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...

• Type: Conference
• Year: 2006
• Where: GLOBECOM
• Authors: Xiaoyu Fu, Hlaing Minn, Cyrus D. Cantrell
• Keywords: Estimation Performance, GLOBECOM 2006, SAGE Method, Telecommunications , first Proposed Method