Browsing NTNU Open by Author "Mohamed, Marshed Kassim"

Now showing items 1-20 of 21

    • 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) ...

    • 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 ...

    • 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 ...

    • 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 ...

    • Free-Space Optical Communication: From Space to Ground and Ocean 

      Abrahamsen, Fredrik Ege; Ai, Yun; Wold, Knut; Mohamed, Marshed Kassim (Peer reviewed; Journal article, 2021)
      During the last decade, there has been a rapid advancement in the area of mobile broadband and wireless communication. The demand for higher data rate and capacity has continuously increased thanks to the growing need for ...

    • In-Body Sensor Communication: Trends and Challenges 

      Mohamed, Marshed Kassim; Maiseli, Baraka; Ai, Yun; Mkocha, Khadija; Al-Samman, Ahmed (Peer reviewed; Journal article, 2021)
      Wireless body area networks (WBANs) consist of interconnected devices that monitor the human body functions and the surrounding environment. Of these sensors, implants encounter multiple challenges due to their invasive ...

    • 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 ...

    • Indoor Propagation Analysis of IQRF Technology for Smart Building Applications 

      Bouzidi, Mohammed; Gupta, Nishu; Dalveren, Yaser; Mohamed, Marshed Kassim; Alaya Cheikh, Faouzi; Derawi, Mohammad (Peer reviewed; Journal article, 2022)
      Owing to its efficiency in the Internet of Things (IoT) applications in terms of low-power connectivity, IQRF (Intelligent Connectivity using Radio Frequency) technology appears to be one of the most reasonable IoT ...

    • On Hybrid-ARQ-Based Intelligent Reflecting Surface-Assisted Communication System 

      Ai, Yun; Mohamed, Marshed Kassim; Kong, Long; Al-Samman, Ahmed; Cheffena, Michael (Peer reviewed; Journal article, 2021)
      The intelligent reflecting surface (IRS) is an emerging technique to extend the wireless coverage. In this letter, the performance of hybrid automatic repeat request (hybrid-ARQ) for an IRS-assisted system is analyzed. ...

    • Performance of Full-DuplexWireless Back-Haul Link Under Rain Effects Using E-Band 73 GHz and 83 GHz in Tropical Area 

      Al-Samman, Ahmed; Mohamed, Marshed Kassim; Cheffena, Michael; Azmi, Marwan Hadri; Rahman, Tharek Abd. (Peer reviewed; Journal article, 2020)
      This paper presents rain attenuation effects on the performance of the full-duplex link in a tropical region based on one-year measurement data at 73.5- and 83.5-GHz E-band for distances of 1.8 km (longer links) and 300 m ...

    • Physical-Statistical Channel Model for Off-body Area Network 

      Mohamed, Marshed Kassim; Cheffena, Michael; Moldsvor, Arild; Fontán, Fernando Pérez (Journal article; Peer reviewed, 2017)
      Abstract: In this letter, a physical-statistical-based channel model for off-body wireless communications is presented. The model utilizes a dynamic human walking model, which provides detailed description of the movement ...

    • Propagation Measurements for IQRF Network in an Urban Environment 

      Bouzidi, Mohammed; Mohamed, Marshed Kassim; Dalveren, Yaser; Moldsvor, Arild; Alaya Cheikh, Faouzi; Derawi, Mohammad (Peer reviewed; Journal article, 2022)
      Recently, IQRF has emerged as a promising technology for the Internet of Things (IoT), owing to its ability to support short- and medium-range low-power communications. However, real world deployment of IQRF-based wireless ...

    • Radio Propagation Measurements in the Indoor Stairwell Environment at 3.5 and 28 GHz for 5G Wireless Networks 

      Al-Samman, Ahmed; Mohamed, Marshed Kassim; Cheffena, Michael (Journal article; Peer reviewed, 2020)
      To cover the high demand for wireless data services for different applications in the wireless networks, different frequency bands below 6 GHz and in millimeter-wave (mm-Wave) above 24 GHz are proposed for the fifth ...

    • Rain Attenuation Measurements and Analysis at 73 GHz E-Band Link in Tropical Region 

      Al-Samman, Ahmed; Mohamed, Marshed Kassim; Ai, Yun; Cheffena, Michael; Azmi, Marwan Hadri; Rahman, Tharek (Peer reviewed; Journal article, 2020)
      This letter presents the rainfall intensity and rain attenuation analysis in tropical region based on a one-year measurement using the 73.5 GHz E-band link of 1.8 km with three rain gauges installed along the path. The ...

    • Received Signal Strength Based Gait Authentication 

      Mohamed, Marshed Kassim; Cheffena, Michael (Journal article; Peer reviewed, 2018)
      Expansion of wireless body area networks applications, such as health-care, m-banking, and others has lead to vulnerability of privacy and personal data. An effective and unobtrusive natural method of authentication is ...

    • Statistical Analysis of Rain at Millimeter Waves in Tropical Area 

      Al-Samman, Ahmed; Cheffena, Michael; Mohamed, Marshed Kassim; Azmi, Marwan Hadri; Ai, Yun (Journal article; Peer reviewed, 2020)
      The high frequencies of millimeter wave (mm-wave) bands have been recognized for the fifth generation (5G) and beyond wireless communication networks. However, the radio propagation channel at high frequencies can be largely ...

    • The Application of Lognormal Mixture Shadowing Model for B2B Channels 

      Cheffena, Michael; Mohamed, Marshed Kassim (Journal article; Peer reviewed, 2018)
      In this article, a Lognormal mixture shadowing model based on a cluster concept is utilized in the modeling of body-to-body (B2B) channels for different running and cycling activities. The mixture model addresses the ...