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2006
IEEE

Two Novel Iterative Joint Frequency-Offset and Channel Estimation Methods for OFDMA Uplink

10 years 1 months ago
Two Novel Iterative Joint Frequency-Offset and Channel Estimation Methods for OFDMA Uplink
—We address joint estimation of frequency offsets and channel responses in OFDMA uplink. A cyclically equal-spaced, equal-energy interleaved pilot preamble is proposed by which two iterative estimators are developed. In the first estimator, we develop a modified SAGE (space alternating generalized expectation-maximization) method by incorporating multiuser interference cancellation in both time and frequency domains into the SAGE method. The proposed modified SAGE method yields a faster convergence rate, a better estimation performance, and a lower complexity than the existing conventional SAGE method from [10]. In the second method, we propose a very low complexity ad-hoc method to replace the high complexity frequency offset estimator of the first method. The proposed adhoc method is developed based on the time-domain characteristics of the pilot preamble and the frequency-domain power concentration property of OFDMA systems. It achieves almost the same estimation performance a...
Xiaoyu Fu, Hlaing Minn, Cyrus D. Cantrell
Added 11 Jun 2010
Updated 11 Jun 2010
Type Conference
Year 2006
Where GLOBECOM
Authors Xiaoyu Fu, Hlaing Minn, Cyrus D. Cantrell
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