Efficient compensation of RF impairments for OFDM systems
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
IQ-Imbalance Compensation for OFDM in the Presence of IBI and Carrier-Frequency Offset
IEEE Transactions on Signal Processing
IEEE Transactions on Signal Processing
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
Impacts of I/Q imbalance on QPSK-OFDM-QAM detection
IEEE Transactions on Consumer Electronics
Broadband wireless access solutions based on OFDM access in IEEE 802.16
IEEE Communications Magazine
Decoupled compensation of IQ imbalance in MIMO OFDM systems
Signal Processing
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Radio frequency impairments such as in-phase/quadrature-phase (IQ) imbalances can result in a severe performance degradation in direct-conversion architecture-based communication systems. In this paper, we consider the case of transmitter and receiver IQ imbalance together with frequency selective channel distortion. The proposed training-based schemes can decouple the compensation of transmitter and receiver IQ imbalance from the compensation of channel distortion in an orthogonal frequency division multiplexing (OFDM) systems. The presence of frequency selective channel fading is a requirement for the estimation of IQ imbalance parameters when both transmitter/receiver IQ imbalance are present. However, the proposed schemes are equally applicable over a frequency flat/frequency selective channel when either transmitter or only receiver IQ imbalance is present. Once the transmitter and receiver IQ imbalance parameters are estimated, a standard channel equalizer can be applied to estimate/compensate for the channel distortion. The proposed schemes result in an overall lower training overhead and a lower computational requirement, compared to the joint compensation of transmitter/receiver IQ imbalance and channel distortion. Simulation results demonstrate that the proposed schemes provide a very efficient compensation with performance close to the ideal case without any IQ imbalance.