Outage Probability versus Fairness Trade-off in Opportunistic Relay Selection with Outdated CSI

We analyze the existing trade-offs in terms of system performance versus fairness of a cooperative system based on opportunistic relay selection (ORS) and with outdated channel state information (CSI). In particular, system performance is analytically evaluated in terms of outage probability, and the fairness behavior is assessed based on the power consumption at the different relays. In order to improve the fairness behavior of ORS while keeping the selection diversity gain, we propose a relay selection mechanism where the relay with the highest normalized signal-to-noise ratio (SNR) is selected for relaying the source's information. The proposed strategy is compared with existing relay selection strategies by adopting a novel graphical representation inspired by expected profit versus risk plots used in modern portfolio theory. As shown in the paper, this strategy allows operating the system in more favorable points of the outage versus fairness region.

[1]  Zhigang Cao,et al.  Fair and Efficient Resource Allocation for Cooperative Diversity in Ad-Hoc Wireless Networks , 2007, 2007 IEEE Wireless Communications and Networking Conference.

[2]  Helmut Bölcskei,et al.  Fading relay channels: performance limits and space-time signal design , 2004, IEEE Journal on Selected Areas in Communications.

[3]  Jean-Claude Belfiore,et al.  Three scheduling schemes for amplify-and-forward relay environments , 2007, IEEE Communications Letters.

[4]  J. Nicholas Laneman,et al.  Cooperative diversity in wireless networks: algorithms and architectures , 2002 .

[5]  C.-C. Jay Kuo,et al.  Comparison of Power Control Schemes for Relay Sensor Networks , 2007, 2007 IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP '07.

[6]  Zhigang Cao,et al.  A Fair Multiuser Cooperation Protocol for Increasing the Throughput in Energy-Constrained Ad-hoc Networks , 2006, 2006 IEEE International Conference on Communications.

[7]  Carles Antón-Haro,et al.  A unified approach to the analytical assessment of multi-user diversity with imperfect channel state information: ergodic capacity and robustness analysis , 2007, Eur. Trans. Telecommun..

[8]  L.J. Cimini,et al.  Improved Fairness in Energy-Constrained Cooperative Ad-Hoc Networks , 2006, 2006 40th Annual Conference on Information Sciences and Systems.

[9]  Mohamed-Slim Alouini,et al.  Performance analysis of multiuser selection diversity , 2004, 2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577).

[10]  M. Ma,et al.  FOUNDATIONS OF PORTFOLIO THEORY , 1990 .

[11]  Umberto Spagnolini,et al.  Fair scheduling and orthogonal linear precoding/decoding in broadcast MIMO systems , 2005, 2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications.

[12]  George K. Karagiannidis,et al.  PHY-layer Fairness in Amplify and Forward Cooperative Diversity Systems , 2008, IEEE Transactions on Wireless Communications.

[13]  Aggelos Bletsas,et al.  A simple Cooperative diversity method based on network path selection , 2005, IEEE Journal on Selected Areas in Communications.

[14]  D. B. Calvo.  Fairness Analysis of Wireless Beamforming Schedulers , 2005 .

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

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

[17]  Abbas Jamalipour,et al.  Wireless communications , 2005, GLOBECOM '05. IEEE Global Telecommunications Conference, 2005..

[18]  Bin Zhao,et al.  Practical relay networks: a generalization of hybrid-ARQ , 2005, IEEE Journal on Selected Areas in Communications.

[19]  Mats Bengtsson,et al.  Beamforming and bit-loading strategies for multi-user SDMA with admission control , 2005, 2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications.

[20]  Jeffrey G. Andrews,et al.  Broadband wireless access with WiMax/802.16: current performance benchmarks and future potential , 2005, IEEE Communications Magazine.

[21]  Elza Erkip,et al.  User cooperation diversity. Part II. Implementation aspects and performance analysis , 2003, IEEE Trans. Commun..

[22]  Carles Antón-Haro,et al.  Analytical assessment of multi-user vs. spatial diversity trade-offs with delayed channel state information , 2006, IEEE Communications Letters.

[23]  Hyundong Shin,et al.  Cooperative Communications with Outage-Optimal Opportunistic Relaying , 2007, IEEE Transactions on Wireless Communications.

[24]  David Gesbert,et al.  From theory to practice: an overview of MIMO space-time coded wireless systems , 2003, IEEE J. Sel. Areas Commun..