Frequency offset estimation in OFDM systems in presence of IQ imbalance
ICCS '02 Proceedings of the The 8th International Conference on Communication Systems - Volume 01
Efficient compensation of transmitter and receiver IQ imbalance in OFDM systems
EURASIP Journal on Advances in Signal Processing
IQ-Imbalance Compensation for OFDM in the Presence of IBI and Carrier-Frequency Offset
IEEE Transactions on Signal Processing
Digital Compensation of I/Q Imbalance Effects in Space-Time Coded Transmit Diversity Systems
IEEE Transactions on Signal Processing
MIMO OFDM Receivers for Systems With IQ Imbalances
IEEE Transactions on Signal Processing
Multicarrier modulation for data transmission: an idea whose time has come
IEEE Communications Magazine
Broadband wireless access solutions based on OFDM access in IEEE 802.16
IEEE Communications Magazine
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The direct-conversion architecture is an attractive front-end design for multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. These systems are typically small in size and provide a good flexibility to support growing number of wireless standards. However, direct-conversion based OFDM systems are generally very sensitive to front-end component imperfections. These imperfections are unavoidable especially when cheaper components are used in the manufacturing process and can lead to radio frequency (RF) impairments such as in-phase/quadrature-phase (IQ) imbalance. These RF impairments can result in a severe performance degradation. In this paper, we propose training based efficient compensation schemes for MIMO OFDM systems impaired with transmitter and receiver frequency selective IQ imbalance. The proposed schemes can decouple the compensation of the transmitter and receiver IQ imbalance from the compensation of the channel distortion. It is shown that the proposed schemes result in an overall lower training overhead and a lower computational requirement as compared to a joint estimation/compensation of IQ imbalance and the channel distortion.