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Journal papers:

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1. X. Cai, T. S. Izydorczyk, J. Rodríguez-Piñeiro, I. Z. Kovács, J. Wigard, X. Yin, F. M. L. Tavares and P. E. Mogensen, “Empirical Low-Altitude UAV Spatial Channel Modeling for Cellular Networks Connectivity,” submitted to IEEE Journal on Selected Areas in Communications, Oct. 2020. [ArXiv], [RG].

2. X. Cai, I. Kovács, J. Wigard, P.  E. Mogensen, “A Centralized and Scalable Uplink Power Control Algorithm in Low SINR: A Case Study for UAV Communications,” submitted to IEEE Transactions on Antennas and Propagation, Aug 2020. [ArXiv], [RG].

3. X. Cai, W. Fan, Y. Miao and G. F. Pedersen, “Dynamic channel emulation in a cost-effective MPAC setup for mmWave devices over-the-air testing with dominant cluster concept,” submitted to IEEE Transactions on Wireless Communications, June 2020. [ArXiv], [RG].

4. Z. Huang, J. Rodríguez-Piñeiro, T. Domínguez-Bolaño, X. Cai and X. Yin, “Experimental stochastic model of UAV propagation channels for time-evolving MPCs estimated using a novel tracking algorithm,” third-round review with IEEE Transactions on Wireless Communications, Jan. 2021.

5. A. Bharti, R. Adeogun, X. Cai, W. Fan, F. Briol, L. Clavier, T. Pedersen, “Joint modeling of received power, mean delay, and delay spread for wideband radio channels,” to appear, IEEE Transactions on Antennas and propagation, Dec. 2020. [ArXiv].

6. G. Zhang, J. O. Nielsen, X. Cai*(Corresponding Author), S. Kentaro, P. Hanpinitsak, J. Takada, G. F. Pedersen, and W. Fan, “Modeling Multi-frequency Characteristics for Classroom and Hall Scenarios at 2-4, 9-11 and 27-29 GHz Bands,” to appear; IEEE Access, Jan. 2021. 

7. J. Rodríguez-Piñeiro, Z. Huang, X. Cai, T. Domínguez-Bolaño and X. Yin, “Geometry-based MPC tracking and modeling algorithm for time-varying UAV channels,” IEEE Transactions on Wireless Communications (early access), Nov. 2020. [VBN], [IEEE Xplore]

8. X. Cai, G. Zhang, C. Zhang, W. Fan, J. Li and G. F. Pedersen, “Dynamic channel modeling for indoor millimeter-wave propagation channels based on measurements,” IEEE Transactions on Communications, vol. 68, no. 9, pp. 5878-5891, Sept. 2020. [RG], [IEEE Xplore].

9. X. Cai, W. Fan, X. Yin, and G. F. Pedersen, “Trajectory-aided maximum-likelihood algorithm for channel parameter estimation in ultra-wideband large-scale arrays,” IEEE Transactions on Antennas and Propagation, vol. 68, no. 10, pp. 7131-7143, Oct. 2020. [RG], [IEEE Xplore].

10. J. Rodríguez-Piñeiro, T. Domínguez-Bolaño, X. Cai*(Corresponding Author), Z. Huang and X. Yin, “Air-to-ground channel characterization for low-height UAVs in realistic network deployments,” IEEE Transactions on Antennas and Propagation, pp. 1-15, 2020. [RG], [IEEE Xplore]. 

11. A. W. Mbugua, W. Fan, K. Olesen, X. Cai, and G. F. Pedersen, “Phase compensated fiber optic based ultra-wideband channel sounder”, IEEE Transactions on Microwave Theory and Techniques,” vol. 68, no. 2, pp. 636-647, Feb. 2020. [RG], [IEEE Xplore]. 

12. A. Mbugua, W. Fan, X. Cai, Y. Chen, W. Wang, K. Olesen, G. F. Pedersen, “System development and experimental validation of a long range ultra-wideband channel sounder,” IET Microwaves, Antennas & Propagation, May 2020. [VBN].

