Blar i NTNU Open på forfatter "Cheffena, Michael"

Viser treff 41-60 av 67

    • 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 ...

    • Performance of Hybrid ARQ over Power Line Communications Channels 

      Mathur, Aashish; Ai, Yun; Cheffena, Michael; Bhatnagar, Manav (Chapter, 2020)
      Power line communications (PLC) system performance is severely affected by the presence of impulsive noise and channel gain. Many communication systems employ a combination of forward error correction and automatic repeat ...

    • Physical Layer Security of Hybrid Satellite-FSO Cooperative Systems 

      Ai, Yun; Mathur, Aashish; Cheffena, Michael; Bhatnagar, Manav R.; Lei, Hongjiang (Journal article; Peer reviewed, 2019)
      In this paper, we study the physical layer secrecy performance of a hybrid satellite and free-space optical (FSO) cooperative system. The satellite links are assumed to follow the Shadowed-Rician fading distribution; and ...

    • 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 ...

    • Physical-statistical channel model for signal effect by moving human bodies 

      Cheffena, Michael (Journal article; Peer reviewed, 2012)
      A novel physical-statistical channel model for simulating the signal effect by moving human bodies is presented. The human body is modeled as vertically oriented dielectric cylindrical volume. The received signal is assumed ...

    • Power delay profile analysis and modeling of industrial indoor channels 

      Ai, Yun; Cheffena, Michael; Li, Qihao (Chapter, 2015)
      In this paper, power delay profile (PDP) measurements of three different industrial indoor environments are presented. The measurements were performed in the frequency range of 800 MHz to 2.7 GHz using a vector network ...

    • Radio frequency measurements and capacity analysis for industrial indoor environments 

      Ai, Yun; Cheffena, Michael; Li, Qihao (Chapter, 2015)
      In this study, path-loss and shadowing measurement results for three different industrial indoor environments at 900, 1600, and 2450 MHz are presented. The results show that the one-slope model fits the measured path-loss ...

    • 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 ...

    • Results of a Ka Band Campaign for the Characterisation of Propagation Conditions for SatCom Systems at High Latitudes 

      Tjelta, Terje; Rytír, Martin; Bråten, Lars Erling; Grotthing, Per Arne; Cheffena, Michael; Håkegård, Jan Erik (Chapter, 2017)
      Satellite services in the High North are utilized extensively for both communication purposes and for earth and climate observations. This paper presents results of two year measurements at 20 GHz and co-sited meteorological ...

    • Secrecy enhancement of RF backhaul system with parallel FSO communication link 

      Ai, Yun; Mathur, Aashish; Lei, Hongjiang; Cheffena, Michael; Imran Shafique, Ansari (Peer reviewed; Journal article, 2020)
      This paper analyses the physical layer secrecy (PLS) performance of a hybrid free space optical and radio frequency (FSO/RF) communication system under a modified selection combining scheme. The transmission scheme takes ...

    • Secrecy Enhancement of RF Backhaul System with Parallel FSO Communication Link 

      Ai, Yun; Mathur, Aashish; Lei, Hongjiang; Cheffena, Michael; Ansari, Imran Shafique (Peer reviewed; Journal article, 2020)
      This paper analyses the physical layer secrecy (PLS) performance of a hybrid free space optical and radio frequency (FSO/RF) communication system under a modified selection combining scheme. The transmission scheme takes ...

    • Secrecy outage analysis of double shadowed Rician channels 

      Ai, Yun; Kong, Long; Cheffena, Michael (Journal article; Peer reviewed, 2019)
      The double shadowed Rician model was recently proposed to describe some realistic physical signal propagation phenomena, where a Rician faded signal is impacted by cascaded shadowing processes. In this letter, we study the ...

    • Secrecy Performance Analysis of Wireless Sensor Networks 

      Ai, Yun; Cheffena, Michael; Ohtsuki, Tomoaki; Zhuang, He (Journal article; Peer reviewed, 2019)
      Wireless sensor network (WSN) plays a fundamentally important role in the realization of Internet of Things and Industry 4.0. In this letter, we study the physical layer security performance of a large-scale ad hoc and ...

    • Secrecy Performance of Correlated α-μ Fading Channels 

      Mathur, Aashish; Ai, Yun; Cheffena, Michael; Kaddoum, Georges (Journal article; Peer reviewed, 2019)
      This paper investigates the secrecy performance of the classical Wyner’s wiretap model, where the main channel and eavesdropper channel experience correlated α-μ fading. Novel and exact expressions for the average secrecy ...

    • Secrecy Performance of Correlated α-μ Fading Channels 

      Mathur, Aashish; Ai, Yun; Cheffena, Michael; Kaddoum, Georges (Journal article; Peer reviewed, 2019)
      This paper investigates the secrecy performance of the classical Wyner’s wiretap model, where the main channel and eavesdropper channel experience correlated α-μ fading. Novel and exact expressions for the average secrecy ...

    • Secrecy performance of FSO communication systems with non-zero boresight pointing errors 

      Verma, Gyan Deep; Mathur, Aashish; Ai, Yun; Cheffena, Michael (Peer reviewed; Journal article, 2020)
      Free space optical (FSO) communication is a promising candidate for the next generation(5G and beyond) wireless communication systems, due to its merits (i.e. low latency, high data rate, and license-free band, among ...

    • Secure Outage Analysis of FSO Communications Over Arbitrarily Correlated Málaga Turbulence Channels 

      Ai, Yun; Mathur, Aashish; Kong, Long; Cheffena, Michael (Peer reviewed; Journal article, 2021)
      In this paper, we analyze the secrecy outage performance for more realistic eavesdropping scenario of free-space optical (FSO) communications, where the main and wiretap links are correlated. The FSO fading channels are ...

    • 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 ...