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Academic Papers about pCell® Technology

(Academia refers to pCell Technology as “Cell-free Massive MIMO”)

  1. A. Forenza, S. Perlman, F. Saibi, M. Di Dio, R. van der Laan and G. Caire, "Achieving large multiplexing gain in distributed antenna systems via cooperation with pCell technology," 2015 49th Asilomar Conference on Signals, Systems and Computers, 2015, pp. 286-293, doi: 10.1109/ACSSC.2015.7421132.
  2. E. Nayebi, A. Ashikhmin, T. L. Marzetta and H. Yang, "Cell-Free Massive MIMO systems," 2015 49th Asilomar Conference on Signals, Systems and Computers, 2015, pp. 695-699, doi: 10.1109/ACSSC.2015.7421222.
  3. Hu, Yeqing, et al., “Distributed FD-MIMO: Cellular Evolution for 5G and Beyond”, March 16, 2017, Samsung Research. https://arxiv.org/pdf/1704.00647.pdf
  4. E. Nayebi, A. Ashikhmin, T. L.Marzetta, H. Yang and B. D. Rao, "Precoding and Power Optimization in Cell-Free Massive MIMO Systems," in IEEE Transactions on Wireless Communications, vol. 16, no. 7, pp. 4445-4459, July 2017, doi:10.1109/TWC.2017.2698449.
  5. S. Buzzi and C. D’Andrea,"Cell-Free Massive MIMO: User-Centric Approach," in IEEE Wireless Communications Letters, vol. 6, no. 6, pp. 706-709, Dec. 2017, doi:10.1109/LWC.2017.2734893
  6. G. Caire, "On the Ergodic Rate Lower Bounds With Applications to Massive MIMO," in IEEE Transactions on Wireless Communications, vol. 17, no. 5, pp.3258-3268, May 2018, doi: 10.1109/TWC.2018.2808522. https://doi.org/10.1109/TWC.2018.2808522
  7. Ullah, S.M.S., Mahyiddin, W.A.,Zakaria, N.A. et al., "Training Size Optimization with Reduced Complexity in Cell-Free Massive MIMO System. Wireless Networks, 25, 1983–1994(2019) July 2018, https://doi.org/10.1007/s11276-018-1791-3
  8. S. Kim and B. Shim, "FDD-Based Cell-Free Massive MIMO Systems," 2018 IEEE 19th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Aug 2018, pp. 1-5, doi:10.1109/SPAWC.2018.8446023
  9. P. Parida, H. S. Dhillon and A. F. Molisch, "Downlink Performance Analysis of Cell-Free Massive MIMO with Finite Fronthaul Capacity," 2018 IEEE 88th Vehicular Technology Conference(VTC-Fall), 2018, pp. 1-6, Aug 2018, doi: 10.1109/VTCFall.2018.8690797.
  10. T. M. Hoang, H. Q. Ngo, T. Q. Duong, H. D. Tuan and A. Marshall, "Cell-Free Massive MIMO Networks: Optimal Power Control Against Active Eavesdropping," in IEEE Transactions on Communications, vol. 66, no. 10, pp. 4724-4737,Oct. 2018, doi: 10.1109/TCOMM.2018.2837132.
  11. H. Q. Ngo, H. Tataria, M. Matthaiou, S. Jin and E. G. Larsson, "On the Performance of Cell-Free Massive MIMO in Ricean Fading," 2018 52nd Asilomar Conference on Signals, Systems, and Computers, 2018, pp. 980-984, Oct 2018, doi: 10.1109/ACSSC.2018.8645336.
  12. G. Interdonato, M. Karlsson, E.Bjornson and E. G. Larsson, "Downlink Spectral Efficiency of Cell-Free Massive MIMO with Full-Pilot Zero-Forcing," 2018 IEEE Global Conference on Signal and Information Processing (GlobalSIP), Nov 2018, pp. 1003-1007, doi: 10.1109/GlobalSIP.2018.8646666.
  13. F. Riera-Palou, G. Femenias, A. G. Armada and A. Pérez-Neira, "Clustered Cell-Free Massive MIMO," 2018 IEEE Globecom Workshops (GC Wkshps), 2018, pp. 1-6, doi:10.1109/GLOCOMW.2018.8644255.
