arXiv subjects

Miguel Dajer

Publications and source records attributed to Miguel Dajer.

5 recordsLinked to original sources

arXiv2026

ISAC-Enabled Non-Terrestrial Networks for 6G: Design Principles, Standardization, Performance Tradeoffs, and Use Cases

Non-Terrestrial Networks (NTN) have emerged as a key enabler to fully realize the vision of integrated, intelligent, and ubiquitous connectivity in 6G systems. However, several operational challenges, including severe Doppler effects, interference, and latency, hinder the seamless integration of NTN and Terrestrial Networks (TN). In this context, Integrated Sensing and Communication (ISAC), which unifies sensing and communication functionalities within a common framework, offers great potential to address these challenges while enabling new network capabilities. Due to its complementary functionalities, ISAC can play a pivotal role in enhancing NTN performance, although its practical adoption requires a fundamental rethinking of existing architectural and standardization frameworks. Motivated by this need, this article examines key aspects of ISAC-enabled NTN, including architectural design principles, application scenarios, standardization challenges, and key performance tradeoffs. Finally, a representative case study is presented to illustrate major technical challenges and highlight promising future research directions for ISAC-enabled NTN.

cs.IT↗

arXiv2024

Non-Terrestrial Networks for 6G: Integrated, Intelligent and Ubiquitous Connectivity

Universal connectivity has been part of past and current generations of wireless systems, but as we approach 6G, the subject of social responsibility is being built as a core component. Given the advent of Non-Terrestrial Networks (NTN), reaching these goals will be much closer to realization than ever before. Owing to the benefits of NTN, the integration NTN and Terrestrial Networks (TN) is still infancy, where the past, the current and the future releases in the 3$^{\text{rd}}$ Generation Partnership Project (3GPP) provide guidelines to adopt a successfully co-existence/integration of TN and NTN. Therefore, in this article, we have illustrated through 3GPP guidelines, on how NTN and TN can effectively be integrated. Moreover, the role of beamforming and Artificial Intelligence (AI) algorithms is highlighted to achieve this integration. Finally the usefulness of integrating NTN and TN is validated through experimental analysis.

cs.NI↗

arXiv2023

Towards Integrated Sensing and Communications for 6G: A Standardization Perspective

The radio communication division of the International Telecommunication Union (ITU-R) has recently adopted Integrated Sensing and Communication (ISAC) among the key usage scenarios for IMT-2030/6G. ISAC is envisioned to play a vital role in the upcoming wireless generation standards. In this work, we bring together several paramount and innovative aspects of ISAC technology from a global 6G standardization perspective, including both industrial and academic progress. Specifically, this article provides 6G requirements and ISAC-enabled vision, including various aspects of 6G standardization, benefits of ISAC co-existence, and integration challenges. Moreover, we present key enabling technologies, including intelligent metasurface-aided ISAC, as well as Orthogonal Time Frequency Space (OTFS) waveform design and interference management for ISAC. Finally, future aspects are discussed to open various research opportunities and challenges on the ISAC technology towards 6G wireless communications.

cs.IT↗

arXiv2020

Towards a Domain Specific Solution for a New Generation of Wireless Modems

Wireless cellular System on Chip (SoC) are experiencing unprecedented demands on data rate, latency use case variety. 5G wireless technologies require a massive number of antennas and complex signal processing to improve bandwidth and spectral efficiency. The Internet of Things is causing a proliferation in the number of connected devices, and service categories, such as ultra-reliable low latency, which will produce new use cases, such as self-driving cars, robotic factories, and remote surgery. In addressing these challenges, we can no longer rely on faster cores, or even more silicon. Modem software development is becoming increasingly error prone and difficult as the complexity of the applications and the architectures increase. In this report we propose a Wireless Domain Specific Solution that takes a Dataflow acceleration approach and addresses the need of the SoC to support dataflows that change with use case and user activity, while maintaining the Firm Real Time High Availability with low probability of Heisenbugs that is required in cellular modems. We do this by developing a Domain Specific Architecture that describes the requirements in a suitably abstracted dataflow Domain Specific language. A toolchain is described that automates translation of those requirements in an efficient and robust manner and provides formal guarantees against Heisenbugs. The dataflow native DSA supports the toolchain output with specialized processing, data management and control features with high performance and low power, and recovers rapidly from dropped dataflows while continuing to achieve the real time requirements. This report focuses on the dataflow acceleration in the DSA and the part of the automated toolchain that formally checks the performance and correctness of software running on this dataflow hardware. Results are presented and a summary of future work is given.

cs.AR↗

arXiv2020

Reconfigurable Intelligent Surface: Design the Channel -- a New Opportunity for Future Wireless Networks

In this paper, we survey state-of-the-art research outcomes in the burgeoning field of reconfigurable intelligent surface (RIS) in view of its potential for significant performance enhancement for next generation wireless communication networks by means of adapting the propagation environment. Emphasis has been placed on several aspects gating the commercially viability of a future network deployment. Comprehensive summaries are provided for practical hardware design considerations and broad implications of artificial intelligence techniques, so are in-depth outlooks on salient aspects of system models, use cases, and physical layer optimization techniques.

eess.SP↗