Books

1. Thomas L. Marzetta, Erik G. Larsson, Hong Yang, and Hien Quoc Ngo, Fundamentals of Massive MIMO. Cambridge, UK: Cambridge University Press, 2016.

Chapters in Books

1. K. Dovelos, S. D. Assimonis, H. Q. Ngo, and M. Matthaiou, IRS in the Near-Field: From Basic Principles to Optimal Design, in Intelligent Reconfigurable Surfaces (IRS) for Prospective 6G Wireless Networks, John Wiley & Sons, Inc., 2022.

2. Hien Quoc Ngo, Massive MIMO, in 5G and Beyond: Fundamentals and Standards (Xingqin Lin, Namyoon Lee, Eds.), Springer, 2021. 

3. Trinh Van Chien and Hien Quoc Ngo, Massive MIMO Channels, in Antenna and Propagation for 5G and Beyond, IET Publishers, 2020. 

4. Hien Quoc Ngo, "Massive MIMO Fundamentals," Wiley 5G Ref, Wiley 2019.

5. Hien Quoc Ngo, "Cell-Free Massive MIMO," in Encyclopedia of Wireless Networks, Springer, 2018.

6. Tiep Minh Hoang, Hien Quoc Ngo, and Trung Q. Duong, “Security for Cell-free Massive MIMO Networks,” in Ultra-Dense Networks for 5G and Beyond: Modelling, Analysis and Design, Wiley, 2018.

7. Tan Tai Do,  Hien Quoc Ngo,  and Trung Q. Duong, "Physical Layer Security for Massive MIMO with Anti-Jamming," in Trusted Communications with Physical Layer Security for 5G and Beyond (T. Q. Duong, X. Zhou, and H. V. Poor, Eds.), London, UK: IET Publisher, 2017.

Journals

1. James A. C. Sutton, Hien Quoc Ngo, and Michail Matthaiou, “I/Q Imbalance Compensation in Cell-Free Massive MIMO during Uplink Transmission,” IEEE Internets of Things Journal, Feb 2024, accepted.

2. C. Hao, T. T. Vu, H. Q. Ngo, M. N. Dao, X. Dang, and M. Matthaiou, “Joint User Association and Power Control for Cell-Free Massive MIMO,” IEEE Internets of Things Journal, Jan 2024, accepted.

3. M. Elfiatoure, M. Mohammadali, H. Q. Ngo, P. J. Smith, and M. Matthaiou, “Protecting massive MIMO-radar coexistence: Precoding design and power control,” IEEE Open Journal of the Communications Society, 2024.

4. Anastasios Papazafeiropoulos, Hien Quoc Ngo, Pandelis Kourtessis, Symeon Chatzinotas, "STAR-RIS Assisted Cell-Free Massive MIMO System Under Spatially-Correlated Channels," IEEE Transactions on Vehicular Technology, Oct 2023, accepted.

5. K. Dovelos, S. D. Assimonis, H. Q. Ngo, and M. Matthaiou, “Superdirective antenna pairs for energy-efficient terahertz massive MIMO,” IEEE Transactions on Communications, Aug 2023, accepted. 

6. T. V. Chien, L. Cuong, H. T. Binh, H. Q. Ngo, and S. Chatzinotas, “Phase Shift Design for RIS-Aided Cell-Free Massive MIMO with Improved Differential Evolution,” IEEE Wireless Communications Letters, May 2023, accepted.

7. M. Mohammadali, T. T. Vu, H. Q. Ngo, and M. Matthaiou, “Network-assisted full-duplex cell-free massive MIMO: Spectral and energy efficiencies,” IEEE Journal on Selected Areas in Communications, April 2023, accepted.

8. M. Mohammadali, H. Q. Ngo, and M. Matthaiou, “Cell-free massive MIMO with OTFS modulation: Statistical CSI-based detection,” IEEE Wireless Communications Letters, March 2023, accepted.

9. Zhe Wang, Jiayi Zhang, Hien Quoc Ngo, Bo Ai, and Merouane Debbah, “Uplink precoding design for cell-free massive MIMO with iteratively weighted MMSE,” IEEE Transactions on Communications, Dec. 2022, accepted

10. Tung T. Vu, Hien Quoc Ngo, Minh N. Dao, Duy T. Ngo, Erik G. Larsson, and Tho Le-Ngoc, “Energy-Efficient Massive MIMO for Federated Learning: Transmission Designs and Resource Allocations,” IEEE Open Journal of the Communications Society, Nov. 2022, accepted.

11. Nhan Thanh Nguyen, Van-Dinh Nguyen, Hieu Van Nguyen, Hien Quoc Ngo, Symeon Chatzinotas, Markku Juntti, “Spectral efficiency analysis of hybrid relay-reflecting intelligent surface-assisted cell-free massive MIMO systems,” IEEE Transactions on Wireless Communications, Oct. 2022, accepted. 

12. M. Mohammadali, H. Q. Ngo, and M. Matthaiou, “Cell-free massive MIMO meets OTFS modulation,” IEEE Transactions on Communications, Sept 2022, accepted.

13. Junjuan Feng, Hien Quoc Ngo, and Michalis Matthaiou, “(Non)-coherent MU-MIMO block fading channels with finite blocklength and linear processing,” IEEE Transactions on Wireless Communications, Sept. 2022, accepted.

14. Muhammad Farooq, Hien Quoc Ngo, and Le-Nam Tran, "Mirror Prox Algorithm for Large-Scale Cell-Free Massive MIMO Uplink Power Control," IEEE Commun. Lett., Sept. 2022, accepted.

15. Hoang D. Tuan, Ali A. Nasir, Hien Quoc Ngo, Eryk Dutkiewicz, and H. Vincent Poor, "Scalable User Rate and Energy-Efficiency Optimization in Cell-Free Massive MIMO," IEEE Transaction on Communications, July 2022, accepted.

16. Tung T. Vu, Duy T. Ngo, Nguyen H. Tran, Hien Quoc Ngo, Minh N. Dao, and Richard H. Middleton, "Joint Resource Allocation to Minimize Execution Time of Federated Learning in Cell-Free Massive MIMO", IEEE Internets of Things Journal, June 2022, accepted. 

