- Optical wireless Communications, Free Space Optics, Optical Fibre Communications, Optical switching, Communication Networks, Optical Fiber Communications, and 21 moreFREE SPACE OPTICAL COMMUNICATION, Fibre Optic Communications, Video Transmission, Indoor Optical Wireless Communications, Optical Communications, Optcal Wireless Communications, Modulation techniques, All optical Networks, Ciecuit Design, Multiplexing, Photonics, Packet Switching, Modulation Schemes, Optical Amplifiers and Switches, Optical Quantum Devices, Optical Modulators, Tunable Lasers and Detectors, Multilevel Inverters: A Comparative Study of Pulse Width Modulation Techniques, Optical Switch, Visible Light Communication, and Optical Communicationedit
- Biography: Prof Ghassemlooy received BSc (Hons.) in electrical and electronics eng. from Manchester Metropolitan Univ... moreBiography: Prof Ghassemlooy received BSc (Hons.) in electrical and electronics eng. from Manchester Metropolitan Univ., UK in 1981, and MSc (1984) and PhD (1987) from Univ. of Manchester, UK. 1987-88 was a Post-Doctoral Research Fellow, City Univ., UK. 1988 joined Sheffield Hallam Univ. as a Lecturer, becoming a Professor in 1997. 2004 joined Univ. of Northumbria, Newcastle as an Associate Dean (AD) for research in School of Eng., and from 2012 to 2014 was AD for Research and Innovation, Faculty of Eng., where he currently is Head of the Optical Communications Research Group. 2001 awarded Tan Chin Tuan Fellowship in Eng. from Nanyang Technological Univ., Singapore. 2016 a Research Fellow and in 2015 a Distinguished Professor at Chines Academy of Science, Quanzhou, China. He is a Visiting Professor at the Univ. Tun Hussein Onn Malaysia (2013-17), and Huaqiao Univ., China (2017-18). Published over 700 papers (300 journals and 6 books), over 91 keynote/invited talks, and supervised over 60 PhDs. Research interests include optical wireless communications, free space optics, and visible light communications. He was the Vice-Chair of EU Cost Action IC1101 (2011-16). He is the Chief Editor of the British Journal of Applied Science and Technology and the International Journal of Optics and Applications. He is the fellow of the IET, a senior member of IEEE, a member of OSA, and Charted Engineer. He is a co-author of a CRC book on “Optical Wireless Communications – Systems and Channel Modelling with Matlab (2012)edit
Research Interests:
Research Interests:
Abstract This paper investigates the bit error rate (BER) performance of a radio-over-fibre system utilizing binary phase shift keying (BPSK) at radio frequency (RF) of 5 GHz. The RF signal is externally modulated using the Mach-Zehnder... more
Abstract This paper investigates the bit error rate (BER) performance of a radio-over-fibre system utilizing binary phase shift keying (BPSK) at radio frequency (RF) of 5 GHz. The RF signal is externally modulated using the Mach-Zehnder modulator (MZM). The results have been ...
Research Interests:
Research Interests:
Transmit laser selection (TLS) diversity scheme has been proposed recently for free-space optical communication systems and its bit error rate (BER) performance has been investigated over K-distributed turbulence channels based on lengthy... more
Transmit laser selection (TLS) diversity scheme has been proposed recently for free-space optical communication systems and its bit error rate (BER) performance has been investigated over K-distributed turbulence channels based on lengthy simulations. Moreover, for a limiting case of strong turbulence conditions that have been modelled by negative exponential distribution, a closed-form expression for the average BER has been presented in the open technical literature. In this study, first a novel approximate analytical expression is derived for the probability density function (PDF) of the resulting channel irradiance corresponding to a TLS diversity scheme over the K channel. The approximated PDF accurately estimates the statistics of the channel irradiance over a wide range of channel conditions. Then, based on the derived PDF, an analytical closed-form expression is presented for the average BER, which can be used to estimates the BER of the system very accurately over K-distributed turbulence channels without resorting to lengthy simulations. Additionally, based on the derived analytical results, the effect of using laser pulse shape with increased peak-to-average optical power ratio on the system performance is investigated. Numerical results are further demonstrated to confirm the analytical results.