13. X. Cai, C. Zhang, J. R. Piñeiro, X. Yin, W. Fan, and G. F. Pedersen, “Interference modeling for low-height air-to-ground channels in live LTE networks,” IEEE Antennas Wireless Propagation Letters, vol. 18, no. 10, pp. 2011-2015, Oct. 2019. [IEEE Xplore].

14. X. Cai, and W. Fan, “A complexity-efficient high resolution parameter estimation algorithm for ultra-wideband large-scale uniform circular array,” IEEE Transactions on Communications, vol. 67, no. 8, pp. 5862-5874, Aug. 2019. [RG], [IEEE Xplore].

15. X. Cai, J. Rodríguez-Piñeiro, X. Yin, N. Wang, B. Ai, G. F. Pedersen, and A. P. Yuste, “An empirical air-to-ground channel model based on passive measurements in LTE,” IEEE Transactions on Vehicular Technology, vol. 68, no. 2, pp. 1140–1154, Feb 2019. [RG], [IEEE Xplore]. 

16. X. Cai, B. Peng, X. Yin, and A. P. Yuste, “Hough-transform-based cluster identification and modelling for V2V channels based on measurements,” IEEE Transactions on Vehicular Technology, vol. 67, no. 5, pp. 3838–3852, May 2018. [RG], [IEEE Xplore]. 

17. G. Zhang, K. Saito, W. Fan, X. Cai, P. Hanpinitsak, J. Takada, and G. F. Pedersen, “Experimental characterization of millimeter-wave indoor propagation channels at 28 GHz,” IEEE Access, vol. 6, pp. 76516-76526, Nov 2018. [RG], [IEEE Xplore].

18. J. Chen, X. Yin, X. Cai, and S. Wang, “Measurement-based massive MIMO channel modelling for outdoor LoS and NLoS environments,” IEEE Access, vol. 5, pp. 2126-2140, 2017. [RG], [IEEE Xplore].

19. X. Ye, X. Yin, X. Cai, and A. P. Yuste, “Neural-network-assisted UE localization using radio-channel fingerprints in LTE Networks,” IEEE Access, vol. 5, pp. 12071-12087, 2017. [RG], [IEEE Xplore].

20. X. Cai, X. Yin, X. Cheng, and A. P. Yuste, “An empirical random-cluster model for subway channels based on passive measurements in UMTS,” IEEE Transactions on Communications, vol. 64, no. 8, pp. 3563–3575, Aug. 2016. [RG], [IEEE Xplore].

21. X. Yin, M. Tian, L. Ouyang, X. Cheng, X. Cai, L. Tian, J. Chen, and P. Yang, “Modelling city-canyon pedestrian radio channels based on passive sounding in in-service networks,” IEEE Transactions on Vehicular Technology, vol. 65, no. 10, pp. 7931–7943, Oct. 2016. [IEEE Xplore].

22. X. Yin, X. Cai, X. Cheng, J. Chen, and M. Tian, “Empirical geometry-based random-cluster model for high-speed-train channels in UMTS networks,” IEEE Transactions on Intelligent Transportation Systems, vol. 16, no. 5, pp. 2850–2861, Oct. 2015. [RG], [IEEE Xplore]. 

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Conference papers:

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1. G. Zhang, X. Cai, W. Fan, G. F. Pedersen, “A USRP-based channel sounder for UAV communications,” in European Conference on Antennas and Propagation (EuCAP), April 2020, pp. 1–4. 

2. Le Hao, J. R. Piñeiro, X. Cai, et. al, “Measurement-based Double-Directional Polarimetric Characterization of Outdoor Massive MIMO Propagation Channels at 3.5GHz,” in International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), April 2020, pp. 1–5. 

3. X. Cai, N. Wang, J. Rodríguez-Piñeiro, X. Yin, A. P. Yuste, W. Fan, G. Zhang, G. F. Pedersen, and L. Tian, “Low altitude air-to-ground channel characterization in LTE network,” in European Conference on Antennas and Propagation (EuCAP), 2019, pp. 1–5.