  14. Nayebi, E., “TDD Massive MIMO Systems: Channel Estimation, Power Optimization, and Access Point Location Design,” UC San Diego. ProQuest ID: Nayebi_ucsd_0033D_17034. Merritt ID: ark:/13030/m5130pwn, 2018, https://escholarship.org/uc/item/8843p6d8.
  15. Xianyu Zhang, Daoxing Guo, Kang An, “Secure communication in multigroup multicasting cell-free massive MIMO networks with active spoofing attack”, in IET Research Electronics Letters, January 2019, https://doi.org/10.1049/el.2018.7228.
  16. G. Femenias and F. Riera-Palou, "Cell-Free Millimeter-Wave Massive MIMO Systems With Limited Fronthaul Capacity," in IEEE Access, vol. 7, pp. 44596-44612, Mar 2019, doi:10.1109/ACCESS.2019.2908688.
  17. M. Attarifar, A. Abbasfar and A. Lozano, "Modified Conjugate Beamforming for Cell-Free Massive MIMO," in IEEE Wireless Communications Letters, vol. 8, no. 2, pp. 616-619, April 2019, doi: 10.1109/LWC.2018.2890470.
  18. M. Bashar, K. Cumanan, A. G. Burr, M. Debbah and H. Q. Ngo, "On the Uplink Max–Min SINR of Cell-Free Massive MIMO Systems," in IEEE Transactions on Wireless Communications, vol. 18,no. 4, pp. 2021-2036, April 2019, doi: 10.1109/TWC.2019.2892463.
  19. M. Bashar, K. Cumanan, A. G. Burr, H.Q. Ngo, L. Hanzo and P. Xiao, "NOMA/OMA Mode Selection-Based Cell-Free Massive MIMO," ICC 2019 - 2019 IEEE International Conference on Communications(ICC), May 2019, pp. 1-6, doi: 10.1109/ICC.2019.8761072.
  20. G. Interdonato, P. Frenger and E. G. Larsson, "Scalability Aspects of Cell-Free Massive MIMO," ICC 2019 -2019 IEEE International Conference on Communications (ICC), Jul 2019, pp. 1-6, doi: 10.1109/ICC.2019.8761828.
  21. R. Nikbakht and A. Lozano, "Uplink Fractional Power Control for Cell-Free Wireless Networks," ICC 2019 -2019 IEEE International Conference on Communications (ICC), Jul 2019, pp. 1-5, doi: 10.1109/ICC.2019.8761096.
  22. Palacios, Jorge Morte, "Cell-free Multi-user Massive MIMO Under Channel Non-reciprocity," July 1, 2019, Tampere University, https://urn.fi/URN:NBN:fi:tuni-201908012800
  23. D. Maryopi, M. Bashar and A. Burr, "On the Uplink Throughput of Zero Forcing in Cell-Free Massive MIMO with Coarse Quantization," in IEEE Transactions on Vehicular Technology, vol. 68, no. 7, pp. 7220-7224, July 2019, doi: 10.1109/TVT.2019.2920070.
  24. M. Bashar, K. Cumanan, A. G. Burr, H.Q. Ngo, E. G. Larsson and P. Xiao, "On the Energy Efficiency of Limited-Backhaul Cell-Free Massive MIMO," ICC 2019 - 2019 IEEE International Conference on Communications (ICC), Jul 2019, pp. 1-7, doi:10.1109/ICC.2019.8761134.
  25. J. Zhang, S. Chen, Y. Lin, J. Zheng, B. Ai and L. Hanzo, "Cell-Free Massive MIMO: A New Next-Generation Paradigm," in IEEE Access, vol. 7, pp. 99878-99888, Jul 2019, doi:10.1109/ACCESS.2019.2930208.
  26. Interdonato, G., Björnson, E., Quoc Ngo, H. et al., "Ubiquitous cell-free Massive MIMO communications," J Wireless Com Network 2019, 197 (2019), Aug 2019 https://doi.org/10.1186/s13638-019-1507-0
  27. E. Björnson and L. Sanguinetti, "A New Look at Cell-Free Massive MIMO: Making It Practical With Dynamic Cooperation," 2019 IEEE 30th Annual International Symposium on Personal, Indoorand Mobile Radio Communications (PIMRC), Sep 2019, pp. 1-6, doi:10.1109/PIMRC.2019.8904101.