Research Interests: Mathematics, Computer Science, Turbulence, Probability, Free Space Optics, and 10 moreFREE SPACE OPTICAL COMMUNICATION, Numerical Simulation, Diversity Combining, Bit Error Rate, Optical telecommunication, Irradiance, Exponential distribution, Probability Density Function, Electrical And Electronic Engineering, and IET Communications
The cursive and ligature nature of the Arabic script make the segmentation of words into individual characters a difficult task. Despite attempts to apply methods for cursive Latin and other scripts to Arabic script, it is generally... more
The cursive and ligature nature of the Arabic script make the segmentation of words into individual characters a difficult task. Despite attempts to apply methods for cursive Latin and other scripts to Arabic script, it is generally insufficient to segment the Arabic text. This paper proposes a new segmentation algorithm for the handwritten Arabic text and the main idea consists
Research Interests:
Research Interests:
Research Interests:
The wireless information carrier shift from the radio frequencies to optical frequencies has been studied in increasing detail since the invention of the laser in the 1960s [...]
Research Interests:
Research Interests: Computer Science, Physics, Optics, Modulation, Free Space Optics, and 13 moreFREE SPACE OPTICAL COMMUNICATION, IEEE, Atmospheric Turbulence, Bit Error Rate, Polarisation, Communication Channels, MRC, Maximum Ratio Combining, Digital signal, Signal to Noise Ratio, H, Spatial Diversity, and Amplitude shift keying
Research Interests:
Research Interests:
Research Interests:
Research Interests: Mechanical Engineering, Computer Science, Optics, Optical wireless Communications, FREE SPACE OPTICAL COMMUNICATION, and 10 moreOptical Communications, Visible Light Communication, Bit Error Rate, Applied Optics, Optical physics, Headlamp, H, Electrical And Electronic Engineering, Communications System, and Visible spectrum
Research Interests:
Research Interests: Engineering, Electronic Engineering, Computer Science, Optical Communication, Communication System, and 11 moreWireless, IEEE, Communication Channels, Infrared, Environmental Conditions, H, Optical Wireless, Inter Symbol Interference, power efficiency, pulse position modulation (PPM), and Line of sight
Research Interests:
Abstract The paper presents the concept, design and analysis for a visible light communications receiver which has a full 180 perception angle thus offering the guard against blocking and enhancing the system mobility. The proposed... more
Abstract The paper presents the concept, design and analysis for a visible light communications receiver which has a full 180 perception angle thus offering the guard against blocking and enhancing the system mobility. The proposed receiver includes seven sub-receivers with the proposed geometrical shape investigated and analyzed in MATLAB® for evaluating the received power, RMS delay spread and corresponding signal to noise ratio. The results show that the receiver is fully mobile within the test area and can handle ...
Research Interests:
Research Interests:
Abstract This paper presents the development of a Visible Light Communications (VLC) system for a local area network (LAN). The link is analyzed for all development stages and compared with a typical Ethernet system. The VLC system uses a... more
Abstract This paper presents the development of a Visible Light Communications (VLC) system for a local area network (LAN). The link is analyzed for all development stages and compared with a typical Ethernet system. The VLC system uses a Philips Luxeon Rebel as ...
Research Interests: Engineering, Telecommunications, Computer Networks, Communication System, Computer Network, and 13 moreVisible Light Communication, IEEE, Ethernet, IP networks, Visible Light, Metro Ethernet Networks (MEN), Local Area Network, Visible Light Communications, Transmitter, H, Communications, Optical Wireless, and Light Emitting Diode
This paper reports the experimental wavelet denoising techniques carried out for the first time for a number of modulation schemes for indoor optical wireless communications in the presence of fluorescent light interference. The... more
This paper reports the experimental wavelet denoising techniques carried out for the first time for a number of modulation schemes for indoor optical wireless communications in the presence of fluorescent light interference. The experimental results are verified using computer simulations, clearly illustrating the advantage of the wavelet denoising technique in comparison to the high pass filtering for all baseband modulation schemes.
