Principal Investigator: Tolga Mete Duman
Project Period: July 2020 – July 2023
Project Summary and Objectives
A key attribute of 5G and beyond wireless communications systems is their ability to connect (potentially) millions of machine-type devices to a single base station. The traffic generated by such devices is very different from those from conventional communication devices; for instance, such devices are only sporadically active. Energy efficiency is also of utmost concern as there is no way of changing the unit’s batteries. Indeed, an effective solution would be to equip such devices with energy harvesting capabilities to prolong the lifetime of such networks. Since it is impossible to coordinate the transmission of such a massive number of only sporadically active devices, random-access-based solutions are needed to enable their connectivity. Furthermore, dramatically different from the previously known multiple-access communication techniques, one needs to consider coding solutions where all the users utilize the same codebooks, and the receiver is interested only in the set of messages being transmitted (as opposed to user identities). With these drastically different requirements, it is imperative to design novel massive random-access approaches for use in 5G and beyond wireless communication systems.
In this project, our objective is to develop effective and practical solutions for massive random access both from a physical layer and a medium access protocol perspective. As a novel coding approach for the multiple-access channel (without the need for user identities), we propose to develop trellis-based code designs (coupled with periodic CRC checks and code concatenation). Similarly, as a practical physical layer approach, we consider zigzag decoding which can be used as an effective interference cancellation scheme without the need for decoding individual packages, which can enable the use of single-user coding solutions in the context of multiple-access. We also consider random access with energy harvesting type devices and aim at developing effective coded random-access techniques. Finally, we combine the new physical layer designs of the project with suitably designed medium access protocols and obtain an efficient and complete solution for the massive random access.
The fundamental problems addressed in our project will be solved using both analytical and simulation-based tools and can be summarized under four titles:
- Design of novel trellis and concatenation based coding approaches for multiple-access with users employing the same codebooks,
- Random access solutions with energy harvesting nodes,
- Physical layer design with zigzag decoding with applications in massive random access,
- Complete massive random access design based on advanced physical layer approaches.
List of Papers Published (as of August 2023)
A. Korhan Tanc and Tolga M. Duman, “Massive Random Access with Trellis Based Codes and Random Signatures,” IEEE Communications Letters, Vol. 25, No. 5, pp. 1496-1499, May 2021.
Talha Akyildiz, Umut Demirhan, and Tolga M. Duman, “Energy Harvesting Irregular Repetition ALOHA with Replica Concatenation,” IEEE Trans. on Wireless Communications, Vol. 20, no. 2, pp. 955-968, February 2021.
Mohammad Javad Ahmadi and Tolga M. Duman, “Random Spreading for Unsourced MAC with Power Diversity,” IEEE Communications Letters, vol. 25, no. 12, pp. 3995-3999, December 2021.
Mohammad Kazemi, Tolga M. Duman, and Muriel Medard, “Collision Resolution for Random Access,” IEEE Transactions on Wireless Communications, vol. 21, No. 5, pp. 3464-3477, May 2022.
Mert Ozates and Tolga M. Duman, “Unsourced Random Access over Frequency Selective Channels,” IEEE Communications Letters, vol. 27, no. 4, pp. 1230-1234, April 2023.
Javad Haghighat and Tolga M. Duman, “An Energy-Efficient Feedback-Aided Irregular Repetition Slotted ALOHA Scheme and Its Asymptotic Performance Analysis,” accepted for publication in IEEE Transactions on Wireless Communications, April 2023.
Javad Haghighat and Tolga M. Duman, “Analysis of Coded Slotted ALOHA with Energy Harvesting Nodes for Perfect and Imperfect Packet Recovery Scenarios,” accepted for publication in IEEE Transactions on Wireless Communications, February 2023.
Mohammad Javad Ahmadi, Mohammad Kazemi, and Tolga M. Duman, “Unsourced Random Access Using Multiple Stages of Orthogonal Pilots: MIMO and Single Antenna Structures,” accepted for publication in IEEE Transactions on Wireless Communications, June 2023.
Mert Ozates, Mohammad Kazemi and Tolga M. Duman, “A Slotted Pilot-Based Unsourced Random Access Scheme with a Multiple-Antenna Receiver”, accepted for publication in IEEE Trans. in Wireless Communications, August 2023.
List of Conference Papers (as of August 2023)
Mohammad Javad Ahmadi and Tolga M. Duman, “Unsourced Random Access with a Massive MIMO Receiver Using Multiple Stages of Orthogonal Pilots,” IEEE International Symposium on Information Theory, June 2022, Espoo, Finland.
Javad Haghighat and Tolga M. Duman, “Energy Efficiency Analysis of a Feedback-Aided IRSA Scheme,” IEEE International Symposium on Information Theory, June 2022, Espoo, Finland.
Sadra Seyedmasoumian and Tolga M. Duman, “Approximate Weight Distribution of Polarization-Adjusted Convolutional (PAC) Codes,” IEEE International Symposium on Information Theory, June 2022, Espoo, Finland.
Mert Ozates, Mohammad Kazemi and Tolga M. Duman, “A slotted unsourced random access scheme with a massive MIMO receiver,” in Proc. IEEE Global Commun. Conf. (GLOBECOM), pp. 2456-2461, December 2022, Rio de Janeiro, Brazil.
Mert Ozates, Mohammad Kazemi and Tolga M. Duman, “Unsourced random access with hardware impairments”, accepted for presentation in IEEE GLOBECOM 2023, December 2023, Kuala Lumpur, Malasia.
Mohammad Javad Ahmadi, Mohammad Kazemi, and Tolga M. Duman, “RIS-aided unsourced random access,” accepted for presentation in IEEE GLOBECOM 2023, December 2023, Kuala Lumpur, Malasia.