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Study of I/Q imbalances in QAM communication systems adopting multi-antenna receivers

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Abstract

This paper investigates the inphase/quadrature phase (I/Q) imbalance problem in quadrature amplitude modulation (QAM) communication systems with multi-antenna receivers. Two application scenarios are considered: adaptive beamforming and multi-user detection based on blind source separation (BSS). Our analysis illustrates that, in both scenarios, the effect of the transmitter and receiver I/Q imbalance can be mitigated through straightforward digital signal processing methods. For adaptive beamforming systems, increasing the number of receiver branches automatically suppresses the interference induced by transceiver I/Q imbalances. For the multi-user detection application, a simple alternative expression of the signal model can be adopted, which separately lists the inphase and quadrature phase components of the received signals and the source signals. As a result, the BSS estimation of all user signals can be conducted in the presence of transceiver I/Q imbalances. Simulation results confirmed the effectiveness of the presented I/Q imbalance correction techniques.

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Acknowledgments

The research presented in this paper was supported in part by the National Aeronautics Space Administration through the University of Central Florida’s NASA Florida Space Grant Consortium and Space Florida.

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  1. Department of Electrical, Computer, Software, and Systems Engineering, Embry-Riddle Aeronautical University, Daytona Beach, FL, 32114, USA

    Thomas Yang

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  1. Thomas Yang
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Correspondence to Thomas Yang.

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Yang, T. Study of I/Q imbalances in QAM communication systems adopting multi-antenna receivers. Ann. Telecommun. 71, 691–698 (2016). https://doi.org/10.1007/s12243-016-0541-8

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  • DOI: https://doi.org/10.1007/s12243-016-0541-8

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