  28. M. Bashar, K. Cumanan, A. G. Burr, H.Q. Ngo, M. Debbah and P. Xiao, "Max–Min Rate of Cell-Free Massive MIMO Uplink With Optimal Uniform Quantization," in IEEE Transactions on Communications, vol. 67, no. 10, pp. 6796-6815, Oct. 2019, doi:10.1109/TCOMM.2019.2926706.
  29. X. Hu, C. Zhong, X. Chen, W. Xu, H. Lin and Z. Zhang, “Cell-Free Massive MIMO Systems With Low Resolution ADCs,” in IEEE Transactions on Communications, vol. 67, no. 10, pp. 6844-6857, Oct. 2019, doi: 10.1109/TCOMM.2019.2927450.
  30. Emil Björnson, Luca Sanguinetti, Henk Wymeersch, Jakob Hoydis, Thomas L. Marzetta, “Massive MIMO is a Reality—What is Next?: Five Promising Research Directions for Antenna Arrays," Digital Signal Processing, Volume 94, Nov 2019, Pages 3-20, ISSN 1051-2004, https://doi.org/10.1016/j.dsp.2019.06.007.
  31. M. Bashar, K. Cumanan, A. G. Burr, H.Q. Ngo, E. G. Larsson and P. Xiao, "Energy Efficiency of the Cell-Free Massive MIMO Uplink With Optimal Uniform Quantization," in IEEE Transactions on Green Communications and Networking, vol. 3, no. 4, pp. 971-987, Dec. 2019, doi: 10.1109/TGCN.2019.2932071.
  32. E. Björnson and L. Sanguinetti,"Making Cell-Free Massive MIMO Competitive With MMSE Processing and Centralized Implementation," in IEEE Transactions on Wireless Communications, vol. 19,no. 1, pp. 77-90, Jan. 2020, doi: 10.1109/TWC.2019.2941478.
  33. C. D’Andrea, A. Garcia-Rodriguez, G. Geraci, L. G. Giordano and S. Buzzi, "Analysis of UAV Communications in Cell-Free Massive MIMO Systems," in IEEE Open Journal of the Communications Society, vol.1, pp. 133-147, Jan 2020, doi: 10.1109/OJCOMS.2020.2964983.
  34. Dierks, S., Kramer, G., Panzner, B. et al., "Information Rates of Precoding for Massive MIMO and Base Station Cooperation in an Indoor Scenario," J Wireless Com Network 2020, 22(2020), Jan 2020, https://doi.org/10.1186/s13638-019-1636-5.
  35. M. Bashar, K. Cumanan, A. G. Burr, H.Q. Ngo, L. Hanzo and P. Xiao, "On the Performance of Cell-Free Massive MIMO Relying on Adaptive NOMA/OMA Mode-Switching," in IEEE Transactions on Communications, vol. 68, no. 2, pp. 792-810, Feb.2020, doi: 10.1109/TCOMM.2019.2952574.
  36. A. Abdallah and M. M. Mansour, "Efficient Angle-Domain Processing for FDD-Based Cell-Free Massive MIMO Systems," in IEEE Transactions on Communications, vol. 68, no. 4, pp. 2188-2203, April 2020, doi: 10.1109/TCOMM.2020.2969351.
  37. Zhang, Peng, and Frans M. Willems. 2020. "On the Downlink Capacity of Cell-Free Massive MIMO with Constrained Fronthaul Capacity," Entropy 22, no. 4: 418, April 2020 https://doi.org/10.3390/e22040418.
  38. H. Q. Ngo, A. Ashikhmin, H. Yang, E. G. Larsson and T. L. Marzetta, "Correction to “Cell-Free Massive MIMO Versus Small Cells” [Mar 17 1834-1850]," in IEEE Transactions on Wireless Communications, vol. 19, no. 5, pp. 3623-3624, May 2020, doi: 10.1109/TWC.2020.2974209.
  39. H. Song, X. You, C. Zhang, O. Tirkkonen and C. Studer, "Minimizing Pilot Overhead in Cell-Free Massive MIMO Systems via Joint Estimation and Detection," 2020 IEEE 21st International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), May 2020, pp. 1-5, https://doi.org/10.1109/SPAWC48557.2020.9154310.
