References & Further Reading

References

1. M. Mohammadi, H. Q. Ngo, M. Matthaiou, G. Caire, Cell-Free Massive MIMO with OTFS Modulation, 2023

   Foundational CommIT contribution on cell-free OTFS. Core reference for Chapter 17; establishes the 35% throughput gain.

2. H. Q. Ngo, A. Ashikhmin, H. Yang, E. G. Larsson, T. L. Marzetta, Cell-Free Massive MIMO Versus Small Cells, 2017

   Original cell-free massive MIMO paper. Foundation for conjugate beamforming theory.

3. E. Björnson, L. Sanguinetti, H. Wymeersch, J. Hoydis, T. L. Marzetta, Massive MIMO is a Reality — What is Next?, 2019

   Broad survey of massive MIMO and cell-free architectures. Reference for deployment and scaling.

4. P. Raviteja, K. T. Phan, Y. Hong, Embedded Pilot-Aided Channel Estimation for OTFS in Delay-Doppler Channels, 2019

   Embedded-pilot channel estimation for OTFS. Core reference for §2.

5. R. Hadani, S. Rakib, M. Tsatsanis, A. Monk, A. J. Goldsmith, A. F. Molisch, R. Calderbank, Orthogonal Time Frequency Space Modulation, 2017

   Original OTFS modulation framework.

6. P. Raviteja, K. T. Phan, Y. Hong, E. Viterbo, Interference Cancellation and Iterative Detection for Orthogonal Time Frequency Space Modulation, 2018

   OTFS detection framework. Referenced for multi-user detection in cell-free OTFS.

7. D. N. C. Tse, P. Viswanath, Fundamentals of Wireless Communication, Cambridge University Press, 2005

   MIMO and massive MIMO fundamentals. Reference throughout.

8. T. L. Marzetta, Noncooperative Cellular Wireless with Unlimited Numbers of Base Station Antennas, 2010

   Seminal massive MIMO paper. Channel hardening arguments reused in cell-free.

9. A. Ashikhmin, L. Li, T. L. Marzetta, Interference Reduction in Multi-Cell Massive MIMO Systems with Large-Scale Fading Precoding, 2018

   Pilot contamination mitigation. Reference for §2 analysis.

10. O-RAN Alliance, O-RAN Architecture Description 6.0, 2023

    O-RAN architecture specification. Reference for §5 fronthaul and deployment.

11. E. Nayebi, A. Ashikhmin, T. L. Marzetta, B. D. Rao, Performance of Cell-Free Massive MIMO Systems with MMSE and LSFD Receivers, 2016

    MMSE and LSFD receivers for cell-free. Relevant to §3 beyond conjugate BF.

12. O. T. Demir, E. Björnson, L. Sanguinetti, Foundations of User-Centric Cell-Free Massive MIMO, 2021

    Comprehensive treatment of user-centric cell-free. Reference for §1 clustering.

13. M. K. Ramachandran, A. Chockalingam, MIMO-OTFS in High-Doppler Fading Channels: Signal Detection and Channel Estimation, 2018

    MIMO-OTFS foundational paper. Channel model foundation for cell-free OTFS.

Further Reading

• Cell-free massive MIMO fundamentals

  Ngo, Ashikhmin, Yang, Larsson, Marzetta (IEEE TWC 2017); Björnson et al. (DSP 2019); Demir, Björnson, Sanguinetti (FnT Signal Proc. 2021)

  The definitive references for cell-free massive MIMO. Essential for understanding the architecture beyond the OTFS extension.

• Pilot contamination and reuse

  Ashikhmin, Li, Marzetta (IEEE TIT 2018); Fernandes, Ashikhmin, Marzetta (IEEE TCOM 2013)

  Pilot contamination analysis and mitigation — core to scalable cell-free.

• User-centric clustering

  Demir, Björnson, Sanguinetti (FnT 2021); Nayebi et al. (IEEE Asilomar 2016)

  Scalable clustering algorithms — essential for large deployments.

• O-RAN and fronthaul

  O-RAN Alliance documents; 3GPP TS 38.201 (Physical Layer), 38.301 (Protocol)

  Open RAN architecture specifications that enable cell-free OTFS deployment.

• Energy efficiency in cell-free

  Özdogan, Björnson, Larsson (IEEE TVT 2020); Björnson et al.

  Energy-efficiency analysis of cell-free — important for commercial deployment.

• AI/ML for cell-free

  Xiang, Björnson (IEEE JSAC 2022); Bao, Björnson (IEEE TWC 2023)

  Machine learning applied to cell-free resource allocation, clustering, and user association.