IEEE Transactions on Wireless Communications
IEEE Transactions on Wireless Communications
An I/Q imbalance estimation and compensation strategy for 3GPP LTE systems
RWS'09 Proceedings of the 4th international conference on Radio and wireless symposium
Efficient compensation of RF impairments for OFDM systems
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Blind I/Q imbalance compensation using independent component analysis in MIMO OFDM systems
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Low-complexity estimation of CFO and frequency independent I/Q mismatch for OFDM systems
EURASIP Journal on Wireless Communications and Networking
IEEE Transactions on Signal Processing
Low-complexity pilot-aided compensation for carrier frequency offset and I/Q imbalance
IEEE Transactions on Communications
Cross-Validation Estimation for Frequency-Dependent I/Q Imbalance in MIMO-OFDM Receivers
Journal of Signal Processing Systems
Kalman filtering based compensation for I/Q imbalance and CFO in time-varying MIMO OFDM systems
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
MIMO OFDM systems with digital RF impairment compensation
Signal Processing
Joint transmitter and receiver IQ imbalance estimation and compensation for OFDM systems
RWS'10 Proceedings of the 2010 IEEE conference on Radio and wireless symposium
Blind frequency-dependent I/Q imbalance compensation for direct-conversion receivers
IEEE Transactions on Wireless Communications
Independent component analysis based semi-blind I/Q imbalance compensation for MIMO OFDM systems
IEEE Transactions on Wireless Communications
Journal of Electrical and Computer Engineering - Special issue on Implementations of Signal-Processing Algorithms for OFDM Systems
Carrier Frequency Offset and I/Q Imbalance Compensation for MB-OFDM Based UWB System
Wireless Personal Communications: An International Journal
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Two types of wireless system imperfections, namely, frequency offset and in-phase/quadrature (I/Q) imbalance, are addressed in this paper. The I/Q imbalance in radio frequency (RF) direct-conversion not only introduces an unwanted in-band image interference but also degrades the accuracy of carrier estimation. Toward this end, we propose a pilot-based scheme for both frequency offset and I/Q imbalance compensation at the baseband. A low-cost nonlinear least squares (NLS) frequency estimator robust to the I/Q imbalance is developed. Also derived is an I/Q imbalance compensation structure that consists of two stages: a finite impulse response (FIR) filter that compensates the frequency dependent imbalance; and an asymmetric phase compensator that corrects the frequency independent error. The compensation coefficients are optimized by exploiting the phase rotation embedded in the pilot symbols. Both computer simulations and experiment results verify the effectiveness of the proposed scheme in various I/Q imbalance scenarios.