Code-aided channel tracking for OFDM

Conference: TURBO - CODING - 2006 - 4th International Symposium on Turbo Codes & Related Topics; 6th International ITG-Conference on Source and Channel Coding
04/03/2006 - 04/07/2006 at Munich, Germany

Proceedings: TURBO - CODING - 2006

Pages: 6Language: englishTyp: PDF

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Wymeersch, Henk; Simoens, Frederik; Steendam, Heidi; Moeneclaey, Marc (Department of Telecommunications and Information Processing Ghent University, St.-Pietersnieuwstraat 41, 9000 Gent, Belgium)

This contribution deals with the problem of tracking a frequency-selective channel for OFDM systems, where the data is protected by a powerful error-correcting code. We present an EM-based receiver, operating on a single OFDM symbol at a time, that iterates between channel estimation and data detection. The channel estimator accepts information from the detector in the form of a posteriori probabilities. The estimator is robust in a sense that it makes very few assumptions regarding the underlying channel model. Complexity-reducing approximations are discussed. Performance results are provided in the form of Monte Carlo simulations.