The Proceeding of the Korean Institute of Electromagnetic Engineering and Science (한국전자파학회지:전자파기술)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
권호 표지

CR을 위한 OFDMA 기반 적응 전송 방식

  • 김윤희 (경희대학교 전자정보학부) ;
  • 김광순 (연세대학교 전기전자공학부)
  • Published : 2006.04.01
Download PDF
⟨ Previous Next ⟩

Abstract

CR은 사용자 환경의 실시간 조건에 따라 무선 파형을 적응시킴으로써 주파수 스펙트럼을 유연하고, 효율적이며, 신뢰성 있게 활용하는 지능적인 무선통신 방식을 의미한다. 한편, 무선 채널의 다양한 특성에 따라 시간 및 주파수 영역에서 자원의 동적 할당이 가능한 OFDMA 방식은 CR 시스템에 잘 부합되는 방식이라 할 수 있다. 본 고에서는 무선 환경에서 주파수 효율을 증대시키기 위해 OFDMA 기반 적응 전송 방식의 기술 동향을 살펴보고, 사용자 환경에 좀 더 지능적으로 대처하는 CR 시스템을 구현하기 위한 재구성 가능한 OFDMA 전송 플랫폼을 소개한다.

Keywords

References

  1. G. Maguire, J. Mitola, "Cognitive radio: making PCS personal", IEEE PCS Mag., Aug. 1999
  2. Joseph Mitola III, "Cognitive radio: An integrated agent architecture for software defined radio", Ph. D Dissertation, Royal Institute of Technology(KTH), May 2000
  3. S. Haykin, "Cognitive radio: brain-empowered wireless communications", IEEE J. Select. Areas Comm., vol. 23, no. 2, pp. 201-220, Feb. 2005 https://doi.org/10.1109/JSAC.2004.839380
  4. Federal Communications Commission (FCC), "Spectrum policy task force", Rep. ET Docket, no. 02- 135, Nov. 2002
  5. Federal Communications Commission (FCC), "Notice of proposed rule making", ET Docket, no. 04-113, May 2004
  6. K. Challapali, "Spectrum agile radios: real-time measurements", Cognitive Radio Conference, Washington DC, Oct. 2004
  7. IEEE 802.22 Working Group on Wireless Regional Area Networks, http://www.ieee802.org/22/
  8. IEEE 802.11a, High-speed physical layer in the 5 GHz band, 1999
  9. ETSI EN 300 401, Radio broadcasting systems: digital audio broadcasting(DAB) to mobile, portable and fixed receivers, Sep. 2000
  10. ETSI EN 300 799, Digital video broadcasting (DVB); framing, structure, channel coding and modulation for digital terrestrial television, Jun. 1999
  11. IEEE Std 802.16a-2003, Air interface for fixed broadband wireless access systems-medium access control modifications and additional physical layer specifications for 2-11 GHz, Apr. 2003
  12. IEEE P802.16e/D3, Amendment for physical and medium access control layers for combined fixed and mobile operation in licensed bands, May 2004
  13. TTAS.KO-06.0064R1, Specifications for 2.3 GHz band portable internet service-Physical layer, TTA, Dec. 2004
  14. J. Chuang, L. J. Cimini, G. Li, L. Lin, B. McNair, N. R. Sollenberger, M. Suzuki, and H. Zhao, "Highspeed wireless data access based on combining EDFE with wideband OFDM", IEEE CommunMagazine, vol. 37, pp. 92-98, Nov. 1999
  15. 김윤희, 안재영, "차세대 이동통신 무선 전송 기 술 연구 동향", 한국통신학회지, 22(9), pp. 39-49, 2005년 9월
  16. 3GPP TR 25.814, v0.2.0, "Physical layer aspects for evolved UTRA(Release 7)", Aug. 2005
  17. EP 01039683, Frequency hopping multiple access with multicarrier signals, Lucent technologies, Inc., Sep. 2000
  18. PCT WO 02/058300, Multicarrier communications with time division multiplexing and carrier selective loading, Broadstorm Telecommunications, Inc., Jul. 2002
  19. D. J. C. MacKay, "Good error correcting codes based on very sparse matrices", IEEE Trans. Inform. Theory, vol. 45, no. 2, pp. 399-431, Mar. 1999 https://doi.org/10.1109/18.748992
  20. K. S. Kim, Y. H. Kim, J. Y. Ahn, and S. G. Hwang, "A pragmatic adaptive OFDM/FDD cellular system in frequency-selective fading channels", Wireless World Research Forum(WWRF) 8bis Meeting, WG4, Beijing, China, Feb. 2004
  21. I. Kalet, "The multitone channel", IEEE Transactions on Communications, vol. 37, no. 2, pp. 119-124, Feb. 1989 https://doi.org/10.1109/26.20079
  22. P. Chow, J. Cioffi, and J. Bingham, "A practical discrete multitone transceiver loading algorithm for data transmission over spectrally shaped channels", IEEE Transactions on Communications, vol. 43, no. 2, Feb. 1995
  23. R. Fischer, J. Huber, "A new loading algorithm for discrete multitone transmission", in IEEE Proc. GLOBECOM, pp. 724-728, Nov. 1996
  24. T. Keller, L. Hanzo, "Adaptive modulation techniques for duplex OFDM transmission", IEEE Trans. Vehic. Techn., vol. 49, pp. 1893-1906, Sep. 2000 https://doi.org/10.1109/25.892592
  25. R. Grünheid, E. Bolinth, and H. Rohling, "A blockwise loading algorithm for the adaptive modulation technique in OFDM systems", Proc. IEEE Vehic. Techn. Confer. (VTC), Atlantic City, NJ, U.S.A., 2, pp. 948-951, Oct. 2001
  26. C. Y. Wong, R. S. Cheng, K. B. Letaief, and R. Murch, "Multiuser OFDM with adaptive subcarrier, bit and power allocation", IEEE Journal on Selected Areas of Comm., vol. 17, no. 10, pp. 1747-1758, Oct. 1999 https://doi.org/10.1109/49.793310
  27. D. Kivanc, H. Liu, "Subcarrier allocation and power control for OFDMA", Proc. Conference on Signals, Systems and Computers, vol. 1, pp. 147- 151. 2000
  28. T. Hunziker, D. Dahlhaus, "Optimal power adaptation for OFDM systems with ideal bit-interleaving and hard-decision decoding", Proc. IEEE Int. Conference on Communications(ICC), vol. 5, pp. 3392-3397, 2003
  29. W. Rhee, J. Cioffi, "Increase in capacity of multiuser OFDM system using dynamic subchannel allocation", in Proc. Vehicular Technology Conference( VTC), pp. 1085-1089, 2000
  30. M. Bohge, J. Groass, and A. Wolisz, "The potential of dynamic power and sub-carrier assignments in multi-user OFDM-FDMA cells", Proc. IEEE Globecom, St. Louis, MO, USA, Nov. 2005