17. Jianhe Du, Siyu Ye, Libiao Jin, Xingwang Li, Hien Quoc Ngo, and Octavia A. Dobre, “Tensor-based Joint Channel Estimation for Multi-way Massive MIMO Hybrid Relay Systems,” IEEE Transactions on Vehicular Technology, June 2022, accepted., 

18. Tung T. Vu, Hien Quoc Ngo, Minh N. Dao, Michail Matthaiou, and Erik G. Larsson, “Data size-aware downlink massive MIMO: Session-based approach,” IEEE Wireless Communications Letters, May 2022, accepted.

19. The Khai Nguyen, Ha H. Nguyen, Hoang D. Tuan, and Hien Quoc Ngo, "Improved Pilot Designs for Enhancing Connectivity in Multicarrier Massive MIMO Systems," IEEE Wireless Communications Letters, Feb 2022, accepted.

20. Trang C. Mai, Hien Quoc Ngo, Le-Nam Tran, "Energy Efficiency Maximization in Large-Scale Cell-Free Massive MIMO: A Projected Gradient Approach," IEEE Transactions on Wireless Communications, Feb 2022, accepted.

21. Trang C. Mai, Hien Quoc Ngo, and Le-Nam Tran, “Energy-efficient power allocation in cell-free massive MIMO with zero-forcing: First-order methods,” Physical Communication, Volume 51, 2022.

22. Trinh Van Chien, Hien Quoc Ngo, Symeon Chatzinotas, and Björn Ottersten, "Reconfigurable Intelligent Surface-Assisted Massive MIMO: Favorable Propagation, Channel Hardening, and Rank Deficiency," IEEE Signal Processing Magazine, Nov 2021 (Accepted).

23. Trinh Van Chien, Hien Quoc Ngo, Symeon Chatzinotas, Marco Di Renzo, and Björn Ottersten, "Reconfigurable Intelligent Surface-Assisted Cell-Free Massive MIMO Systems Over Spatially-Correlated Channels," IEEE Transactions on Wireless Communications, Dec 2021, accepted.

24. Trinh Van Chien, Hien Quoc Ngo, Symeon Chatzinotas, Björn Ottersten, and Merouane Debbah, "Uplink Power Control in Massive MIMO with Double Scattering Channels," IEEE Transactions on Wireless Communications, August 2021, accepted.

25. Muhammad Farooq, Hien Quoc Ngo, Een-Kee Hong, Le-Nam Tran, "Utility Maximization for Large-Scale Cell-Free Massive MIMO Downlink," IEEE Trans. Commun., July 2021, accepted.

26. Chung Duc Ho, Hien Quoc Ngo, and Michail Matthaiou, "Transmission Schemes and Power Allocation for Multiuser Massive MIMO Relaying," IEEE Transactions on Vehicular Technology, July 2021, accepted.

27. Tien Hoa Nguyen, Trinh Van Chien, Hien Quoc Ngo, Xuan Nam Tran, and Emil Björnson, "Pilot Assignment for Joint Uplink-Downlink Spectral Efficiency Enhancement in Massive MIMO Systems with Spatial Correlation," IEEE Transactions on Vehicular Technology, June 2021, accepted.

28.  Lei Zhang, Simon L. Cotton, Seong Ki Yoo, Hien Quoc Ngo, Marta Fernández, and William G. Scanlon, “A Time Series-Based Study of Correlation, Channel Power Imbalance, and Diversity Gain in Indoor-Distributed Antenna Systems at 60 GHz,” IEEE Transactions on Antennas and Propagation, May 2021.

29.  A. A. Nasir, H. D. Tuan, H. Q. Ngo, T. Q. Duong, and H. V. Poor, “Cell-Free Massive MIMO in the Short Blocklength Regime for URLLC,” IEEE Transactions on Wireless Communications, March 2021, accepted.

30. J. A. C. Sutton, H. Q. Ngo, and M. Matthaiou, “Hardening the channels by precoder design in massive MIMO with multiple-antenna users,” IEEE Transactions on Vehicular Technology, March 2021, accepted.

31. K. Dovelos, M. Matthaiou, H. Q. Ngo, and B. Bellalta, “Channel estimation and hybrid combining for wideband terahertz massive MIMO systems,” IEEE Journal on Selected Areas in Communications, March 2021, accepted.

32. A. Papazafeiropoulos, H. Q. Ngo, P. Kourtessis, S. Chatzinotas, and J. M. Senior, "Towards Optimal Energy Efficiency in Cell-Free Massive MIMO Systems," IEEE Transactions on Green Communications and Networking, Feb 2021, accepted.

33. L. Du, L. Li, H. Q. Ngo, T. C. Mai, and M. Matthaiou, “Cell-free massive MIMO: Joint maximum-ratio and zero-forcing precoder with power control,” IEEE Transactions on Communications, Jan 2021, accepted.

34. Giovanni Interdonato, Hien Quoc Ngo, and Erik G. Larsson, “Enhanced Normalized Conjugate Beamforming for Cell-Free Massive MIMO,” IEEE Transactions on Communications, January 2021, Early Access.

35. Shih-Kai Chou, Okan Yurduseven, Hien Quoc Ngo, Michail Matthaiou, “On the aperture efficiency of intelligent reflecting surfaces,” IEEE Wireless Communications Letters, Nov 2020, accepted.

36. Mohammadali Mohammadi, Batu K. Chalise, Himal A. Suraweera, Hien Quoc Ngo, and Zhiguo Ding, “Design and analysis of full-duplex massive antenna array systems based on wireless power transfer,” IEEE Transactions on Communications, October 2020, accepted.

37. Weiyang Xu, Chang Yuan, Shengbo Xu, Hien Quoc Ngo, Wei Xiang, “On Pilot Spoofing Attack in Massive MIMO Systems: Detection and Countermeasure,” IEEE Transactions on Information Forensics & Security, October 2020, accepted.

38. Michail Matthaiou, Okan Yurduseven, Hien Quoc Ngo, David Morales-Jimenez, Simon L. Cotton, and Vincent F. Fusco, “The road to 6G: Ten physical layer challenges for communications engineers,” IEEE Communications Magazine, September 2020, accepted.

39. Manijeh Bashar, Hien Quoc Ngo, Kanapathippillai Cumanan, Alister G. Burr, Pei Xiao, Emil Björnson, and Erik G. Larsson, "Uplink Spectral and Energy Efficiency of Cell-Free Massive MIMO with Optimal Uniform Quantization," IEEE Transactions on Communications, September 2020, accepted.

