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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Channel Estimation Scheme for WLAN Systems with Backward Compatibility

  • Kim, Jee-Hoon (Advanced Communications Research Laboratory, ETRI) ;
  • Yu, Hee-Jung (Advanced Communications Research Laboratory, ETRI) ;
  • Lee, Sok-Kyu (Advanced Communications Research Laboratory, ETRI)
  • Received : 2011.08.17
  • Accepted : 2011.11.30
  • Published : 2012.06.01
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Abstract

IEEE 802.11n standards introduced a mixed-mode format frame structure to achieve higher throughput with multiple antennas while providing backward compatibility with legacy systems. Although multi-input multi-output channel estimation was possible only with high-throughput long training fields (HT-LTFs), the proposed scheme utilizes a legacy LTF as well as HT-LTFs in a decision feedback manner to improve the accuracy of the estimates. It was verified through theoretical analysis and simulations that the proposed scheme effectively enhances the mean square error performance.

Keywords

References

  1. IEEE Std. 802.11n, IEEE Standard for Information Technology- Telecommunications and Information Exchange between Systems-Local and Metropolitan Area Networks-Specific Requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications Amendment 5: Enhancements for Higher Throughput, IEEE, Piscataway, N.J., 2009.
  2. Y.-H. You et al., "Channel Estimation Method with Interference Reduction for High-Rate Personal Area Networks," Electron. Lett., vol. 37, no. 9, 2001, pp. 588-590. https://doi.org/10.1049/el:20010381
  3. E. Perahia and R. Stacey, Next Generation Wireless LANs: Throughput, Robustness, and Reliability in 802.11n, Cambridge University Press, 2008.
  4. S.-Y. Jung and S. Kim, "Channel Estimation and LDPC Code Puncturing Schemes Based on Incremental Pilots for OFDM," ETRI J., vol. 32, no. 4, Aug. 2010, pp. 603-606. https://doi.org/10.4218/etrij.10.0210.0101
  5. I-T. Lu and K.-J. Tsai, "Channel Estimation in a Proposed IEEE802.11n OFDM MIMO WLAN System," Proc. Sarnoff Symp., 2007, pp. 1-5.
  6. J.-H. Lee, M.-S. Baek, and H.-K. Song, "Efficient MIMO Receiving Technique in IEEE 802.11n System for Enhanced Services," IEEE Trans. Consum. Electron., vol. 53, no. 2, May 2007, pp. 344-349.
  7. J. Lorincz and D. Begusic, "Adaptive Beamforming Structure with STBC for IEEE 802.11n WLAN Systems," Proc. SOFTCOM, 2008, pp. 258-263.

Cited by

  1. IEEE 802.11 기반 시스템에서 채널추정에 관한 연구 vol.12, pp.3, 2012, https://doi.org/10.14400/jdc.2014.12.3.249