Mohammad Moltafet

Postdoctoral Researcher
Department of Electrical and Computer Engineering
University of California Santa Cruz
Phone: +18315295887
E-mail: mmoltafe@ucsc.edu

Research

My research interests include

Semantic Wireless Communications
Information-theoretic Security
Information Freshness
Stochastic Optimization
Machine Learning for Wireless Communication Applications

Selected Publications

M. Moltafet, H. R. Sadjadpour, and Z. Rezki, "An Unconditionally Secure Encryption Protocol for Cloud Storage," in Proceedings of IEEE International Symposium on Information Theory (ISIT), Athens, Greece, Jul. 7-12, 2024.
M. Moltafet, H. R. Sadjadpour, and Z. Rezki, "On the semantic security in the general bounded storage model: A new proof," IEEE Transactions on Information Forensics and Security, Early access, 2024.
M. Moltafet, M. Leinonen, M. Codreanu, and R. D. Yates, "Status update control and analysis under two-way delay," IEEE/ACM Transactions on Networking, vol. 31, no. 6, pp. 2918-2933, Jan. 2024.[pdf]
M. Moltafet, M. Leinonen, and M. Codreanu, "Moment generating function of the AoI in multi-source M/G/1/1 queueing systems," IEEE Transactions on Communications, vol. 70, no. 10, pp. 6503-6516, Oct. 2022.
M. Moltafet, M. Leinonen, and M. Codreanu, "AoI in Source-Aware Preemptive M/G/1/1 Queueing Systems: Moment Generating Function," in Proceedings of the IEEE International Symposium on Information Theory (ISIT), Helsinki, Finland, Jun. 26–Jul. 01, 2022, pp. 139-143.[pdf]
M. Moltafet, M. Leinonen, M. Codreanu, and N. Pappas, "Power minimization for AoI of information constrained dynamic control in wireless sensor networks," IEEE Transactions on Communications, vol. 70, no. 1, pp. 419-432, Jan. 2022.
M. Moltafet, M. Leinonen, and M. Codreanu, "Average AoI in multi-source systems with source-aware packet management," IEEE Transactions on Communications, vol. 69, no. 2, pp. 1121–1133, Feb. 2021.
M. Moltafet, M. Leinonen, and M. Codreanu, "Average age of information for a multi-source M/M/1 queueing model with packet management," in Proceedings of the IEEE International Symposium on Information Theory (ISIT), Los Angeles, CA, USA, Jun. 21–26, 2020, pp. 1765–1769.
M. Moltafet, M. Leinonen, and M. Codreanu, "On the age of information in multi-source queueing models," IEEE Transactions on Communications, vol. 68, no. 8, pp. 5003–5017, May 2020.
M. Moltafet, R. Joda, N. Mokari, M. R. Sabagh, and M. Zorzi, "Joint access and fronthaul radio resource allocation in PD-NOMA-based 5G networks enabling dual connectivity and CoMP," IEEE Transactions on Communications, vol. 66, no. 12, pp. 6463-6477, Dec. 2018.
M. Moltafet, P. Azmi, N. Mokari, M. R. Javan, and A. Mokdad, "Optimal and fair energy-efficient resource allocation for energy harvesting-enabled-PD-NOMA-based HetNets," IEEE Transactions on Wireless Communications, vol. 17, no. 3, pp. 2054-2067, Mar. 2018.
M. Moltafet, N. M. Yamchi, M. R. Javan, and P. Azmi, "Comparison study between PD-NOMA and SCMA," IEEE Transactions on Vehicular Technology, vol. 67, no. 2, pp. 1830-1834, Feb. 2018.

Mohammad Moltafet - About me

I received my M.Sc. degree (Ranked 1st) in communications engineering from Tarbiat Modares University, Tehran, Iran, in 2016, and my Ph.D. degree in communications engineering from the University of Oulu, Finland, in 2021. I was a Visiting Ph.D. Researcher at Linköping University, Sweden, in 2019, and a Postdoctoral Researcher at the University of Oulu, and the Technical University of Munich (TUM), Germany, in 2021 and 2022, respectively. Currently, I am a Postdoctoral Researcher at the University of California at Santa Cruz, USA.

