Dr Petros Karadimas' Outputs (17)

Spatial Channel Degrees of Freedom for Optimum Antenna Arrays (2023)
Journal Article
Huang, Y., Karadimas, P., & Sohrab, A. P. (2023). Spatial Channel Degrees of Freedom for Optimum Antenna Arrays. IEEE Transactions on Wireless Communications, 22(8), 5129-5144. https://doi.org/10.1109/TWC.2022.3231732

One of the ultimate goals of future wireless networks is to maximize data rates to accommodate bandwidth-hungry services and applications. Thus, extracting the maximum amount of information bits for given spatial constraints when designing wireless s... Read More about Spatial Channel Degrees of Freedom for Optimum Antenna Arrays.

Adaptive and Optimum Secret Key Establishment for Secure Vehicular Communications (2021)
Journal Article
Bottarelli, M., Karadimas, P., Epiphaniou, G., Ismail, D. K. B., & Maple, C. (2021). Adaptive and Optimum Secret Key Establishment for Secure Vehicular Communications. IEEE Transactions on Vehicular Technology, 70(3), 2310-2321. https://doi.org/10.1109/tvt.2021.3056638

In intelligent transportation systems (ITS), communications between vehicles, i.e. vehicle-to-vehicle (V2V) communications are of greatest importance to facilitate autonomous driving. The current state-of-the-art for secure data exchange in V2V commu... Read More about Adaptive and Optimum Secret Key Establishment for Secure Vehicular Communications.

On the Covariance Matrix and Diversity Performance Evaluation of Compact Multiport Antenna Systems (2017)
Journal Article
Papamichael, V., & Karadimas, P. (2017). On the Covariance Matrix and Diversity Performance Evaluation of Compact Multiport Antenna Systems. IEEE Transactions on Antennas and Propagation, 65(11), 6140-6144. https://doi.org/10.1109/tap.2017.2754439

In this communication, we present a new electromagnetic methodology that determines the covariance matrix of compact multiport antenna (MPA) systems at the early design stage. Further insight into this field is provided, as contrary to existing metho... Read More about On the Covariance Matrix and Diversity Performance Evaluation of Compact Multiport Antenna Systems.

Human Body Shadowing Characterization for 60-GHz Indoor Short-Range Wireless Links (2013)
Journal Article
Karadimas, P., Allen, B., & Smith, P. (2013). Human Body Shadowing Characterization for 60-GHz Indoor Short-Range Wireless Links. IEEE Antennas and Wireless Propagation Letters, 12, 1650-1653. https://doi.org/10.1109/lawp.2013.2294563

We statistically characterize received signal power variations in the time domain caused by human activity affecting 60-GHz indoor short-range wireless links. Our approach is based on propagation measurements in indoor environments considering human... Read More about Human Body Shadowing Characterization for 60-GHz Indoor Short-Range Wireless Links.

On the Scatterers' Mobility and Second Order Statistics of Narrowband Fixed Outdoor Wireless Channels (2010)
Journal Article
Karadimas, P., Vagenas, E. D., & Kotsopoulos, S. A. (2010). On the Scatterers' Mobility and Second Order Statistics of Narrowband Fixed Outdoor Wireless Channels. IEEE Transactions on Wireless Communications, 9(7), 2119-2124. https://doi.org/10.1109/twc.2010.07.080874

In this paper, we study the temporal behavior of narrowband fixed outdoor wireless channels by modeling the impact of scatterers' mobility on the second order statistics of such channels. We show that the Nakagami-m, gamma, Weibull and lognormal prob... Read More about On the Scatterers' Mobility and Second Order Statistics of Narrowband Fixed Outdoor Wireless Channels.

Performance Analysis of Multiport Antennas in Vehicle-to-Vehicle Communication Channels (2024)
Journal Article
Pour Sohrab, A., Huang, Y., & Karadimas, P. (2024). Performance Analysis of Multiport Antennas in Vehicle-to-Vehicle Communication Channels. Wireless Personal Communications, 134, 1231–1257. https://doi.org/10.1007/s11277-024-10875-0

A holistic performance analysis and classification of multiport antennas (MPAs) is conducted in this paper. We focus on 5.9 GHz vehicle-to-vehicle communications suited to the emerging technology of intelligent transportation systems. Three-dimension... Read More about Performance Analysis of Multiport Antennas in Vehicle-to-Vehicle Communication Channels.

