한국인터넷방송통신학회논문지 (The Journal of the Institute of Internet, Broadcasting and Communication)

  • 제16권1호
  • /
  • Pages.61-67
  • /
  • 2016
  • /
  • 2289-0238(pISSN)
  • /
  • 2289-0246(eISSN)
한국인터넷방송통신학회 (The Institute of Internet, Broadcasting and Communication)
권호 표지
DOI QR코드

DOI QR Code

Rayleigh 페이딩 채널에서 랜덤한 릴레이를 갖는 기회전송 증가 릴레이 시스템의 성능

Performance of Opportunistic Incremental Relaying Systems with Random Relays in Rayleigh Fading Channels

  • Kim, Nam-Soo (Dept. of Electronic Engineering, Cheongju University)
  • 투고 : 2015.12.24
  • 심사 : 2016.02.05
  • 발행 : 2016.02.29
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

기회전송 증가 릴레이 시스템은 무선채널의 페이딩을 효과적으로 극복하고 무선 자원을 효율적으로 사용할 수 있는 장점을 갖는다. 그러나 지금까지 기회전송 증가 릴레이 시스템 연구에서는 릴레이의 위치가 공간적으로 고정되어 있는 것을 가정하였다. 일반적으로 모바일 환경에서는 사용자 터미널이 릴레이로 사용되는데, 사용자 터미널은 계속해서 움직이기 때문에 고정된 릴레이를 가정하는 것은 현실적이지 않다. 따라서 본 논문은 공간적으로 랜덤하게 분포된 사용자 터미널의 위치를 포아송 포인트 프로세스 (Poisson point process)로 모델링하고, 기회전송 증가 릴레이 시스템의 성능을 유도하였다. 유도 결과 릴레이가 랜덤하게 분포된 경우에도 릴레이가 고정된 경우와 마찬가지로 시스템의 성능이 향상되었으며, 릴레이의 밀도와 송수신 각도가 시스템의 성능에 영향을 주는 것을 알 수 있었다. 또한 최대비 결합과 선택결합 수신방법에 따른 시스템의 성능을 비교하였다.

Opportunistic incremental relaying (OIR) system effectively overcomes the degradations caused by the fading of the wireless channel, and efficiently utilizes the wireless resources. Most of the OIR studies, however, assume spatially fixed relays. The user terminals which are usually served as relays move continuously, the assumption that the relays are fixed is not realistic. In this paper, the location of the spatially random user terminals are modeled by the Poisson point process, and the performance of an OIR system is derived. We noticed that the performance of the OIR system improves with the spatially random relays as well as with the fixed relays. Also the intensity of the relays and the transmitting directions toward the destination affect the performances. The performances of the maximal ratio combining (MRC) and the selection combining (SC) at the destination are compared.

키워드

참고문헌

  1. J. N. Laneman, D. N. C. Tse, and G. W. Wornell, "Cooperative diversity in wireless networks: efficient protocols and outage behavior," IEEE Trans. in Information Theory, vol.50, no.12, pp. 3062-3080, Dec. 2004. https://doi.org/10.1109/TIT.2004.838089
  2. A. Bletsas, H. Shin, M. Z. Win, "Cooperative communications with outage-optimal opportunistic relaying," IEEE Trans. on Wireless Communi., vol.6, no.9, pp.3450-3460, Sep. 2007. https://doi.org/10.1109/TWC.2007.06020050
  3. S. S. Ikki and M. H. Ahmed, "Performance analysis of incremental-relaying cooperative-diversity networks over Rayleigh fading channels," IET Commun., vol.5, no.3, pp.337-349, Feb. 2011. https://doi.org/10.1049/iet-com.2010.0157
  4. K. Tourki, H.-C. Yang, and M.-S. Alouini, "Accurate outage analysis of incremental decode-and-forward opportunistic relaying," IEEE Trans. on Wireless Commun., vol.10, no.4, pp.1021-1025, April 2011. https://doi.org/10.1109/TWC.2011.021611.100472
  5. Nam-Soo Kim,"Performance evaluation of opportunistic incremental relay systems by using partial and full channel information in Rayleigh fading channels," Journal of Institute of Internet, Broadcasting and Commun., vol.13, no.6, pp. 71-78, Dec. 2013. https://doi.org/10.7236/JIIBC.2013.13.6.71
  6. H. Wang, S. Ma, T.-S. Ng, and H. V. Poor, "A general analytical approach for opportunistic cooperative systems with spatially random relays," IEEE Trans. on Wireless Commun., vol.10, no.12, pp.4122-4129, Dec. 2011. https://doi.org/10.1109/TWC.2011.093011.101386
  7. A. Behnad, A. M. Rabiei, N. C. Beaulieu, "Performance analysis of opportunistic relaying in a Poisson field of amplify-and-forward relay," IEEE Trans. on Commun., vol.61, no.1, pp. 97-107, Jan. 2013. https://doi.org/10.1109/TCOMM.2012.12.110411
  8. C. Zhai, W. Zhang, and G. Mao, "Uncoordinated cooperative communications with spatially random relays," IEEE Trans. on Wireless Commun., vol.11, no.9, pp.3126-3135, Sep. 2012. https://doi.org/10.1109/TWC.2012.072512.111065
  9. A. Tukmanov, S. Boussakta, Z. Ding, and A. Jamalipour, "Outage performance of imperfect- CSI-based selection cooperation in random networks," IEEE Trans. on Commun., vol.62, no.8, pp.2747-2756, Aug. 2014. https://doi.org/10.1109/TCOMM.2014.2322093
  10. A. Bletsas, A. Khisti, D. P. Reed, and A. Lippman, "A simple cooperative diversity method based on network path selection," IEEE J. Select. Areas Commun., vol.24, pp.659-672, Mar. 2006. https://doi.org/10.1109/JSAC.2005.862417
  11. G. L. Stuber, Principles of mobile communication, 2nd Ed., Kluwer Academic Publishers, 2001.
  12. Andrea Goldsmith, Wireless Communications, Cambridge Univ. Press, 2005.
  13. D. Stoyan, W. Kendall, and J. Mecke, Stochastic geometry and its applications, John Wiley and Sons Ltd, 1995.
  14. J. Kingman, Poisson Process, ch.5, Oxford university press, 1993.
  15. I. S. Gradshteyn and I.M. Ryzhik, Table of integrals, series, and products, 6th Ed., Academic Press, 2000.