Student Advising

December 2021–Present: Saeid Sadeghi-Vilni, Ph.D. Candidate, University of Oulu; research area: Information freshness for Ultra-reliable low-latency applications; jointly with Prof. Marian Codreanu; expected graduation: 2025.
October 2021–Present: Abolfazl Zakeri, Ph.D. Candidate, University of Oulu; research area: Reinforcement learning for semantic-aware communications; jointly with Prof. Marian Codreanu; expected graduation: 2024.

Awards & Grants

Tauno Tönning Foundation personal grant for doctoral studies, 2021 (a competitive award for researchers in Finland)
Nokia Foundation personal grant for doctoral studies, 2020 (a competitive award for researchers in Finland)
HPY Research Foundation personal grant for doctoral studies, 2020 (a competitive award for researchers in Finland)
Riitta ja Jorma J. Takanen Foundation personal grant for doctoral studies, 2020 (a competitive award for researchers in Finland)
Finnish Foundation for Technology Promotion personal grant for doctoral studies, 2019 (a competitive award for researchers in Finland)
Recognition to the Ph.D. student with the highest accumulated JUFO in the University of Oulu, Finland, during 2019 and 2020
M.Sc. Ranked 1st among all Communications Engineering M.Sc. students of Tarbiat Modares University, Tehran, Iran
The best M.Sc. thesis at Tarbiat Modares University, 2016 (Selected Thesis - 2016)

Interests Outside of Tech

In my spare time, I enjoy diving into Persian poetry. Whether it's the classics or more contemporary pieces, I find them fascinating. The way these poems express love, life, and deep thoughts is just beautiful. Poets like Hafez and Saadi Shirazi are especially close to my heart. To me, Persian poetry is like a treasure chest full of wisdom and inspiration that I like to explore whenever I get the chance.

