Browsing NTNU Open by Author "Ai, Yun"
Now showing items 1-20 of 37
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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. ... -
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 ... -
Effective Rate Evaluation of RIS-Assisted Communications Using the Sums of Cascaded α-μ Random Variates
Kong, Long; Ai, Yun; Symeon, Chatzinotas; Björn, Ottersten (Peer reviewed; Journal article, 2021)This paper begins with the characterization of the sum of M versions of cascaded α-μ (equivalently, N*(α-μ)) distributed random variates (RVs), and later on, explores the feasibility and applicability of the obtained results ... -
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 ... -
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 ... -
Intercept Probability Analysis over the Cascaded Fisher-Snedecor ℱ Fading Wiretap Channels
Kong, Long; Ai, Yun; He, Jiguang; Rajatheva, Nandana; Kaddoum, Georges (Chapter, 2019)In this paper, we have investigated the physical layer security over cascaded Fisher-Snedecor ℱ fading channels in the presence of randomly distributed eavesdroppers. To characterize the eavesdroppers’ intercept capability, ... -
Large Intelligent Surfaces With Discrete Set of Phase-Shifts Communicating Through Double-Rayleigh Fading Channels
Figueiredo, Felipe A. P. De; Facina, Michelle S. P.; Ferreira, Ricardo C.; Ai, Yun; Ruby, Rukhsana; Pham, Quoc-Viet; Fraidenraich, Gustavo (Peer reviewed; Journal article, 2021)Despite many studies already published on large intelligent surfaces (LIS), there are still some gaps in mathematical models in the face of possible scenarios. In this work, we evaluate the performance of a single-input ... -
LTE Uplink Transmission Scheme
Surgiewicz, Rafal; Strom, Niklas; Ahmed, Anser; Ai, Yun (Research report, 2014)The Long Term Evolution (LTE) standard requires an uplink transmission rate of up to 86 Mbps. In order to support such a high data rate and avoid the high Peak-to-Average Power Ratio (PAPR) disadvantage in Orthogonal-FDMA, ... -
Methodology for Power-Aware Coherent Receiver Design
Ahmad, Tauseef; Ai, Yun; Muralidharan, Pavithra; Irukulapati, Naga Vishnukanth; Johannisson, Pontus; Wymeersch, Henk; Agrell, Erik; Larsson-Edefors, Per; Karlsson, Magnus (Research report, 2013) -
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. ... -
On Multi-Hop Decode-and-Forward Cooperative Relaying for Industrial Wireless Sensor Networks
Ai, Yun; Cheffena, Michael (Journal article; Peer reviewed, 2017)Wireless sensor networks (WSNs) will play a fundamental role in the realization of Internet of Things and Industry 4.0. Arising from the presence of spatially distributed sensor nodes in a sensor network, cooperative ... -
On Physical Layer Security of Double Rayleigh Fading Channels for Vehicular Communications
Ai, Yun; Cheffena, Michael; Mathur, Aashish; Lei, Hongjiang (Journal article; Peer reviewed, 2018)In this letter, we study the physical layer secrecy performance of the classic Wyner's wiretap model over double Rayleigh fading channels for vehicular communications links. We derive novel and closed-form expressions for ... -
On Physical Layer Security of α-η-κ-μ Fading Channels
Mathur, Aashish; Ai, Yun; Bhatnagar, Manav R.; Cheffena, Michael; Ohtsuki, Tomoaki (Journal article; Peer reviewed, 2018)In this letter, we study the secrecy performance of the classic Wyner’s wiretap model, where the main and eavesdropper channels are modeled by a general and versatile α-η-κ-µ fading model. Novel and exact expressions of ... -
Path-Loss Prediction for an Industrial Indoor Environment Based on Room Electromagnetics
Ai, Yun; Andersen, Jørgen Bach; Cheffena, Michael (Journal article; Peer reviewed, 2017)A simple approach of path-loss and root mean square delay spread prediction for indoor propagation environment is developed based on the room electromagnetics theory. The indoor room environment is interpreted as a lossy ... -
Performance Analysis of a Dual-Hop Wireless-Power Line Mixed Cooperative System
Mathur, Aashish; Bhatnagar, Manav R.; Ai, Yun; Cheffena, Michael (Journal article; Peer reviewed, 2018)Wireless communications and power line communications (PLC) are essential components for smart grid communications. This paper analyses the performance of a dual-hop wireless-power line mixed communication setup employing ... -
Performance Analysis of Hybrid-ARQ over Full-Duplex Relaying Network Subject to Loop Interference under Nakagami- Fading Channels
Ai, Yun; Cheffena, Michael (Chapter, 2017)In this paper, the outage performance of hybrid automatic repeat request (hybrid-ARQ) over a full- duplex decode-and-forward relay network is analyzed. Nakagami-m distribution is assumed for fading channels such that the ...