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Joint Estimation of Carrier Frequency Offset and I/Q Imbalance in the Presence of Time-Varying DC Offset

Umut YUNUS, Hai LIN, Katsumi YAMASHITA

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Summary :

Due to the importance of maintaining the orthogonality among subcarriers, the estimation of carrier frequency offset (CFO) is a crucial issue in orthogonal frequency division multiplexing (OFDM) systems. The CFO estimation becomes complicated in OFDM direct-conversion receivers (DCRs), where additional analog impairments such as I/Q imbalance and time-varying DC offset (TV-DCO) exist. In this paper, we propose a novel joint estimation method for CFO and I/Q imbalance in the presence of TV-DCO. By using the linear property of the TV-DCO and employing a periodic pilot sequence, the desired estimates can be obtained in closed-form. Simulation results confirm the validity of the proposed method.

Publication
IEICE TRANSACTIONS on Communications Vol.E93-B No.1 pp.16-21
Publication Date
2010/01/01
Publicized
Online ISSN
1745-1345
DOI
10.1587/transcom.E93.B.16
Type of Manuscript
PAPER
Category
Transmission Systems and Transmission Equipment for Communications

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