Mohammad Moltafet - Journals

M. Moltafet, H. R. Sadjadpour, and Z. Rezki, "On the semantic security in the general bounded storage model: A new proof," IEEE Transactions on Information Forensics and Security, Early access, 2024.
M. Moltafet, M. Leinonen, M. Codreanu, and R. D. Yates, "Status update control and analysis under two-way delay," IEEE/ACM Transactions on Networking, vol. 31, no. 6, pp. 2918-2933, Jan. 2024.[pdf]
S. Sadeghi, M. Moltafet, M. Leinonen, and M. Codreanu, "Multi-source AoI-constrained resource minimization under HARQ: Heterogeneous sampling processes," IEEE Transactions on Vehicular Technology, vol. 73, no. 1, pp. 1084-1099, Jan. 2024.
A. Zakeri, M. Moltafet, M. Leinonen, and M. Codreanu, "Dynamic scheduling for minimizing AoI in resource-constrained multi-source relaying systems with stochastic arrivals," IEEE Transactions on Wireless Communications, vol. 23, no. 1, pp. 450-466, Dec. 2023.[pdf]
S. Sadeghi, M. Moltafet, M. Leinonen, and M. Codreanu, "AoI analysis and optimization in systems with computations-intensive updates," Journal of Communications and Networks, vol. 25, no. 5, pp. 585-597, Oct. 2023.
A. Zakeri, M. Moltafet, M. Leinonen, and M. Codreanu, "Query-age-optimal scheduling under sampling and transmission constraints," IEEE Communications Letter, vol. 27, no. 4, pp. 1205-1209, Apr. 2023.
M. Moltafet, M. Leinonen, and M. Codreanu, "Moment generating function of the AoI in multi-source M/G/1/1 queueing systems," IEEE Transactions on Communications, vol. 70, no. 10, pp. 6503-6516, Oct. 2022.
M. Moltafet, M. Leinonen, M. Codreanu, and N. Pappas, "Power minimization for AoI of information constrained dynamic control in wireless sensor networks," IEEE Transactions on Communications, vol. 70, no. 1, pp. 419-432, Jan. 2022.
M. Moltafet, M. Leinonen, and M. Codreanu, "Moment generating function of the AoI in a two-source system with packet management," IEEE Wireless Communications Letters, vol. 10, no. 4, pp. 882–886, Apr. 2021.
M. Moltafet, M. Leinonen, and M. Codreanu, "Average AoI in multi-source systems with source-aware packet management," IEEE Transactions on Communications, vol. 69, no. 2, pp. 1121–1133, Feb. 2021.
M. Moltafet, M. Leinonen, and M. Codreanu, "On the age of information in multi-source queueing models," IEEE Transactions on Communications, vol. 68, no. 8, pp. 5003–5017, May 2020.
M. Moltafet, M. Leinonen, and M. Codreanu, "Worst case age of information in wireless sensor networks: A multi-access channel," IEEE Wireless Communications Letters, vol. 9, no. 3, pp. 321–325, Mar. 2020.
A. Zakeri, M. Moltafet, and N. Mokari, "Joint radio resource allocation and SIC ordering in NOMA-based networks using submodularity and matching theory," IEEE Transactions on Vehicular Technology, vol. 68, no. 10, pp. 9761-9773, Oct. 2019.
M. Moltafet, S. Parsaeefard, M. R. Javan, and N. Mokari, "Robust radio resource allocation in MISO-SCMA assisted C-RAN in 5G networks," IEEE Transactions on Vehicular Technology, vol. 68, no. 6, pp. 5758-5768, Jun. 2019.
A. Mokdad, P. Azmi, N. Mokari, M. Moltafet, and M. Ghaffari-Miab, "Cross-layer energy-efficient resource allocation in PD-NOMA based H-CRANs: Implementation via GPU," IEEE Transactions on Mobile Computing, vol. 18, no. 6, pp. 1246-1259, 1 Jun. 2019.
M. Moltafet, Paeiz Azmi, Mohammad R Javan, Nader Mokari, and Ali Mokdad, "Optimal radio resource allocation to achieve a low BER in PD‐NOMA–based heterogeneous cellular networks," Transactions on Emerging Telecommunications Technologies, vol. 30, no. 5, pp. 1-23, May 2019.
M. Moltafet, R. Joda, N. Mokari, M. R. Sabagh, and M. Zorzi, "Joint access and fronthaul radio resource allocation in PD-NOMA-based 5G networks enabling dual connectivity and CoMP," IEEE Transactions on Communications, vol. 66, no. 12, pp. 6463-6477, Dec. 2018.
M. Moltafet, P. Azmi, N. Mokari, M. R. Javan, and A. Mokdad, "Optimal and fair energy-efficient resource allocation for energy harvesting-enabled-PD-NOMA-based HetNets," IEEE Transactions on Wireless Communications, vol. 17, no. 3, pp. 2054-2067, Mar. 2018.
M. Moltafet, N. M. Yamchi, M. R. Javan, and P. Azmi, "Comparison study between PD-NOMA and SCMA," IEEE Transactions on Vehicular Technology, vol. 67, no. 2, pp. 1830-1834, Feb. 2018.
M. Moltafet, N. Mokari, M. R. Javan, H. Saeedi, and H. Pishro-Nik, "A new multiple access technique for 5G: Power domain sparse code multiple access (PSMA)," IEEE Access, vol. 6, pp. 747–759, Nov. 2017.
M. Moltafet, A.Mokdad, P. Azmi, and N. Mokari, "Radio resource allocation in PD-NOMA based HCN system considering CoMP technology," International Journal of Digital Information and Wireless Communications. 8. pp. 260-264, 2017.
M. Moltafet, and P. Azmi, "Efficient resource allocation in NOMA-based HCN systems," The Modares Journal of Electrical Engineering, vol. 15, no. 3, pp. 36–41, 2016.
M. Moltafet, and P. Azmi, "Resource allocation in SCMA-based system," The Modares Journal of Electrical Engineering, vol. 15, no. 1, pp. 9–14, 2016.

