Journal Papers

[J35] S. Ryu, H. Lee, and J. Choi*, “Software-Defined Digital Radar: Flexible Design and Field Verification with PMCW Waveform,” IEEE Internet of Things Journal, Early Access (IF: 8.9, 4.1% JCR’24) [IEEEXplore]

[J34] Y. Ha, H. An, W.-H. Lee, and J. Choi*, “3-D Localization of Wi-Fi APs and BLE Beacons With Interfloor Path Loss in Multifloor Buildings,” IEEE Transactions on Instrumentation and Measurement, vol. 75, pp. 1-15, Jan. 2026 (IF: 5.9, 8.2% JCR’24) [IEEEXplore]

[J33] Y. Shin, S. Shin, J. Lee, J. Kim, M. Na, J. Lee, and J. Choi*, “SDR-Based Portable Channel Sounding System for 6G FR1 and FR3 Bands: Design and Validation,” IEEE Open Journal of the Communication Society, vol. 6, pp. 10,802-10,815, Dec. 2025 (IF: 6.1, Q1, JCR’24) [IEEEXplore]

[J32] H. An, Y. Ha, J. Song and J. Choi*, “Crowdsourced 3-D Wi-Fi AP Localization in Multifloor Buildings via Vertical Transitions,” IEEE Internet of Things Journal, vol. 12, no. 22, pp. 48,621-48,636, Nov. 2025 (IF: 8.9, 4.1% JCR’24) [IEEEXplore]

[J31] Y. Shin, S. Shin, H. Gu, S. K. Yoo and J. Choi*, “Transformer-Based Prediction and Synthesis of Generative Channel for Orientation-Aware Beamforming,” IEEE Wireless Communications Letters, vol. 14, no. 10, pp. 3139-3143, Oct. 2025 (IF: 5.5, Q1, JCR’24) [IEEEXplore]

[J30] J.-H. Park, D. Ham, J. Choi, S. Lee and S.-C. Kim, “Compressive Sensing-Based Demultiplexing of Fast-Time CDM-MIMO PMCW Radar Signals for Self-Code Interference Cancellation,” in IEEE Internet of Things Journal, vol. 12, no. 14, pp. 28,060-28,073, Jul. 2025 (IF: 8.9, 4.1% JCR’24) [IEEEXplore]

[J29] M. Na, J. Lee, G. Choi, T. Yu, J. Choi, J. Lee, S. Bahk, “Operator’s Perspective on 6G: 6G Services, Vision, and Spectrum,” IEEE Communications Magazine, vol. 62, no. 8, pp. 178-184, Aug. 2024 (IF: 8.3, 5.5% JCR’23) [IEEEXplore]

[J28] S. Lim, J. Jung, E. Lee, J. Choi, and S.-C. Kim, “In-Vehicle Passenger Occupancy Detection Using 60 GHz FMCW Radar Sensor,” IEEE Internet of Things Journal, vol. 11, no. 4, pp. 7002-7012, Feb. 2024 (IF: 10.6, 2.2% JCR’22) [IEEEXplore]

[J27] E. Lee, K.-M. Park, B.-h. Lee, S.-C. Kim, and J. Choi*, “CNN-Based Real-Time Walking Direction Estimation for Pedestrian Navigation Scenario,” IEEE Sensors Journal, vol. 24, no. 1, pp. 1042-1050, Jan. 2024 (IF: 4.3, Q1, JCR’22) [IEEEXplore]

[J26] K.-M. Park, B.-h. Lee, E. Lee, S.-C. Kim and J. Choi*, “GPS-Aided Automatic Site Survey Method for WiFi RTT-Based Positioning,” IEEE Transactions on Vehicular Technology, vol. 72, no. 10, pp. 13120-13129, Oct. 2023 (IF: 6.239, Q1, JCR’21) [IEEEXplore]

[J25] J. Choi*, “Automatic Site Survey for RSS-Based Wi-Fi Positioning Using Unlabeled Data,” IEEE Transactions on Vehicular Technology, vol. 72, no. 8, pp. 11,063-11,067, Aug. 2023 (IF: 6.239, Q1, JCR’21) [IEEEXplore]

[J24] K.-M. Park, E. Lee, J. Choi, and S.-C. Kim “Automated Site Survey for Fingerprints in Fully-Blind Indoor Environments Based on Sensor Integration,” IEEE Sensors Letters, vol. 7, no. 1, Jan. 2023 [IEEEXplore]

