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
收藏
页码：1200 / 1205
页数：7
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