Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
권호 표지
DOI QR코드

DOI QR Code

Rate Control for OFDM-based Wireless Networks

OFDM 기반 무선 네트워크의 전송률 제어 기법

  • 김성원 (영남대학교 전자정보공학부)
  • Published : 2008.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

A protocol is proposed to control the rate of each subcarrier in OFDM-based wireless network systems. The proposed protocol adds an OFDM symbol in CTS frame defined in IEEE 802.11 standard. A receiver determines the rate of its subcarrier after it receives the RTS frame. The determined rate is added to OFDM symbol in CTS frame. In order to synchronize the rate information between the sender and the receiver, error recovery process is proposed. The performance improvement of the proposed method is shown by numerical results.

OFDM 기반 무선 네트워크 시스템에서 서브캐리어(subcarrier) 단위로 전송률을 제어하는 기법을 제안한다. 제안된 프로토콜은 IEEE 802.11 표준에 정의된 CTS 프레임에 하나의 OFDM 심벌을 추가하여 구현된다. 수신기는 RTS 프레임을 수신한 후 해당 서브캐리어에 적절한 전송률을 결정하고, 이 결과를 CTS에 추가된 OFDM 심벌을 통하여 전달한다. 송신기와 수신기 사이의 전송률을 일치시키기 위한 에러 복구 방법도 제안한다. 제안된 기법을 통하여 무선 네트워크 시스템의 성능 향상이 이루어짐을 보인다.

Keywords

References

  1. P. Chevillat, J. Jelitto, A. N. Barreto, and H. L. Truong, "A dynamic link adaptation algorithm for IEEE 802.11a wireless LANs,"" Proc. ICC''03, vol. 2, pp. 1141-1145, May 2003
  2. D. Qiao, and S. Choi, "Goodput enhancement of IEEE 802.11a wireless LAN via link adaptation," Proc. IEEE ICC'01, vol.7, pp. 1995-2000, June 2001
  3. D. Qiao, S. Choi, and K. G. Shin, ""Goodput analysis and link adaptation for IEEE 802.11a wireless LANs,"" IEEE Trans. Mobile Computing, vol. 1, pp. 278-291, December 2002 https://doi.org/10.1109/TMC.2002.1175541
  4. R. Grunheid, E. Bolinth and H. Rohling, "A blockwise loading algorithm for the adaptive modulation technique in OFDM systems," IEEE VTC 2001 FAll, Vol. 2, pp.948-951, Oct. 2001
  5. A. G. Armada, ""A simple multiuser bit loading algorithm for a multicarrier WLAN,"" IEEE ICC 2001, Vol. 4, pp. 1168-1171, June 2001
  6. A. G. Armada, ""SNR Gap Approximation for M- PSK-Based Bit Loading,"" IEEE Transactions on Wireless Communications, Vol. 5, No. 1, pp. 57-60, January 2006 https://doi.org/10.1109/TWC.2006.1576527
  7. D. dardari, "Ordered subcarrier selection algorithm for OFDM-based high-speed WLANs," IEEE Trans. Wireless Communi. vol. 3, no. 5, September 2004
  8. IEEE 802.11 WG, Part 11: Wireless LAN Medium Access Control (MAC) and Physical layer (PHY) specifications, ANSI/IEEE Std 802.11, 1999
  9. IEEE 802.11 WG, Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications, ANSI/IEEE Std 802.11a/b, 1999, Supplement to ANSI/IEEE 802.11 Std 802.11, 1999 Edition
  10. G. Holland, N. Vaidya, and P. Bahl, "A rate-adaptive MAC Protocol for wireless networks," Proc. ACM MOBICOM'01, pp. 236-251, July 2001
  11. B.-S. Kim, Y. Fang, T. F. Wong, and Y. Kwon, "Throughput Enhancement through Dynamic Fragmentation with Rate-Adaptation in Wireless LANs," IEEE Transactions on Vehicular Technology, vol. 54, no. 4, July 2005