Zohreh Hajiakhondi-Meybodi

ORCID: 0000-0001-7159-326X
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About
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Research Areas
  • Caching and Content Delivery
  • Opportunistic and Delay-Tolerant Networks
  • Indoor and Outdoor Localization Technologies
  • Cooperative Communication and Network Coding
  • Bluetooth and Wireless Communication Technologies
  • UAV Applications and Optimization
  • Underwater Vehicles and Communication Systems
  • COVID-19 Digital Contact Tracing
  • IoT and Edge/Fog Computing
  • Mobile Crowdsensing and Crowdsourcing
  • Complex Network Analysis Techniques
  • Privacy-Preserving Technologies in Data
  • Human Mobility and Location-Based Analysis
  • Speech and Audio Processing
  • Energy Efficient Wireless Sensor Networks
  • Wireless Networks and Protocols
  • Opinion Dynamics and Social Influence
  • Advanced Wireless Network Optimization
  • Anomaly Detection Techniques and Applications
  • Machine Fault Diagnosis Techniques
  • Optical Wireless Communication Technologies
  • Target Tracking and Data Fusion in Sensor Networks
  • Risk and Safety Analysis
  • Ultra-Wideband Communications Technology
  • Millimeter-Wave Propagation and Modeling

Concordia University
2020-2024

Yazd University
2018

With expected widespread implementation of 5G networks and Internet Things (IoT), indoor localization is to become even further importance. Although Global Positioning System (GPS) ensures efficient outdoor localization, generally speaking, systems fail provide the same level efficiency. In this regard, there has been recent attention Angle Arrival (AoA) with application on Switch Antenna Array (SAA), as an method due its potential in determining location low estimation error. The AoA,...

10.23919/fusion45008.2020.9190573 article EN 2020-07-01

Recent advancements in Internet of Things (IoTs) have brought about a surge interest indoor positioning for the purpose providing reliable, accurate, and energy-efficient navigation/localization systems. Ultra Wide Band (UWB) technology has been emerged as potential candidate to satisfy aforementioned requirements. Although UWB can enhance accuracy due use wide-frequency spectrum, there are key challenges ahead its efficient implementation. On one hand, achieving high precision relies on...

10.1109/tsp.2022.3171678 article EN IEEE Transactions on Signal Processing 2022-01-01

Bluetooth Low Energy (BLE) is one of the key technologies empowering Internet Things (IoT) for indoor positioning. In this regard, Angle Arrival (AoA) localization most reliable techniques because its low estimation error. BLE-based AoA localization, however, in infancy as only recently direction-finding feature introduced to BLE specification. Furthermore, AoA-based approaches are prone noise, multi-path, and path-loss effects. The paper proposes an efficient Convolutional Neural Network...

10.1109/icassp39728.2021.9413455 article EN ICASSP 2022 - 2022 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) 2021-05-13

The paper is motivated by the urgent need, imposed COVID-19 pandemic, for trustworthy access to secure communication systems with highest achievable availability and minimum latency. In this regard, we focus on an ultra-dense wireless network consisting of Femto Access Points (FAPs) Unmanned Aerial Vehicles (UAVs), known as caching nodes, where there are more than one possible node handle user's request. To efficiently cope dynamic topology networks time-varying behavior ground users, our...

10.1109/access.2021.3060323 article EN cc-by IEEE Access 2021-01-01

Recently, as a consequence of the COVID-19 pandemic, dependence on telecommunication for remote learning/working and telemedicine has significantly increased. In this context, preserving high Quality Service (QoS) maintaining low-latency communication are paramount importance. cellular networks, incorporation unmanned aerial vehicles (UAVs) can result in enhanced connectivity outdoor users due to probability establishing Line Sight (LoS) links. The UAV's limited battery life its signal...