4. W. Fan, A. W. Mbugua, X. Cai, and K. Olesen, “Development and experimental validation of an ultra-wideband channel sounder,” in European Conference on Antennas and Propagation (EuCAP), 2019, pp. 1–5.

5. N. Wang, X. Yin, X. Cai, J. Rodríguez-Piñeiro, A. P. Yuste, and L. Tian, “A novel air-to-ground channel modeling method based on graph model,” in European Conference on Antennas and Propagation (EuCAP), 2019, pp. 1–5. 

6. G. Zhang, P. Hanpinitsak, X. Cai, W. Fan, K. Saito, J. Takada, and G. F. Pedersen, “Millimeter-wave channel characterization in large hall scenario at the 10 and 28 GHz bands,” in 2019 13th European Conference on Antennas and Propagation (EuCAP), 2019, pp. 1–4. 

7. N. Wang, X. Yin, X. Cai, A. P. Yuste, and Y. Hu, “A sea-wave-dynamics monitoring radar based on propagation characteristics of echo signals,” in Antennas and Propagation (EuCAP), European Conference on, April 2018, pp. 1-5.  

8. C. Zhang, X. Yin, X. Cai,  and Z. Yu, “Wideband 39 GHz millimeter-wave channel measurements under diversified vegetation,” in International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), September 2018, pp. 1-6. 

9. X. Cai, A. G. Plaza, D. Alonso, L. Zhang, C. B. Rodríguez, A. P. Yuste, and X. Yin, “Low altitude UAV propagation channel modelling,” in European Conference on Antennas and Propagation (EuCAP), Mar 2017, pp. 1-5. 

10. X. Ye, X. Cai, X. Yin, J. R. Piñeiro, L. Tian, and J. Dou, “Air-to-ground big-data-assisted channel modelling based on passive sounding in LTE networks,” IEEE Globecom Workshops (GC Wkshps) on, November 2017, pp. 1-1.         

11. X. Ye, X. Cai, Y. Shen, X. Yin, and X. Cheng, “A geometry-based path loss model for high-speed-train environments in LTE-A networks,” in International Conference on Computing, Networking and Communications (ICNC), Feb 2016, pp. 1–6. 

12. X. Ye, X. Cai, H. Wang and X. Yin, “Tunnel and non-tunnel channel characterization for high-speed-train scenarios in LTE-A networks,” IEEE 83rd Vehicular Technology Conference (VTC Spring) on, May 2016, pp. 1-5. 

13. X. Cai, X. Yin, and A. P. Yuste., “Direction-of-arrival estimation using single antenna in high-speed-train environments,” in European Conference on Antennas and Propagation (EuCAP), April 2016, pp. 1-4. 

14. X. Cai, X. Yin, Y. He, W. Duan, and S. R. Boque, “Measurement-based stochastic models for channel transition in underground subway environments,” in European Conference on Antennas and Propagation (EuCAP), April 2015, pp. 1–5. 

15. N. Zhang, X. Yin, S. X. Lu, M. Du, and X. Cai, “Measurement-based angular characterization for 72 GHz propagation channels in indoor environments,” IEEE Globecom Workshops (GC Wkshps) on, December 2014, pp. 370-376.

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Book chapters: 

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1. X. Cai, C. Zhang, W. Fan, “High-Density Channels,” Wiley 5G Ref, May 2020. 

2. H. Wang, X. Yin, X. Cai, H. Wang, Z. Yu and J. Lee, “Fading characterization of 73 GHz millimeter-wave V2V channel based on real measurements,” Communication Technologies for Vehicles, Springer, 2018. 

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Patent: 

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1. L. Ouyang, X. Cai, X. Yin, “基于多普勒信道特性的天线辐射方向图自适应方法 (Self-adaption method of antenna radiation pattern based on Doppler characteristics),” China, ZL201510563057.7, 2018.

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3GPP contribution: ​

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1. 3GPP, R1-1720572, “Field measurement results for LTE aerials,” ZTE, Sanechips, Tongji University, 2017.

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