Estimation and Compensation of CFO and I/Q Imbalance in OFDM Systems Under Timing Ambiguity

被引：20

作者：

Cai, Xun ^{[1
]}

Wu, Yik-Chung ^{[1
]}

Lin, Hai ^{[2
]}

Yamashita, Katsumi ^{[2
]}

机构：

[1] Univ Hong Kong, Dept EEE, Hong Kong, Hong Kong, Peoples R China

[2] Osaka Prefecture Univ, Grad Sch Engn, Osaka 5998531, Japan

来源：

IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY | 2011年 / 60卷 / 03期

关键词：

Carrier frequency offset (CFO); channel estimation; I/Q imbalance; least-square estimation (LSE); orthogonal frequency-division multiplexing (OFDM); timing offset (TO); FREQUENCY OFFSET; CARRIER FREQUENCY; ML ESTIMATION; CHANNEL;

D O I：

10.1109/TVT.2011.2106525

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This paper proposes a joint carrier frequency offset (CFO) and In-phase/Quadrature-phase (I/Q) imbalance estimation and compensation method for orthogonal frequency-division-multiplexing (OFDM) systems under timing uncertainty. A matrix representation of the received signal with CFO, timing offset (TO), and I/Q imbalance is first derived. Then, a least-square CFO estimator robust against TO and I/Q imbalance is proposed. The Cramer-Rao bound (CRB) for CFO is also derived. With the estimated CFO and equivalent channel, a compensation method for both frequency-dependent and frequency-independent I/Q imbalances is presented. Simulation results are provided to verify the performances of the proposed methods.

引用

页码：1200 / 1205

页数：7

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