Izzat Darwazeh
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View article: Clock and Carrier Synchronized Multi-Band Wireless Communications Enabled by Frequency Comb Dissemination in Radio Access Networks
Clock and Carrier Synchronized Multi-Band Wireless Communications Enabled by Frequency Comb Dissemination in Radio Access Networks Open
Next-generation radio access network (RAN) requires wireless communication in multiple frequency bands between distributed unit (DU) and the radio unit (RU) for optimum spectrum usage and increasing data capacity. Besides, accuracy positio…
View article: Dual band wireless transmission over 75-150GHz millimeter wave carriers using frequency-locked laser pairs
Dual band wireless transmission over 75-150GHz millimeter wave carriers using frequency-locked laser pairs Open
We generate and transmit 75-GHz-bandwidth OFDM signals over the air using three mutually frequency-locked lasers, achieving minimal frequency gap between the wireless W and D bands using optical-assisted approaches, resulting in 173.5 Gb/s…
View article: New Insights on Application of Return Loss Measurement for Starch Content Estimation in Cassava
New Insights on Application of Return Loss Measurement for Starch Content Estimation in Cassava Open
<p>This research explores the use of radio frequency (RF) return loss measurement to characterize cassava quality and estimate the starch content of cassava roots, with new equivalent circuit models presented. While pure starch is no…
View article: Cassava Starch Measurement in the Field - Evolution of a Low Cost Test Instrument with Wireless Connectivity
Cassava Starch Measurement in the Field - Evolution of a Low Cost Test Instrument with Wireless Connectivity Open
<p>The evolution in design philosophy for a portable test instrument for estimating the starch content of cassava roots is described. The instrument uses a radio frequency reflectometry technique to measure return loss using a coaxia…
View article: Non‐linear modelling and distortion compensation in optical Fast‐orthogonal frequency division multiplexing systems
Non‐linear modelling and distortion compensation in optical Fast‐orthogonal frequency division multiplexing systems Open
Fast‐OFDM‐based intensity‐modulation and direct‐detection (IM/DD) has been proposed for deployment of cost‐efficient optical access networks, due to its implementation simplicity and high spectral efficiency. In this article, the accuracy …
View article: Estimation of starch content in cassava based on coefficient of reflection measurement
Estimation of starch content in cassava based on coefficient of reflection measurement Open
This technology report validates the application of radio frequency (RF) coefficient of reflection (Γ) measurement as a viable and accurate means to estimate the starch content of fresh cassava roots. A clear relationship between cassava d…
View article: Index Modulation Pattern Design for Non-Orthogonal Multicarrier Signal Waveforms
Index Modulation Pattern Design for Non-Orthogonal Multicarrier Signal Waveforms Open
Spectral efficiency improvement is a key focus in most wireless communication systems and achieved by various means such as using large antenna arrays and/or advanced modulation schemes and signal formats. This work proposes to further imp…
View article: An Experimental Proof of Concept for Integrated Sensing and Communications Waveform Design
An Experimental Proof of Concept for Integrated Sensing and Communications Waveform Design Open
The integration of sensing and communication (ISAC) functionalities have recently gained significant research interest as a hardware-, power-, spectrum- and cost- efficient solution. This experimental work focuses on a dual-functional rada…
View article: Spectrally Efficient FDM System with Probabilistic Shaping
Spectrally Efficient FDM System with Probabilistic Shaping Open
This work proposes and explores the use of probabilistic shaping for the non-orthogonal multicarrier spectrally efficient frequency division multiplexing (SEFDM) system. The system design considers the reverse concatenation architecture wh…
View article: Bandwidth limits of luminescent solar concentrators as detectors in free-space optical communication systems
Bandwidth limits of luminescent solar concentrators as detectors in free-space optical communication systems Open
View article: IEEE Transactions on Terahertz Science and Technology
IEEE Transactions on Terahertz Science and Technology Open
View article: IEEE Transactions on Terahertz Science and Technology
IEEE Transactions on Terahertz Science and Technology Open
View article: Wavelet Classification for Over-the-Air Non-Orthogonal Waveforms
Wavelet Classification for Over-the-Air Non-Orthogonal Waveforms Open
Non-cooperative communications using non-orthogonal multicarrier signals are challenging since self-created inter carrier interference (ICI) exists, which would prevent successful signal classification. Deep learning (DL) can deal with the…
View article: IEEE Transactions on Terahertz Science and Technology
IEEE Transactions on Terahertz Science and Technology Open
View article: Design and Prototyping of Hybrid Analogue Digital Multiuser MIMO Beamforming for Non-Orthogonal Signals
Design and Prototyping of Hybrid Analogue Digital Multiuser MIMO Beamforming for Non-Orthogonal Signals Open
To enable user diversity and multiplexing gains, a fully digital precoding multiple input multiple output (MIMO) architecture is typically applied. However, a large number of radio frequency (RF) chains make the system unrealistic to low-c…
View article: Adjustable testing setup for a single-loop optoelectronic oscillator with an electrical bandpass filter
Adjustable testing setup for a single-loop optoelectronic oscillator with an electrical bandpass filter Open
In this paper we present a novel method to measure the free spectral range FSR and side-mode suppression ratio SMSR of an optoelectronic oscillator OEO by adjusting the optical fiber length using an optical path selector and signal source …
