The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

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

An Adaptive Path Selection Technique Considering Time Difference of Arrival in Multi-hop Relay Systems

다중 홉 릴레이 시스템에서 전파 시간 차이가 고려된 적응적 경로 선택 기법

  • 우경수 (중앙대학교 디지털통신 연구실) ;
  • 박창환 (중앙대학교 디지털통신 연구실) ;
  • 유현일 (중앙대학교 디지털통신 연구실) ;
  • 김재권 (연세대학교 컴퓨터정보통신공학부) ;
  • 한승희 (삼성전자 통신연구소) ;
  • 조용수 (중앙대학교 디지털통신 연구실)
  • Published : 2009.04.30
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper, the effect of ISI(Inter-Symbol Interference) and ICI(Inter-Carrier Interference) due to time difference of arrival on OFDMA-based mobile multi-hop relay (MMR) systems is analyzed. Analyses are performed for the ISI caused by the previous OFDMA symbol transmitted from neighboring macro or relay cell as well as the ISI caused by the next OFDMA symbol transmitted from neighboring macro or relay cell. Then, an effective SINR(Signal to Interference plus Noise Ratio) estimation method and a path selection method considering time difference of arrival are proposed to minimize the effect of ISI and ICI. It is shown by simulation that the performance degradation caused by time difference of arrival can be significantly mitigated when the proposed path selection method is applied to the uplink of OFDMA-based MMR systems.

본 논문에서는 OFDMA(Orthogonal Frequency Division Multiple Access) 기반 MMR(Mobile Multi-hop Relay) 시스템에서 전파 시간 차이로 인한 ISI(Inter-Symbol Interference)와 ICI(Inter-Carrier Interference)에 대한 영향을 인접 매크로 셀 또는 릴레이 셀에서 전송된 이전 OFDMA 심볼에 의한 ISI와 다음 OFDMA 심볼에 의한 ISI로 나누어 분석한다. 또한, 이를 극복할 수 있는 ISI와 ICI가 반영된 Effective SINR(Signal to Interference plus Noise Ratio) 추정 기법과 이를 이용한 하향링크, 상향링크의 전송 경로 결정 기법을 제안한다. 모의 실험을 통하여 본 논문에서 제안한 전송 경로 결정 기법을 상향링크에 적용할 경우에 OFDMA 기반 MMR 시스템에서 전파 시간 차이로 인한 성능 열화를 크게 완화할 수 있음을 보인다.

Keywords

References

  1. IEEE Std 802.16e, IEEE standard for local andmetropolitan area networks part 16, Feb. 2006
  2. 3GPP TS 36.211, Evolved universal terrestrialradio access (E-UTRA); physical channels andmodulation, Sept. 2008
  3. IEEE 802.16j-06/026r4, Baseline document fordraft standard for local and metropolitan areanetworks part 16, June 2007
  4. IEEE 802.16m-08/003r6, IEEE 802.16m systemdescription document [Draft], Dec. 2008
  5. REV-080019, 'Consideration on technicalcandidates for IMT-advanced,' 3GPP RANIMT Advanced Workshop, Shenzhen, Apr.2008
  6. R. Pabst, et. al, 'Relay-based deploymentconcepts for wireless and mobile broadbandradio,' IEEE Commun. Mag., vol. 42, pp. 80-89,Sept. 2004
  7. J. Cho and Z. J. Haas, 'On the throughputenhancement of the downstream channel incellular radio networks through multihop relaying,' IEEE J. Select. Areas Commun., vol.22, pp. 1206-1219, Sept. 2004 https://doi.org/10.1109/JSAC.2004.829340
  8. E. Kwon, J. Lee, M. ?S. Do, and K. Jung,'Comparison of symmetric and asymmetricrouting for fixed two-hop cellular relaying network,' IEEE Commun. Letters, vol. 11, pp.378-380. May 2007 https://doi.org/10.1109/LCOMM.2007.061887
  9. S. Chen and C. Zhu, 'ICI and ISI Analysis and mitigation for OFDM systems with insufficient cyclic prefix in time-varying Channels,' IEEE Trans. Consumer Electronics, vol. 50, pp.78-83, Feb. 2004 https://doi.org/10.1109/TCE.2004.1355879
  10. J. Kim and E. J. Powers, 'Subsymbolequalizations for discrete multitone systems,'IEEE Trans. Commun., vol. 53, pp.1551-1560,Sept. 2005 https://doi.org/10.1109/TCOMM.2005.855015
  11. M.O. Hasna, and M.S. Alouini, 'Optimal powerallocation for relayed transmissions overrayleigh-fading channels,' IEEE Trans. Wireless Commun., vol. 3, pp. 1999-2004. Nov.2004 https://doi.org/10.1109/TWC.2004.833447
  12. IEEE C802.16j-07/526r3, Direct Relay usingM&F, Sep. 2007
  13. S. Boumard, 'Novel noise variance and SNRestimation algorithm for wireless MIMOOFDM systems,' IEEE GLOBECOM 2003,vol. 3, pp. 1330 - 1334, Dec. 2003