Fundamentals of statistical signal processing: estimation theory
Fundamentals of statistical signal processing: estimation theory
RF microelectronics
RF System Design of Transceivers for Wireless Communications
RF System Design of Transceivers for Wireless Communications
Wireless Transceiver Design: Mastering the Design of Modern Wireless Equipment and Systems
Wireless Transceiver Design: Mastering the Design of Modern Wireless Equipment and Systems
Efficient compensation of RF impairments for OFDM systems
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
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
IEEE Transactions on Signal Processing
Digital Compensation of I/Q Imbalance Effects in Space-Time Coded Transmit Diversity Systems
IEEE Transactions on Signal Processing
Optimal training for MIMO frequency-selective fading channels
IEEE Transactions on Wireless Communications
Optimal training signals for MIMO OFDM channel estimation
IEEE Transactions on Wireless Communications
Joint compensation of transmitter and receiver impairments in OFDM systems
IEEE Transactions on Wireless Communications
Low-Complexity EM-based Joint Acquisition of the Carrier Frequency Offset and IQ Imbalance
IEEE Transactions on Wireless Communications
IEEE Transactions on Wireless Communications
Impacts of I/Q imbalance on QPSK-OFDM-QAM detection
IEEE Transactions on Consumer Electronics
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Multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) systems facilitate high data rate wireless communications, and require reliable channel estimates to fully materialize their advantages. The semiconductor downscaling trend has exacerbated device impairments such as inphase and quadrature (I/Q) imbalances which cause inter-carrier interferences in OFDM systems which cannot be remedied by increasing signal power. Different RF chains of MIMO branches can cause different I/Q imbalances which further complicates MIMO OFDM channel estimation. This paper proposes several pilot designs for the estimation of the combined responses of MIMO frequency-selective channels and frequency-dependent I/Q imbalances. The proposed designs require much smaller pilot overhead than the existing designs, and also provide estimation mean-squares error optimality (under white noise) and general applicability to preamble as well as pilot-data-multiplexed symbols in MIMO systems with or without null guard tones. Performance analyses and simulation results corroborate advantages of the proposed designs.