  40. S. Chen, J. Zhang, E. Björnson, J. Zhang, B. Ai, "Structured Massive Access for Scalable Cell-Free Massive MIMO Systems," June 18, 2020, doi.org/10.48550/arXiv.2006.10275.
  41. R. Nikbakht, R. Mosayebi and A. Lozano, "Uplink Fractional Power Control and Downlink Power Allocation for Cell-Free Networks," in IEEE Wireless Communications Letters, vol. 9, no. 6,pp. 774-777, June 2020, doi: 10.1109/LWC.2020.2969404.
  42. M. Attarifar, A. Abbasfar and A. Lozano, "Subset MMSE Receivers for Cell-Free Networks," in IEEETransactions on Wireless Communications, vol. 19, no. 6, pp.4183-4194, June 2020, doi: 10.1109/TWC.2020.2980820.
  43. T. X. Vu, S. Chatzinotas, S. Shahbaz Panahi and B. Ottersten, "Joint Power Allocation and Access Point Selection for Cell-free Massive MIMO," ICC 2020 - 2020 IEEE International Conference on Communications(ICC), 2020, pp. 1-6, June 2020, doi: 10.1109/ICC40277.2020.9148948.
  44. M. Bashar et al., "Deep Learning-Aided Finite-Capacity Fronthaul Cell-Free Massive MIMO with Zero Forcing," ICC2020 - 2020 IEEE International Conference on Communications (ICC),Jul 2020, pp. 1-6, doi: 10.1109/ICC40277.2020.9149210.
  45. Zeynab Khodkar, Jamshid Abouei, “Energy efficiency enhancement of cell-free massive multiple-input multiple-output network employing threshold-based beamforming”, in EmergingTelecommunications Technologies, vol 31, issue 7, July 2020, https://doi.org/10.1002/ett.4007.
  46. Yao Zhang, Meng Zhou, Haotong Cao, Yun Lin, Longxiang Yang, Hongbo Zhu, “Joint resource optimization in cell-free massive MIMO with low-resolution ADCs”, in IET Communications, vol 14, issue 12, July 2020, https://doi.org/10.1049/iet-com.2019.0865.
  47. E. Björnson and L. Sanguinetti, "Scalable Cell-Free Massive MIMO Systems," in IEEETransactions on Communications, vol. 68, no. 7, pp. 4247-4261, July 2020, doi: 10.1109/TCOMM.2020.2987311.
  48. J. Zheng, J. Zhang, E. Björnson and B. Ai, "Cell-Free Massive MIMO with Channel Aging and Pilot Contamination," August 25, 2020, doi.org/10.48550/arXiv.2008.10827.
  49. Q. Xu and P. Ren, "Secure Massive MIMO Downlink With Low-Resolution ADCs/DACs in the Presence of Active Eavesdropping," in IEEE Access, vol. 8, pp. 140981-140997, Aug 2020, doi: 10.1109/ACCESS.2020.3013635.
  50. J. Qiu, K. Xu and X. Xia, "Secure Transmission Based on Non-Overlapping AOA in Cell-Free Massive MIMO Networks," 2020 IEEE/CIC InternationalConference on Communications in China (ICCC), Aug 2020, pp.588-593, doi: 10.1109/ICCC49849.2020.9238973.
  51. M. Bashar et al., "Exploiting Deep Learning in Limited-Fronthaul Cell-Free Massive MIMO Uplink," in IEEE Journal on Selected Areas in Communications, vol. 38, no. 8, pp.1678-1697, Aug. 2020, doi: 10.1109/JSAC.2020.3000812.
  52. Yao Zhang, Meng Zhou, Haotong Cao, Longziang Yang, Hongbo Zhu, “Sum-rate maximization in uplink cell-free massive multiinput multioutpot system with jamming”, in Emerging Telecommunications Technologies, vol 31, issue 9, September 2020, https://doi.org/10.1002/ett.4044.
  53. A. K. Papazafeiropoulos, E. Björnson, P. Kourtessis, S. Chatzinotas and J. M. Senior, "Scalable Cell-Free Massive MIMO Systems With Hardware Impairments," 2020 IEEE31st Annual International Symposium on Personal, Indoor and Mobile Radio Communications, Sep 2020, pp. 1-7, doi: 10.1109/PIMRC48278.2020.9217151.