[J23] S. Lim, J. Jung, B.-h Lee, J. Choi, and S.-C. Kim “Radar Sensor Based Estimation of Vehicle Orientation for Autonomous Driving,” IEEE Sensors Journal, vol. 22, no. 22, pp. 21924-21932, Nov. 2022 [IEEEXplore]

[J22] J. Choi*, “Sensor-Aided Learning for Wi-Fi Positioning with Beacon Channel State Information,” IEEE Transactions on Wireless Communications, vol. 21, no. 7, pp. 5251-5264, July 2022 (IF:7.016, <8% JCR’20) [Paper] [IEEEXplore] [Demo Video]

[J21] J. Song, J.-H. Lee, S. Noh, and J. Choi, “Millimeter Wave Reflection Pattern Codebook Design for RIS-Assisted V2V Communications,” IEEE Transactions on Vehicular Technology, vol. 71, no. 6, pp. 6819-6824, June 2022 (IF:5.978, Q1, JCR’20) [IEEEXplore]

[J20] J. Song, S.-H. Hyun, J.-H. Lee, J. Choi, and S.-C. Kim, “Joint Vehicle Tracking and RSU Selection for V2I Communications with Extended Kalman Filter,” IEEE Transactions on Vehicular Technology, vol. 71, no. 5, pp. 5609-5614, May 2022 (IF:5.978, Q1, JCR’20) [Paper] [IEEEXplore]

[J19] J. Choi*, “Enhanced Wi-Fi RTT Ranging: A Sensor-Aided Learning Approach,” IEEE Transactions on Vehicular Technology, vol. 71, no. 4, pp. 4428-4437, Apr. 2022 (IF:5.978, Q1, JCR’20) [Paper] [IEEEXplore]

[J18] B.-h. Lee, D. Ham, J. Choi, S.-C. Kim, and Y.-H. Kim, “Genetic Algorithm for Path Loss Model Selection in Signal Strength Based Indoor Localization,” IEEE Sensors Journal, vol. 21, no. 21, pp. 24285-24296, Nov. 2021 (IF:3.301, JCR’20) [IEEEXplore]

[J17] J. Choi* and Y.-S. Choi, “Calibration-Free Positioning Technique Using Wi-Fi Ranging and Built-In Sensors of Mobile Devices,” IEEE Internet of Things Journal, vol. 8, no. 1, pp. 541-554, Jan. 2021 (IF:9.936, <2% JCR’20) [Paper] [IEEEXplore] [Demo Video]

[J16] F. Potorti et al. (incl. J. Choi), “The IPIN 2019 Indoor Localisation Competition-Description and Results,” IEEE Access, vol. 8, pp. 206674-206718, Nov. 2020 [Paper] [IEEEXplore]

[J15] J. Choi*, Y.-S. Choi, and S. Talwar, “Unsupervised Learning Techniques for Trilateration: From Theory to Android App Implementation,” IEEE Access, vol. 7, pp. 134525-134528, Sept. 2019 [Paper] [IEEEXplore & Demo Video]

[J14] J.-H. Lee, J. Choi, W.-H. Lee, and J. Song, “Array Pattern Synthesis Using Semidefinite Programming and a Bisection Method,” ETRI Journal, vol. 41, no. 5, pp. 619-625, May 2019

[J13] J.-H. Lee, J. Choi, W.-H. Lee, and J. Song, “Exploiting Array Pattern Synthesis for Physical Layer Security in Millimeter Wave Channels,” Electronics, vol. 8, no. 7, p. 745, July 2019

[J12] V.-H. Nguyen, M.-T. Nguyen, J. Choi, and Y.-H. Kim, “NLOS Identification in WLANs Using Deep LSTM with CNN Features,” Sensors, vol. 18, no. 11, p. 4057, Nov. 2018

[J11] J. Yoon, O. Jo, J.-W. Choi, S. Lee, J. Choi, and S.-C. Kim, “SNR Analysis and Estimation for Efficient Phase Noise Mitigation in Millimetre-Wave SC-FDE Systems,” IET Communications, vol. 12, no. 18, pp. 2347-2356, Nov. 2018

[J10] J. Choi, W.-H. Lee, J.-H. Lee, J.-H. Lee, and S.-C. Kim, “Deep Learning Based NLOS Identification with Commodity WLAN Devices,” IEEE Transactions on Vehicular Technology, vol. 67, no. 4, pp. 3295-3303, Apr. 2018 (IF:4.432, <8% JCR’18) [Paper] [IEEEXplore]

