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Dr Petros Karadimas' Outputs (18)

Closed-Form Pathloss Formulation for IRS-Assisted 6G Wireless Networks (2025)
Presentation / Conference Contribution
Karadimas, P. (2025, January). Closed-Form Pathloss Formulation for IRS-Assisted 6G Wireless Networks. Presented at 2025 IEEE 22nd Consumer Communications & Networking Conference (CCNC), Las Vegas, NV, USA

Intelligent reflecting surfaces (IRSs) are smart devices that can manipulate electromagnetic wave propagation to optimize performance of future 6G wireless networks. In IRS-assisted wireless communications, one of the most important performance metri... Read More about Closed-Form Pathloss Formulation for IRS-Assisted 6G Wireless Networks.

Multi-Antenna Array Topologies Optimization for Future Wireless Networks by Employing Particle Swarm Optimization (2019)
Presentation / Conference Contribution
Huang, Y. K., Karadimas, P., & Sohrab, A. P. (2019, June). Multi-Antenna Array Topologies Optimization for Future Wireless Networks by Employing Particle Swarm Optimization. Presented at 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring), Rome, Italy

The purpose of this work is to design novel antenna array topologies that maximize channel capacity. Accordingly, we employ the particle swarm optimization (PSO) algorithm as an effective technique in similar electromagnetic problems. We use a novel... Read More about Multi-Antenna Array Topologies Optimization for Future Wireless Networks by Employing Particle Swarm Optimization.

Covariance Matrix Evaluation of a Diversity Slot Antenna for Vehicular Communications (2019)
Presentation / Conference Contribution
Sohrab, A. P., Karadimas, P., & Huang, Y. (2019, July). Covariance Matrix Evaluation of a Diversity Slot Antenna for Vehicular Communications. Presented at 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, Atlanta, GA, USA

A dual-port slot antenna is proposed for vehicular communications. The antenna works at 5.9 GHz in intelligent transportation system (ITS) band. The diversity performance of the design is evaluated using a novel covariance matrix methodology based on... Read More about Covariance Matrix Evaluation of a Diversity Slot Antenna for Vehicular Communications.

Optimal Antenna Array Topologies for Energy Efficiency Maximization by Employing Particle Swarm Optimization (2019)
Presentation / Conference Contribution
Huang, Y., Karadimas, P., & Sohrab, A. P. (2019, September). Optimal Antenna Array Topologies for Energy Efficiency Maximization by Employing Particle Swarm Optimization. Presented at 2019 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC), Granada, Spain

The purpose of this work is to design novel antenna array topologies that maximize the energy efficiency (EE) in multiple-input-multiple-output (MIMO) wireless systems. To provide insights into EE optimization issues, the particle swarm optimization... Read More about Optimal Antenna Array Topologies for Energy Efficiency Maximization by Employing Particle Swarm Optimization.

Diversity Antenna for Vehicular Communications in Microwave and mm-Wave Bands (2019)
Presentation / Conference Contribution
Sohrab, A. P., Karadimas, P., & Huang, Y. (2019, September). Diversity Antenna for Vehicular Communications in Microwave and mm-Wave Bands. Presented at 2019 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC), Granada, Spain

A dual band diversity antenna is proposed for vehicular communications. The antenna works at both 5.9 GHz and 60 GHz simultaneously which makes it a suitable candidate for next generation intelligent transportation systems (ITS). High isolation of th... Read More about Diversity Antenna for Vehicular Communications in Microwave and mm-Wave Bands.

Optimizing Turbo Codes for Secret Key Generation in Vehicular Ad Hoc Networks (2019)
Presentation / Conference Contribution
Ismail, D. K. B., Karadimas, P., Epiphaniou, G., & Al-Khateeb, H. (2019, January). Optimizing Turbo Codes for Secret Key Generation in Vehicular Ad Hoc Networks. Presented at 1st American University in the Emirates International Research Conference, Dubai, UAE

We present an algorithm that allows two users to establish a symmetric cryptographic key by incorporating the most important features of the wireless channel in vehicle-to-vehicle (V2V) communication. Non-reciprocity compensation is combined with tur... Read More about Optimizing Turbo Codes for Secret Key Generation in Vehicular Ad Hoc Networks.

