A5041927134- Radio Frequency Integrated Circuit Design
- Advanced Power Amplifier Design
- Advancements in PLL and VCO Technologies
- PAPR reduction in OFDM
- Analog and Mixed-Signal Circuit Design
- Advanced MIMO Systems Optimization
- Advanced Wireless Communication Techniques
- Microwave Engineering and Waveguides
- Wireless Communication Networks Research
- Full-Duplex Wireless Communications
- VLSI and Analog Circuit Testing
- Energy Harvesting in Wireless Networks
- Electromagnetic Compatibility and Noise Suppression
- Advanced Adaptive Filtering Techniques
- Embedded Systems Design Techniques
- Human Mobility and Location-Based Analysis
- Integrated Circuits and Semiconductor Failure Analysis
- Power Line Communications and Noise
- Cooperative Communication and Network Coding
- Antenna Design and Optimization
- Antenna Design and Analysis
- Wireless Networks and Protocols
- Advanced DC-DC Converters
- Radio Astronomy Observations and Technology
- Advanced Wireless Network Optimization
Ollscoil na Gaillimhe – University of Galway
2023-2025
National University of Ireland, Maynooth
2015-2024
Brown University
2019-2023
Rhode Island Hospital
2019
Technological University Dublin
2019
University of Pennsylvania Health System
2016-2017
National University of Ireland
2005-2017
Nokia (Ireland)
2017
Dublin City Council
2015
Queen Elizabeth Hospital
2010-2012
The adaptive data rate (ADR) algorithm is a key component of the LoRaWAN protocol which controls performance Network. This modifies parameter device based on current wireless conditions. In this article, we present substantive enhancements for End Device and Network Server reduce convergence time devices to reach their optimal rate. We extend module in ns-3 by adding ADR, enabling simulation realistic networks, add implementation new module. simulations show that these modifications can...
We consider small-cell networks with multiple-antenna transceivers and base stations (BSs) cooperating to jointly design linear precoders maximize the network energy efficiency, subject a sum power per-antenna constraints at individual BSs, as well user-specific quality of service (QoS) requirements. Assuming zero-forcing precoding, we formulate problem interest concave-convex fractional program which proposed centralized optimal solution based on prevailing Dinkelbach algorithm. To...
In the last decade, mobile phones and devices using cellular telecommunication network connections have become ubiquitous. several developed countries, penetration of such has surpassed 100 percent. They facilitate communication access to large quantities data without requirement a fixed location or connection. Assuming usually are in close proximity with user, their activities locations indicative user's movements. As such, those may be considered as scale distributed human activity sensing...
In this paper, we revisit the fundamental problem of computing MIMO capacity under per-antenna power constraint (PAPC). Unlike sum counterpart which likely admits water-filling-like solutions, with PAPC has been largely studied framework generic convex optimization. The two main shortcomings these approaches are 1) their complexity scales quickly size, is not appealing for large-scale antenna systems and/or 2) convergence properties sensitive to data. As a starting point, first consider...
A joint power splitting and beamforming design for multiuser multiple-input single-output (MISO) systems where receivers have capability of decoding information harvesting energy simultaneously from received signals is considered. The objective to maximize the ratio achieved utility total consumption subject harvested requirements budget at a base station (BS). function interest combines sum rate power. problem nonconvex, thus, global optimality difficult achieve. To solve this locally we...
We address the issue of network lifetime maximization for a special class wireless sensor networks namely, multi-media networks. High data rates, in these at nodes, compared to conventional and presence high temporal correlation sampled make them suitable candidate in-network processing, primarily node itself. Using distinguishing features our advantage, we have proposed framework achieving an optimal tradeoff between communication computation power consumption leading under delay quality...
We consider a linear precoder design for an underlay cognitive radio multiple-input multiple-output broadcast channel, where the secondary system consisting of base-station (BS) and group users (SUs) is allowed to share same spectrum with primary system. All transceivers are equipped multiple antennas, each which has its own maximum power constraint. Assuming zero-forcing method eliminate multiuser interference, we study sum rate maximization problem subject both per-antenna constraints at...
LPWAN technologies are defined by their focus on extended coverage while maintaining energy efficiency, at the expense of data throughput. In this research we enable analysis LoRa, a key technology, in terms efficiency. We perform real-world measurements standard LoRa chip and use results to develop an consumption module ns-3. Our contributions different states transmission SX1272, transceiver that is used most common LoRaWAN devices, beyond what provided datasheet, for three ns-3 modules...
