New estimation and equalization approach for OFDM under Doppler-spread channel

Mitsuru Nakamura, Tsutomu Seki, Makoto Itami, Kohji Itoh, A. Hamid Aghvami

Research output: Chapter in Book/Report/Conference proceedingConference contribution

11 Citations (Scopus)

Abstract

In OFDM transmission, a loss of sub-carrier orthogonality due to Doppler-spread of the channel leads to inter-carrier interference(ICI), especially, under mobile reception environments. ICI causes significant degradation of bit error rate characteristics and this influence becomes larger as the carrier frequency or moving velocity of the receiver increases. In this paper, a method to reduce the ICI caused by Doppler-spread of the channel is proposed. In the proposed method, the transmission channel is modeled by a combination of multiple Doppler-shifted propagation paths and their parameters such as attenuation, relative delay and Doppler-shift are estimated using scattered pilot symbols. Then, ICI is canceled by multiplying the inverse matrix of the estimated channel matrix to the received OFDM symbol vector. As the result of computer simulation, it is confirmed that the proposed method can improve the bit error rate characteristics under Doppler-spread channel.

Original languageEnglish
Title of host publication13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2002
Pages555-560
Number of pages6
DOIs
Publication statusPublished - 1 Dec 2002
Event13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2002 - Lisboa, Portugal
Duration: 15 Sep 200218 Sep 2002

Publication series

NameIEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC
Volume2

Conference

Conference13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2002
CountryPortugal
CityLisboa
Period15/09/0218/09/02

Keywords

  • Channel elstimation
  • Doppler-spread
  • Equalization
  • ICI
  • OFDM

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  • Cite this

    Nakamura, M., Seki, T., Itami, M., Itoh, K., & Aghvami, A. H. (2002). New estimation and equalization approach for OFDM under Doppler-spread channel. In 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2002 (pp. 555-560). [1047283] (IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC; Vol. 2). https://doi.org/10.1109/PIMRC.2002.1047283