KSII Transactions on Internet and Information Systems (TIIS)

Korean Society for Internet Information (한국인터넷정보학회)
권호 표지
DOI QR코드

DOI QR Code

Performance Comparison of Orthogonal and Non-orthogonal AF Protocols in Cooperative Relay Systems

  • Bae, Young-Taek (Department of Electrical and Computer Engineering, Seoul National University) ;
  • Jung, Sung-Kyu (Department of Electrical and Computer Engineering, Seoul National University) ;
  • Lee, Jung-Woo (Department of Electrical and Computer Engineering, Seoul National University)
  • Received : 2011.12.17
  • Accepted : 2012.03.19
  • Published : 2012.04.30
Download PDF
⟨ Previous Next ⟩

Abstract

For a single relay channel, we compare the capacity of two different amplify-and-forward (AF) protocols, which are orthogonal AF (OAF) and non-orthogonal AF (NAF). The NAF protocol has been proposed to overcome a significant loss of performance of OAF in the high spectral efficiency region, and it was also theoretically proved that NAF performs better than OAF in terms of the diversity-multiplexing tradeoff. However, existing results have been evaluated at the asymptotically high signal to noise ratio (SNR), thus the power allocation problem between the source and the relay was neglected. We examine which protocol has better performance in a practical system operating at a finite SNR. We also study where a relay should be located if we consider the power allocation problem. A notable conclusion is that the capacity performance depends on both SNR and power allocation ratio, which indicates OAF may perform better than NAF in a certain environment.

Keywords

References

  1. I. E. Telatar, "Capacity of multi-antenna Gaussian channels," European Transaction Telecommunication, vol.10, no.6, pp.586-595, Nov.1999.
  2. S. M. Alamouti, "A simple transmit diversity technique for wireless communication," IEEE J. Sel. Areas Communication, vol.16, no.8, pp.1451-1458, Oct.1998. https://doi.org/10.1109/49.730453
  3. V. Tarokh, H. Jafarkhani and A. R. Calderbank, "Space-time block codes from orthogonal designs," IEEE Transaction Information Theory, vol.45, no.5, pp.1456-1467, Jul.1999. https://doi.org/10.1109/18.771146
  4. A. Nosratinia, T. E. Hunter and A. Hedayat, "Cooperative communication in wireless networks," IEEE Communications Magazine, vol.42, no.10, pp.74-80, Oct.2004. https://doi.org/10.1109/MCOM.2004.1341264
  5. A. Sendonaris, E. Erkip and B. Aazhang, "User cooperation diversity - Part I, II," vol.51, no.11, pp.1927-1948, Nov.2003. https://doi.org/10.1109/TCOMM.2003.818096
  6. J. N. Laneman and G. W. Wornell, "Distributed space-time-coded protocols for exploiting cooperative diversity in wireless networks," IEEE Transaction Information Theory, vol.49, no.10, pp.2415-2425, Oct.2003. https://doi.org/10.1109/TIT.2003.817829
  7. J. N. Laneman, D. N. C. Tse and G. W. Wornell, "Cooperative diversity in wireless networks: Efficient protocols and outage behavior," IEEE Transaction Information Theory, vol.50, no.12, pp.3062-3080, Dec.2004. https://doi.org/10.1109/TIT.2004.838089
  8. R. U. Nabar, H. Bolcskei and F. W. Kneub uhler, "Fading relay channels: Performance limits and space-time signal design," IEEE Journal Selective Areas Communication, vol.22, no.6, pp.1099-1109, Aug.2004. https://doi.org/10.1109/JSAC.2004.830922
  9. K. Azarian, H. E. Gamal and P. Schniter, "On the achievable diversity multiplexing tradeoff in half-duplex cooperative channels," IEEE Transaction Information Theory, vol.51, no.12, pp.4152-4172, Dec.2005. https://doi.org/10.1109/TIT.2005.858920
  10. R. Narasimhan, "Finite-SNR diversity performance of rate-adaptive MIMO systems," in Proc. of IEEE Global Telecommunications Conference, Nov.2005.
  11. R. Narasimhan, A. Ekbal and J. M. Cioffi, "Finite-SNR diversity multiplexing tradeoff of space-time codes," in Proc. of IEEE International Conference on Communication, May.2005.
  12. E. Zimmermann, P. Herhold and G. Fettweis, "On the performance of cooperative diversity protocols in practical wireless systems," in Proc. of IEEE Vehicular Technology Conference, Oct.2003.
  13. Y. Zhao, R. Adve and T. J. Lim, "Improving amplify-and-forward relay networks: Optimal power allocation versus selection," IEEE Transaction Wireless Communication, vol.6, no.8, pp.3114-3123, Aug. 2007.
  14. A. Saadani and O. Traore, "Orthogonal or non orthogonal amplify and forward protocol: How to cooperate?" in Proc. of IEEE Wireless Communications and Networking Conference, Mar.2008.
  15. M. Pischella and J.-C. Belfiore, "Optimal power allocation for downlink cooperative cellular networks," in Proc. of IEEE Vehicular Technology Conference, Apr.2007.
  16. M. Badr, E. C. Strinati and J.-C. Belfiore, "Optimal power allocation for hybrid amplify-and-forward cooperative networks," in Proc. of IEEE Vehicular Technology Conference, May.2008.
  17. F. Lin, T. Luo and T. Jiang, "Quasi-optimal power allocation based on ergodic capacity for wireless relay networks," Wireless Communications and Mobile Computing, Mar.2011.
  18. J. G. Proakis, Digital Communications, 4th ed. New York: McGrawHill, 2002.
  19. T. M. Cover and J. A. Thomas, Elements of Information Theory, 2009.