All Stories

  1. Sensing-Assisted Communication for mmWave Networks: A Review of Techniques, Applications, and Future Directions

    Article • Electronics, September 2025, MDPI AG

    Dr Daniel Castanheira

  2. An Over-the-Air Multi-User Convolutional Code for URLLC

    Article • IEEE Open Journal of the Communications Society, January 2025, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  3. Sequential Hybrid Beamforming for Radio Stripes

    Article • IEEE Access, January 2025, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  4. Nonlinear Distortion-Aware Interference Alignment for Ultra-Dense Networks

    Article • IEEE Transactions on Communications, November 2024, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  5. Hybrid Beamforming Design for Communication-Centric ISAC

    Article • IEEE Sensors Journal, July 2024, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  6. Pipelined Multi-User IR-HARQ Scheme for Improved Latency Performance in URLLC

    Article • IEEE Access, January 2024, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  7. Joint Decoding and UE-APs Association for Scalable Cell-Free Systems

    Article • IEEE Transactions on Communications, December 2023, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  8. A Review on Cell-Free Massive MIMO Systems

    Article • Electronics, February 2023, MDPI AG

    Dr Daniel Castanheira

  9. Multi-User IR-HARQ Latency and Resource Optimization for URLLC

    Article • IEEE Access, January 2023, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  10. Hybrid Multiuser Equalizer With Nonlinearity Compensation for Wideband mmWave Massive MIMO Uplink Systems

    Article • IEEE Transactions on Wireless Communications, December 2022, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  11. Distributed Hybrid Equalization for Cooperative Millimeter-Wave Cell-Free Massive MIMO

    Article • IEEE Transactions on Communications, August 2022, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  12. Centralized Hybrid Equalization for Cell Free mMIMO mmWave based Systems

    Article • July 2022, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  13. Hybrid Multi-User Equalization and Analog Precoder for Uplink mm Wave Cell Free Systems

    Article • June 2022, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  14. Two-stage estimation algorithm based on interleaved OFDM for a cooperative bistatic ISAC scenario

    Article • June 2022, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  15. On SFBC Schemes for Enabling Virtual Array Concept in Monostatic ISAC Scenarios

    Article • Sensors, February 2022, MDPI AG

    Dr Daniel Castanheira

  16. A Method Exploiting the Channel-Training Phase to Achieve Secrecy in a Fading Broadcast Channel

    Article • IEEE Transactions on Signal and Information Processing over Networks, January 2022, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  17. Cooperative Multiterminal Radar and Communication: A New Paradigm for 6G Mobile Networks

    Article • IEEE Vehicular Technology Magazine, December 2021, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  18. 5G-NR based Joint RADAR and Communication System Using Low-Cost Photonic Fronthaul

    Article • November 2021, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  19. Cooperative Method for Distributed Target Tracking for OFDM Radar With Fusion of Radar and Communication Information

    Article • IEEE Sensors Journal, July 2021, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  20. A State-space Approach for Efficient Channel Tracking in Hybrid Analog/Digital MIMO Architectures

    Article • April 2021, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  21. A State-Space Approach for Tracking Doppler Shifts in Radio Inter-Satellite Links

    Article • IEEE Access, January 2021, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  22. A Survey of Candidate Waveforms for beyond 5G Systems

    Article • Electronics, December 2020, MDPI AG

    Dr Daniel Castanheira

  23. High-Resolution Delay-Doppler Estimation Using Received Communication Signals for OFDM Radar-Communication System

    Article • IEEE Transactions on Vehicular Technology, November 2020, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  24. Fusion of Radar and Communication Information for Tracking in OFDM Automotive Radar at 24 GHz

    Article • August 2020, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  25. Two-Step Multiuser Equalization for Hybrid mmWave Massive MIMO GFDM Systems

    Article • Electronics, July 2020, MDPI AG

    Dr Daniel Castanheira

  26. Alamouti coding scheme and virtual array concept for joint radar and communication systems

    Article • July 2020, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  27. Hybrid Multiuser Equalizer for mmWave Massive MIMO GFDM Systems

    Article • July 2020, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  28. A State-space Approach for MIMO Channel Tracking in SC-FDE Transmissions

    Article • May 2020, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  29. A Cooperative Jamming Technique to Protect a Two-User Broadcast Channel with Confidential Messages and an External Eavesdropper

    Article • Electronics, March 2020, MDPI AG

    Dr Daniel Castanheira

  30. Iterative Analog–Digital Multi-User Equalizer for Wideband Millimeter Wave Massive MIMO Systems

    Article • Sensors, January 2020, MDPI AG

    Dr Daniel Castanheira

  31. Efficient Joint Channel Equalization and Tracking for V2X Communications Using SC-FDE Schemes

    Article • IEEE Access, January 2020, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  32. Low Complexity and High-Resolution Line Spectral Estimation Using Cyclic Minimization

