Doppler spread estimation for nonRayleigh fading channel

Author

Yuan, Gao ; Wei, Chen ; Tao, Xie ; Biqi, Long

Author_Institution

Sch. of Inf. Eng., Wuhan Univ. of Technol., Wuhan, China

fYear

2009

fDate

25-27 May 2009

Firstpage

1106

Lastpage

1109

Abstract

A method for estimating the Doppler spread in mobile orthogonal frequency division multiplexing (OFDM) systems is described. The estimation is based on phase message of time domain channel estimation over several OFDM symbols. In OFDM systems, channel estimation is popularly performed in frequency domain. Channel frequency response estimates are affected by noise and inter-carrier interference (ICI). As a result, Doppler estimation is useful to improve CIR performance. In this paper, methods of partial maximal path and path tracing have been presented. Furthermore estimation bias is analyzed and error correcting modified method is advised to reduce estimation precision. All of these measures improve the estimator and the performance can not be influenced by signal-to-noise ratio (SNR). The algorithm is verified with digital terrestrial multimedia broadcast (DTMB) platform and simulation results show good estimation performance. In addition, this estimator is of robust in a wide range of Doppler spread and SNR.

Keywords

Doppler effect; OFDM modulation; broadcast channels; channel estimation; fading channels; frequency response; frequency-domain analysis; intercarrier interference; mobile radio; multimedia communication; multipath channels; time-domain analysis; time-varying channels; DTMB; Doppler spread estimation; OFDM; SNR; digital terrestrial multimedia broadcast platform; frequency domain channel estimation; intercarrier interference; mobile orthogonal frequency division multiplexing system; multipath time-variant fading channel; nonRayleigh fading channel; partial maximal path method; path tracing method; signal-to-noise ratio; time-domain channel frequency response estimation; Channel estimation; Error analysis; Error correction; Fading; Frequency domain analysis; Frequency estimation; Frequency response; Interference; OFDM; Phase estimation; Doppler spread estimation; nonRayleigh channel; phase-varying;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics and Applications, 2009. ICIEA 2009. 4th IEEE Conference on

Conference_Location

Xi´an

Print_ISBN

978-1-4244-2799-4

Electronic_ISBN

978-1-4244-2800-7

Type

conf

DOI

10.1109/ICIEA.2009.5138373

Filename

5138373