  54. T. Van Chien, E. Björnson and E. G. Larsson, "Joint Power Allocation and LoadBalancing Optimization for Energy-Efficient Cell-Free Massive MIMO Networks," in IEEE Transactions on Wireless Communications, vol. 19, no. 10, pp. 6798-6812, Oct. 2020, doi: 10.1109/TWC.2020.3006083.
  55. T. K. Nguyen, H. H. Nguyen and H. D.Tuan, "Max-Min QoS Power Control in Generalized Cell-Free Massive MIMO-NOMA With Optimal Backhaul Combining," in IEEE Transactions on Vehicular Technology, vol. 69, no. 10, pp. 10949-10964, Oct. 2020, doi:10.1109/TVT.2020.3006054.
  56. P. Pan, J. Zhang and L. -L. Yang, "Massive Distributed Antenna Systems: Channel Estimation and Signal Detection," in IEEE Access, vol. 8, pp. 186055-186070, Oct 2020, doi: 10.1109/ACCESS.2020.3030215.
  57. X. Wang, Y. Gao, G. Zhang and M. Guo, "Security Performance Analysis of Cell-Free Massive MIMO over Spatially Correlated Rayleigh Fading Channels with Active Spoofing Attack," 2020 International Conference on Wireless Communications and Signal Processing (WCSP), Oct 2020, pp. 540-545, doi: 10.1109/WCSP49889.2020.9299675.
  58. G. Interdonato, "Cell-Free Massive MIMO : Scalability, Signal Processing and Power Control," PhD dissertation, Linköping University Electronic Press, Linköping, Oct 2020, https://doi.org/10.3384/diss.diva-167218.
  59. S. Kusaladharma, W. -P. Zhu, W. Ajib and G. A. A. Baduge, "Stochastic Geometry Based Performance Characterization of SWIPT in Cell-Free Massive MIMO," in IEEE Transactions on Vehicular Technology, vol. 69, no. 11, pp. 13357-13370, Nov. 2020, doi: 10.1109/TVT.2020.3025746.
  60. M.Guenach, A. Gorji and A. Bourdoux, “Iterative Power Allocation and Access PointScheduling in Uplink Cell-Free Massive MIMO Systems,” GLOBECOM 2020 - 2020 IEEE Global CommunicationsConference, 2020, pp. 1-6, Dec 7, 2020, doi:10.1109/GLOBECOM42002.2020.9322341.
  61. Zakir Hussain Shaik, Emil Björnson, Erik G. Larsson, “MMSE-Optimal Sequential Processing for Cell-Free Massive MIMO With Radio Stripes”, Dec 27, 2020, https://arxiv.org/abs/2012.13928
  62. S. Elhoushy and W. Hamouda, "Nearest APs-Based Downlink Pilot Transmission for High Secrecy Rates in Cell-Free Massive MIMO," GLOBECOM 2020 - 2020 IEEE Global Communications Conference, Dec 2020, pp. 1-6, doi: 10.1109/GLOBECOM42002.2020.9348194.
  63. T. K. Nguyen, H. H. Nguyen and H. D. Tuan, "Adaptive Successive Interference Cancellation in Cell-free Massive MIMO-NOMA," 2020 IEEE 92nd Vehicular Technology Conference (VTC2020-Fall), Dec 2020, pp. 1-5, doi: 10.1109/VTC2020-Fall49728.2020.9348505.
  64. M. M. Mojahedian, R. Mosayebi and A.Lozano, "Pseudo-Inverse vs Generalized Inverse for C-RAN Downlink Precoding," GLOBECOM2020 - 2020 IEEE Global Communications Conference, Dec 2020, pp. 1-6, doi: 10.1109/GLOBECOM42002.2020.9348123.
  65. S. S. Hosseini, B. Champagne and X. -W. Chang, "A Green Downlink Power Allocation Scheme for Cell-Free Massive MIMO Systems," in IEEE Access, vol. 9, pp. 6498-6512, Jan 2021, doi: 10.1109/ACCESS.2020.3047720.