    Article • IEEE Transactions on Signal Processing, December 2019, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  33. Joint Channel Equalization and Tracking for V2X Communications Using SC-FDE Schemes

    Article • December 2019, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  34. High-Resolution DOA Estimation of Closely-Spaced and Correlated Targets for MIMO OFDM Radar-Communication System

    Article • October 2019, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  35. A multi-user linear equalizer for uplink broadband millimeter wave massive MIMO

    Article • Digital Signal Processing, September 2019, Elsevier

    Dr Daniel Castanheira

  36. Hybrid Nonlinear Multiuser Equalizer for mmWave Massive MIMO CE-OFDM Systems

    Article • September 2019, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  37. Joint Channel Equalization and Tracking for SC-FDE Schemes

    Article • September 2019, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  38. Securing Non-Orthogonal Multiple Access Systems Against Simultaneous Eavesdropping Attacks Coming from Inside and Outside of the Network

    Article • September 2019, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  39. Multiuser Equalizer for Hybrid Massive MIMO mmWave CE-OFDM Systems

    Article • Applied Sciences, August 2019, MDPI AG

    Dr Daniel Castanheira

  40. Development and evaluation of an OFDM Radar in a FPGA

    Article • August 2019, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  41. Multi-User Linear Equalizer and Precoder Scheme for Hybrid Sub-Connected Wideband Systems

    Article • Electronics, April 2019, MDPI AG

    Dr Daniel Castanheira

  42. Hybrid Multi-User Equalizer for Massive MIMO Millimeter-Wave Dynamic Subconnected Architecture

    Article • IEEE Access, January 2019, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  43. Non-Orthogonal Multicarrier Waveform for Radar With Communications Systems: 24 GHz GFDM RadCom

    Article • IEEE Access, January 2019, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  44. Two-Step Analog-Digital Multiuser Equalizer for Hybrid Precoded mmWave Communications

    Article • December 2018, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  45. 24 GHz QAM-FBMC Radar with Communication System (RadCom)

    Article • November 2018, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  46. Comparison of DoA Algorithms for MIMO OFDM Radar

    Article • September 2018, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  47. Two-Step Hybrid Multiuser Equalizer for Sub-Connected mmWave Massive MIMO SC-FDMA Systems

    Article • September 2018, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  48. Secrecy Analysis of EGT and MRT Precoders for M -QAM Constellations

    Article • August 2018, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  49. Two-tier cellular system up-link based on space-frequency block codes and signal alignment

    Article • April 2018, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  50. Research Challenges, Trends and Applications for Future Joint Radar Communications Systems

    Article • Wireless Personal Communications, March 2018, Springer Science + Business Media

    Dr Daniel Castanheira

  51. Joint Space-Frequency Block Codes and Signal Alignment for Heterogeneous Networks

    Article • IEEE Access, January 2018, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  52. Exploiting the Reciprocal Channel for Discrete Jamming to Secure Wireless Communications Against Multiple-Antenna Eavesdropper

    Article • IEEE Access, January 2018, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  53. Intrinsic Secrecy of EGT and MRT Precoders for Proper and Improper Modulations

    Article • IEEE Access, January 2018, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  54. Performance evaluation of a frequency selective millimeter wave system with limited feedback

    Article • November 2017, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  55. A Novel SA-PNC Method for Macro and Small Cells Coexistence under the Same Spectrum

    Article • September 2017, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  56. A new SA-PNC scheme for uplink HetNets

    Article • August 2017, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  57. Joint signal alignment precoding and physical network coding for heterogeneous networks

    Article • Physical Communication, June 2017, Elsevier

    Dr Daniel Castanheira

  58. Nonlinear Equalizer for Multi-User Hybrid mmW Massive MIMO Systems

    Article • June 2017, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  59. Parametrization and Applications of Precoding Reuse and Downlink Interference Alignment

    Article • IEEE Transactions on Wireless Communications, April 2017, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  60. Retrospective Interference Alignment: Degrees of Freedom Scaling With Distributed Transmitters

    Article • IEEE Transactions on Information Theory, March 2017, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  61. Exploiting reciprocal channel estimations for jamming to secure wireless communications

    Article • March 2017, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  62. Hybrid Iterative Space-Time Equalization for Multi-User mmW Massive MIMO Systems

    Article • IEEE Transactions on Communications, February 2017, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  63. Hybrid Beamforming Designs for Massive MIMO Millimeter-Wave Heterogeneous Systems

    Article • IEEE Access, January 2017, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  64. Iterative Multiuser Equalization for Subconnected Hybrid mmWave Massive MIMO Architecture

    Article • Wireless Communications and Mobile Computing, January 2017, Hindawi Publishing Corporation

    Dr Daniel Castanheira, Adão Silva

  65. Joint Design of Massive MIMO Precoder and Security Scheme for Multiuser Scenarios under Reciprocal Channel Conditions

