Title :
Exploiting error-control coding and cyclic-prefix in channel estimation for coded OFDM systems
Author :
Al-Rawi, Ghazi A. ; Al-Naffouri, Tareq Y. ; Bahai, Ahmad ; Cioffi, John
Author_Institution :
Stanford Univ., CA, USA
Abstract :
OFDM systems typically use coding and interleaving across subchannels to exploit frequency diversity on frequency-selective channels. This letter presents a low-complexity iterative algorithm for blind and semi-blind joint channel estimation and soft decoding in coded OFDM systems. The proposed algorithm takes advantage of the channel finite delay-spread constraint and the extra observation offered by the cyclic-prefix. It converges within a single OFDM symbol and, therefore, has a minimum latency.
Keywords :
OFDM modulation; adaptive equalisers; channel coding; channel estimation; decoding; delays; diversity reception; error correction codes; error statistics; fading channels; iterative methods; modulation coding; OFDM symbol; adaptive equalization; algorithm convergence; blind joint channel estimation; channel estimation; coded OFDM systems; cyclic-prefix; error-control coding; finite delay-spread constraint; interleaving; iterative detection; low-complexity iterative algorithm; modulation intersymbol; multicarrier transmission; semi-blind joint channel estimation; soft decoding; subchannel coding; AWGN; Blind equalizers; Channel estimation; Covariance matrix; Delay; Frequency diversity; Interleaved codes; Iterative algorithms; Iterative decoding; OFDM modulation;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2003.814712
