Papers

On-going

1. H. Lee, H. Guo, R. Bomfin, M. Chafii, S. Rangan, and J. Choi, "Grouping-Based RIS-Assisted ISAC Systems," in preparation.

2. J. Yang, H. Lee, and J. Choi, "Beam Training for RIS-Aided ISAC Systems," in preparation.

Submitted / Under revision

1. R. Bomfin, A. Rasteh, A. Bazzi, H. Guo, H. Lee, M. Mezzavilla, S. Rangan, J. Choi, and M. Chafii, "Multi-Band Channel Sensing in the Upper Mid-Band (FR3)," submitted to 2025 IEEE Global Communications Conference, May 2025. 

2. K. Park, G. Lee, H. Lee, H. Kim, and J. Choi, "Downlink Channel Estimation for mmWave Systems with Impulsive Interference,” submitted to  IEEE Wireless Communications Letters, May 2025.

3. G. Lee, I. Kim, Y. C. Eldar, A. L. Swindlehurst, H. Lee, M. Kim, and J. Choi, "Task-Based Quantization for Channel Estimation in RIS Empowered MmWave Systems,” submitted to IEEE Transactions on Communications, May 2025.

Accepted

1. J. Yang, H. Lee, and J. Choi, "Robust Transmission Design for Active RIS-Aided Systems," accepted to IEEE Transactions on Vehicular Technology, Feb. 2025. 

Published - International Journal

* indicates the joint first authors with equal contributions

1. H. Lee and J. Choi, "RIS-Enabled Cellular Systems Operated by Multiple Service Providers," in IEEE Transactions on Vehicular Technology, vol. 74, no. 2, pp. 3451-3456, Feb. 2025.

2. H. Lee, S. Moon, Y. Lee, J. Oh, J. Chung, and J. Choi, "Multi-Group Multicasting Systems Using Multiple RISs," in IEEE Transactions on Wireless Communications, vol. 23, no. 8, pp. 9488-9501, Aug. 2024.

3. G. Lee, H. Lee, D. Kim, J. Chung, A. L. Swindlehurst, and J. Choi, "Joint Downlink and Uplink Optimization for RIS-Aided FDD MIMO Communication Systems," in IEEE Transactions on Wireless Communications, vol. 23, no. 8, pp. 9059-9071, Aug. 2024.

4. G. Lee*, H. Lee*, J. Oh, J. Chung, and J. Choi, "Channel Estimation for Reconfigurable Intelligent Surface with a few Active Elements," in IEEE Transactions on Vehicular Technology, vol. 72, no. 6, pp. 8170-8174, Jun. 2023. 

5. S. Kim, H. Lee, H. Kim, Y. Choi, and J. Choi, "Complete Power Reallocation for MU-MIMO under Per-Antenna Power Constraint," in IEEE Transactions on Communications, vol. 71, no. 4, pp. 2087-2103, Apr. 2023.

6. S. Kim*, H. Lee*, J. Cha*, S. Kim, J. Park, and J. Choi, "Practical Channel Estimation and Phase Shift Design for Intelligent Reflecting Surface Empowered MIMO Systems," in IEEE Transactions on Wireless Communications, vol. 21, no. 8, pp. 6226-6241, Aug. 2022. 

7. S. Moon, H. Lee, J. Choi, and Y. Lee, "Low-Complexity Beamforming Optimization for IRS-Aided MU-MIMO Wireless Systems," in IEEE Transactions on Vehicular Technology, vol. 71, no. 5, pp. 5587-5592, May 2022.

8. H. Lee, H. Choi, H. Kim, S. Kim, C. Jang, Y. Choi, and J. Choi, "Downlink Channel Reconstruction for Spatial Multiplexing in Massive MIMO Systems," in  IEEE Transactions on Wireless Communications, Vol. 20, no. 9, pp. 6154-6166, Sep. 2021.

9. H. Kim, S. Kim, H. Lee, C. Jang, Y. Choi, and J. Choi, "Massive MIMO Channel Prediction: Kalman Filtering Vs. Machine Learning," in IEEE Transactions on Communications, vol. 69, no. 1, pp. 518-528, Jan. 2021.

Published - International Conference

1. G. Lee, H. Lee, A. L. Swindlehurst, and J. Choi, "Two-way Optimization for RIS Empowered FDD MIMO Communication Systems," in Proc. of IEEE Wireless Communications and Networking Conference (WCNC), Apr. 2024.

2. S. Kim, H. Lee, H. Kim, and J. Choi, "Multi-User Beamforming Under Per-Antenna Power Constraint," in Proc. of IEEE International Conference on Information and Communication Technology Convergence (ICTC), Oct. 2023.

3. S. Kim*, H. Lee*, J. Cha*, and J. Choi, "Channel Estimation for Intelligent Reflecting Surface Assisted MmWave Systems Using Analog Feedback," in Proc. of IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM), Jun. 2022. (* indicates the joint first authors with equal contributions)

4. S. Kim*, H. Lee*, J. Cha*, and J. Choi, "Parameter-Based Channel Estimation for Intelligent Reflecting Surface Aided MIMO Systems," in Proc. of IEEE Wireless Communications and Networking Conference (WCNC), Apr. 2022. (* indicates the joint first authors with equal contributions)

5. H. Lee, H. Choi, H. Kim, S. Kim, and J. Choi, "Downlink Channel Reconstruction for Massive MIMO Spatial Multiplexing," in Proc. of IEEE International Conference on Communications, Jun. 2021.

6. H. Kim, S. Kim, H. Lee, and J. Choi, "Massive MIMO Channel Prediction: Machine Learning Versus Kalman Filtering," in Proc. of IEEE Global Communications Conference Workshops, Dec. 2020.

7. H. Lee, S. Kim, and J. Choi, "Efficient Channel AoD/AoA Estimation Using Widebeams for Millimeter Wave MIMO Systems," in Proc. of IEEE International Workshop on Signal Processing Advances in Wireless Communications, Jul. 2019.