Time-varying channel estimation for OFDM systems


Oenen E., Akan A. , Chaparro L. F.

32nd IEEE International Conference on Acoustics, Speech and Signal Processing, Hawaii, United States Of America, 15 - 20 April 2007, pp.1281-1282 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • Doi Number: 10.1109/icassp.2007.367078
  • City: Hawaii
  • Country: United States Of America
  • Page Numbers: pp.1281-1282

Abstract

in the new generation wireless communication systems where high data rates are desired, Orthogonal Frequency Division Multiplexing (OFDM) has become the standard method because of its advantages over single carrier modulation schemes on multi-path, frequency selective fading channels. However, inter-carrier interference due to Doppler frequency shifts, and multi-path fading severely degrades the performance of OFDM systems. Estimation of channel parameters is required at the receiver. In this paper, we present a time-varying channel modeling and estimation method based on the Discrete Evolutionary Transform that provides a time-frequency procedure to obtain a complete characterization of a multi-path, fading and frequency selective channel. Performance of the proposed method is tested on different levels of channel noise, and Doppler frequency shifts.