Fast communication: Joint estimation of carrier frequency offset, dc offset and I/Q imbalance for OFDM systems

Authors:
Tao Liu;Hanzhang Li
Affiliations:
Department of Communication Engineering, School of Information Engineering, University of Science and Technology Beijing, Beijing 100083, China;China Mobile Group Shandong Co., Ltd., Jinan 250100, China
Venue:
Signal Processing
Year:
2011

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Abstract

Orthogonal frequency division multiplexing (OFDM) systems with direct-conversion receiver (DCR) are vulnerable to carrier frequency offset (CFO), dc offset (DCO) and in-phase/quadrature (I/Q) imbalance. In this paper, we propose blind estimator for joint estimation of CFO, DCO and I/Q imbalance in OFDM systems with DCR. Simulation results show that performance of proposed estimator approaches Cramer-Rao lower bound (CRLB) asymptotically, which demonstrates its effectiveness.