View article: Deep Learning for Over-the-Air Non-Orthogonal Signal Classification
Deep Learning for Over-the-Air Non-Orthogonal Signal Classification Open
Non-cooperative communications, where a receiver can automatically distinguish and classify transmitted signal formats prior to detection, are desirable for low-cost and low-latency systems. This work focuses on the deep learning enabled b…
View article: Non-Orthogonal Signal Transmission Over Nonlinear Optical Channels
Non-Orthogonal Signal Transmission Over Nonlinear Optical Channels Open
The performance of spectrally efficient frequency division multiplexing (SEFDM) in optical communication systems is investigated considering the impact of fiber nonlinearities. Relative to orthogonal frequency division multiplexing (OFDM),…
View article: Duobinary Modulation for Visible Light Communications
Duobinary Modulation for Visible Light Communications Open
International audience
View article: Experimental Demonstration of Staggered CAP Modulation for Low Bandwidth Red-Emitting Polymer-LED Based Visible Light Communications
Experimental Demonstration of Staggered CAP Modulation for Low Bandwidth Red-Emitting Polymer-LED Based Visible Light Communications Open
In this paper we experimentally demonstrate, for the first time, staggered carrier-less amplitude and phase (sCAP) modulation for visible light communication systems based on polymer light-emitting diodes emitting at ~639 nm. The key advan…
View article: Optoelectronic Modelling, Circuit Design and Modulation for Polymer-Light Emitting Diodes for Visible Light Communication Systems
Optoelectronic Modelling, Circuit Design and Modulation for Polymer-Light Emitting Diodes for Visible Light Communication Systems Open
This paper investigates the use of organic polymer light emitting diodes (PLEDs) for the use in visible light communications (VLC). We prepared blue and green emitting PLEDs using commercial light-emitting polymers, and then characterised …
View article: Real-Time Experimental Demonstration of Multi-band CAP Modulation in a VLC System with Off-the-Shelf LEDs
Real-Time Experimental Demonstration of Multi-band CAP Modulation in a VLC System with Off-the-Shelf LEDs Open
We demonstrate, for the first time, m-CAP modulation using off-the-shelf LEDs in a VLC in real time experimental setup using field programmable gate arrays based in universal software radio peripherals (USRPs). We demonstrate transmission …
View article: Experimental Demonstration of Staggered CAP Modulation for Low Bandwidth\n Red-Emitting Polymer-LED based Visible Light Communications
Experimental Demonstration of Staggered CAP Modulation for Low Bandwidth\n Red-Emitting Polymer-LED based Visible Light Communications Open
In this paper we experimentally demonstrate, for the first time, staggered\ncarrier-less amplitude and phase (sCAP) modulation for visible light\ncommunication systems based on polymer light-emitting diodes emitting at ~639\nnm. The key ad…
View article: Real-Time Experimental Demonstration of Multi-band CAP Modulation in a\n VLC System with Off-the-Shelf LEDs
Real-Time Experimental Demonstration of Multi-band CAP Modulation in a\n VLC System with Off-the-Shelf LEDs Open
We demonstrate, for the first time, m-CAP modulation using off-the-shelf LEDs\nin a VLC in real time experimental setup using field programmable gate arrays\nbased in universal software radio peripherals (USRPs). We demonstrate\ntransmissi…
View article: Transimpedance amplifiers with 133 GHz bandwidth on 130 nm indium phosphide double heterojunction bipolar transistors
Transimpedance amplifiers with 133 GHz bandwidth on 130 nm indium phosphide double heterojunction bipolar transistors Open
In this work, the authors present two transimpedance amplifier (TIA) circuits designed for fibre optical interconnect systems. They compare a common base (CB) topology with a common emitter (CE) shunt–shunt feedback topology in terms of fr…
View article: Investigation of WDM VLC Using Standard 5 mm RGB LEDs
Investigation of WDM VLC Using Standard 5 mm RGB LEDs Open
This paper investigates wavelength division multiplexing (WDM) uisng standard off-the shelf commercial 5 mm red, green, blue chip light-emitting diodes for visible light communications (VLC). From the initial observations of the illuminanc…
View article: Non-Orthogonal Multi-band CAP for Highly Spectrally Efficient VLC Systems
Non-Orthogonal Multi-band CAP for Highly Spectrally Efficient VLC Systems Open
In this work we propose and experimentally demonstrate a novel non-orthogonal multi-band carrier-less amplitude and phase (NM-CAP) scheme for bandlimited visible light communication systems in order to increase the spectral efficiency. We …
View article: The First 15 Years of SEFDM: A Brief Survey
The First 15 Years of SEFDM: A Brief Survey Open
Spectrally efficient frequency division multiplexing
\n(SEFDM) is a multi-carrier signal waveform, which achieves
\nhigher spectral efficiency, relative to conventional orthogonal
\nfrequency division multiplexing (OFDM), by violating the …
View article: Non-Orthogonal Multi-band CAP for Highly Spectrally Efficient VLC\n Systems
Non-Orthogonal Multi-band CAP for Highly Spectrally Efficient VLC\n Systems Open
In this work we propose and experimentally demonstrate a novel non-orthogonal\nmulti-band carrier-less amplitude and phase (NM-CAP) scheme for bandlimited\nvisible light communication systems in order to increase the spectral\nefficiency. …
View article: Experimental SEFDM Pipelined Iterative Detection Architecture with Improved Throughput
Experimental SEFDM Pipelined Iterative Detection Architecture with Improved Throughput Open
In spectrally efficient frequency division multiplexing (SEFDM), the separation between subcarriers is reduced below the Nyquist criteria, enhancing bandwidth utilisation in comparison to orthogonal frequency division multiplexing (OFDM). …