Blar i NTNU Open på forfatter "Cheffena, Michael"
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A Dynamic Channel Model for Indoor Wireless Signals: Working Around Interference Caused by Moving Human Bodies
Mohamed, Marshed Kassim; Cheffena, Michael; Fontán, Fernando Pérez; Moldsvor, Arild (Journal article; Peer reviewed, 2018)The use of indoor wireless devices has substantially increased in recent years. This escalation is due to the expansion of traditional communication devices, such as mobile phones and laptop computers, to less traditional ... -
Buffer Delay Improvement in Gait-Cycle-Driven Transmission Power Control Scheme for WBAN
Mohamed, Marshed Kassim; Cheffena, Michael; Ai, Yun; Al-Samman, Ahmed (Peer reviewed; Journal article, 2020)Due to the dynamic nature of the wireless body area network (WBAN) channels, there is a need for dynamic transmission power control (TPC) to increase their energy efficiency. The existing gait-cycle-driven TPC (G-TPC) ... -
Capacity Analysis of PLC Systems over Rayleigh Fading Channels with Nakagami- Additive Noise
Ai, Yun; Cheffena, Michael (Chapter, 2016)Power line communication (PLC) is an emerging technology for the realization of smart grid and home automation. It utilizes existing power line infrastructure for data communication in addition to the transmission of power. ... -
Channel-based Optimal Back-off Delay Control in Delay-Constrained Industrial WSNs
Li, Qihao; Zhang, Ning; Cheffena, Michael; Shen, Xuemin (Sherman) (Journal article; Peer reviewed, 2019)Recent developments in industrial wireless sensor networks (IWSNs) have revolutionized industrial automation systems. However, harsh industrial environment poses great challenges to a time-critical and reliable wireless ... -
Channel-based Sampling Rate and Queuing State Control in Delay-Constraint Industrial WSNs
Li, Qihao; Zhang, Kuan; Cheffena, Michael; Shen, Xuemin (Sherman) (Journal article, 2017)Industrial Wireless Sensor Networks (IWSNs) improve the transmission precision of control signaling as well as contributing to the real-time data monitoring and instrument fault diagnosing throughout the manufacturing ... -
Channel-based Sybil Detection in Industrial Wireless Sensor Networks: a Multi-kernel Approach
Li, Qihao; Zhang, Kuan; Cheffena, Michael; Shen, Xuemin (Sherman) (Journal article, 2017)Industrial Wireless Sensor Networks (IWSNs) integrate various types of sensors to measure and control industrial production. However, the unattended open environment makes IWSNs vulnerable to malicious attacks, such as ... -
Characterization of dynamic wireless body area network channels during walking
Mohamed, Marshed Kassim; Joseph, Wout; Vermeeren, Günter; Tanghe, Emmeric; Cheffena, Michael (Journal article; Peer reviewed, 2019)In this work, finite-difference time-domain was used for the investigation of dynamic wireless body area network channel characteristics during walking, thus accounting for dynamic aspects and body postures. This involves ... -
Characterization of Off-Body Area Network Channels During Walking
Mohamed, Marshed Kassim; Joseph, Wout; Varmeeren, Günter; Tanghe, Emmeric; Cheffena, Michael (Journal article; Peer reviewed, 2019)In this work, the off-body area network channel characteristics during walking were investigated using finite difference time-domain. The channels were investigated in terms of fade variation and the correlation between ... -
Characterization of the Body-to-Body Propagation Channel for Subjects during Sports Activities
Mohamed, Marshed Kassim; Cheffena, Michael; Moldsvor, Arild (Journal article; Peer reviewed, 2018)Body-to-body wireless networks (BBWNs) have great potential to find applications in team sports activities among others. However, successful design of such systems requires great understanding of the communication channel ... -
Communication Technologies for Smart Grid: A Comprehensive Survey
Abrahamsen, Fredrik Ege; Ai, Yun; Cheffena, Michael (Peer reviewed; Journal article, 2021)With the ongoing trends in the energy sector such as vehicular electrification and renewable energy, the Smart Grid (SG) is clearly playing a more and more important role in the electric power system industry. One essential ... -