Research Interests:
Research Interests:
This letter presents new experimental results on a 1-Mb/s organic visible light communications system. These results are the first demonstration of a fully organic free space optical communications system. Due to low charge transport... more
This letter presents new experimental results on a 1-Mb/s organic visible light communications system. These results are the first demonstration of a fully organic free space optical communications system. Due to low charge transport characteristics, organic devices are typically highly band limited in the hundreds of kilohertz region (up to 135 kHz in this letter). Therefore, an artificial neural network (ANN) equalizer is required to undo the effects of intersymbol interference. Without the ANN, the maximum link performance corresponds to a data rate of 350 kb/s; however, with the ANN, a transmission speed of 1.15 Mb/s could be supported.
Research Interests: Engineering, Computer Science, Optical Communication, Organic light emitting diodes, Optical wireless Communications, and 10 moreArtificial Neural Networks, Photodetectors, Visible Light Communication, Q factor, Bit Error Rate, Optical physics, Visible Light Communications, Bandwidth, H, and Electrical And Electronic Engineering
Research Interests:
There is a growing demand for high mobility and ultrafast internet/data services which drives the motivation for free space optical (FSO) communications for high speed trains. Here we present an FSO link for the ground-to-train... more
There is a growing demand for high mobility and ultrafast internet/data services which drives the motivation for free space optical (FSO) communications for high speed trains. Here we present an FSO link for the ground-to-train communications, which consists of optical transceivers positioned alongside the track and on the roof of the train. When the train moves at a high speed, the airwave induced turbulence degrades the FSO link performance. In this paper the effect of turbulence is experimentally investigated and ...
Research Interests:
Abstract: In this paper we evaluate the performance of digital pulse interval modulation (DPIM) with convolutional coding for different values of bit resolution and different sizes of guard bands. We show that convolutional coding is an... more
Abstract: In this paper we evaluate the performance of digital pulse interval modulation (DPIM) with convolutional coding for different values of bit resolution and different sizes of guard bands. We show that convolutional coding is an effective method of improving the error performance of DPIM over optical wireless links. The convolutional coded DPIM with a guard band of 2 slots has the advantage of fixed header pattern so that decoding is simple with no need for Viterbi decoding. It also achieves a code gain of more than 4 dB ...
Research Interests:
Abstract There is a huge demand for seamless high-speed communications in fast moving trains. People want broadband services while on board as in their home or in the workplace. This demand drives the motivation for a high speed... more
Abstract There is a huge demand for seamless high-speed communications in fast moving trains. People want broadband services while on board as in their home or in the workplace. This demand drives the motivation for a high speed dedicated optical wireless link. Here ...
Research Interests:
Research Interests: Electronic Engineering, Telecommunications Engineering, Computer Science, Physics, Electronics, and 9 moreOptical wireless Communications, Equalization, Visible Light Communication, Bit Error Rate, Optical physics, Artifical Neural Network(ANN), Visible Light Communications, Artificial Neural Network, and Electrical And Electronic Engineering
Research Interests:
Research Interests:
Research Interests:
Research Interests: Engineering, Computer Science, Computer Network, Local Area Networks, Visibility, and 3 moreEthernet, H, and G
Research Interests: Engineering, Computer Science, Artificial Intelligence, Optical Communication, Wavelet, and 12 moreOptical wireless Communications, Wavelet Transform, Noise reduction, Wireless, IEEE, Discrete wavelet transform, High Pass Filters, H, Discrete Wavelet Transforms, Optical Wireless, Light Interference, and pulse position modulation (PPM)
Visible Light Communication (VLC) uses light-emitting diodes to provide wireless connectivity in public environments. Transmission security in this emerging channel is not trivial. Chaotic modulation techniques can provide encryption... more
Visible Light Communication (VLC) uses light-emitting diodes to provide wireless connectivity in public environments. Transmission security in this emerging channel is not trivial. Chaotic modulation techniques can provide encryption directly in the physical layer based on the random-alike evolution and strong synchronization prospect given by deterministic chaos. In secure chaotic inclusion or embedding methods, continuous-time chaos oscillator models need to be synchronized via a coupling carrier. Here we present a first numerical simulation study for the impact of the variable delays induced by line-of-sight and non-line-of-sight multipath fading in complete chaotic synchronization. More precisely, we analyze a chaotic Colpitts oscillator that is simultaneously transmitting the carrier to several mobile receivers via nine spotlights. Such induced delays depend on both the receiver position and the carrier frequency, influencing the complete synchronization required in modulation ...