[J9] J.-H. Lee, J. Choi, J.-Y. Lee, and S.-C. Kim, “28 GHz Millimeter-Wave Channel Models in Urban Microcell Environment Using Three-Dimensional Ray Tracing,” IEEE Antennas and Wireless Propagation Letters, vol. 17, no. 3, pp. 426-429, Mar. 2018 [IEEEXplore]

[J8] J.-H. Lee, J. Choi, and S.-C. Kim, “Cell Coverage Analysis of 28 GHz Millimeter Wave in Urban Microcell Environment Using 3-D Ray Tracing,” IEEE Transactions on Antennas and Propagation, vol. 66, no. 3, pp. 1479-1487, Mar. 2018 [IEEEXplore]

[J7] W.-H. Lee, J. Choi, Y.-H. Kim, J.-H. Lee, and S.-C. Kim, “Adaptive Sector Coloring Game for Geometric Network Information-Based Inter-Cell Interference Coordination in Wireless Cellular Networks,” IEEE/ACM Transactions on Networking, vol 26, no. 1, pp. 288-301, Feb. 2018

[J6] W.-T. Yu, J. Choi, W.-H. Lee, and S.-C. Kim, “Relay-Assisted Load Balancing Scheme Based on Practical Throughput Estimation,” IEICE Transactions on Communications, vol. E101.B, no. 1, pp. 242-252, Jan. 2018

[J5] W.-H. Lee, J. Choi, W.-T. Yu, J.-H. Lee, and S.-C. Kim, “Asymmetric Transmission Game for Interference Coordination in Wireless Ad-Hoc Relay Networks,” IEICE Transactions on Communications, vol. E100.B, no. 5, pp. 826-836, May 2017

[J4] J.-H. Lee, J. Choi, W.-H. Lee, J.-W. Choi, and S.-C. Kim, “Measurement and Analysis on Land-to-Ship Offshore Wireless Channel in 2.4 GHz,” IEEE Wireless Communications Letters, vol. 6, no. 2, pp. 222-225, Apr. 2017

[J3] W.-H. Lee, J. Choi, J.-H. Lee, Y.-H. Kim, and S.-C. Kim, “Distributed Power Control-Based Connectivity Reconstruction Game in Wireless Localization,” IEEE Communications Letters, vol. 21, no. 2, pp. 334-337, Feb. 2017

[J2] J. Choi, W.-H. Lee, Y.-H. Kim, J.-H. Lee, and S.-C. Kim, “Throughput Estimation Based Distributed Base Station Selection in Heterogeneous Networks,” IEEE Transactions on Wireless Communications, vol. 14, no. 11, pp. 6137-6149, Nov. 2015 (IF:2.925, <10% JCR’15) [IEEEXplore]

[J1] J. Choi, Y.-H. Kim, J.-H. Lee, S. Bahk, and S.-C. Kim, “User Throughput Estimation for the PF Scheduling Algorithm under MIMO Channel Environments,” IEEE Wireless Communication Letters, vol. 1, no. 5, pp. 528-531, Oct. 2012

(Bold face: Lab members, J. Choi* : Corresponding author)

Book Chapter

[B1] J. Choi, Y.-S. Choi, and S. Talwar, “Localization with Wi-Fi Ranging and Built-in Sensors: Self-Learning Techniques”, in Machine Learning for Indoor Localization and Navigation, S. Tiku and S. Pasricha, Springer, 2023, pp101-130 [Springer]

Conference Papers

[C12] Y. Ha, H. An, J. Lee, J. Kim, and J. Choi, “Scalable Positioning via One-Way Ranging: Beyond Wi-Fi FTM in Dense Environments,” IEEE Consumer Communications & Networking Conference (CCNC), Las Vegas, NV, USA, 2026 [IEEExplore]

[C11] J. Lee, J. Kim, Y. Shin, J. Choi, J. Lee, and M. Na, “Comparative Analysis of Pathloss at 28 GHz and 140 GHz Frequencies in Identical Environment,” IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Valencia, Spain, 2024 [IEEEXplore]

[C10] H. An, H. Gu, S. Joo, and, J. Choi, “Crowdsourced Wi-Fi Access Point Localization using Vertical Movement Detection,” 13th International Conference on Indoor Positioning and Indoor Navigation (IPIN), Nuremberg, Germany, 2023 [IEEEXplore]

[C9] S. Lim, J. Jung, J. Kim, S.-C. Kim, and J. Choi, “Enhanced Velocity Estimation Based on Joint Doppler Frequency and Range Rate Measurements,” International Conference on Ubiquitous and Future Networks (ICUFN), Barcelona, Spain, 2022 [IEEEXplore]