Orthogonal frequency division multiplexing (OFDM) has become an indispensable part of waveform generation in wideband digital communication since its first appearance audio broadcasting (DAB) Europe 1980s, and it is indeed use. As been seen, the OFDM based waveforms work well with time duplex operation new radio (NR) systems 5G systems, supporting delay-sensitive applications, high spectral efficiency, massive multiple input output (MIMO) compatibility, ever-larger bandwidth signals, which...
Summary Computational modelling of microbiome metabolism has proved instrumental to catalyse our understanding diet-host-microbiome-disease interactions through the interrogation mechanistic, strain- and molecule-resolved metabolic models. We present APOLLO, a resource 247,092 human microbial genome-scale reconstructions spanning 19 phyla accounting for genomes from 34 countries, all age groups, five body sites. explored potential reconstructed strains developed machine learning classifier...
Software-defined radio requires the combination of software-based signal processing and enabling hardware components. In this paper, we present an overview criteria for such platforms current state development future trends in area. This paper will also provide details a high-performance flexible platform called maynooth adaptable system (MARS) that was developed to explore use software-defined concepts provision infrastructure elements telecommunications application, as mobile phone...
Modern wireless network operators are consistently looking for improvements in the access infrastructure that minimize size, weight, and power. Therefore, compact multiband RF wideband solutions offer an attractive role forthcoming fifth generation networks. This paper presents a novel transmitter architecture is based upon undersampled digital predistortion (DPD) methodology. The proposed minimizes required number of RF/analog components system by using RF-DAC-based direct sampling at...
This paper proposes an efficient (semi-closed-form) zero-forcing (ZF) precoder design for the weighted sum-rate maximization problem under per-antenna power constraint (PAPC). Existing approaches this are based on either interior-point methods that do not favorably scale with size or subgradient widely known to converge slowly. To address these shortcomings, our proposed method is derived from three elements: minimax duality, alternating optimization (AO), and successive convex approximation...
New wireless technologies have been developed in recent years which enable applications that require the transmission of small amounts data over long distances an energy efficient manner. One these technologies, LoRaWAN, includes a server-initiated communication mode named Class B provides deterministic latency for downlink communications. In this paper, we model LoRaWAN ns-3 to explore limits scale at form bi-directional remains feasible large networks. The simulation results show principle...
This paper presents a wideband voltage controlled oscillator topology based on an active inductor generating negative resistance. The proposed architecture covers frequency band between 1.325 GHz - 2.15 with average in-band phase noise of -86 dBc/Hz at 1 MHz offset from the carrier frequency. Power consumption core is 28 mW 1.8 V supply. circuit has been simulated in Eldo RF (Design Architect IC, Mentor Graphics) using UMC 0.18 mum 1P6M Salicide CMOS model libraries.
The development to date of the bounds for outputs integrators second-order sigma-delta modulators has relied on a mixture theoretical analysis and extensive use simulation. This paper presents new approach that analyzes behavior such systems, identifies external boundaries trapping region integrators. With this approach, it is possible develop tight results standard modulator with constant input, without need flexible, can be adapted other architectures, gives strong insight into these systems.
In this paper, we present a novel and effective linearization technique for nonlinear phased array antennas. For large arrays, of the using single digital predistortion (DPD) is inevitable since one path upconverted feeds several RF transmission paths, each which connected to power amplifier (PA) an antenna element. However, critical issue that PA characteristics can vary considerably within array. Thus, linearizing individual PAs with DPD rather challenging. We formulate solve optimization...
As part of an ongoing search for novel molecules with therapeutic potential we examined the mediator release inhibition activity a number indanones and their derivatives. The aldol condensation product 18 was approximately twice as potent disodium cromoglycate inhibitor compound 48/80-stimulated histamine from rat peritoneal mast cells. this class dimeric indanone is significantly higher than controls may represent new cell stabilizing agents. Compound has been selected further biological...
Transmitter leakage is caused by limited isolation between Tx and Rx paths of an frequency-division duplexing (FDD) transceiver due to use non-ideal duplexers. As the can seriously impair performance receiver, it important increase existing system. A portion falling into band can't be removed using conventional band-pass techniques, which leads exploration active cancellation methods. This paper presents structure with adaptive delay filter, together a related design methodology. Based on...
In this paper, a novel outphasing power amplifier (PA) based on class-E amplifiers with shunt capacitances and filters is proposed. The new design provides high drain efficiency for both peak back-off levels. A mathematical model the capacitance filter presented. proposed enables derivation of load circuit parameters that provide optimum levels using closed form expressions. Based model, an designed subsequently implemented microstrip transmission lines GaN HEMT devices. fabricated prototype...