40. Tung T. Vu, Duy T. Ngo, Nguyen H. Tran, Hien Quoc Ngo, Minh N. Dao, and Richard H. Middleton, “Cell-Free Massive MIMO for Wireless Federated Learning,” IEEE Transactions on Wireless Communications, June 2020, accepted.

41. X. You, C. Wang, and X. Shen, etc.,"Towards 6G Wireless Communication Networks: Vision, Enabling Technologies, and New Paradigm Shifts", Science China Information Sciences (SCIS), June 2020, accepted.

42. Jide Yuan, Hien Quoc Ngo, and Michail Matthaiou, “Towards large intelligent surface (LIS)-based communications,” IEEE Transactions on Communications, July 2020, accepted. 

43. Chung D. Ho, Hien Quoc Ngo, and Michail Matthaiou, “Pilot assignment and power allocation for multipair massive MIMO relaying networks,” IEEE Transactions on Vehicular Technology, April 2020, accepted.

44. Trang C. Mai, Hien Quoc Ngo, and Trung Q. Duong, Downlink Spectral Efficiency of Cell-Free Massive MIMO Systems with Multi-antenna Users, IEEE Transactions on Communications, April 2020, accepted.

45. Huiqiang Xie, Weiyang Xu, Hien Quoc Ngo, Bing Li, “Non-coherent massive MIMO systems: A constellation design approach,” IEEE Transactions on Wireless Communications, March 2020, accepted.

46. Thien Van Luong, Youngwook Ko, Ngo Anh Vien, Michail Matthaiou, and Hien Quoc Ngo, “Deep energy autoencoder for noncoherent multicarrier MU-SIMO systems,” IEEE Transactions on Wireless Communications, Feb 2020, accepted.

47. Manijeh Bashar, Ali Akbari, Kanapathippillai Cumanan, Hien Quoc Ngo, Alister G. Burr, Pei Xiao, Merouane Debbah, and Josef Kittler, “Exploiting deep learning in limited-fronthaul cell-free massive MIMO uplink,” IEEE Journal on Selected Areas in Communications, February 2020, accepted.

48. Jide Yuan, Hien Quoc Ngo, and Michail Matthaiou, “Machine learning-based channel prediction in massive MIMO with channel aging,” IEEE Transactions on Wireless Communications, January 2020, accepted.

49. Son Dinh, Hien Quoc Ngo, Simon Cotton, “Wireless Powered Wearables using Distributed Massive MIMO,” IEEE Transactions on Communications, December 2019, accepted.

50. Manijeh Bashar , Kanapathippillai Cumanan , Alister G. Burr, Hien Quoc Ngo, Lajos Hanzo, and Pei Xiao, “On the Performance of Cell-Free Massive MIMO Relying on Adaptive NOMA/OMA Mode-Switching,” IEEE Transactions on Communications, November 2019, accepted.

51. Giovanni Interdonato, Hien Quoc Ngo, Pål Frenger, and Erik G. Larsson, “Downlink Training in Cell-Free Massive MIMO: A Blessing in Disguise,” IEEE Transactions on Wireless Communications, vol. 18, no. 11, pp. 5153-5169, November 2019.

52. Manijeh Bashar, Kanapathippillai Cumanan, Alister G. Burr, Hien Quoc Ngo, Erik G. Larsson, and Pei Xiao, “Energy efficiency of the cell-free Mmassive MIMO uplink with optimal uniform quantization,” IEEE Transactions on Green Communications and Networking, July 2019, accepted.

53. Manijeh Bashar, Kanapathippillai Cumanan, Alister G. Burr, Hien Quoc Ngo, Merouane Debbah, and Pei Xiao, "Max-Min Rate of Cell-Free Massive MIMO Uplink with Optimal Uniform Quantization," IEEE Transactions on Communications, July 2019, accepted.

54. Giovanni Interdonato, Emil Björnson, Hien Quoc Ngo, Pål Frenger, Erik G. Larsson, “Ubiquitous Cell-Free Massive MIMO Communications,” EURASIP Journal on Wireless Communications and Networking, June 2019, accepted.

55. Manijeh Bashar, Kanapathippillai Cumanan, Alister G. Burr, Merouane Debbah, and Hien Quoc Ngo, "On the Uplink Max-Min SINR of Cell-Free Massive MIMO Systems," IEEE Transactions on Wireless Communications, vol. 18, no. 4, pp. 2021 - 2036, April 2019.

56. Hayder Al-Hraishawi, Gayan Amarasuriya Aruma Baduge, Hien Quoc Ngo,  and Erik G. Larsson, "Multi-Cell Massive MIMO Uplink with Underlay Spectrum Sharing," IEEE Transactions on Cognitive Communications and Networking, vol. 5, no. 1, pp. 119-137, March 2019.

57. Michail Matthaiou, Peter J. Smith, Hien Quoc Ngo, Harsh Tataria, "Does massive MIMO fail in Ricean channels," IEEE Wireless Communications Letters,  vol. 8, no. 1, pp. 61-64, Feb. 2019.

58. Milad Fozooni, Hien Quoc Ngo, Michai Matthaiou, Shi Jin, and George C. Alexandropoulos, “Hybrid processing design for multipair massive MIMO relaying with channel spatial correlation,” IEEE Transactions on Communications, vol. 67, no. 1, pp. 107-123, Jan. 2019.

59. Trang C. Mai, Hien Quoc Ngo, Malcolm Egan, and Trung Q. Duong, “Pilot Power Control for Cell-free Massive MIMO,” IEEE Transaction on Vehicular Technology, vol. 67, no. 11, pp. 11264-1268, Nov. 2018..

60. Erik G. Larsson, Thomas L. Marzetta, Hien Quoc Ngo, and Hong Yang, “Antenna Count for Massive MIMO: 1.9 GHz versus 60 GHz,” IEEE Communications Magazine, vol. 56, no. 9, pp. 132-137, Sept. 2018.

61. Chung Duc Ho, Hien Quoc Ngo, Michail Matthaiou, and Long D. Nguyen, "Power Allocation for Multi-Way Massive MIMO Relaying," IEEE Transactions on Communications, vol. 66, no. 10, pp. 4457-4472, Oct. 2018.

