1.
Majumder, Debparna; Bottrill, Kyle R. H.; Petropoulos, Periklis
Fibre-Based Dynamic Speckle Generation for Emulation of Atmospheric Turbulence Proceedings Article
In: 2025 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), pp. 1–1, 2025, ISSN: 2833-1052, (ISSN: 2833-1052).
Abstract | Links | BibTeX | Tags: Emulation, Europe, Free-space optical communication, Generators, Low earth orbit satellites, Optical fibers, Phase modulation, Satellites, Speckle, System performance
@inproceedings{majumder_fibre-based_2025,
title = {Fibre-Based Dynamic Speckle Generation for Emulation of Atmospheric Turbulence},
author = {Debparna Majumder and Kyle R. H. Bottrill and Periklis Petropoulos},
url = {https://ieeexplore.ieee.org/abstract/document/11110258},
doi = {10.1109/CLEO/Europe-EQEC65582.2025.11110258},
issn = {2833-1052},
year = {2025},
date = {2025-06-01},
urldate = {2025-10-08},
booktitle = {2025 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)},
pages = {1–1},
abstract = {Mitigating the impact of atmospheric turbulence induced speckle is a major challenge for free-space optical communications (FSOC). Such turbulence results in a multimodal, speckled beam which can be challenging to couple into the small active-area photoreceivers needed for high-bandwidth detection. Naturally, lab-based turbulence emulators are needed to benchmark FSOC system performance and develop turbulence mitigating subsystems. Common approaches to turbulence emulation include: rotating phase plates (PPs) [1], spatial light modulators (SLMs) [2] and turbulent-air generators [3]. In this work, we present a fibre-based, dynamic speckle generator, notable for its simplicity, cost-effectiveness (especially compared to SLMs and PPs), and unobtrusive in-lab use (compared to turbulent-air approaches). Unlike today's SLMs, which currently struggle to replicate the fast-changing distortion caused by high slew-rate Low-Earth-Orbit (LEO) satellite tracking, our all-fibre speckle generator can be easily scaled to faster modulation speeds (demonstrated here with a modest 230RPM).},
note = {ISSN: 2833-1052},
keywords = {Emulation, Europe, Free-space optical communication, Generators, Low earth orbit satellites, Optical fibers, Phase modulation, Satellites, Speckle, System performance},
pubstate = {published},
tppubtype = {inproceedings}
}
Mitigating the impact of atmospheric turbulence induced speckle is a major challenge for free-space optical communications (FSOC). Such turbulence results in a multimodal, speckled beam which can be challenging to couple into the small active-area photoreceivers needed for high-bandwidth detection. Naturally, lab-based turbulence emulators are needed to benchmark FSOC system performance and develop turbulence mitigating subsystems. Common approaches to turbulence emulation include: rotating phase plates (PPs) [1], spatial light modulators (SLMs) [2] and turbulent-air generators [3]. In this work, we present a fibre-based, dynamic speckle generator, notable for its simplicity, cost-effectiveness (especially compared to SLMs and PPs), and unobtrusive in-lab use (compared to turbulent-air approaches). Unlike today's SLMs, which currently struggle to replicate the fast-changing distortion caused by high slew-rate Low-Earth-Orbit (LEO) satellite tracking, our all-fibre speckle generator can be easily scaled to faster modulation speeds (demonstrated here with a modest 230RPM).
2.
Soleymani, Mohammad; Santamaria, Ignacio; Jorswieck, Eduard; Renzo, Marco Di; Schober, Robert; Hanzo, Lajos
Rate Splitting Multiple Access for RIS-aided URLLC MIMO Broadcast Channels Journal Article
In: IEEE Transactions on Wireless Communications, pp. 1–1, 2025, ISSN: 1558-2248.
Abstract | Links | BibTeX | Tags: 6G mobile communication, Channel coding, Europe, Finite block length coding, Interference, low latency, max-min energy efficiency, max-min rate, MIMO, MIMO systems, MISO, NOMA, reconfigurable intelligent surface, Reliability, Resource management, Ultra reliable low latency communication, ultra-reliable communications
@article{soleymani_rate_2025,
title = {Rate Splitting Multiple Access for RIS-aided URLLC MIMO Broadcast Channels},
author = {Mohammad Soleymani and Ignacio Santamaria and Eduard Jorswieck and Marco Di Renzo and Robert Schober and Lajos Hanzo},
url = {https://ieeexplore.ieee.org/document/11123651},
doi = {10.1109/TWC.2025.3591365},
issn = {1558-2248},
year = {2025},
date = {2025-01-01},
urldate = {2025-10-08},
journal = {IEEE Transactions on Wireless Communications},
pages = {1–1},
abstract = {The performance of modern wireless communication systems is typically limited by interference. The impact of interference can be even more severe in ultra-reliable and low-latency communication (URLLC) use cases. A powerful tool for managing interference is rate splitting multiple access (RSMA), which encompasses many multiple-access technologies like non-orthogonal multiple access (NOMA), spatial division multiple access (SDMA), and broadcasting. Another effective technology to enhance the performance of URLLC systems and mitigate interference is constituted by reconfigurable intelligent surfaces (RISs). This paper develops RSMA schemes for multi-user multiple-input multiple-output (MIMO) RIS-aided broad-cast channels (BCs) based on finite block length (FBL) coding. We show that RSMA and RISs can substantially improve the spectral efficiency (SE) and energy efficiency (EE) of MIMO RIS-aided URLLC systems. Additionally, the gain of employing RSMA and RISs noticeably increases when the reliability and latency constraints are more stringent. Furthermore, RISs impact RSMA differently, depending on the user load. If the system is underloaded, RISs are able to manage the interference sufficiently well, making the gains of RSMA small. However, when the user load is high, RISs and RSMA become synergetic.},
