Weitere Artikel dieser Ausgabe durch Wischen aufrufen
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of system performance versus fairness of a cooperative system based on opportunistic relay selection (ORS) and with outdated channel state information (CSI).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.
Sendonaris A, Erkip E, Aazhang B: User cooperation diversity—part I: system description. IEEE Transactions on Communications 2003, 51(11):1927-1938. 10.1109/TCOMM.2003.818096 CrossRef
Sendonaris A, Erkip E, Aazhang B: User cooperation diversity—part II: implementation aspects and performance analysis. IEEE Transactions on Communications 2003, 51(11):1939-1948. 10.1109/TCOMM.2003.819238 CrossRef
Nabar RU, Bölcskei H, Kneubühler FW: Fading relay channels: performance limits and space-time signal design. IEEE Journal on Selected Areas in Communications 2004, 22(6):1099-1109. 10.1109/JSAC.2004.830922 CrossRef
Gesbert D, Shafi M, Shiu D-S, Smith PJ, Naguib A: From theory to practice: an overview of MIMO space-time coded wireless systems. IEEE Journal on Selected Areas in Communications 2003, 21(3):281-302. 10.1109/JSAC.2003.809458 CrossRef
IEEE 802.16's Relay Task Group http://wirelessman.org/relay
Ghosh A, Wolter DR, Andrews JG, Chen R: Broadband wireless access with WiMax/802.16: current performance benchmarks, and future potential. IEEE Communications Magazine 2005, 43(2):129-136. CrossRef
Bletsas A, Shin H, Win MZ: Cooperative communications with outage-optimal opportunistic relaying. IEEE Transactions on Wireless Communications 2007, 6(9):3450-3460. CrossRef
Markowitz H: Portfolio selection. The Journal of Finance 1952, 7(1):77-91. 10.2307/2975974
Markowitz H: Foundations of portfolio theory. The Journal of Finance 1991, 46(2):469-477. 10.2307/2328831 CrossRef
Zhao B, Valenti MC: Practical relay networks: a generalization of hybrid-ARQ. IEEE Journal on Selected Areas in Communications 2005, 23(1):7-18. CrossRef
Dai L, Cimini LJ Jr.: Improved fairness in energy-constrained cooperative ad-hoc networks. Proceedings of the 40th Annual Conference on Information Sciences and Systems (CISS '06), March 2006, Princeton, NJ, USA 734-738.
Dai L, Chen W, Letaief KB, Cao Z: A fair multiuser cooperation protocol for increasing the throughput in energy-constrained ad-hoc networks. Proceedings of IEEE International Conference on Communications (ICC '06), June 2006, Istanbul, Turkey 8: 3633-3638.
Chen W, Dai L, Letaief KB, Cao Z: Fair and efficient resource allocation for cooperative diversity in ad-hoc wireless networks. Proceedings of IEEE Wireless Communications and Networking Conference (WCNC '07), March 2007, Hong Kong 4099-4104.
Krikidis I, Belfiore JC: Three scheduling schemes for amplify-and-forward relay environments. IEEE Communications Letters 2007, 11(5):414-416. CrossRef
Huang W-J, Chiu F-H, Kuo C-CJ, Hong Y-W: Comparison of power control schemes for relay sensor networks. Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP '07), April 2007, Honolulu, Hawaii, USA 3: 477-480.
Michalopoulos DS, Karagiannidis GK: PHY-layer fairness in amplify and forward cooperative diversity systems. IEEE Transactions on Wireless Communications 2008, 7(3):1073-1083. CrossRef
Laneman JN: Cooperative diversity in wireless networks: algorithms and architectures, Ph.D. dissertation. Massachusetts Institute of Technology, Cambridge, Mass, USA; August 2002.
Goldsmith A: Wireless Communications. Cambridge University Press, Cambridge, UK; 2005. CrossRef
Bletsas A, Khisti A, Reed DP, Lippman A: A simple cooperative diversity method based on network path selection. IEEE Journal on Selected Areas in Communications 2006, 24(3):659-672. CrossRef
Vicario JL, Antón-Haro C: Analytical assessment of multi-user vs. spatial diversity trade-offs with delayed channel state information. IEEE Communications Letters 2006, 10(8):588-590. 10.1109/LCOMM.2006.1665119 CrossRef
Yang L, Alouini M-S: Performance analysis of multiuser selection diversity. Proceedings of IEEE International Conference on Communications (ICC '04), June 2004, Paris, France 5: 3066-3070.
Bartolomé D: Fairness analysis of wireless beamforming schedulers, Ph.D. dissertation. Universitat Politecnica de Catalunya, Barcelona, Spain; January 2005.
Bengtsson M, Bartolomé D, Vicario JL, Antón-Haro C: Beamforming and bit-loading strategies for multi-user SDMA with admission control. Proceedings of the 16th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC '05), September 2005, Berlin, Germany 2: 842-846.
Bosisio R, Primolevo G, Simeone O, Spagnolini U: Fair scheduling and orthogonal linear precoding/decoding in broadcast MIMO systems. Proceedings of the 16th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC '05), September 2005, Berlin, Germany 2: 832-836.
Zagami A: Beamforming and bit-loading strategies for multi-user MIMO systems, M.S. thesis. Universitat Politecnica de Catalunya and Politecnico di Torino, Barcelona, Spain; June 2006.
Vicario JL, Antón-Haro C: A unified approach to the analytical assessment of multi-user diversity with imperfect channel state information: ergodic capacity and robustness analysis. European Transactions on Telecommunications 2007, 18(6):573-582. 10.1002/ett.1234 CrossRef
- Outage Probability versus Fairness Trade-off in Opportunistic Relay Selection with Outdated CSI
Jose Lopez Vicario
- Springer International Publishing
- EURASIP Journal on Wireless Communications and Networking
Elektronische ISSN: 1687-1499
Neuer Inhalt/© ITandMEDIA, Product Lifecycle Management/© Eisenhans | vege | Fotolia