[C8] J. Choi, Y.-S. Choi, and S. Talwar, “Unsupervised Learning Technique to Obtain the Coordinates of Wi-Fi Access Points,” International Conference on Indoor Positioning and Indoor Navigation (IPIN), Pisa, Italy, 2019 (Winner of smartphone-based positioning competition)[IEEEXplore] [Competition Results]

[C7] J. Choi, J. Bai, S.-P. Yeh, Y.-S. Choi, and S. Talwar, “Full-Duplex Self-Backhaul Small Cell: Capacity Gain and Traffic Adaptation,” IEEE International Conference on Communications Workshops (ICC Workshops), Kensas City, MO, USA, 2018

[C6] J.-H. Lee, J. Choi, J.-Y. Lee, and S.-C. Kim, “Experimental Results of a Land-to-Ship Propagation Channel Using a Wideband Channel Sounding System at 2.4 GHz,” International Conference on Computing, Networking and Communications (ICNC), Maui, HI, USA, 2018

[C5] J.-H. Lee, J. Choi, J.-Y. Lee, and S.-C. Kim, “Permittivity Effect of Building Materials on 28 GHz mmWave Channel Using 3D Ray Tracing Simulation,” IEEE Global Communications Conference (GLOBECOM), Singapore, 2017

[C4] J. Choi, W.-H. Lee, Y. Kim, and S.-C. Kim, “Dynamic User Association and eICIC Management in Heterogeneous Cellular Networks,” IEEE International Conference on Communications (ICC), Kuala Lumpur, Malaysia, 2016

[C3] J.-H. Lee, J. Choi, and S.-C. Kim, “Internodal Distance Distribution and Wireless Link Analysis in Uniform Finite Random Network,” IEEE Vehicular Technology Society Asia Pacific Wireless Communications Symposium (APWCS), Ping Tung, Taiwan, 2014

[C2] W.-T. Yu, J. Choi, and S.-C. Kim, “Relay-Assisted Dynamic Load Balancing Scheme in Multi-Cell Cellular Networks,” IEEE Vehicular Technology Conference (VTC), Seoul, South Korea, 2014

[C1] J. Choi, J.-W. Choi, and S.-C. Kim, “An Improved Throughput Estimation Method and Dynamic User Association in Multi-Cell Networks,” IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), London, UK, 2013

Patents

[P9] J. S. Choi, S. H. Ryu, H. J. Lee, Electronic Apparatus for Simultaneous Range and Velocity Estimation of PMCW Radar Using Doppler Compensation, and Operating Method Thereof, (South Korea) KR 10-2025-0194810, Dec. 2025 (Filed)

[P8] J. H. Lee, M. S. Na, K. P. Lee, G. W. Choi, J. S. Choi, J. Y. Lee, Terminal Device and Beam Tracking Method, (South Korea) KR 10-2024-0020506, Feb. 2024 (Filed)

[P7] J. H. Lee, M. S. Na, K. P. Lee, G. W. Choi, J. S. Choi, J. Y. Lee, Terminal Device and Optimal Beam Selecting Method, (South Korea) KR 10-2024-002282, Feb. 2024 (Filed)

[P6] S. C. Kim, E. J. Lee, and J. S. Choi, Method of Estimating Heading Offset for Pedestrian Dead Reckoning and Appratus for the Same, (South Korea) 10-2833506, July 2025 (Granted)

[P5] M. R. Akdeniz et al. (incl. J. Choi), Systems and Methods for Distributed Learning for Wireless Edge Dynamics, (PCT) PCT/US2020/067068, Dec. 2020 (Filed)

[P3] J. Choi and Y.-S. Choi, Parameter Update for Range-Based Positioning, (United States) US 11,778,584, Oct. 2023 (Granted), (Brazil) BR 10 2020 019659 6, Sept. 2020 (Filed), (Germany) DE 10 2020 127974.4, Oct. 2020 (Filed)

[P2] J. Choi, V. N. Ekambaram, and Y.-S. Choi, Machine Learning Techniques for Precise Position Determination, (United States) US 11,887,007, Jan 2024 (Granted), (Europe) 20 214 977.9, Dec. 2020 (Filed)

[P1] S.-C. Kim and J. Choi, Method and Apparatus for Estimating Long-Term Transfer Rate of Terminal, (South Korea) KR 10-1452589, Oct. 2014 (Granted), (United States) US 16/424,945, Sept. 2015 (Granted)