Flexible RFID Patch for Food Spoilage Monitoring (2018)
Presentation / Conference Contribution
Yuan, M., Ghannam, R., Karadimas, P., & Heidari, H. (2018, October). Flexible RFID Patch for Food Spoilage Monitoring. Presented at 2018 IEEE Asia Pacific Conference on Postgraduate Research in Microelectronics and Electronics (PrimeAsia), Chengdu, China

When food is reversed under an inappropriate situation, for example inadequate temperature, foodstuff would turn rotten as a result of the rapid breed of food spoilage bacteria under warm and wet circumstances where bacteria can be easily generated,... Read More about Flexible RFID Patch for Food Spoilage Monitoring.

Quantisation feasibility and performance of RSS-based secret key extraction in VANETs (2018)
Presentation / Conference Contribution
Bottarelli, M., Epiphaniou, G., Ben Ismail, D. K., Karadimas, P., & Al-Khateeb, H. (2018, June). Quantisation feasibility and performance of RSS-based secret key extraction in VANETs. Presented at 2018 International Conference on Cyber Security and Protection of Digital Services (Cyber Security), Glasgow

Vehicular Ad Hoc Networks (VANETs) has emerged as a unique implementation of Mobile Ad Hoc Networks (MANETs). These networks promise to increase road safety and improve the driving experience by exploiting recent advances in wireless technologies for... Read More about Quantisation feasibility and performance of RSS-based secret key extraction in VANETs.

Error Reconciliation with Turbo Codes for Secret Key Generation in Vehicular Ad Hoc Networks (2018)
Presentation / Conference Contribution
Ben Ismail, D. K., Karadimas, P., Epiphaniou, G., & Al-Khateeb, H. M. (2018, July). Error Reconciliation with Turbo Codes for Secret Key Generation in Vehicular Ad Hoc Networks. Presented at 2018 Computing Conference, London

We present an algorithm that allows two users to establish a symmetric cryptographic key by incorporating the most important features of the wireless channel in vehicle-to-vehicle (V2V) communication. The proposed model includes surrounding scatterer... Read More about Error Reconciliation with Turbo Codes for Secret Key Generation in Vehicular Ad Hoc Networks.

New Intuitive Metrics for Diversity Performance Evaluation of Multi-element Antenna Systems (2015)
Presentation / Conference Contribution
Papamichael, V., & Karadimas, P. (2015, July). New Intuitive Metrics for Diversity Performance Evaluation of Multi-element Antenna Systems. Presented at Progress In Electromagnetics Research Symposium (PIERS 2015), Prague, Czech Republic

Diversity performance of multi-element antenna (MEA) systems is evaluated using several metrics. The most common are the diversity antenna gain (DAG), the effective diversity gain (EDG) and the actual diversity gain (ADG). These metrics calculate the... Read More about New Intuitive Metrics for Diversity Performance Evaluation of Multi-element Antenna Systems.

A Generalized Analysis of Three-Dimensional Anisotropic Scattering in Mobile Wireless Channels-Part II: Second-Order Statistical Characterization (2012)
Presentation / Conference Contribution
Karadimas, P., & Zhang, J. (2012, September). A Generalized Analysis of Three-Dimensional Anisotropic Scattering in Mobile Wireless Channels-Part II: Second-Order Statistical Characterization. Presented at 2012 IEEE Vehicular Technology Conference (VTC Fall), Quebec City, QC, Canada

In a recent paper [1], we presented a generalized theoretical analysis for the diffuse multipath power in mobile wireless channels accounting for three-dimensional (3-D) multi-modal (i.e., clustered) scattering. In this paper, a parameterized case-st... Read More about A Generalized Analysis of Three-Dimensional Anisotropic Scattering in Mobile Wireless Channels-Part II: Second-Order Statistical Characterization.

