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Browsing by Author "Optical Networks"
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0.6 Tb/s-km multimode fibre feasibility - Experimant using 40 channel DWDM over Quadrature-Subcarrier channels
Kourtessis, P.; Quinlan, T.; Rochat, E.; Walker, S.D.; White, I.H.; Penty, R.V.; Parker, M.C. (2002-07) -
Advanced PON topologies with wireless connectivity
Milosavljevic, M.; Kourtessis, P.; Gliwan, A.; Senior, J.M. (Institute of Electrical and Electronics Engineers (IEEE), 2009)The interoperability of wireless and PON networking solutions is investigated to reduce deployment expenditure by means of centralised network management while providing ubiquitous access connections and mobility. Network ... -
Analysis of RF power optimisation for SCM-based free space optical systems for IM3
Lim, W.; Ghassemlooy, Z.; Kim, K. (2011-09-15)The focus of this reported research is on the optimisation of input RF power in SCM-based free space optical (FSO) systems to minimise the average BER because higher input RF power does not always provide FSO systems with ... -
Analytical time-domain model for radio over free space optical (RoFSO) systems considering the scintillation effect
Lim, Wansu; Cho, Tae-Sik; Yun, Changho; Kourtessis, Pandelis; Kim, Kiseon; Yang, Yeon-Mo (2012)An analytical time-domain model is presented to analyze a radio over free space optical (RoFSO) system considering the scintillation effect with a log-normal distribution. This analytical model uses a dual-drive Mach-Zehnder ... -
Anatomy of Deep Learning Image Classification and Object Detection on Commercial Edge Devices: A Case Study on Face Mask Detection
Kolosov, Dimitrios; Kelefouras, Vasilios; Kourtessis, Pandelis; Mporas, Iosif (2022-10-13)Developing efficient on-the-edge Deep Learning (DL) applications is a challenging and non-trivial task, as first different DL models need to be explored with different trade-offs between accuracy and complexity, second, ... -
Channel estimation for wireless communications using space-time block coding techniques
Yang, J.; Sun, Y.; Senior, J.M.; Pem, N. (Institute of Electrical and Electronics Engineers (IEEE), 2003)This paper presents a method of estimating channel parameters in wireless communications using space-time block coding (STBC). After reviewing the concept of STBC, the system model of radio communication with STBC is ... -
Chirp control of an electroabsorption modulator to be used for regeneration and wavelength conversion at 40 gbit/s in all-optical networking
Jamro, M.Y.; Senior, J.M. (2005)Chirp control to produce low or negative values of chirp at the output of an electroabsorption modulator ( EAM) is an important mechanism for reducing the signal degradation due to chromatic dispersion in high- speed ... -
Chirp in a wavelength converter based on a symmetrical-MZI employing SOAs
Jamro, M.Y.; Senior, J.M.; Leeson, M.S.; Murtaza, G. (2002-08-15)A wavelength converter based on cross-phase modulation using semiconductor optical amplifiers (SOAs) in a symmetrical MZI is modelled. Since the model of the SOAs considers both amplitude and wavelength-dependent parameters ... -
Colorless FDMA-PON with flexible bandwidth allocation and colorless, low-speed ONUs [invited]
Schindler, P. C.; Schmogrow, R.; Dreschmann, M.; Meyer, J.; Tomkos, Ioannis; Prat, J.; Krimmel, H-G.; Pfeiffer, T.; Kourtessis, Pandelis; Ludwig, A.; Karnick, D.; Hillerkuss, D.; Becker, J.; Koos, C.; Freude, W.; Leuthold, J. (2013-10)We demonstrate a remotely seeded flexible passive optical network (PON) with multiple low-speed subscribers but only a single optical line terminal transceiver operating at a data rate of 31.25 Gbits/s. The scheme is based ... -
A complete 5 Gb/s throughput quadrature sub carrier system featuring zero-latency carrier and data synchronization
Kourtessis, P.; Dudley, S.; Quinlan, T.; Walker, S.D.; Tyler, E.J.; Penty, R.V.; White, I.H. (2002) -