  66. M. Bashar et al., "Uplink Spectral and Energy Efficiency of Cell-Free Massive MIMO With Optimal Uniform Quantization," in IEEE Transactions on Communications, vol. 69, no. 1, pp. 223-245, Jan. 2021, doi: 10.1109/TCOMM.2020.3028305.
  67. M.Farooq, M. Juntti and L. -N. Tran, "Power Control for Multigroup Multicast Cell-Free Massive MIMO Downlink: Invited Paper," 2021 29th European Signal Processing Conference (EUSIPCO), January 23, 2021, pp. 930-934, doi: 10.23919/EUSIPCO54536.2021.9615937.
  68. R. Wang, M. Shen, Y. He and X. Liu, “Performance of Cell-Free Massive MIMO With Joint User Clustering and Access Point Selection,” in IEEE Access, vol. 9, pp. 40860-40870, Feb 1, 2021, doi: 10.1109/ACCESS.2021.3056051.
  69. Palhares, V.M., de Lamare, R.C., Flores, A.R. and Landau, L.T. (2020), "Iterative AP Selection, MMSE Pre-coding and Power Allocation in Cell-free Massive MIMO Systems," IET Communications, 14:3996-4006. Feb 2021, https://doi.org/10.1049/iet-com.2020.0627.
  70. T. M. Hoang, T. Q. Duong, H. D. Tuan, S. Lambotharan and L. Hanzo, "Physical Layer Security: Detection of Active Eavesdropping Attacks by Support Vector Machines," in IEEE Access, vol. 9, pp. 31595-31607, Feb 2021, doi: 10.1109/ACCESS.2021.3059648.
  71. Pouya Agheli, Mohammad Javad Emadi, Hamzeh Beyranvand, “Designing Cost- and Energy-Efficient Cell-Free Massive MIMO Network with Fiber and FSO Fronthaul Links”, Mar 9, 2021,  doi.org/10.48550/arXiv.2011.08511
  72. Zheng, j., Zhang, J., Bo, A., "UAV Communications with WPT-aided Cell-Free Massive MIMO Systems," in IEEE Journal on Selected Areas of Communications, vol. 20,no. 3, pp. 1756-1769, March 2021, doi: 10.1109/TWC.2020.3036281.
  73. Imoize, Agbotiname Lucky, Oluwadara Adedeji, Nistha Tandiya, and Sachin Shetty. 2021. "6G Enabled Smart Infrastructure for Sustainable Society: Opportunities, Challenges, and Research Roadmap" Sensors 21, no. 5: 1709. March 2021, https://doi.org/10.3390/s21051709.
  74. Ö. T. Demir and E. Björnson, "Joint Power Control and LSFD for Wireless-Powered Cell-Free Massive MIMO," in IEEE Transactions on Wireless Communications, April 23, 2021, doi.org/10.48550/arXiv.2104.11513.
  75. Xia, X., Zhu, P., Li, J. et al. "Joint Optimization of Spectral Efficiency for Cell-free Massive MIMO with Network-assisted Full Duplexing," Sci. China Inf. Sci. 64, 182311 (2021), Apr 2021, https://doi.org/10.1007/s11432-020-3139-9.
  76. Özlem Tugfe Demir, Emil Björnson and Luca Sanguinetti (2021), "Foundations of User-Centric Cell-Free Massive MIMO," Foundations and Trends in Signal Processing: Vol. 14: No.3-4, pp 162-472. Apr 2021, http://dx.doi.org/10.1561/2000000109.
  77. Z. Wang, J. Zhang, E. Björnson and B. Ai, "Uplink Performance of Cell-Free Massive MIMO Over Spatially Correlated Rician Fading Channels," in IEEE Communications Letters, vol. 25, no. 4, pp. 1348-1352, April 2021, doi: 10.1109/LCOMM.2020.3041899.
  78. M. Guenach, A. A. Gorji and A. Bourdoux, “Joint Power Control and Access Point Scheduling in Fronthaul-Constrained Uplink Cell-Free Massive MIMO Systems,” in IEEE Transactions on Communications, vol. 69, no. 4, pp. 2709-2722, April 2021, doi: 10.1109/TCOMM.2020.3047801.
