Joint turbo channel estimation and data recovery in fast fading mobile coded OFDM

Orthogonal frequency division multiplexing (OFDM) system suffers extra performance degradation in fast fading channel due to intercarrier interference (ICI). Combing frequency domain equalization and bit-interleaved coded modulation (BICM), the iterative receiver is able to harvest both temporal and frequency diversity. In order to perform coherent detection and estimation, channel state information (CSI) is indispensable. Being able to accurately and effectively acquire CSI in the time-varying channel is critical. Conventional frequency domain channel estimation (CE) methods has an irreducible error floor at high normalized Doppler frequency fdTs, since ICI corrupts the orthogonality among subcarriers. Noticing the fast time-varying channel is also a source for temporal diversity, CE ought to take place in the pre-FFT time domain. Realizing channel variations in time are often a smooth one, this paper propose a time domain channel estimator using pilot symbol assisted modulation (PS...

• Type: Conference
• Year: 2008
• Where: PIMRC
• Authors: Daniel N. Liu, Michael P. Fitz
• Keywords: Communications, Doppler Frequency FdTs, Normalized Doppler Frequency, PIMRC 2008, Time-varying Channel