A Comparative Study of Wireless Channel Propagation Characteristics in Industrial and Offce Environments
Ai, Yun; Cheffena, Michael (Research report, 2015)This paper presents the comparative results of channel measurements in an industrial facility and an indoor office. The frequency domain channel measurements have been carried out in the frequency band of 0.8.2.7 GHz. ... -
Comprehensive Physical Layer Security Analysis of FSO Communications over Málaga Channels
Ai, Yun; Mathur, Aashish; Verma, Gyan Deep; Kong, Long; Cheffena, Michael (Peer reviewed; Journal article, 2020)In this paper, we study the physical layer security of free-space optical (FSO) communications under different eavesdropping scenarios. More specifically, the secrecy performance of FSO communication employing intensity ... -
Dynamic Channel Models for Wireless Body Area Networks
Mohamed, Marshed Kassim (Doctoral theses at NTNU;2018:240, Doctoral thesis, 2018)The advancements in technology have made it possible to create a network of implant and wearable nodes around the human body known as wireless body area network (WBAN). These communication systems have potentially great ... -
Effect of Weather Condition on LoRa IoT Communication Technology in a Tropical Region: Malaysia
Al-Samman, Ahmed; Cheffena, Michael; Elijah, Olakunle; Rahim, Sharul Kamal Abdul; Sittakul, Vitawat; Din, Jafri Bin; Tharek, Abdul R. (Peer reviewed; Journal article, 2021)An experimental study on the effect of weather conditions such as solar radiation, humidity, temperature, and rain on the Long Range (LoRa) communication in a tropical region (Malaysia) via a campus environment has been ... -
Effective Throughput Analysis of α-η-κ-µ Fading Channels
Ai, Yun; Mathur, Aashish; Kong, Long; Cheffena, Michael (Peer reviewed; Journal article, 2020)The α-η-κ-μ fading model is a very useful instrument to accurately describe various radio wave propagation scenarios. In this paper, we study the effective throughput performance of communication systems over the α-η-κ-μ ... -
Empirical Path Loss Models for Wireless Sensor Network Deployment in Snowy Environments
Cheffena, Michael; Mohamed, Marshed Kassim (Journal article; Peer reviewed, 2017)Abstract: In this paper, practical sensor nodes are utilized to study the path loss effects of wireless sensor networks (WSNs) at 2.425 GHz in a ground covered by snow at different heights from the ground. The measurement ... -
Exploiting Dispersive Power Gain and Delay Spread for Sybil Detection in Industrial WSNs: A Multi-Kernel Approach
Li, Qihao; Cheffena, Michael (Journal article; Peer reviewed, 2019)Industrial wireless sensor networks (IWSNs) promote innovations in the industry such as structural status mapping, instrument fault diagnosing, and oriented automation system associating. However, due to the shared nature ... -
Game-Theoretical Analysis of PLC System Performance in the Presence of Jamming Attacks
Ai, Yun; Bhatnagar, Manav R.; Cheffena, Michael; Mathur, Aashish; Sedakov, Artem (Chapter, 2017)In this paper, we investigate the performance of power line communication (PLC) network in the presence of jamming attacks. The legitimate nodes of the PLC network try to communicate with the anchor node of the network ... -
Geometry-Based Modeling of Wideband Industrial Indoor Radio Propagation Channels
Ai, Yun; Hogstad, Bjørn Olav; Cheffena, Michael; Pätzold, Matthias Uwe (Chapter, 2015)In this paper, we present a geometrical scattering model for a typical class of industrial indoor environments. The proposed industrial reference model takes into account scattering components arising from metallic structures ... -
Indoor Channel Estimation Using Single-Snapshot Wideband Measurement
Ai, Yun; Cheffena, Michael; Mohamed, Marshed Kassim; Al-Samman, Ahmed (Chapter, 2020)The successful design of communication systems generally requires knowledge of various channel characteristic parameters. This paper utilizes the reverberation time extracted from single-snapshot wideband measurement to ...