10.1109/jiot.2021.3127150 article EN IEEE Internet of Things Journal 2021-11-11

The cache replacement policy is a crucial phase in caching-based systems that deal with the process of selecting applicable contents. In this paper, we propose two novel algorithms based on dataset obtained from typical wireless femto network. first algorithm, called Weighted Least Frequently used an Adaptive Time Window (WLF-ATW), aim to make balance between network's traffic and recognition popular WLF-ATW algorithm takes frequency recency information files into account ascertain...

10.1109/tmc.2018.2864164 article EN IEEE Transactions on Mobile Computing 2018-08-07

Mobile Edge Caching (MEC) is a revolutionary technology for the Sixth Generation (6G) of wireless networks with promise to significantly reduce users’ latency via offering storage capacities at edge network. The efficiency MEC network, however, critically depends on its ability dynamically predict/update caching nodes top-K popular contents. Conventional statistical schemes are not robust time-variant nature underlying pattern content requests, resulting in surge interest using Deep Neural...

10.1109/icassp49357.2023.10097122 article EN ICASSP 2022 - 2022 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) 2023-05-05

Coded/uncoded content placement in Mobile Edge Caching (MEC) has evolved as an efficient solution to meet the significant growth of global mobile data traffic by boosting diversity storage caching nodes. To dynamic nature historical request pattern multimedia contents, main focus recent researches been shifted develop data-driven and real-time schemes. In this regard with assumption that users’ preferences remain unchanged over a short horizon, Top-퐾 popular contents are identified output...

10.2139/ssrn.4583764 preprint EN 2023-01-01

Bluetooth Low Energy (BLE) is one of the key enabling technologies emerging Internet Things (IoT) concept. When it comes to BLE-based dynamic indoor tracking, however, due drastic fluctuations Received Signal Strength Indicator (RSSI), highly acceptable accuracies are not yet achieved. Although very recent introduction BLE v 5.1 promises prosperous future for following two issues in path: (i) Despite being age big data with huge emphasis on reproducibility research, there no unified dataset...

10.23919/eusipco47968.2020.9287547 article EN 2021 29th European Signal Processing Conference (EUSIPCO) 2020-12-18

Recent developments and advancements in wireless networks have brought about new challenges including the backhaul bottleneck content download latency. The paper focuses on an enterprise network consisting of various candidate caching nodes to serve users' requests such as Femto Access Points (FAPs) Mobile Users (MUs), supported by Device-to-Device (D2D) communications. Due fact that user's mobility is one inherent features massive networks, where FAPs operate open access mode, small...

10.1109/tvt.2020.3003850 article EN IEEE Transactions on Vehicular Technology 2020-06-24

Internet of Things (IoT) has penetrated different aspects our modern life where smart sensors enabled with Bluetooth Low Energy (BLE) are deployed increasingly within surrounding indoor environments. BLE-based localization is, typically, performed based on Received Signal Strength Indicator (RSSI), which suffers from drawbacks due to its significant fluctuations. In this paper, we focus a multiplemodel estimation framework for analyzing and addressing effects orientation BLE-enabled device...

10.23919/eusipco47968.2020.9287489 article EN 2021 29th European Signal Processing Conference (EUSIPCO) 2020-12-18

Angle of Arrival (AoA) approach with applications to Bluetooth Low Energy (BLE) has been recognized as an effective indoor localization method because its ability for position determination low estimation error. However, there are several issues including Carrier Frequency Offset (CFO), multipath effect, Inter-Symbol Interference (ISI), noise, and phase shifting faced by the AoA. To tackle these issues, we first highlight wireless signal model in BLE standard formulate transmitted signal,...

10.1109/smc42975.2020.9283088 article EN 2022 IEEE International Conference on Systems, Man, and Cybernetics (SMC) 2020-10-11

Recently, as a consequence of the coronavirus disease (COVID-19) pandemic, dependence on contact tracing (CT) models has significantly increased to prevent spread this highly contagious virus and be prepared for potential future ones. Since spreading probability novel in indoor environments is much higher than that outdoors, there an urgent unmet quest develop/design efficient, autonomous, trustworthy, secure CT solutions. Despite such urgency, field still its infancy. This article addresses...

