Performance analysis of spatial multiplexing MIMO-OFDM systems under frequency-selective I/Q imbalances

Authors:
Yaning Zou;Mikko Valkama;Markku Renfors
Affiliations:
Tampere University of Technology, Tampere, Finland;Tampere University of Technology, Tampere, Finland;Tampere University of Technology, Tampere, Finland
Venue:
Proceedings of the 2009 International Conference on Wireless Communications and Mobile Computing: Connecting the World Wirelessly
Year:
2009

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Abstract

This paper studies the impact of one important radio transceiver impairment, namely the I/Q imbalance, on the link performance of spatial multiplexing MIMO-OFDM systems. A closed-form solution for the effective signal-to-interference-plus-noise-ratio (SINR) at the input of the receiver detection stage due to frequency-selective transmitter and receiver I/Q imbalances is derived, taking also the effects of fading multipath radio channel and additive noise into account. As will be shown, the derived SINR can be directly mapped to the achievable detection error rate at high SNR regime, yielding a valuable analytical tool for radio transceiver designers to analyze the imbalance effects at link-level without any actual data simulations. The analytical outcomes are also verified using extensive computer simulations backing up the theoretical studies. In general, the obtained results indicate that I/Q imbalance can easily become a limiting factor to the achievable link performance in future spatial multiplexing MIMO-OFDM systems, and thus should be carefully mitigated using proper digital and/or analog signal processing.