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http://dx.doi.org/10.7236/JIWIT.2012.12.5.11

Performance of DOT Relay System with MRC/GSC receiver in Rayleigh Fading Channels  

Kim, Nam-Soo (Dept. of Electronics Engineering, Cheongju University)
Publication Information
The Journal of the Institute of Internet, Broadcasting and Communication / v.12, no.5, 2012 , pp. 11-16 More about this Journal
Abstract
Opportunistic transmit cooperative relaying (OTR) system has been interested for its ability to mitigate the fading in wireless channel without multiple antennas in a small terminal. In OTR system, only the relays that the received Signal-to-noise ratio (SNR) from a source is greater than the threshold transmit to the destination. However, the receiving branches of a destination in a realistic system is fixed, the excess number of signals from the transmit relays does not improve the system performance and consequently increases power consumption. In this paper, we adopt Double Opportunistic Transmit (DOT) cooperative diversity system which controls the average number of transmit relays. Although the average number of the transmit relays can be controlled by adjusting the two thresholds in DOT system, the instantaneous number of transmit relays is varying in fading channel. Thus we propose Maximal Ratio Combining (MRC) or Generalized Selection Combining (GSC) according to the number of the signals from relays at the destination. The outage probability of the proposed system is derived in closed form. The analytical results show that the system performance is improved with the number of the branches. Also it is noticed that when the number of the branches is fixed, the outage probability decreases with the increase of the average SNR of S-R path and R-D path.
Keywords
Cooperative diversity; GSC; DOT; Relay; Opportunistic transmission;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 N.C. Beaulieu, and J. Hu, "A closed form expression for the outage probability of Decode-and-forward relaying in dissimilar Rayleigh fading channels," IEEE Communications Letters, vol.10, no.12, pp.813-815, Dec. 2006.   DOI   ScienceOn
2 Salama Ikki, Mohamed Ahmed, "Performance analysis of generalized selection combining for decodeand- forward cooperative-diversity networks," in Proceedings of Vehicular Technology Conference, pp.1-5, Sep. 2010.
3 Nam-Soo Kim, Ye Hoon Lee, "Double opportunistic transmit relaying system with GSC for power saving in Rayleigh fading channel," in Proceedings of IEEE International conference on communications (COMM2010), pp.368-370, June 2010.
4 Nam-Soo Kim, "Performance analysis of a double opportunistic cooperative diversity system with uniform power relay selection," Journal of IWIT (The institute of webcasting, internet and telecommunication), vol.11, no.6, pp. 15-21, Dec. 2011.   과학기술학회마을
5 Y. Zhio, R. Adve, and T. Lim, "Outage probability at arbitrary SNR with cooperative diversity," IEEE Communications Letters, vol.9, no.8, pp.700-702, Aug. 2005.   DOI   ScienceOn
6 D. Gesbert, M-S Alouini, "How much feedback is multi-user diversity really worth?," in Proceedings of IEEE International Conference on Communications (ICC), pp. 234-238, June 2004.
7 Andrea Goldsmith, Wireless Communications, Cambridge University Press, 2005.
8 M.K. Simon, M-S Alouini, Digital communications over fading channels, JohnWiley&Sons, 2000.