62. Tiep Minh Hoang, Hien Quoc Ngo, Trung Q. Duong, Hoang D. Tuan, and Alan Marshall, “Cell-free Massive MIMO Networks: Optimal Power Control against Active Eavesdropping,” IEEE Transactions on Communications, vol. 66, no. 10, pp. 4724-4737, Oct. 2018.

63. Manijeh Bashar, Kanapathippillai Cumanan, Alister G. Burr, Hien Quoc Ngo, and H. Vincent Poor, "Mixed Quality of Service in Cell-Free Massive MIMO,"  IEEE Communications Letters,  March 2018, vol. 22, no. 7, pp. 1494-1497, July 2018.

64. Nam  Phong Nguyen, Hien Quoc Ngo, Trung Q. Duong, Hoang Duong Tuan, and Kamel Tourki, "Secure Massive MIMO with the Artificial Noise-Aided Downlink Training," IEEE Journal on Selected Areas in Communications, January 2018, vol. 36, no. 4, pp. 802-816, April 2018.

65. Hien Quoc Ngo, Le Nam Tran, Trung Q. Duong, Michail Matthaiou, and E. G. Larsson, "On the total energy efficiency of cell-free massive MIMO," IEEE Transactions on Green Communications and Networking, vol. 2, no. 1, pp. 25-39, March 2018.

66. Toan X. Doan, Hien Quoc Ngo, Trung Q. Duong, and Kamel Tourki, "On the performance of multigroup multicast cell-free massive MIMO," IEEE Communications Letters, vol. 21, no. 12, pp. 2642-2645, December 2017.

67. Nam  Phong Nguyen, Hien Quoc Ngo, Trung Q. Duong, Hoang Duong Tuan, and Daniel B. da Costa, “Full-duplex cyber-weapon with massive arrays,” IEEE Transactions on Communications, vol. 65, no. 12, pp. 5544-5558, December 2017.

68. Long D. Nguyen, Trung Q. Duong, Hien Quoc Ngo, and Kamel Tourki, “Energy efficiency in cell-free massive MIMO with zero-forcing precoding design,” IEEE Communications Letters,  vol. 21, no. 8, pp. 1871-1874, August 2017.

69. Hien Quoc Ngo and Erik G. Larsson, “No downlink pilots are needed in Massive MIMO,” IEEE Transactions on Communications, vol. 16, no.5, pp. 2921 – 2935, May 2017.

70. Chung Duc Ho, Hien Quoc Ngo, Michail Matthaiou, and Trung Q. Duong, "On the performance of zero-forcing processing in multi-way massive MIMO relay networks,"  IEEE Communications Letters, vol. 21, no.4,  pp. 849–852, April 2017.

71. Anastasios K. Papazafeiropoulos, Hien Quoc Ngo, Tharm Ratnarajah, “Performance of massive MIMO uplink with zero-forcing receivers under delayed channels,” IEEE Transactions on Vehicular Technology, vol. 66, no. 4, pp. 3158-3169, April 2017.

72. Toan X. Doan, Tiep M. Hoang, Trung Q. Duong, and Hien Quoc Ngo, “Energy Harvesting-Based D2D Networks in the Presence of Interference and Ambient RF Sources,” IEEE Access, Special Issue, vol. 5, no. 3, pp. 5224 – 5234, March 2017.

73. Tan Tai Do, Hien Quoc Ngo, Trung Q. Duong, Tobias J. Oechtering, and Mikael Skoglund, “Massive MIMO pilot retransmission strategies for robustification against jamming,” IEEE Wireless Communications Letters, vol. 6, no. 1,  pp. 58 –61, February 2017.

74. Hien Quoc Ngo, Alexei Ashikhmin, Hong Yang, Erik G. Larsson, and Thomas L. Marzetta, “Cell-free Massive MIMO versus small cells,” IEEE Transactions on Wireless Communications, vol. 16, no.3,  pp. 1834 – 1850, March 2017. (Web of Science Highly Cited Paper) 

75. Lifeng Wang, Hien Quoc Ngo, Maged Elkashlan, Trung Q. Duong, and Kai-Kit Wong, “Massive MIMO in spectrum sharing networks: Achievable rate and power efficiency,” IEEE Systems Journal, Special Issue on '5G Wireless Systems with Massive MIMO', vol. 11, no. 1, pp. 20-31, March 2017.

76. Nam-Phong Nguyen, Trung Q. Duong, Hien Quoc Ngo, Zoran Hadzi-Velkov, and Lei Shu, “Secure 5G wireless communications: A joint relay selection and wireless power transfer approach,” IEEE Access, vol. 4,  pp. 3349–3359, June 2016.

77. Nam-Phong Nguyen, Chinmoy Kundu, Hien Quoc Ngo, Trung Q. Duong, and Berk Canberk, “Secure full-duplex small-cell networks in a spectrum sharing environment,” IEEE Access, vol. 4,  pp. 3087–3099, June 2016.

78. Hien Quoc Ngo, Michail Matthaiou, and Erik G. Larsson, “Correction to 'Massive MIMO With Optimal Power and Training Duration Allocation',” IEEE Wireless Communications Letters, vol. 4, no. 2, pp. 225-225, April 2015. 

79. Hien Quoc Ngo, Michail Matthaiou, and Erik G. Larsson, “Massive MIMO with optimal power and training duration allocation,” IEEE Wireless Communications Letters, vol. 3, no. 6, pp. 605-608, December 2014. (The correction can be found here.)

80. Hien Quoc Ngo, Himal A. Suraweera, Michail Matthaiou, and Erik G. Larsson, “Multipair full-duplex relaying with massive arrays and linear processing,” IEEE Journal on Selected Areas in Communications, vol. 32, no. 9, pp. 1721-1737, October 2014. (2017 IEEE Leonard G. Abraham Prize), (Web of Science Highly Cited Paper) 

81. Hien Quoc Ngo and Erik G. Larsson, “Large-scale multipair two-way relay networks with distributed AF beamforming,” IEEE Communications Letters, vol. 17, no. 12, pp. 2288-2291, Dec. 2013.

82. Hien Quoc Ngo, Michail Matthaiou, Trung Q. Duong, and Erik G. Larsson, “Uplink performance analysis of multicell MU-SIMO systems with ZF receivers,” IEEE Transactions on Vehicular Technology, vol. 62, no. 9, pp. 4471-4483, November 2013. 

