D. Hu, Y. Zhang, L. He, and J. Wu, “Low-Complexity Deep-Learning-Based DOA Estimation for Hybrid Massive MIMO Systems with Uniform Circular Arrays,” IEEE Wireless Communications Letters, to be published, 2020.

D. Hu, W. Zhang, L. He, and J. Wu, “Secure Transmission in Multi-cell Multi-user Massive MIMO Systems with an Active Eavesdropper,” IEEE Wireless Communications Letters, vol. 8, no. 1. pp. 85-88, 2019.

D. Hu, L. He, and J. Wu, “A Novel Forward-Link Multiplexed Scheme in Satellite-Based Internet of Things,” IEEE Internet of Things Journal, vol. 5, no. 2, pp. 1265-1274, Apr. 2018.

D. Hu and L. He, “Channel Estimation for FDD Massive MIMO OFDM Systems,” in Proc. IEEE VTC 2017-Fall. Toronto, Canada, Sep. 24-27, 2017-September: 1-5.

D. Hu, L. He, and X. Wang, “Semi-blind Pilot Decontamination for Massive MIMO Systems,” IEEE Trans. Wireless Communications, vol. 15, no. 1, pp. 525-536, 2016.

D. Hu, X. Wang, and L. He, “A New Sparse Channel Estimationand Tracking Method for Time-Varying OFDM Systems,” IEEE Trans.Vehicular Technology, vol. 62, no. 9, pp. 4648-4653, 2013.

D. Hu, L. He, and X. Wang, “An Efficient Pilot DesignMethod for OFDM-BasedCognitive Radio Systems,” IEEE Trans. Wireless Communications, vol. 10, no. 4, pp. 1252-1259, 2011.

D. Hu and L. He, “Pilot Design for Channel Estimation in OFDM-based Cognitive Radio Systems,” in Proc. IEEE Globecom2010. Miami, USA, Dec. 6-9, 2010.

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