An Efficient Cross-Layer Authentication Scheme for Secure Communication in Vehicular Ad-hoc Networks (2023)
Journal Article
Shawky, M. A., Bottarelli, M., Epiphaniou, G., & Karadimas, P. (2023). An Efficient Cross-Layer Authentication Scheme for Secure Communication in Vehicular Ad-hoc Networks. IEEE Transactions on Vehicular Technology, 72(7), 8738 - 8754. https://doi.org/10.1109/TVT.2023.3244077

Intelligent transportation systems contribute to improved traffic safety by facilitating real-time communication between vehicles and infrastructures. In this context, message authentication is crucial to safeguard vehicular ad-hoc networks (VANETs)... Read More about An Efficient Cross-Layer Authentication Scheme for Secure Communication in Vehicular Ad-hoc Networks.

Physical characteristics of wireless communication channels for secret key establishment: A survey of the research (2018)
Journal Article
Bottarelli, M., Epiphaniou, G., Ismail, D. K. B., Karadimas, P., & Al-Khateeb, H. (2018). Physical characteristics of wireless communication channels for secret key establishment: A survey of the research. Computers and Security, 78, 454-476. https://doi.org/10.1016/j.cose.2018.08.001

Physical layer security protocols have recently been deployed in the context of Wireless communications. These are derived from the intrinsic characteristics of the communication media for key generation, sharing and randomness extraction. These prot... Read More about Physical characteristics of wireless communication channels for secret key establishment: A survey of the research.

Proactive Threat Detection for Connected Cars Using Recursive Bayesian Estimation (2017)
Journal Article
al-Khateeb, H., Epiphaniou, G., Reviczky, A., Karadimas, P., & Heidari, H. (2018). Proactive Threat Detection for Connected Cars Using Recursive Bayesian Estimation. IEEE Sensors Journal, 18(12), 4822-4831. https://doi.org/10.1109/jsen.2017.2782751

Upcoming disruptive technologies around autonomous driving of connected cars have not yet been matched with appropriate security by design principles and lack approaches to incorporate proactive preventative measures in the wake of increased cyber-th... Read More about Proactive Threat Detection for Connected Cars Using Recursive Bayesian Estimation.

Nonreciprocity Compensation Combined With Turbo Codes for Secret Key Generation in Vehicular Ad Hoc Social IoT Networks (2017)
Journal Article
Epiphaniou, G., Karadimas, P., Kbaier Ben Ismail, D., Al-Khateeb, H., Dehghantanha, A., & Choo, K.-K. R. (2018). Nonreciprocity Compensation Combined With Turbo Codes for Secret Key Generation in Vehicular Ad Hoc Social IoT Networks. IEEE Internet of Things, 5(4), 2496-2505. https://doi.org/10.1109/jiot.2017.2764384

The physical attributes of the dynamic vehicle-to-vehicle propagation channel can be utilized for the generation of highly random and symmetric cryptographic keys. However, in a physical-layer key agreement scheme, nonreciprocity due to inherent chan... Read More about Nonreciprocity Compensation Combined With Turbo Codes for Secret Key Generation in Vehicular Ad Hoc Social IoT Networks.

Energy Detection Based Spectrum Sensing Over Two-Wave With Diffuse Power Fading Channels (2016)
Journal Article
Chatziantoniou, E., Allen, B., Velisavljevic, V., Karadimas, P., & Coon, J. (2016). Energy Detection Based Spectrum Sensing Over Two-Wave With Diffuse Power Fading Channels. IEEE Transactions on Vehicular Technology, 66(1), 868-874. https://doi.org/10.1109/tvt.2016.2556084

One of the most important factors that affects the performance of energy detection (ED) is the fading channel between the wireless nodes. This paper investigates the performance of ED-based spectrum sensing, for cognitive radio (CR), over two-wave wi... Read More about Energy Detection Based Spectrum Sensing Over Two-Wave With Diffuse Power Fading Channels.

