ICTACT Journal on Communication Technology

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The Method Estimating IQ Imbalance using Signal Power Constrained Condition in OFDM System


Affiliations
1 College of Information Engineering, Wonsan Jogunsil University of Technology, Korea, Democratic People's Republic of
2 Institute of Information Science, Kim Il Sung University, Korea, Democratic People's Republic of
     

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IQI (I/Q Imbalance) is caused by I, Q path gain disagreement and quadrature phase incomplete generation △φ. IQI is parasitic noise about one frequency in LO frequency band. IQI estimation and compensating method analyzed on slow frequency fading channel and all most previous works estimate and compensate FIIQI only and it has much complexity, as adaptive and Kalman filtering is done when estimating and compensating FSIQI. We propose the method estimating and compensating method using signal energy constrained condition. In this method, FI and FS IQI are compensated simultaneously and Kalman filtering is not used. Also, the robustness to frequency selective channel is high.

Keywords

OFDM, IQ Imbalance, Frequency Fading Channel.
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  • The Method Estimating IQ Imbalance using Signal Power Constrained Condition in OFDM System

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Authors

Yong Chan Lee
College of Information Engineering, Wonsan Jogunsil University of Technology, Korea, Democratic People's Republic of
Song Chol Ho
College of Information Engineering, Wonsan Jogunsil University of Technology, Korea, Democratic People's Republic of
Won Chol Jang
Institute of Information Science, Kim Il Sung University, Korea, Democratic People's Republic of

Abstract


IQI (I/Q Imbalance) is caused by I, Q path gain disagreement and quadrature phase incomplete generation △φ. IQI is parasitic noise about one frequency in LO frequency band. IQI estimation and compensating method analyzed on slow frequency fading channel and all most previous works estimate and compensate FIIQI only and it has much complexity, as adaptive and Kalman filtering is done when estimating and compensating FSIQI. We propose the method estimating and compensating method using signal energy constrained condition. In this method, FI and FS IQI are compensated simultaneously and Kalman filtering is not used. Also, the robustness to frequency selective channel is high.

Keywords


OFDM, IQ Imbalance, Frequency Fading Channel.

References