Mohammad Moltafet - Conferences

M. Moltafet, H. R. Sadjadpour, and Z. Rezki, "An Unconditionally Secure Encryption Protocol for Cloud Storage," in Proceedings of IEEE International Symposium on Information Theory (ISIT), Athens, Greece, Jul. 7-12, 2024.
M. Moltafet, H. Sadjadpour, and Z. Rezki, "A Practical Perfect Secrecy Approach for IoBT Systems," in Proceedings of IEEE Military Communications Conference (MILCOM), Boston, MA, USA, Oct. 30–Nov. 03, 2023.
A. Zakeri, M. Moltafet, and M. Codreanu, "Semantic-aware real-time tracking of a Markov source under sampling and transmission costs," in Proceedings of the Annual Asilomar Conference on Signals, Systems and Computers, Pacific Grove, USA, Oct. 29-Nov 1, 2023.
A. Zakeri, M. Moltafet, M. Leinonen, and M. Codreanu, "Optimal semantic-aware sampling and transmission in energy harvesting systems through the AoII," in Proceedings of the IEEE Global Communications Conference (GLOBECOM), Kuala Lumpur, Malaysia, 2023.
S. S. Vilni, M. Moltafet, M. Leinonen and M. Codreanu, "AoI-Constrained Transmission Scheduling with HARQ and Heterogeneous Sampling Processes," in Proceedings of the International Conference on Computer Communications (INFOCOM) Workshop, New York, USA, 2023.
S. S. Vilni, M. Moltafet, M. Leinonen and M. Codreanu, "Average AoI Minimization in an HARQ-based Status Update System under Random Arrivals," in Proceedings of the IEEE International Conference on Internet of Things and Intelligence Systems (IoTaIS), BALI, Indonesia, 2022, pp. 160-165.
M. Moltafet, M. Leinonen, and M. Codreanu, "AoI in Source-Aware Preemptive M/G/1/1 Queueing Systems: Moment Generating Function," in Proceedings of the IEEE International Symposium on Information Theory (ISIT), Helsinki, Finland, Jun. 26–Jul. 01, 2022, pp. 139-143.[pdf]
A. Zakeri, M. Moltafet, M. Leinonen, and M. Codreanu, "Minimizing the AoI in multi-Source two-Hop systems under an average resource constraint," in Proceedings of the IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Helsinki, Finland, Jun. 2022.[pdf]
M. Moltafet, M. Leinonen, and M. Codreanu, "Moment generating function of the AoI in multi-source systems with computation-intensive status updates," in Proceedings of the IEEE Information Theory Workshop (ITW), 2021, pp. 1-5.
A. Zakeri, M. Moltafet, M. Leinonen, and M. Codreanu, "Minimizing AoI in resource-constrained multi-source relaying systems with stochastic arrivals," in Proceedings of the IEEE Global Communications Conference (GLOBECOM), 2021, pp. 1-5.
M. Moltafet, M. Leinonen, and M. Codreanu, "Source-aware packet management for computation-intensive status updating: MGF of the AoI," in Proceedings of the International Symposium on Wireless Communication Systems, Berlin, Germany, Sept. 6–9, 2021, pp. 1-6.
M. Moltafet, M. Leinonen, and M. Codreanu, "An exact expression for the average AoI in a multi-source M/M/1 queueing model," in Proceedings of the IEEE International Symposium on Personal, Indoor, and Mobile Radio Communications, London, United Kingdom, Sep. 1–3, 2020, pp. 1-6.
M. Moltafet, M. Leinonen, and M. Codreanu, "Average age of information in a multi-source M/M/1 queueing model with LCFS prioritized packet management," in Proceedings of the International Conference on Computer Communications (INFOCOM) Workshop, Toronto, Canada, Jul. 6-9, 2020, pp. 303–308.
M. Moltafet, M. Leinonen, and M. Codreanu, "Average age of information for a multi-source M/M/1 queueing model with packet management," in Proceedings of the IEEE International Symposium on Information Theory, Los Angeles, CA, USA, Jun. 21–26, 2020, pp. 1765–1769.