keywords = {6G mobile communication, Channel coding, Europe, Finite block length coding, Interference, low latency, max-min energy efficiency, max-min rate, MIMO, MIMO systems, MISO, NOMA, reconfigurable intelligent surface, Reliability, Resource management, Ultra reliable low latency communication, ultra-reliable communications},
pubstate = {published},
tppubtype = {article}
}
The performance of modern wireless communication systems is typically limited by interference. The impact of interference can be even more severe in ultra-reliable and low-latency communication (URLLC) use cases. A powerful tool for managing interference is rate splitting multiple access (RSMA), which encompasses many multiple-access technologies like non-orthogonal multiple access (NOMA), spatial division multiple access (SDMA), and broadcasting. Another effective technology to enhance the performance of URLLC systems and mitigate interference is constituted by reconfigurable intelligent surfaces (RISs). This paper develops RSMA schemes for multi-user multiple-input multiple-output (MIMO) RIS-aided broad-cast channels (BCs) based on finite block length (FBL) coding. We show that RSMA and RISs can substantially improve the spectral efficiency (SE) and energy efficiency (EE) of MIMO RIS-aided URLLC systems. Additionally, the gain of employing RSMA and RISs noticeably increases when the reliability and latency constraints are more stringent. Furthermore, RISs impact RSMA differently, depending on the user load. If the system is underloaded, RISs are able to manage the interference sufficiently well, making the gains of RSMA small. However, when the user load is high, RISs and RSMA become synergetic.
3.
Hanzo, Lajos; Babar, Zunaira; Cai, Zhenyu; Chandra, Daryus; Djordjevic, Ivan B.; Koczor, Balint; Ng, Soon Xin; Razavi, Mohsen; Simeone, Osvaldo
Quantum Information Processing, Sensing, and Communications: Their Myths, Realities, and Futures Journal Article
In: Proceedings of the IEEE, pp. 1–51, 2025, ISSN: 1558-2256.
Abstract | Links | BibTeX | Tags: Codes, Encoding, Error correction codes, Europe, Information processing, Next generation networking, Prevention and mitigation, Quantum communications, Quantum computing, quantum error correction coding, quantum error mitigation, quantum key distribution (QKD), Quantum Machine Learning, quantum sensing, quantum-secured direct communications (QSDC), Qubit, Wireless communication
@article{hanzo_quantum_2025,
title = {Quantum Information Processing, Sensing, and Communications: Their Myths, Realities, and Futures},
author = {Lajos Hanzo and Zunaira Babar and Zhenyu Cai and Daryus Chandra and Ivan B. Djordjevic and Balint Koczor and Soon Xin Ng and Mohsen Razavi and Osvaldo Simeone},
url = {https://ieeexplore.ieee.org/document/10828532},
doi = {10.1109/JPROC.2024.3510394},
issn = {1558-2256},
year = {2025},
date = {2025-01-01},
urldate = {2025-10-08},
journal = {Proceedings of the IEEE},
pages = {1–51},
abstract = {The recent advances in quantum information processing, sensing, and communications are surveyed with the objective of identifying the associated knowledge gaps and formulating a roadmap for their future evolution. Since the operation of quantum systems is prone to the deleterious effects of decoherence, which manifests itself in terms of bit-flips, phase-flips, or both, the pivotal subject of quantum error mitigation is reviewed both in the presence and absence of quantum coding. The state of the art, knowledge gaps, and future evolution of quantum machine learning (QML) are also discussed, followed by a discourse on quantum radar systems and briefly hypothesizing about the feasibility of integrated sensing and communications (ISAC) in the quantum domain (QD). Finally, we conclude with a set of promising future research ideas in the field of ultimately secure quantum communications with the objective of harnessing ideas from the classical communications field.},
keywords = {Codes, Encoding, Error correction codes, Europe, Information processing, Next generation networking, Prevention and mitigation, Quantum communications, Quantum computing, quantum error correction coding, quantum error mitigation, quantum key distribution (QKD), Quantum Machine Learning, quantum sensing, quantum-secured direct communications (QSDC), Qubit, Wireless communication},
pubstate = {published},
tppubtype = {article}
}
The recent advances in quantum information processing, sensing, and communications are surveyed with the objective of identifying the associated knowledge gaps and formulating a roadmap for their future evolution. Since the operation of quantum systems is prone to the deleterious effects of decoherence, which manifests itself in terms of bit-flips, phase-flips, or both, the pivotal subject of quantum error mitigation is reviewed both in the presence and absence of quantum coding. The state of the art, knowledge gaps, and future evolution of quantum machine learning (QML) are also discussed, followed by a discourse on quantum radar systems and briefly hypothesizing about the feasibility of integrated sensing and communications (ISAC) in the quantum domain (QD). Finally, we conclude with a set of promising future research ideas in the field of ultimately secure quantum communications with the objective of harnessing ideas from the classical communications field.