  79. Geraci, Giovanni, et al., "What Will the Future of UAV Cellular Communications Be? A Flight from 5G to 6G", May 1, 2021, https://doi.org/10.48550/arXiv.2105.04842.
  80. Priyabrata Parida and Harpreet S. Dhillon, “Pilot Assignment Schemes for Cell-Free Massive MIMO Systems”, May 20,2021, doi.org/10.48550/arXiv.2105.09505.
  81. Khanh, Le Ty, et al., "Deep Learning for Uplink Spectral Efficiency in Cell-Free Massive MIMO System", Journal of Advances in Information Technology Vol. 12, No. 2, May 2021, DOI: 10.12720/jait.
  82. G. Interdonato, H. Q. Ngo and E. G. Larsson, "Enhanced Normalized Conjugate Beamforming for Cell-Free Massive MIMO," in IEEE Transactions on Communications, vol. 69, no. 5, pp. 2863-2877, May 2021, doi: 10.1109/TCOMM.2021.3055522.
  83. Gao, J., Wu, Y., Wang, Y. et al. “Uplink transmission design for crowded correlated cell-free massive MIMO-OFDM systems.” Sci. China Inf. Sci. 64, 182309 (June 2, 2021). https://doi.org/10.1007/s11432-020-3103-3
  84. Datta, Soumyadeep (2021): “Full-Duplex Cell-Free mMIMO Systems: Analysis and Decentralized Optimization," June 21, 2021, TechRxiv, Preprint, doi.org/10.36227/techrxiv.14805216.v1.
  85. 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," in IEEE Transactions onCommunications, vol. 69, no. 6, pp. 3741-3756, June 2021, doi:10.1109/TCOMM.2021.3059300.
  86. M. Y. Abdelsadek, H. Yanikomeroglu andG. K. Kurt, "Future Ultra-Dense LEO Satellite Networks: A Cell-Free Massive MIMO Approach," 2021 IEEE International Conference onCommunications Workshops (ICC Workshops), June 2021, pp. 1-6, doi:10.1109/ICCWorkshops50388.2021.9473753.
  87. Alvi Ataur Khalil, Mohamed Y. Selim, Mohammad Ashiqur Rahman, “CURE: Enabling RF Energy Harvesting using Cell-Free Massive MIMO UAVs Assisted by RIS”, Jul 22, 2021, doi.org/10.48550/arXiv.2107.10412
  88. R. Sabbagh, H. Zhu and J. Wang, "Cell-free Massive MIMO Systems under Jamming Attack," 2021 IEEE International Conference on Communications Workshops (ICC Workshops), Jul 2021, pp. 1-6, doi: 10.1109/ICCWorkshops50388.2021.9473710.
  89. I. M. Garba, S. Thomas and O. D. Oyeleke, "A Review of Network Massive MIMO and Cell Free Massive MIMO for 5G and B5G," 2021 1st International Conference on Multidisciplinary Engineering and Applied Science (ICMEAS), Jul 2021, pp. 1-6, doi: 10.1109/ICMEAS52683.2021.9692387.
  90. M. Guenach, A. Gorji and A. Bourdoux, “Power Control and Node Scheduling in Uplink Cell-free Massive MIMO with Centralized Beamforming,” ICC 2021 - IEEE International Conference on Communications, 2021, pp. 1-6, Aug 6, 2021, doi: 10.1109/ICC42927.2021.9500843.
  91. M. Guenach, A. Gorji and A. Bourdoux, “A Deep Neural Architecture for Real-time Node Scheduling in Uplink Cell-Free Massive MIMO,” 2021 29th European Signal Processing Conference (EUSIPCO), 2021, pp. 1626-1630, Aug 23, 2021, doi: 10.23919/EUSIPCO54536.2021.9615979.
  92. W. Jiang and H. D. Schotten, “Cell-Free Massive MIMO-OFDM Transmission Over Frequency-Selective Fading Channels,” in IEEE Communications Letters, vol. 25, no. 8, pp. 2718-2722, Aug. 2021, doi: 10.1109/LCOMM.2021.3085965.
  93. L. Mucchi et al., "Physical-Layer Security in 6G Networks," in IEEE Open Journal of the Communications Society, vol. 2, pp. 1901-1914, Aug 2021, doi: 10.1109/OJCOMS.2021.3103735.
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