Doppler Spread Estimation Method for OFDM Signal Using Mean Square of Channel Impulse Response's Time Derivative

Gagik MKRTCHYAN  Katsuhiro NAITO  Kazuo MORI  Hideo KOBAYASHI  

IEICE TRANSACTIONS on Communications   Vol.E89-B   No.10   pp.2961-2966
Publication Date: 2006/10/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.10.2961
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Antennas and Propagation
Doppler spread,  OFDM,  time varying multipath fading channel,  

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Many applications of OFDM systems require Doppler spread estimation. This is quite difficult in multi-path fading channels with no strong direct path. This letter proposes a novel Doppler spread estimation method, which uses the mean square (MS) value of channel impulse response's time derivative. The proposed method is very simple compared with the previously proposed methods. Simulation results show that it allows easy and precise Doppler spread calculation for OFDM by using the channel estimation based on either pilot tones or pilot symbols.