Exploiting error-control coding and cyclic-prefix in channel estimation for coded OFDM systems

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 algo...

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Veröffentlicht in:	IEEE communications letters 2003-08, Vol.7 (8), p.388-390
Hauptverfasser:	Al-Rawi, G.A., Al-Naffouri, T.Y., Bahai, A., Cioffi, J.
Format:	Artikel
Sprache:	eng
Schlagworte:	Algorithms Applied sciences AWGN Blind equalizers Blinds Channel estimation Channels Coding Coding, codes Covariance matrix Decoding Delay Detection, estimation, filtering, equalization, prediction Exact sciences and technology Frequency diversity Information, signal and communications theory Interleaved codes Iterative algorithms Iterative decoding Mathematical analysis Multiplexing OFDM modulation Orthogonal Frequency Division Multiplexing Signal and communications theory Signal, noise Symbols Telecommunications and information theory
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Beschreibung
Zusammenfassung:	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.
ISSN:	1089-7798 1558-2558
DOI:	10.1109/LCOMM.2003.814712