Training Design for Multipath Channel and Frequency-Offset Estimation in MIMO Systems
IEEE Transactions on Signal Processing
Compensation schemes and performance analysis of IQ imbalances in OFDM receivers
IEEE Transactions on Signal Processing - Part II
Optimal training design for MIMO OFDM systems in mobile wireless channels
IEEE Transactions on Signal Processing
On parameter estimation of MIMO flat-fading channels with frequency offsets
IEEE Transactions on Signal Processing
MIMO OFDM Receivers for Systems With IQ Imbalances
IEEE Transactions on Signal Processing
Simplified channel estimation for OFDM systems with multiple transmit antennas
IEEE Transactions on Wireless Communications
Compensation of IQ imbalance and phase noise in OFDM systems
IEEE Transactions on Wireless Communications
Optimal training signals for MIMO OFDM channel estimation
IEEE Transactions on Wireless Communications
IEEE Transactions on Wireless Communications
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In this paper, we study the joint estimation of inphase and quadrature-phase (I/Q) imbalance, carrier frequency offset (CFO), and channel response for multiple-input multipleoutput (MIMO) orthogonal frequency division multiplexing (OFDM) systems using training sequences. A new concept called channel residual energy (CRE) is introduced. We show that by minimizing the CRE, we can jointly estimate the I/Q imbalance and CFO without knowing the channel response. The proposed method needs only one OFDM block for training and the training symbols can be arbitrary. Moreover when the training block consists of two repeated sequences, a low complexity two-step approach is proposed to solve the joint estimation problem. Simulation results show that the mean-squared error (MSE) of the proposed method is close to the Cramer-Rao bound (CRB).