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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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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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