83. Hien Quoc Ngo, Erik G. Larsson, and Thomas L. Marzetta, “The multicell multiuser MIMO uplink with very large antenna arrays and a finite-dimensional channel,” IEEE Transactions on Communications, vol. 61, no. 6, pp. 2350-2361, June 2013. 

84. Hien Quoc Ngo, Erik G. Larsson, and Thomas L. Marzetta, “Energy and spectral efficiency of very large multiuser MIMO systems,” IEEE Transactions on Communications, vol. 61, no. 4, pp. 1436-1449, April 2013. (2015 IEEE Stephen O. Rice Prize in Communications Theory, IEEE Sweden VT-COM-IT Joint Chapter Best Student Journal Paper Award), (Web of Science Highly Cited Paper) . 

85. Michail Matthaiou, George C. Alexandropoulos, Hien Quoc Ngo, and Erik G. Larsson, “Analytic framework for the effective rate of MISO fading channels,” IEEE Transactions on Communications, vol. 60, no. 6, pp. 1741-1751, June 2012. 

86. Hien Quoc Ngo and Erik G. Larsson, “Linear multihop amplify-and-forward relay channels: Error exponent and optimal number of hops,” IEEE Transactions on Wireless Communications, vol. 10, no. 11, pp. 3834-3842, November 2011. 

87. Hien Quoc Ngo, Tony Q. S. Quek, and Hyundong Shin, “Amplify-and-forward two-way relay networks: Error exponents and resource allocation,” IEEE Transactions on Communications, vol. 58, no. 9, pp. 2653-2666, September 2010.

88. Hien Quoc Ngo, Tony Q. S. Quek, and Hyundong Shin, “Random coding error exponent for dual-hop Nakagami-m fading channels with amplify-and-forward relaying,” IEEE Communications Letters, vol. 13, no. 11, pp. 823-825, November 2009. 

89. Bappi Barua, Hien Quoc Ngo, and Hyundong Shin, “On the SEP of cooperative diversity with opportunistic relaying,” IEEE Communications Letters, vol. 12, no. 10, pp. 727-729, October 2008. 

Conferences

1. Y. S. Atiya, Z. Mobini, H. Q. Ngo, and M. Matthaiou, “Joint power optimization and AP selection for secure cell-free massive MIMO,” in Proc. IEEE Wireless Communications and Networking Conference (WCNC), April 2024.

2. Trinh Van Chien, Ha An Le, Hien Quoc Ngo, and  Symeon Chatzinotas, "Uplink Sum Throughput Analysis and Maximization for Integrated Satellite-Terrestrial Cell-Free Massive MIMO," IEEE Global Communications Conference (IEEE GLOBECOM) 2023.

3. B. Liao, H. Q. Ngo, M. Matthaiou, and P. J. Smith, “Low-complexity transmit beamforming design for massive MIMO-ISAC systems,” IEEE Global Communications Conference (GLOBECOM), December 2023.

4. R. Chong, M. Mohammadi, H. Q. Ngo, S. L. Cotton, and M. Matthaiou,  “How to combine OTFS and OFDM modulations in massive MIMO?,” in Proc. IEEE Global Communications Conference (GLOBECOM), December 2023.

5. Z. Mobini, H. Q. Ngo, M. Matthaiou, and L. Hanzo, “Cell-free massive MIMO surveillance systems,” in Proc. IEEE Global Communications Conference (GLOBECOM), December 2023.

6. M. Mohammadali, L.-N. Tran, Z. Mobini, H. Q. Ngo, and M. Matthaiou,  “Cell-free massive MIMO and  SWIPT: Access point operation mode selection and power control,” in Proc. IEEE Global Communications Conference (GLOBECOM), December 2023.

7. C. Hao, T. T. Vu, H. Q. Ngo, M. N. Dao, X. Dang, and M. Matthaiou, “User association and power control in cell-free massive MIMO with the APG method,” in Proc. IEEE European Signal Processing Conference (EUSIPCO), September 2023.

8. Y. S. Atiya, Z. Mobini, H. Q. Ngo, and M. Matthaiou, “Cell-free massive MIMO with protective partial zero-forcing and active eavesdropping,” in Proc. IEEE Vehicular Technology Conference (VTC), June 2023.

9. J. Feng, H. Q. Ngo, and M. Matthaiou, “Rectangular pulse-shaped OTFS with fractional delay and Doppler shift for MU-MIMO systems,” in Proc. IEEE International Conference on Communications (ICC), May 2023.

10. Mohammadali Mohammadi, Zahra Mobini, Hien Quoc Ngo, and Michail Matthaiou, “Integration of Massive MIMO and RIS to Serve Energy and Information Users,” in Proc. IEEE International Conference on Communications (ICC), May 2023.

11. K. Dovelos, S. D. Assimonis, H. Q. Ngo, and M. Matthaiou, “Superdirective Arrays with Finite-Length Dipoles: Modeling and New Perspectives,” in Proc. IEEE Global Communications Conference (GLOBECOM), Dec. 2022.

12. L. V. Nguyen, H. Q. Ngo, L.-N. Tran, A. L. Swindlehurst, and D. H. N. Nguyen, “Variational bayes inference for data detection in cell-free massive mimo,” in Proc. Asilomar Conference on Signals, Systems and Computers (ACSSC), Pacific Grove, CA, USA, Nov. 2022.

13. M. Mohammadali, T. T. Vu, B. N. Beni, H. Q. Ngo, and M. Matthaiou, “Virtually full-duplex cell-free massive MIMO with access point mode assignment,” in Proc. IEEE International Conference on Signal Processing Advances in Wireless Communications (SPAWC), July 2022. (Invited paper).

14. T. T. Vu, T. V. Chien, C. T. Dinh, H. Q. Ngo, and M. Matthaiou, “Channel estimation in RIS-assisted downlink massive MIMO: A learning-based approach,” in Proc. IEEE International Conference on Signal Processing Advances in Wireless Communications (SPAWC), July 2022. (Invited paper).

15. Muhammad Farooq, T. T. Vu , Hien Quoc Ngo, and Le-Nam Tran, "Serving Federated Learning and Non-Federated Learning Users: A Massive MIMO Approach," in Proc. IEEE International Conference on Signal Processing Advances in Wireless Communications (SPAWC), July 2022.