10.1109/jiot.2022.3223329 article EN IEEE Internet of Things Journal 2022-11-18

Recently, as a consequence of the COVID-19 pandemic, dependence on Contact Tracing (CT) models has significantly increased to prevent spread this highly contagious virus and be prepared for potential future ones. Since spreading probability novel coronavirus in indoor environments is much higher than that outdoors, there an urgent unmet quest develop/design efficient, autonomous, trustworthy, secure CT solutions. Despite such urgency, field still its infancy. The paper addresses gap proposes...

10.48550/arxiv.2108.08275 preprint EN cc-by arXiv (Cornell University) 2021-01-01

Ultra-Wideband (UWB) is one of the key technolo-gies empowering Internet Thing (IoT) concept to per-form reliable, energy-efficient, and highly accurate monitoring, screening, localization in indoor environments. Performance UWB-based systems, however, can significantly degrade because Non Line Sight (NLoS) connections between a mobile user UWB beacons. To mitigate destructive effects NLoS connections, we target development Reinforcement Learning (RL) anchor selection framework that...

10.1109/globecom48099.2022.10001559 article EN GLOBECOM 2022 - 2022 IEEE Global Communications Conference 2022-12-04

Smart grid is susceptance to a variety of cyber attacks, among which False Data Injection Attacks (FDIA) are shown be significantly disruptive nature. Complex, distributed, and interconnected aspects smart grids make detection stealthy FDIAs with high accuracy challenging. To address this issue, the paper proposes an innovative Adaptive Multi-Level Features Classification for Stealthy FDIA Detection (AMLFC-SFD) based on Alternating Current (AC) state estimation. More specifically, we focus...

10.1109/smc42975.2020.9282943 article EN 2022 IEEE International Conference on Systems, Man, and Cybernetics (SMC) 2020-10-11

Mobile Edge Caching (MEC) integrated with Deep Neural Networks (DNNs) is an innovative technology significant potential for the future generation of wireless networks, resulting in a considerable reduction users' latency. The MEC network's effectiveness, however, heavily relies on its capacity to predict and dynamically update storage caching nodes most popular contents. To be effective, DNN-based popularity prediction model needs have ability understand historical request patterns content,...

10.48550/arxiv.2303.12097 preprint EN cc-by arXiv (Cornell University) 2023-01-01

Mobile-edge caching (MEC) integrated with deep neural networks (DNNs) is an innovative technology significant potential for the future generation of wireless networks, resulting in a considerable reduction users' latency. The mobile-edge network's effectiveness, however, heavily relies on its capacity to predict and dynamically update storage nodes most popular contents. To be effective, DNN-based popularity prediction model needs have ability understand historical request patterns content,...

10.1109/jiot.2023.3314667 article EN IEEE Internet of Things Journal 2023-09-19

Ultra-Wideband (UWB) is one of the key technologies empowering Internet Thing (IoT) concept to perform reliable, energy-efficient, and highly accurate monitoring, screening, localization in indoor environments. Performance UWB-based systems, however, can significantly degrade because Non Line Sight (NLoS) connections between a mobile user UWB beacons. To mitigate destructive effects NLoS connections, we target development Reinforcement Learning (RL) anchor selection framework that...

10.48550/arxiv.2205.08422 preprint EN cc-by arXiv (Cornell University) 2022-01-01

Coded/uncoded content placement in Mobile Edge Caching (MEC) has evolved as an efficient solution to meet the significant growth of global mobile data traffic by boosting diversity storage caching nodes. To dynamic nature historical request pattern multimedia contents, main focus recent researches been shifted develop data-driven and real-time schemes. In this regard with assumption that users' preferences remain unchanged over a short horizon, Top-K popular contents are identified output...

10.48550/arxiv.2210.05874 preprint EN cc-by arXiv (Cornell University) 2022-01-01
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