Acta Metallurgica Sinica(English letters) ›› 2008, Vol. 15 ›› Issue (4): 7-7–1.doi:

• Wireless • Previous Articles     Next Articles

Over-sampling basis expansion model aided channel estimation for OFDM systems with ICI

LIU Si-yang, LIU Yuan-an, WANG Fei-fei, XIE Gang, ZHANG Ran-ran   

  1. Key Laboratory of Universal Wireless Communications (Beijing University of Posts and Telecommunications), Ministry of Education, Beijing 100876, China
  • Received:2008-05-02 Revised:1900-01-01 Online:2008-12-30
  • Contact: LIU Si-yang

Abstract:

The rapid variation of channel can induce the intercarrier interference in orthogonal frequency-division multiplexing (OFDM) systems. Intercarrier interference will significantly increase the difficulty of OFDM channel estimation because too many channel coefficients need be estimated. In this article, a novel channel estimator is proposed to resolve the above problem. This estimator consists of two parts: the channel parameter estimation unit (CPEU), which is used to estimate the number of channel taps and the multipath time delays, and the channel coefficient estimation unit (CCEU), which is used to estimate the channel coefficients by using the estimated channel parameters provided by CPEU. In CCEU, the over-sampling basis expansion model is resorted to solve the problem that a large number of channel coefficients need to be estimated. Finally, simulation results are given to scale the performance of the proposed scheme.

Key words:

OFDM;ICI;over-sampling basis expansion model (OBEM)