60 GHz time-domain propagation measurement system (2012)
Presentation / Conference Contribution
Karadimas, P., Allen, B., & Okon, E. (2012, November). 60 GHz time-domain propagation measurement system. Presented at 2012 Loughborough Antennas & Propagation Conference (LAPC), Loughborough, UK

We present a measurement system and method for characterising the 60 GHz time-domain wireless propagation channel using commercially available and cost effective equipment. Our measurements campaign focuses on characterizing shadowing attenuation due... Read More about 60 GHz time-domain propagation measurement system.

Indoor-indoor and indoor-outdoor propagation trial results at 2.6 GHz (2012)
Presentation / Conference Contribution
Fang, C., Allen, B., Liu, E., Karadimas, P., Zhang, J., Glazunov, A. A., & Tufvesson, F. (2012, November). Indoor-indoor and indoor-outdoor propagation trial results at 2.6 GHz. Presented at 2012 Loughborough Antennas & Propagation Conference (LAPC), Loughborough, UK

This paper presents delay spread, coherence bandwidth, and angle-of-arrival statistics derived from an extensive MIMO channel measurement campaign carried out at a central frequency of 2.6GHz. The measurement scenarios include indoor-indoor, indoor-o... Read More about Indoor-indoor and indoor-outdoor propagation trial results at 2.6 GHz.

A Generalized Analysis of Three-Dimensional Anisotropic Scattering in Mobile Wireless Channels-Part I: Theory (2011)
Presentation / Conference Contribution
Karadimas, P., & Zhang, J. (2011, May). A Generalized Analysis of Three-Dimensional Anisotropic Scattering in Mobile Wireless Channels-Part I: Theory. Presented at 2011 IEEE Vehicular Technology Conference (VTC 2011-Spring), Budapest, Hungary

In this paper, we present a generalized theoretical analysis for multipath scattering in mobile wireless channels where scattered power arrives into three dimensions (3-D). Moreover, multipath power can arrive into any arbitrary number of discrete an... Read More about A Generalized Analysis of Three-Dimensional Anisotropic Scattering in Mobile Wireless Channels-Part I: Theory.

Angle of Arrival and Doppler Spectrum in the Presence of Generalized Two-dimensional Anisotropic Scattering (2011)
Presentation / Conference Contribution
Karadimas, P., & Zhang, J. (2011, March). Angle of Arrival and Doppler Spectrum in the Presence of Generalized Two-dimensional Anisotropic Scattering. Presented at PIERS 2011, Marrakesh, Morocco

In this paper, we present a generalized theoretical model for the angle of arrival (AOA) in wireless channels when the scattering is two-dimensional (2-D) anisotropic. This model can constitute a platform for creating new angular distributions for th... Read More about Angle of Arrival and Doppler Spectrum in the Presence of Generalized Two-dimensional Anisotropic Scattering.

Simple Closed-Form Channel Capacity Formulas for the SIMO Nakagami Channel (2008)
Presentation / Conference Contribution
Vagenas, E. D., Karadimas, P., & Kotsopoulos, S. A. (2008, November). Simple Closed-Form Channel Capacity Formulas for the SIMO Nakagami Channel. Presented at 2008 IEEE Globecom Workshops, New Orleans, Louisiana, USA

This paper presents simple closed-form expressions for the ergodic channel capacity of SIMO (single-input and multiple output) wireless systems operating in a Nakagami fading channel. As the performance of SIMO channel is closely related to the diver... Read More about Simple Closed-Form Channel Capacity Formulas for the SIMO Nakagami Channel.

A Small Scale Fading Model with Sectored and Three Dimensional Diffuse Scattering (2008)
Presentation / Conference Contribution
Karadimas, P., Vagenas, E. D., & Kotsopoulos, S. A. (2008, January). A Small Scale Fading Model with Sectored and Three Dimensional Diffuse Scattering. Presented at 2008 5th IEEE Consumer Communications and Networking Conference, Las Vegas, Nevada, USA

In frequency non-selective fading channels the multipath components can arrive at the mobile receiver via a three dimensional (3-D) scattering mechanism. That case occurs especially in urban environments, in which the tall buildings and other obstacl... Read More about A Small Scale Fading Model with Sectored and Three Dimensional Diffuse Scattering.