16. Zhe Wang, Jiayi Zhang, Hien Quoc Ngo, Bo Ai, and Merouane Debbah, “Iteratively Weighted MMSE Uplink Precoding for Cell-Free Massive MIMO Systems,” in Proc. IEEE International Conference on Communications (ICC), May 2022.

17. Nhan T. Nguyen, V.-Dinh Nguyen, Hieu V. Nguyen, H. Q. Ngo, Symeon Chatzinotas, and Markku Juntti, “Downlink Throughput of Cell-Free Massive MIMO Systems Assisted by Hybrid Relay-Reflecting Intelligent Surfaces,” in Proc. IEEE International Conference on Communications (ICC), May 2022.

18. M. Mohammadali, H. Q. Ngo, and M. Matthaiou, “When cell-free massive MIMO meets OTFS modulation: The downlink case,” in Proc. IEEE International Conference on Communications (ICC), May 2022.

19. J. Feng, H. Q. Ngo, and M. Matthaiou, “'Concentration of Measure: Non-Asymptotic Analysis for Uplink MU-MIMO,” IEEE Wireless Communications and Networking (WCNC), Dec 2021.

20. K. Dovelos, S. D. Assimonis, H. Q. Ngo, B. Bellalta, and M. Matthaiou, “Intelligent reflecting surface-aided wideband THz communications: Modeling and analysis,” in Proc. IEEE Workshop on Smart Antennas (WSA), November 2021. (Invited paper).

21. K. Dovelos, S. D. Assimonis, H. Q. Ngo, B. Bellalta, and M. Matthaiou, “Electromagnetic modeling of holographic intelligent reflecting surfaces at terahertz bands,” in Proc. IEEE Asilomar Conference on Signals, Systems, and Computers, November 2021. (Invited paper).

22. T. T. Vu, Hien Quoc Ngo, Duy T. Ngo, Minh N Dao, Erik G. Larsson, “Energy-Efficient Massive MIMO for Serving Multiple Federated Learning Groups,” IEEE Global Communications Conference (GLOBECOM), Madrid, Spain, Dec. 2021.

23. F. Riera-Palou, G. Femenias, J. Garcıa-Morales, Hien Quoc Ngo, “Selective Infrastructure Activation in Cell-free Massive MIMO: a Two Time-scale Approach,” IEEE Global Communications Conference (GLOBECOM), Madrid, Spain, Dec. 2021.

24. T. T. Vu, Hien Quoc Ngo, Thomas L. Marzetta, and Michail Matthaiou, “How Does Cell-Free Massive MIMO Support Multiple Federated Learning Groups?,” IEEE SPAWC, Lucca, Italy, Sep. 2021 (Invited Paper).

25. J. A. C. Sutton, H. Q. Ngo, and M. Matthaiou, “Cell-free massive MIMO with multiple-antenna users under I/Q imbalance,” in Proc. European Signal Processing Conference (EUSIPCO), August 2021.

26. Tung T. Vu, Duy T. Ngo, Hien Quoc Ngo, Minh N. Dao, Nguyen H. Tran, and Richard H. Middleton, “Straggler Effect Mitigation for Federated Learning in Cell-Free Massive MIMO,” IEEE International Conference on Communications (ICC), June 2021.

27. Trinh Van Chien, Hien Quoc Ngo, Symeon Chatzinotas, Björn Ottersten, and Merouane Debbah, "Massive MIMO under Double Scattering Channels: Power Minimization and Congestion Controls," IEEE International Conference on Communications (ICC), June 2021.

28. Muhammad Farooq, Hien Quoc Ngo, and Le-Nam Tran, "A Low-Complexity Approach for Max-Min Fairness in Uplink Cell-Free Massive MIMO," IEEE VTC 2021, Helsinki, Finland, Apr. 2021.

29. Muhammad Farooq, Hien Quoc Ngo, and Le-Nam Tran, “Accelerated Projected Gradient Method for the Optimization of Cell-Free Massive MIMO Downlink,” in Proc. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Sept. 2020. 

30. Anastasios Papazafeiropoulos, Hien Quoc Ngo, Pandelis Kourtessis, Symeon Chatzinotas, and John M. Senior, “Optimal Energy Efficiency in Cell-Free Massive MIMO Systems: A Stochastic Geometry Approach,” in Proc. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Sept. 2020. 

31. Manijeh Bashar, Ali Akbari, Kanapathippillai Cumanan, Hien Quoc Ngo, Alister G. Burr, Pei Xiao, and Merouane Debbah, “Deep Learning-Aided Finite-Capacity Fronthaul Cell-Free Massive MIMO with Zero Forcing,” in Proc. IEEE International Conference on Communications (ICC), June 2020.   

32. Trinh Van Chien, Emil Björnson, and Hien Quoc Ngo, “Uplink Power Control in Cellular Massive MIMO Systems: Coping with the Congestion Issue,” IEEE ICC Workshop on Scalable Massive MIMO Technologies for beyond 5G, 2020. 

33. J. Feng, H. Q. Ngo, and M. Matthaiou, “Coherent MU-MIMO in block fading channels: A finite blocklength analysis,” in Proc. IEEE International Conference on Communications (ICC), June 2020. 

34. K. Dovelos, M. Matthaiou, H. Q. Ngo, and B. Bellalta, “Massive MIMO with multi-antenna users under jointly correlated Ricean fading,” in Proc. IEEE International Conference on Communications (ICC), June 2020.

35. Jide Yuan, Hien Quoc Ngo, and Michail Matthaiou, “Large intelligent surface (LIS)-based communications: New features and system layouts,” in Proc. IEEE International Conference on Communications (ICC), June 2020. 

36. James A. C. Sutton, Hien Quoc Ngo, and Michail Matthaiou, Performance of a Novel Maximum-Ratio Precoder in Massive MIMO with Multiple-Antenna Users, in Proc. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Sept. 2019, special session. 

37. Michail Matthaiou, Hien Quoc Ngo, Peter J. Smith, Harsh Tataria, and Shi Jin, “Massive MIMO with a Generalized Channel Model: Fundamental Aspects,” IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), July 2019.

38. Chung Duc Ho, Hien Quoc Ngo, and Michail Matthaiou, “Massive MIMO AF Relaying with Channel Estimation and Power Control Techniques,” IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), July 2019.