Research Interests:
Research Interests: Engineering, Electronic Engineering, Computer Science, Optical Communication, Visible Light Communication, and 12 moreBit Error Rate, Symbol error rate, Light Emitting Diodes, Visible Light, System performance, Optical Filters, Visible Light Communications, Bandwidth, H, Equalizer, Adaptive Equalizer, and Feed Forward
Research Interests: Engineering, Computer Science, Nonlinear Optics, Parallel Processing, Artificial Neural Networks, and 15 moreOptical computing, Bit Error Rate, Error Correction, Discrete wavelet transform, FIR filters, Optical Filters, Detector, Pulse Modulation, H, Discrete Wavelet Transforms, Artificial Neural Network, Equalizer, Channel Equalization, Neural nets, and Adaptive Equalizer
Abstract In this paper, the effect of the equal gain combining (EGC) spatial diversity for the free space optical (FSO) link for the new hybrid pulse position modulation binary phase shift keying subcarrier intensity modulation... more
Abstract In this paper, the effect of the equal gain combining (EGC) spatial diversity for the free space optical (FSO) link for the new hybrid pulse position modulation binary phase shift keying subcarrier intensity modulation (2-PPM-BPSK-SIM) scheme in a turbulence channel is investigated. The analytical unconditional bit error rate (BER) of 2-PPM-BPSK-SIM with the EGC diversity under lognormal and negative exponential channels is investigated and a computer simulation is carried out to quantify the diversity gain. The results are compared ...
Research Interests:
Research Interests: Computer Science, Distributed Computing, Fluorescence, Data Communications, Optical Communication, and 15 moreModulation, OFDM, Data Communication, Lighting, Bit Error Rate, Links, Light Emitting Diodes, GNSS receivers, Bandwidth, Electromagnetic Spectrum, Electrical And Electronic Engineering, Amplitude Modulation, Amplitude, Modulation formats, and OFDM modulation
Research Interests:
Research Interests:
Research Interests:
Research Interests: Computer Science, Training, Polymers, Organic light emitting diodes, Artificial Neural Networks, and 15 moreVisible Light Communication, Bit Error Rate, Neurons, Multilayer Perceptron, Optical physics, Forward Error Correction, Optical Links, Equalizers, Bandwidth, Polymer Light Emitting Diodes, Artificial Neural Network, Electrical And Electronic Engineering, error statistics, Neural nets, and Phase shift keying
We present a newly designed polymer light-emitting diode with a bandwidth of ~350 kHz for high-speed visible light communications. Using this new polymer light-emitting diode as a transmitter, we have achieved a record transmission speed... more
We present a newly designed polymer light-emitting diode with a bandwidth of ~350 kHz for high-speed visible light communications. Using this new polymer light-emitting diode as a transmitter, we have achieved a record transmission speed of 10 Mb/s for a polymer light-emitting diode-based optical communication system with an orthogonal frequency division multiplexing technique, matching the performance of single carrier formats using multitap equalization. For achieving such a high data-rate, a power pre-emphasis technique was adopted.