A complete 8-GHz QPSK-MODEM featuring novel subcarrier and data synchronization for optical communications
Kourtessis, P.; Walker, S.D. (2007) -
Contactless Camera-Based Heart Rate and Respiratory Rate Monitoring Using AI on Hardware
Kolosov, Dimitrios; Kelefouras, Vasilios; Kourtessis, Pandelis; Mporas, Iosif (2023-05-07)Detecting vital signs by using a contactless camera-based approach can provide several advantages over traditional clinical methods, such as lower financial costs, reduced visit times, increased comfort, and enhanced safety ... -
Cooperative 5G Switched and adaptive receiver beamforming for fibre wireless networks
Pitakandage, T.; Milosavljevic, Milos; Kourtessis, Pandelis; Senior, John (Institute of Electrical and Electronics Engineers (IEEE), 2014)This paper introduces an eNodeB receiver beamforming technique to mitigate future 5G network uplink inter-cell interference. This technique is based on the concept of smart antennas, improving the uplink signal-to-interference ... -
Cooperative cyclic sleep and doze mode selection for NG-PONs
Nauka, D.; Fernando, V.; Milosavljevic, Milos; Kourtessis, Pandelis; Senior, J.M. (Institute of Electrical and Electronics Engineers (IEEE), 2014)This paper presents an energy efficient medium access control (MAC) protocol exhibiting intelligent switching among optical network unit (ONU) transceiver power levels. This is implemented by introducing a new methodology ... -
Cooperative uplink Inter-cell interference (ICI) mitigation in 5G Fibre Wireless (FiWi) Networks
Pitakandage, T.; Milosavljevic, Milos; Kourtessis, Pandelis; Senior, J.M. (Institute of Electrical and Electronics Engineers (IEEE), 2015)This paper presents a novel cooperative uplink inter-cell interference (ICI) mitigation algorithm based on joint reception at the base station using receiver adaptive beamforming in a Cloud Radio Access Network (CRAN). In ... -
Coverage Probability of Cell-Free Massive MIMO Systems
Papazafeiropoulos, A. K.; Kourtessis, P.; Renzo, M. DI; Chatzinotas, S.; Senior, J. M. (Institute of Electrical and Electronics Engineers (IEEE), 2020-12-04)Despite that ongoing and future networks become denser and increasingly irregular, prior works in the area of cell-free (CF) massive multiple-input-multiple-output (mMIMO) systems relied on the strong assumption of uniformly ... -
Coverage Probability of STAR-RIS assisted Massive MIMO systems with Correlation and Phase Errors
Papazafeiropoulos, Anastasios; Abdullah, Zaid; Kourtessis, Pandelis; Kisseleff, Steven; Krikidis, Ioannis (2022-06-01)In this letter, we investigate a simultaneous transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) assisting a massive multiple-input multiple-output (mMIMO) system. In particular, we derive a closed-form ... -
Deep Channel Learning For Large Intelligent Surfaces Aided mm-Wave Massive MIMO Systems
Elbir, Ahmet M.; Papazafeiropoulos, Anastasios; Kourtessis, Pandelis; Chatzinotas, Symeon; Senior, John (2020-09)This letter presents the first work introducing a deep learning (DL) framework for channel estimation in large intelligent surface (LIS) assisted massive MIMO (multiple-input multiple-output) systems. A twin convolutional ... -
Demonstration of Coarse-Fine Grooming in Coarse-WDM-Routed PONs
Shachaf, Y.; Polo, V.; Kourtessis, P.; Prat, J.; Senior, J.M. (2009)A scalable access network architecture is implemented experimentally to demonstrate gradual deployment of time- and wavelength-division-multiplexed passive optical networks (PONs) in a single-platform with minor changes ... -
Demonstration of wireless backhauling over long-reach PONs
Milosavljevic, Milos; Thakur, M.P.; Kourtessis, Pandelis; Mitchell, J.E.; Senior, J.M. (2012)An IEEE 802.16e-2005 (WiMAX) compliant, longreach passive optical network is demonstrated, focusing on the development of next generation optical access with transparent wireless backhauling. In addition to the extended ...