OFDM and MC-CDMA for Broadband Multi-User Communications, WLANs and Broadcasting
OFDM and MC-CDMA for Broadband Multi-User Communications, WLANs and Broadcasting
EURASIP Journal on Wireless Communications and Networking - Multicarrier Systems
Introduction to Space-Time Wireless Communications
Introduction to Space-Time Wireless Communications
Compensation schemes and performance analysis of IQ imbalances in OFDM receivers
IEEE Transactions on Signal Processing - Part II
Digital Compensation of I/Q Imbalance Effects in Space-Time Coded Transmit Diversity Systems
IEEE Transactions on Signal Processing
Impacts of I/Q imbalance on QPSK-OFDM-QAM detection
IEEE Transactions on Consumer Electronics
IEEE Communications Magazine
A simple transmit diversity technique for wireless communications
IEEE Journal on Selected Areas in Communications
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In this paper, a novel adaptive approach based on Alamouti scheme is proposed to estimate and compensate frequency-dependent In-phase/Quadrature-phase (I/Q) imbalances in space-time coded MIMO-OFDM communication systems. The I/Q imbalances may be present at both ends of transmitter (TX) and receiver (RX). Although different methods have been proposed to utilize the Alamouti scheme in order to obtain spatial diversity in a MIMO-OFDM system, the inaccurate channel estimation caused by I/Q imbalances degrades the system performance. A new combining scheme is introduced to overcome this significant drawback by using joint estimation and compensation of the multipath fading channel and I/Q imbalances. The simulation results show that the proposed adaptive method can effectively mitigate the effect of the frequency-dependent TX and RX I/Q imbalances in the MIMO-OFDM systems.