39. Jide Yuan, Hien Quoc Ngo, and Michail Matthaiou, “Machine Learning-Based Channel Estimation in Massive MIMO with Channel Aging,” IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), July 2019.

40. Manijeh Bashar, Kanapathippillai Cumanan, Alister G. Burr, Hien Quoc Ngo, Erik G. Larsson, and Pei Xia, “On the Energy Efficiency of Limited-Backhaul Cell-Free Massive MIMO,” IEEE International Conference on Communications (ICC), May 2019.

41. Manijeh Bashar, Kanapathippillai Cumanan, Alister G. Burr, Hien Quoc Ngo, Lajos Hanzo, and Pei Xiao, “NOMA/OMA Mode Selection-Based Cell-Free Massive MIMO,” in Proc. IEEE International Conference on Communications (ICC), May 2019.

42. Tung T. Vu, Duy T. Ngo, Hien Quoc Ngo, and Tho Le-Ngoc, “Full-Duplex Cell-Free Massive MIMO,” in Proc. IEEE International Conference on Communications (ICC), May 2019.

43. Weiyang Xu, Huiqiang Xie, and Hien Quoc Ngo, “Non-coherent Massive MIMO Systems: A Constellation Design Approach,” in Proc. IEEE International Conference on Communications (ICC), May 2019.

44. Seong Ki Yoo, Lei Zhang, Simon L. Cotton and Hien Quoc Ngo, “Distributed Antenna Systems used for Indoor UE to Access Point Communications at 60 GHz,” in Proc.  European Conference on Antennas and Propagation (EuCAP), 2019.

45. Seong Ki Yoo, Lei Zhang, Simon L. Cotton, Hien Quoc Ngo, and William G. Scanlon, “Ceiling- or Wall-Mounted Access Points: An Experimental Evaluation for Indoor Millimeter Wave Communications,” in Proc.  European Conference on Antennas and Propagation (EuCAP), 2019.

46. Trang C. Mai, Hien Quoc Ngo, and Trung Q. Duong, “Uplink Spectral Efficiency of Cell-free Massive MIMO with Multi-Antenna Users,” International Conference on Signal Processing, Telecommunications and Computing (SigTelCom),  2019.

47. Trang Cong Mai, Hien Quoc Ngo, Trung Q. Duong, Cell-Free Massive MIMO Systems with Multiple-Antenna Users, IEEE Global Conference on Signal and Information Processing (GlobalSIP), CA, USA, 2018.

48. Xingwang Li, Michail Matthaiou, Yuanwei Liu, Hien Quoc Ngo, and Lihua Li, Multi-Pair Two-Way Massive MIMO Relaying with Hardware Impairments over Rician Fading Channels, IEEE Global Communications Conference (GLOBECOM) 2018. 

49. Hong Yang, Hien Quoc Ngo, and Erik G. Larsson, Multi-Cell Massive MIMO in LoS, IEEE Global Communications Conference (GLOBECOM) 2018. 

50. Hien Quoc Ngo, Harsh Tataria, Michail Matthaiou, Shi Jin, and Erik G. Larsson, On the performance of cell-free massive MIMO in Ricean fading,  Asilomar Conference on Signals, Systems, and Computer, Parific Grove, CA, Nov. 2018 (invited paper).

51. Manijeh Bashar, Hien Quoc Ngo, Alister G. Burr, Dick Maryopi, Kanapathippillai Cumanan, and Erik G. Larsson, On the Performance of Backhaul Constrained Cell-Free Massive MIMO with Linear Receivers, Asilomar Conference on Signals, Systems, and Computer, Parific Grove, CA, Nov. 2018 (invited paper).

52. Manijeh Bashar, Kanapathippillai Cumanan, Alister G. Burr, Merouane Debbah, and Hien Quoc Ngo, “Enhanced Max-Min SINR for Uplink Cell-Free Massive MIMO Systems,” in Proc. IEEE International Conference on Communications (ICC), May 2018.

53. Manijeh Bashar, Kanapathippillai Cumanan, Alister G. Burr, Merouane Debbah, and Hien Quoc Ngo, “Cell-Free Massive MIMO with Limited Backhaul,” in Proc. IEEE International Conference on Communications (ICC), May 2018.

54. Chung D. Ho, Hien Quoc Ngo, Michail Matthaiou, and Long D. Nguyen, “How to scale up the spectral efficiency of multi-way massive MIMO relaying?,” in Proc. IEEE International Conference on Communications (ICC), May 2018.

55. H. Tataria, P. J. Smith, M. Matthaiou, H. Q. Ngo, and P. A. Dmochowski, “Revisiting MMSE combining for massive MIMO over heterogeneous propagation channels,” in Proc. IEEE International Conference on Communications (ICC), May 2018

56. Hien Quoc Ngo, Le-Nam Tran, Trung Q. Duong, Michail Matthaiou, and E. G. Larsson, “Energy Efficiency Optimization for Cell-Free Massive MIMO,” IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), July 2017.

57. Chung Duc Ho, Hien Quoc Ngo, Michail Matthaiou, and Trung Q. Duong, “Multi-Way Massive MIMO with Maximum-Ratio Processing and Imperfect CSI,” in Proc. European Signal Processing Conference (EUSIPCO), Sept. 2017.

58. Chung Duc Ho, Hien Quoc Ngo, Michail Matthaiou, and Trung Q. Duong, “Multi-way Massive MIMO Relay Networks with Maximum-Ratio Processing,” International Conference on Signal Processing, Telecommunications and Computing (SigTelCom), Jan. 2017.

59. Giovanni Interdonato, Hien Quoc Ngo, Erik G. Larsson, and Pal Frenger, “On the performance of Cell-Free Massive MIMO with short-term power constraints,” IEEE International Workshop on Computer Aided Modelling and Design of Communication Links and Networks (CAMAD)  2016.

60. Giovanni Interdonato, Hien Quoc Ngo, Erik G. Larsson, and Pal Frenger, “How much do downlink pilots improve cell-free Massive MIMO?,” IEEE Global Communications Conference (GLOBECOM) 2016.

61. Hien Quoc Ngo, Alexei Ashikhmin, Hong Yang, Erik G. Larsson, and Thomas L. Marzetta, “Cell-free Massive MIMO: Uniformly great service for everyone,” in Proc. IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Stockholm, Sweden, June 2015. 

