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2008
IEEE

Iterative Residual Frequency Offset Correction for OFDM Systems

9 years 4 months ago
Iterative Residual Frequency Offset Correction for OFDM Systems
The estimation and tracking of the fractional carrier frequency offset (CFO) is a crucial issue in the implementation of orthogonal frequency division multiplexing (OFDM) systems. In this contribution, we present a novel code-aided fractional CFO estimation algorithm based on the ExpectationMaximization (EM) algorithm. The proposed algorithm exchanges soft information from the channel decoder, in the form of a posteriori probabilities of the coded symbols, between the demapper, the decoder, and the CFO estimator in an iterative way. The proposed estimation scheme can work with any detector as long as the detector is able to compute the a posteriori probabilities (APPs) of the data symbols. Index-Terms- Orthogonal Frequency Division Multiplexing (OFDM), Carrier Frequency Offset (CFO), Coding, Expectation-Maximization (EM) algorithm.
Mohamed Marey, Mamoun Guenach, Heidi Steendam
Added 01 Jun 2010
Updated 01 Jun 2010
Type Conference
Year 2008
Where VTC
Authors Mohamed Marey, Mamoun Guenach, Heidi Steendam
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