A novel channel estimation method for OFDM mobile communication systems based on pilot signals and transform-domain processing

Author

Zhao, Yuping ; Huang, Aiping

Author_Institution

Commun. Lab., Helsinki Univ. of Technol., Espoo, Finland

Volume

3

fYear

1997

fDate

4-7 May 1997

Firstpage

2089

Abstract

A method of estimating the channel transfer function is presented for orthogonal frequency division multiplexing (OFDM) mobile communication systems working under time-variant radio channel conditions. The proposed method employs lowpass filtering in a transform domain so that intercarrier interference and additive white Gaussian noise components in the received pilot signals are significantly reduced. The cutoff frequency of the transform-domain filter is dynamically selected by tracking the received pilot signals. The channel transfer function for all the subcarriers is obtained by a high-resolution interpolation realized by zero-padding and DFT/IDFT. The proposed method is applicable for all linear modulation OFDM systems. It is demonstrated with a 16QAM-OFDM system which includes both amplitude and phase modulations

Keywords

Gaussian noise; discrete Fourier transforms; filtering theory; frequency division multiplexing; interpolation; inverse problems; land mobile radio; low-pass filters; parameter estimation; phase modulation; quadrature amplitude modulation; radiofrequency interference; time-varying channels; transfer functions; white noise; 16QAM-OFDM system; DFT/IDFT; OFDM mobile communication systems; additive white Gaussian noise; amplitude modulation; channel estimation method; channel transfer function; cutoff frequency; high-resolution interpolation; intercarrier interference; linear modulation; lowpass filtering; orthogonal frequency division multiplexing; phase modulation; pilot signals; time-variant radio channel; transform-domain filter; transform-domain processing; zero-padding; Additive white noise; Channel estimation; Cutoff frequency; Filtering; Filters; Frequency estimation; Interference; Mobile communication; OFDM; Transfer functions;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1997, IEEE 47th

Conference_Location

Phoenix, AZ

ISSN

1090-3038

Print_ISBN

0-7803-3659-3

Type

conf

DOI

10.1109/VETEC.1997.605966

Filename

605966