References & Further Reading

References

  1. G. Caire, I. Atzeni, and A. Pezeshki, Multiuser Multibeam Array-Fed RIS for High-Frequency Bands, 2023

    The flagship CommIT Group paper on array-fed RIS. All sections of this chapter build directly on this reference. Definitive read.

  2. V. Jamali, A. Alizadeh, M. Vlachos, E. Basar, and R. Schober, Intelligent Reflecting and Transmitting Surface Aided Multi-User Full-Duplex Wireless Networks, 2022

    Complementary array-fed architecture focused on full-duplex RIS operation. Section III on geometry informs Section 11.1.

  3. M. Cui and L. Dai, Channel Estimation for Extremely Large-Scale MIMO: Far-Field or Near-Field?, 2022

    Near-field vs. far-field channel modeling for large arrays. Theorem 2 in Section 11.2 is built on the near-field DoF analysis here.

  4. Z. Wang, J. Zhang, H. Du, D. Niyato, S. Cui, B. Ai, M. Debbah, K. B. Letaief, and H. V. Poor, A Tutorial on Extremely Large-Scale MIMO for 6G: Fundamentals, Signal Processing, and Applications, 2024

    Tutorial on XL-MIMO and near-field signal processing. Excellent context for array-fed RIS.

  5. Q. Wu and R. Zhang, Intelligent Reflecting Surface Enhanced Wireless Network via Joint Active and Passive Beamforming, 2019

    Foundational passive RIS. Array-fed RIS inherits the joint optimization framework but specializes it to the near-field eigenmode setting.

  6. M. Di Renzo et al., Smart Radio Environments Empowered by Reconfigurable Intelligent Surfaces, 2020

    Survey; Section IV discusses near-field operation which is the theoretical basis of array-fed RIS.

  7. C. Pan et al., Multicell MIMO Communications Relying on Intelligent Reflecting Surfaces, 2020

    Multi-user RIS framework extended by the eigenmode analysis of Section 11.2.

  8. R. Zhang and L. Dai, Efficient Design of Phase Shifts for Reconfigurable Intelligent Surface-Aided Channel Estimation, 2023

    Channel estimation variants relevant to the two-timescale approach in Section 11.4.

  9. C. A. Balanis, Antenna Theory: Analysis and Design, Wiley, 4th ed., 2016

    Chapter 2 covers near-field/far-field boundaries essential to the DoF analysis of array-fed RIS.

  10. E. Björnson, Ö. Özdogan, and E. G. Larsson, Reconfigurable Intelligent Surfaces vs. Amplify-and-Forward Relaying: A Fair Comparison and the Achievable Rate Gain, 2022

    Modern update of Björnson et al. (2020) with array-fed RIS considerations. Relevant for the cost/benefit analysis in Section 11.1.

  11. C. You and R. Zhang, Near-Field Beam Management for Extremely Large-Scale Array Communications, 2023

    Near-field beam management for large arrays. Informs the user-eigenmode mapping discussion in Section 11.3.

  12. R. W. Heath Jr., N. González-Prelcic, S. Rangan, W. Roh, and A. M. Sayeed, An Overview of Signal Processing Techniques for Millimeter Wave MIMO Systems, 2016

    Foundational hybrid analog-digital beamforming review. Array-fed RIS is a natural extension — active array with digital baseband + passive RIS as distributed analog phase shifter.

Further Reading

Resources for deeper study of array-fed RIS.

  • Near-field MIMO and 6G

    Wang et al. (2024), 'A Tutorial on Extremely Large-Scale MIMO for 6G' (ch11 ref)

    Most recent synthesis of XL-MIMO + near-field theory. Array-fed RIS sits at the intersection.

  • Sub-THz RIS hardware

    Sengupta, Nagatsuma, and Mittleman (2018), 'Terahertz integrated electronic and hybrid electronic-photonic systems,' Nature Electronics

    Hardware realization of RIS at sub-THz. Crucial for deploying array-fed RIS in 140-300 GHz bands.

  • CommIT full paper series

    Caire et al. (2023), 'Multiuser Multibeam Array-Fed RIS...' + companion papers on CSI and scheduling (Caire 2022, 2023)

    The complete CommIT framework requires reading all three papers. Start with the flagship (ch11 ref), then Caire 2022 on scheduling (Chapter 7 ref), then the 2023 active-RIS paper (Chapter 9 ref).

  • ETSI RIS standardization

    ETSI GR RIS 001-003 (2023-2024)

    Industrial standardization of RIS features including array-fed architectures. Reflects the commercial trajectory.

  • Near-field beam codebooks

    You, Zhang (2023), 'Near-Field Beam Management' (ch11 ref)

    Practical beam codebook design for near-field large arrays — directly applicable to the eigenbeam design in Section 11.3.

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