Journal of the Institute of Electronics Engineers of Korea TC (대한전자공학회논문지TC)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Fair Relay Selection in Regenerative OFDMA Relay Network

재생 OFDMA 중계 네트워크에서의 공평한 중계기 선택

  • 정하린 (KIS 채권평가(주) 파생상품팀) ;
  • 김진수 (서울대학교 전기.컴퓨터공학부) ;
  • 이재홍 (서울대학교 전기.컴퓨터공학부)
  • Published : 2009.02.25
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Abstract

This paper presents a new adaptive relay selection scheme for a regenerative orthogonal frequency division multiplexing access(OFDMA) relay network with fairness constrains. In the Proposed scheme, we select the best M relays out of a set of K potential relays to maximize system capacity. Among these selected relays, subcarriers are reallocated to satisfy fairness constraints as well as to minimize the degradation of the system performance. Afterwards, power allocation is performed for each subcarrier based on the water-filling method to enhance the performance improvement. By using the trade-off relationship between the system capacity and the fairness, the modified version of proposed scheme is also investigated.

본 논문은 공평성 제한(fairness constraint)이 존재하는 재생(regenerative) 직교 주파수 분할 다중 접속 (OFDMA: Orthogonal Frequency Division Multiple Access) 중계 네트워크(relay network)에서 새로운 적응 중계기 선택(adaptive relay selection) 기법을 제안한다. 제안된 기법에서 K 개의 중계기 중 시스템 용량(system capacity)을 최대화하는 M 개의 중계기를 선택한다. 선택된 중계기 사이에서는 공평성 제한을 만족하면서 시스템 성능 열화(system performance degradation)를 최소화하도록 부반송파를 재할당(subcarrier reallocation)한다. 그런 다음 보다 향상된 성능을 얻기 위해 워터필링(water-filling) 방법을 통한 적응적 전력할당이 이루어진다. 시스템 용량과 공평성 사이의 트레이드오프(trade-off) 관계를 이용하여 제안된 기법의 개선 방법 또한 연구되었다.

Keywords

References

  1. R. Pabst, et al., 'Relay-based deployment concept for wireless and broadband radio,' IEEE Commun. Mag., vol. 42, no. 9, pp. 80-89, Sep. 2004 https://doi.org/10.1109/MCOM.2004.1336724
  2. J. N. Laneman, D. N. C. Tse, and G. W. Wornell, 'Cooperative diversity in wireless networks: Efficient protocols and outage behavior,' IEEE Trans. Inform. Theory, vol. 50, no. 12, pp. 3062-3080, Dec. 2004 https://doi.org/10.1109/TIT.2004.838089
  3. J. Cai, X. Shen, J. W. Mark, and A. S. Alfa, 'Resource allocation in wireless relay networks,' in proc. of IEEE GLOBECOM '06, San Francisco, CA, Nov. 27-Dec. 1, 2006
  4. G. Li and H. Liu, 'Resource allocation for OFDMA relay networks with fairness constraints,' IEEE J. Sel. Areas Commun., vol. 24, no. 11, pp. 2061-2069, Nov. 2006 https://doi.org/10.1109/JSAC.2006.881627
  5. W. Ying, Q. Xin-chun, W. Tong, and L. Bao-ling, 'Power allocation and subcarrier paring algorithm for regenerative OFDM relay system,' in Proc. IEEE VTC '07-Spring, Dublin, Ireland, Apr. 22–25, 2007, pp. 2727-2731
  6. I. Hammerstrom and A. Wittneben, 'On the optimal power allocation for nonregenerative OFDM relay links,' in Proc. IEEE ICC '06, Istanbul, Turkey, Jun. 11-15, 2006, pp. 4463-4468
  7. 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, Mar. 2006 https://doi.org/10.1109/JSAC.2005.862417
  8. Y. J. Zhang and K. B. Letaief, 'Multiuser adptive subcarrier-and-bit allocation with adaptive cell selection for OFDM systems,' IEEE Trans. Wireless Commun., vol. 3, no. 5, pp. 1566-1575, Sep. 2004 https://doi.org/10.1109/TWC.2004.833501