M. Moltafet, M. Leinonen, and M. Codreanu, "Average age of information for a multi-source M/M/1 queueing model with packet management and self-preemption in service," in Proceedings of the International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks, Volos, Greece, Jun. 15–19 2020, pp. 1–5.
M. Moltafet, M. Leinonen, and M. Codreanu, "An approximate expression for the average AoI in a multi-source M/G/1 queueing model," in Proceedings of the IEEE 6G Wireless Summit (6G SUMMIT), Levi, Finland, Mar. 17–20, 2020, pp. 1–5.
M. Moltafet, M. Leinonen, M. Codreanu, N. Pappas, "Power minimization in wireless sensor networks with constrained AoI using stochastic optimization," in Proceedings of the Annual Asilomar Conference on Signals, Systems and Computers, Pacific Grove, USA, Nov. 3–6, 2019, pp. 406–410.
M. Moltafet, M. Leinonen, and M. Codreanu, "Closed-Form Expression for the Average Age of Information in a Multi-Source M/G/1 Queueing Model," in Proceedings of the IEEE Information Theory Workshop (ITW), Visby, Sweden, Aug. 27–30, 2019, pp. 1-5.
M. Moltafet, M. Leinonen, and M. Codreanu, "Worst-case analysis of age of information in a shared-access channel," in Proceedings of the IEEE International Symposium on Wireless Communication Systems, Oulu, Finland, Aug. 27–30, 2019, pp. 613–617.
M. Jahandideh, M. Moltafet, M. Codreanu and M. Latva-Aho, "Low Complexity Sparse Channel Estimation for Wideband mmWave Systems: Multi-Stage Approach," in Proceedings of the IEEE Wireless Communications and Networking Conference (WCNC), Marrakesh, Morocco, Apr. 15-18, 2019, pp. 1-6.
M. Moltafet, N. Mokari, R. Joda, M. R. Sabagh and M. Zorzi, "Joint access and fronthaul resource allocation in dual connectivity and CoMP based networks," in Proceedings of the IEEE International Conference on Communications (ICC), Kansas City, MO, USA, May. 20-24, 2018, pp. 1-6.
A. Mokdad, M. Moltafet, P. Azmi and N. Mokari, "Robust radio resource allocation for heterogeneous traffic in PD-NOMA-based HCNs," in Proceedings of the IEEE Middle East and North Africa Communications Conference (MENACOMM), Jounieh, Lebanon, Apr. 18-20, 2018, pp. 1-6.
M. Moltafet, N. Mokari, M. R. Javan, H. Saeedi and H. Pishro-Nik, "PSMA for 5G: Network throughput analysis," in Proceedings of the IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), Montreal, QC, Canada, Oct. 8-13, 2017, pp. 1-6.
A. Mokdad, M. Moltafet, P. Azmi and N. Mokari, "Robust radio resource allocation for heterogeneous traffic in PD-NOMA-based cellular systems," in Proceedings of the IEEE Iranian Conference on Electrical Engineering (ICEE), Tehran, Iran, May, 2-7, 2017, pp. 1796-1801.
M. Moltafet, P. Azmi and N. Mokari, "Power minimization in 5G heterogeneous cellular networks," in Proceedings of the IEEE Iranian Conference on Electrical Engineering (ICEE), Shiraz, Iran, May, 10-12, 2016, pp. 234-238.

Mohammad Moltafet - Book Chapters and Academic Theses

M. Moltafet, M. Leinonen, and M. Codreanu, "Timely status updating via packet management in multi-source systems," Age of Information: Foundations and Applications, Cambridge University Press, Jan. 2023.
M. Moltafet, Information Freshness in Wireless Networks, Ph.D. thesis, Centre for Wireless Communications, University of Oulu. Acta Universitatis Ouluensis, Oulu, Finland, Jun. 2021.
M. Moltafet, Radio Resource Allocation in NOMA-based HCN systems, Master's thesis in Tarbiat Modares University, Tehran, Iran, Sept. 2016.