kept up with the growing requirements stemming from ubiquitous multimedia applications. This paper considers energy-efficient transmission schemes in cooperative cellular systems with unbalanced traffic between uplink and downlink. Theoretically, we derive the optimal transmission data rate, which minimizes the total energy consumption of battery-powered terminals per information bit. The energy-efficient cooperation regions are then investigated to illustrate the effects of relay locations on the energy-efficiency of the systems, and the optimal relay location is found for maximum energy-efficiency. Finally, numerical results are provided to demonstrate the tradeoff between energy-efficiency and spectral efficiency.

[1]  Elza Erkip,et al.  User cooperation diversity. Part I. System description , 2003, IEEE Trans. Commun..

[2]  Aria Nosratinia,et al.  Spectrally-efficient relay selection with limited feedback , 2008, IEEE Journal on Selected Areas in Communications.

[3]  Stevan M. Berber,et al.  Energy-Efficiency of Cooperative Diversity Techniques in Wireless Sensor Networks , 2007, 2007 IEEE 18th International Symposium on Personal, Indoor and Mobile Radio Communications.

[4]  Andrea J. Goldsmith,et al.  Energy-constrained modulation optimization , 2005, IEEE Transactions on Wireless Communications.

[5]  Elza Erkip,et al.  Cooperative Regions and Partner Choice in Coded Cooperative Systems , 2006, IEEE Trans. Commun..

[6]  Luc Vandendorpe,et al.  Power Allocation for OFDM Transmission with DF Relaying , 2008, 2008 IEEE International Conference on Communications.

[7]  Geoffrey Ye Li,et al.  Energy Efficient Design in Wireless OFDMA , 2008, 2008 IEEE International Conference on Communications.

[8]  Hyun Seo Oh,et al.  Effect of relay locations in cooperative networks , 2009, 2009 1st International Conference on Wireless Communication, Vehicular Technology, Information Theory and Aerospace & Electronic Systems Technology.

[9]  Andrea J. Goldsmith,et al.  Energy-efficiency of MIMO and cooperative MIMO techniques in sensor networks , 2004, IEEE Journal on Selected Areas in Communications.

[10]  John G. Proakis,et al.  Digital Communications , 1983 .

[11]  Andrea J. Goldsmith,et al.  Variable-rate variable-power MQAM for fading channels , 1997, IEEE Trans. Commun..

[12]  Ying Wang,et al.  Joint Uplink and Downlink Relay Selection in Cooperative Cellular Networks , 2010, 2010 IEEE 72nd Vehicular Technology Conference - Fall.

[13]  Gregory W. Wornell,et al.  Cooperative diversity in wireless networks: Efficient protocols and outage behavior , 2004, IEEE Transactions on Information Theory.