Generic stochastic modeling of vehicle-to-vehicle wireless channels (2014)
Journal Article
Karadimas, P., & Matolak, D. (2014). Generic stochastic modeling of vehicle-to-vehicle wireless channels. Vehicular Communications, 1(4), 153-167. https://doi.org/10.1016/j.vehcom.2014.08.001

We present a generic statistical characterization of the vehicle-to-vehicle (V–V) wireless channel by adopting a stochastic modeling approach. Our approach is based on the doubly underspread (DU) property of non-wide sense stationary uncorrelated sca... Read More about Generic stochastic modeling of vehicle-to-vehicle wireless channels.

Performance Evaluation of Actual Multielement Antenna Systems Under Transmit Antenna Selection/Maximal Ratio Combining (2011)
Journal Article
Papamichael, V. C., & Karadimas, P. (2011). Performance Evaluation of Actual Multielement Antenna Systems Under Transmit Antenna Selection/Maximal Ratio Combining. IEEE Antennas and Wireless Propagation Letters, 10, 690-692. https://doi.org/10.1109/lawp.2011.2161662

In this letter, the performance of actual multielement antenna (MEA) systems under the transmit antenna selection/maximal ratio combining (TAS/MRC) technique is evaluated. An alternative version of an efficient, recently developed, stochastic electro... Read More about Performance Evaluation of Actual Multielement Antenna Systems Under Transmit Antenna Selection/Maximal Ratio Combining.

Ergodic Capacity for the SIMO Nakagami- Channel (2009)
Journal Article
Vagenas, E. D., Karadimas, P., & Kotsopoulos, S. A. (2009). Ergodic Capacity for the SIMO Nakagami- Channel. EURASIP Journal on Wireless Communications and Networking, 2009(1), Article 802067. https://doi.org/10.1155/2009/802067

This paper presents 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 diversity c... Read More about Ergodic Capacity for the SIMO Nakagami- Channel.

A Modified Loo Model with Partially Blocked and Three Dimensional Multipath Scattering: Analysis, Simulation and Validation (2009)
Journal Article
Karadimas, P., & Kotsopoulos, S. A. (2010). A Modified Loo Model with Partially Blocked and Three Dimensional Multipath Scattering: Analysis, Simulation and Validation. Wireless Personal Communications, 53(4), 503-528. https://doi.org/10.1007/s11277-009-9698-z

This paper presents a novel mobile fading channel model, belonging to the class of Loo models, in which the multipath power arrives both in three dimensions (3-D) and in two angular sectors at the azimuth receiver’s plane. Moreover shadowing affects... Read More about A Modified Loo Model with Partially Blocked and Three Dimensional Multipath Scattering: Analysis, Simulation and Validation.

The Weibull–Lognormal Fading Channel: Analysis, Simulation, and Validation (2008)
Journal Article
Karadimas, P., & Kotsopoulos, S. (2009). The Weibull–Lognormal Fading Channel: Analysis, Simulation, and Validation. IEEE Transactions on Vehicular Technology, 58(7), 3808-3813. https://doi.org/10.1109/tvt.2008.2002697

In frequency-nonselective fading channels, the partial waves arriving at the mobile receiver cannot explicitly be of homogeneous nature due to nonuniform scattering caused by objects of specific reflective nature. Moreover, shadowing influences the r... Read More about The Weibull–Lognormal Fading Channel: Analysis, Simulation, and Validation.

A Generalized Modified Suzuki Model with Sectored and Inhomogeneous Diffuse Scattering Component (2008)
Journal Article
Karadimas, P., & Kotsopoulos, S. A. (2008). A Generalized Modified Suzuki Model with Sectored and Inhomogeneous Diffuse Scattering Component. Wireless Personal Communications, 47(4), 449-469. https://doi.org/10.1007/s11277-008-9493-2

This paper presents a mixture stochastic process by multiplying a Weibull process with a lognormal one. The first one models the possible scattering non-uniformities of the channel, whereas the second accounts for the slow term variations of the loca... Read More about A Generalized Modified Suzuki Model with Sectored and Inhomogeneous Diffuse Scattering Component.