Journal of Communications and Networks

The Korean Institute of Commucations and Information Sciences (한국통신학회)
권호 표지

Multi-Relay Cooperative Diversity Protocol with Improved Spectral Efficiency

  • Asaduzzaman, Asaduzzaman (Department of Computer Science and Engineering, Chittagong University of Engineering and Technology) ;
  • Kong, Hyung-Yun (Department of Electrical Engineering, University of Ulsan)
  • Received : 2009.10.12
  • Accepted : 2010.10.06
  • Published : 2011.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

Cooperative diversity protocols have attracted a great deal of attention since they are thought to be capable of providing diversity multiplexing tradeoff among single antenna wireless devices. In the high signal-to-noise ratio (SNR) region, cooperation is rarely required; hence, the spectral efficiency of the cooperative protocol can be improved by applying a proper cooperation selection technique. In this paper, we present a simple "cooperation selection" technique based on instantaneous channel measurement to improve the spectral efficiency of cooperative protocols. We show that the same instantaneous channel measurement can also be used for relay selection. In this paper two protocols are proposed-proactive and reactive; the selection of one of these protocols depends on whether the decision of cooperation selection is made before or after the transmission of the source. These protocols can successfully select cooperation along with the best relay from a set of available M relays. If the instantaneous source-to-destination channel is strong enough to support the system requirements, then the source simply transmits to the destination as a noncooperative direct transmission; otherwise, a cooperative transmission with the help of the selected best relay is chosen by the system. Analysis and simulation results show that these protocols can achieve higher order diversity with improved spectral efficiency, i.e., a higher diversity-multiplexing tradeoff in a slow-fading environment.

Keywords

References

  1. J. N. Laneman, D. N. C. Tse, and G. W. Wornell, "Cooperative diversity in wireless networks: Efficient protocols and outage behavior", IEEE Trans. Inf. Theory, vol. 50, no. 12, pp. 3062-3080, 2004. https://doi.org/10.1109/TIT.2004.838089
  2. A. Sendonaris, E. Erkip, and B. Aazhang, "User cooperation diversity - part 1: System description," IEEE Trans. Commun., vol. 51, no. 11, pp. 1927-1938,2003. https://doi.org/10.1109/TCOMM.2003.818096
  3. T. E. Hunter and A. Nosratinia, "Diversity through coded cooperation," IEEE Trans. Wireless Commun., vol. 5, no. 2, pp. 283-289, 2006.
  4. A. Stefanov and E. Erkip, "Cooperative coding for wireless networks," IEEE Trans. Commun., vol. 52, no. 9, pp. 1470-1476,2004. https://doi.org/10.1109/TCOMM.2004.833070
  5. J. N. Laneman and G. W. Wornell, "Distributed space-time-coded protocols for exploiting cooperative diversity in wireless networks," IEEE Trans. Inf. Theory, vol. 49, no. 10, pp. 2415-2425, 2003. https://doi.org/10.1109/TIT.2003.817829
  6. A. Bletsas, A. Khisti, D. P. Reed, and A. Lippman, ''A simple cooperative diversity method based on network path selection," IEEE J. Sel. Areas Commun., vol. 24, no. 3, pp. 659-672, 2006.
  7. A. Bletsas, H. Shin, and M. Z. Win, "Cooperative communications with outage-optimal opportunistic relaying," IEEE Trans. Wireless Commun., vol. 6, no. 9, pp. 3450-3460, 2007.
  8. E. Beres and R. Adve, "Selection cooperation in multi-source cooperative networks," IEEE Trans. Wireless Commun., vol. 7, no. 1, pp. 118-127. 2008.
  9. A. Bletsas, A. Khisti, and M. Z. Win, "Low complexity virtual antenna arrays using cooperative relay selection," in Proc. IWCMC, Vancouver, British Columbia, Canada, 2006, pp. 461-466.
  10. T. S. Rappaport, Wireless Communications : Principles and Practice. Upper Saddle River, N.J.: Prentice Hall, 1996.
  11. K. Azarian, H. el Gamal, and P. Schniter, "On the achievable diversity-multiplexing tradeoff in half-duplex cooperative channels," IEEE Trans. Inf. Theory, vol. 51, no. 12, pp. 4152-4172, 2005. https://doi.org/10.1109/TIT.2005.858920
  12. A. Papoulis and S. U. Pillai, Probability, Random Variables, and Stochastic Processes, 4th ed. Boston: McGraw-Hill, 2002.
  13. D. Gunduz and E. Erkip, "Opportunistic cooperation by dynamic resource allocation," IEEE Trans. Wireless Commun., vol. 6, no. 4, pp. 1446-1454, 2007. https://doi.org/10.1109/TWC.2007.348341
  14. J. G. Proakis, Digital Communications. 4th ed., Boston: McGraw-Hill, 2001.
  15. M. Dong and L. Tong, "Optimal design and placement of pilot symbols for channel estimation," IEEE Trans. Signal Process., vol. 50, no. 12, pp. 3055-3069, Dec. 2002. https://doi.org/10.1109/TSP.2002.805504