62. Hien Quoc Ngo and Erik G. Larsson, “Blind estimation of effective downlink channel gains in Massive MIMO,” in Proc. IEEE International Conference on Acoustics, Speed and Signal Processing (ICASSP), Brisbane, Australia, April 2015. 

63. Hoc Phan, Thi My Chinh Chu, Hans-Jurgen Zepernick, Hien Quoc Ngo, “Performance of cognitive radio networks with finite buffer using multiple vacations and exhaustive service,” in Proc. International Conference on Signal Processing and Communication (ICSPCS), Gold Coast, Australia, Dec. 2014. 

64. Hien Quoc Ngo, Erik G. Larsson, and Thomas L. Marzetta, “Aspects of favorable propagation in Massive MIMO,” in Proc. European Signal Processing Conference (EUSIPCO), Lisbon, Portugal, Sept. 2014. 

65. Anastasios K. Papazafeiropoulos, Hien Quoc Ngo, Michail Matthaiou, and T. Ratnarajah, “Uplink performance of conventional and massive MIMO cellular systems with delayed CSIT,” in Proc. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Washington, D.C., Sept. 2014. 

66. Hien Quoc Ngo, Himal A. Suraweera, Michail Matthaiou, and Erik G. Larsson, “Multipair massive MIMO full-duplex relaying with MRC/MRT processing,” in Proc. IEEE International Conference on Communicatons (ICC), Sydney, Australia, June 2014. 

67. Hien Quoc Ngo, Erik G. Larsson, and Thomas L. Marzetta, “Massive MU-MIMO downlink TDD systems with linear precoding and downlink pilots,” in Proc. Allerton Conference on Communication, Control, and Computing, Urbana-Champaign, Illinois, Oct. 2013. 

68. Hien Quoc Ngo and Erik G. Larsson, “Spectral efficiency of the multi-pair two-way relay channel with massive arrays,” in Proc. Asilomar Conference on Signals, Systems, and Computer, Parific Grove, CA, Nov. 2013 (invited paper).

69. Himal A. Suraweera, Hien Quoc Ngo, Trung Q. Duong, Chau Yuen, and Erik G. Larsson, “Multi-pair amplify-and-forward relaying with very large antenna arrays,” in Proc. IEEE International Conference on Communicatons (ICC), Budapest, Hungary, June 2013. 

70. Hien Quoc Ngo, Michail Matthaiou, and Erik G. Larsson, “Performance analysis of large scale MU-MIMO with optimal linear receiver,” in Proc. IEEE Swedish Communication Technologies Workshop (Swe-CTW), 2012. 

71. Michail Matthaiou, George C. Alexandropoulos, Hien Quoc Ngo, and Erik G. Larsson, “Effective rate analysis of MISO Rician fading channels,” in Proc. IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM), Hoboken, NJ, U.S.A., June 2012. 

72. Trung Q. Duong, Hien Quoc Ngo, Hans-Jurgen Zepernick, and Arumugam Nallanathan, “Distributed space-time coding in two-way fixed gain relay networks over Nakagami-m fading,” in Proc. IEEE International Conference on Communications (ICC), Ottawa, Canada, June 2012. 

73. Hien Quoc Ngo and Erik G. Larsson, “EVD-based channel estimations for multicell multiuser MIMO with very large antenna arrays,” in Proc. IEEE International Conference on Acoustics, Speed and Signal Processing (ICASSP), Kyoto, Japan, May 2012. (proof of (11) can be found here)

74. Hien Quoc Ngo, Trung Q. Duong, and Erik G. Larsson, “Uplink performance analysis of multicell MU-MIMO with zero-forcing receivers and perfect CSI,” in Proc. IEEE Swedish Communication Technologies Workshop (Swe-CTW), Stockholm, Sweden, Oct. 2011. 

75. Hien Quoc Ngo, Erik G. Larsson, and Thomas L. Marzetta, “Uplink power efficiency of multiuser MIMO with very large antenna arrays,” in Proc. Allerton Conference on Communication, Control, and Computing, USA, Sept. 2011.

76. Hien Quoc Ngo, Thomas L. Marzetta, and Erik G. Larsson, “Analysis of the pilot contamination effect in very large multicell multiuser MIMO systems for physical channel models,” in Proc. IEEE International Conference on Acoustics, Speed and Signal Processing (ICASSP), Prague, Czech, May 2011. 

77. Hien Quoc Ngo and Hyundong Shin, “Noncooperative beamforming game on MIMO interference channels: Nash equilibrium rates,” in Proc.Conference of Korea Information and Communications Society 2009, Korea, Nov. 2009. 

78. Hien Quoc Ngo, Tony Q. S. Quek, and Hyundong Shin, “Reliable amplify-and-forward two-way relay networks,” in Proc. International Conference on Wireless Communications and Signal Processing (WCSP'09), Nanjing, China, Nov. 2009 (invited paper). 

79. Hien Quoc Ngo, Tony Q. S. Quek, and Hyundong Shin, “Amplify-and-forward two-way relay channels: Error exponents,” in Proc. IEEE International Symposium on Information Theory (ISIT'09), Seoul, Korea, June 2009.

80. Thang Van Nguyen, Hien Quoc Ngo, and Hyundong Shin, “Secrecy capacity of Nakagami-m fading channels,” in Proc. International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC) Jeju Island, Korea, July 2009. 

Monographs

1. Hien Quoc Ngo, “Massive MIMO: Fundamentals and System Designs,” Doctoral Thesis, Division for Communication Systems, Department of Electrical Engineering, Linköping University, Sweden, Mar. 2015.

2. Hien Quoc Ngo, “Performance Bounds for Very Large Multiuser MIMO Systems,” Licentiate Thesis, Division for Communication Systems, Department of Electrical Engineering, Linköping University, Sweden, Dec. 2012.

3. Hien Quoc Ngo, “Design of reliable two-way relay networks,” Master of Science Thesis, School of Electronics and Radio Engineering, Kyung Hee University, South Korea, Feb. 2010.

Patents

Alexei Ashikhmin, Hien Quoc Ngo, Hong Yang, Thomas L. Marzetta, “Pilots Assignment in Cell Free Massive MIMO Wireless Systems,” U.S. Patent, US9615384 B2, April 2017.

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