    Article • Wireless Communications and Mobile Computing, January 2017, Hindawi Publishing Corporation

    Dr Daniel Castanheira, Dr Marco A. C. Gomes, Adão Silva

  66. Physical-Layer Transmission Cooperative Strategies for Heterogeneous Networks

    Article • December 2016, IntechOpen

    Dr Daniel Castanheira

  67. Retrospective Interference Alignment for the $K$ -User $M\times N$ MIMO Interference Channel

    Article • IEEE Transactions on Wireless Communications, December 2016, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  68. Non linear space-time equalizer for single-user hybrid mmWave massive MIMO systems

    Article • October 2016, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  69. Two-stage space-time receiver structure for multiuser hybrid mmW massive MIMO systems

    Article • October 2016, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  70. Iterative space-frequency equalizer for CE-OFDM mmW based systems

    Article • June 2016, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  71. Joint signal alignment and physical network coding for heterogeneous networks

    Article • May 2016, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  72. Joint IA and SFBC Macrocells and Small-Cells Coexistence under Minor Information Exchange

    Article • Mobile Information Systems, January 2016, Hindawi Publishing Corporation

    Dr Daniel Castanheira

  73. Multi-user HetNets with imperfect CSI: Iterative equalization aided IA

    Article • October 2015, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  74. Limited Intersystem Information Exchange Method for Heterogeneous Networks

    Article • IEEE Communications Letters, September 2015, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  75. Efficient Transmitter and Receiver Designs for SC-FDMA Based Heterogeneous Networks

    Article • IEEE Transactions on Communications, July 2015, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  76. Transmission Cooperative Strategies for MIMO-OFDM Heterogeneous Networks

    Article • Radioengineering, June 2015, Brno University of Technology

    Dr Daniel Castanheira

  77. Iterative Equalization and Interference Alignment for Multiuser MIMO HetNets with Imperfect CSI

    Article • Mobile Information Systems, January 2015, Hindawi Publishing Corporation

    Dr Daniel Castanheira

  78. Set Optimization for Efficient Interference Alignment in Heterogeneous Networks

    Article • IEEE Transactions on Wireless Communications, October 2014, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  79. Minimum Codebook Size to Achieve Maximal Diversity Order for RVQ-Based MIMO Systems

    Article • IEEE Communications Letters, August 2014, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  80. Robust leakage-based distributed precoder for cooperative multicell systems

    Article • The Journal of Engineering, July 2014, the Institution of Engineering and Technology (the IET)

    Dr Daniel Castanheira

  81. Downlink cognitive interference alignment for heterogeneous networks

    Article • May 2014, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  82. Null-space cognitive precoding for heterogeneous networks

    Article • IET Communications, March 2014, the Institution of Engineering and Technology (the IET)

    Dr Daniel Castanheira

  83. New robust iterative minimum mean squared error-based interference alignment algorithm

    Article • The Journal of Engineering, February 2014, the Institution of Engineering and Technology (the IET)

    Dr Sara Helena Teodoro, Dr Daniel Castanheira

  84. One-bit null-space cognitive interference alignment for heterogeneous networks

    Article • September 2013, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  85. Novel Windowing Scheme for Cognitive OFDM Systems

    Article • IEEE Wireless Communications Letters, June 2013, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  86. Coordinated Precoding Techniques for Multi-cell MISO-OFDM Networks

    Article • Wireless Personal Communications, March 2013, Springer Science + Business Media

    Dr Daniel Castanheira

  87. A novel distributed power allocation scheme for coordinated multicell systems

    Article • EURASIP Journal on Wireless Communications and Networking, February 2013, Springer Science + Business Media

    Dr Daniel Castanheira

  88. Linear and Nonlinear Precoding Schemes for Centralized Multicell MIMO-OFDM Systems

    Article • Wireless Personal Communications, February 2013, Springer Science + Business Media

    Dr Daniel Castanheira

  89. System Concepts for the Central Processing of Signals

    Article • August 2012, Wiley

    Dr Daniel Castanheira

  90. Minimum bit error rate nonlinear precoding for multiuser MIMO and high SNR

    Article • Physical Communication, December 2011, Elsevier

    Dr Daniel Castanheira

  91. Minimum bit-error-rate nonlinear precoding for multi-user distributed antenna systems

    Article • December 2011, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  92. Lossy source coding using belief propagation and soft-decimation over LDGM codes

    Article • September 2010, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  93. Distributed antenna system capacity scaling [Coordinated and Distributed MIMO

    Article • IEEE Wireless Communications, June 2010, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira

  94. Single/Multi-User MIMO Differential Capacity

    Article • April 2010, IntechOpen

    Dr Daniel Castanheira

  95. Distributed MISO system capacity over Rayleigh flat fading channels’

    Article • September 2008, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Daniel Castanheira