Deposits of clastic carbonate-dominated (calciclastic) sedimentary slope systems in the rock record have been identified mostly as linearly-consistent carbonate apron deposits, even though most ancient clastic carbonate slope deposits fit the submarine fan systems better. Calciclastic submarine fans are consequently rarely described and are poorly understood. Subsequently, very little is known especially in mud-dominated calciclastic submarine fan systems. Presented in this study are a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) that reveals a >250 m thick calciturbidite complex deposited in a calciclastic submarine fan setting. Seven facies are recognised from core and thin section characterisation and are grouped into three carbonate turbidite sequences. They include: 1) Calciturbidites, comprising mostly of highto low-density, wavy-laminated bioclast-rich facies; 2) low-density densite mudstones which are characterised by planar laminated and unlaminated muddominated facies; and 3) Calcidebrites which are muddy or hyper-concentrated debrisflow deposits occurring as poorly-sorted, chaotic, mud-supported floatstones. These

Phd by thesis

Ultra Wideband Signals and Systems in Communication Engineering

A general model is introduced which is capable of making accurate, quantitative predictions about the phase noise of different types of electrical oscillators by acknowledging the true periodically time-varying nature of all oscillators. This new approach also elucidates several previously unknown design criteria for reducing close-in phase noise by identifying the mechanisms by which intrinsic device noise and external noise sources contribute to the total phase noise. In particular, it explains the details of how 1/f noise in a device upconverts into close-in phase noise and identifies methods to suppress this upconversion. The theory also naturally accommodates cyclostationary noise sources, leading to additional important design insights. The model reduces to previously available phase noise models as special cases. Excellent agreement among theory, simulations, and measurements is observed.

/pdf/a-general-theory-of-phase-noise-in-electrical-oscillators-4wii1hcvyl.pdf

A General Theory of Phase Noise in Electrical Oscillators

Wiley Series in Microwave and Optical Engineering

Addressing disasters in smart cities through UAVs path planning and 5G communications: A systematic review

Home area networks will have to deal with the future multigigabit wireless systems that are emerging or are under development . These millimeter-wave radio systems achieve data rates up to several Gb/s per channel, but over short distance. So, to expand the radio coverage, we propose to introduce a radio-over-fiber (RoF) infrastructure at home. This paper presents a complete study of a RoF system: the 60 GHz radio coverage is extended using a RoF link working at intermediate frequency with two hops in the air. An experimental setup of such an infrastructure has been realized and characterized. A low-cost solution, working at 850 nm, was chosen using multimode fiber and off-the-shelf millimeter-wave and photonic components. Finally, a real-time transmission between two commercial WirelessHD devices working at 3 Gb/s has been carried out.

https://hal.archives-ouvertes.fr/hal-00789508/document

A 60 GHz Wireless Home Area Network With Radio Over Fiber Repeaters

In view of the realization of short- and medium-range Mobile Front-Haul connections for present (LTE) and future (5G) cellular networks, a cost effective, low-consumption radio over fiber system is proposed, based on 850-nm Single Mode Vertical Cavity Surface Emitting Lasers and Standard Single Mode Fibers (SSMFs). An efficient countermeasure to possible impairments due to the bimodal behavior of SSMFs at 850 nm allows even in critical cases to maintain at high level the quality of the received signal. The performances are evaluated with reference to the Physical Downlink Shared Channel of an entire LTE frame with 20-MHz bandwidth centered in band 20 of the standard. In terms of error vector magnitude and outage probability under temperature stress, the system is able to transmit 256-QAM signals in compliance with the LTE standard, which corresponds to a raw data rate transmission of 134.4 Mbit/s, up to distances of 1.5 km.

VCSEL-Based Radio-Over-G652 Fiber System for Short-/Medium-Range MFH Solutions

Future multigigabit wireless systems (MGWS) dedicated to home-area networking are emerging or are under development. They achieve high data rate up to 5-6 Gb/s over short range. To expand the radio coverage, we propose radio-over-fiber (RoF) architectures, from the most basic (point-to-point) to the most innovative (multipoint-to-multipoint). These RoF infrastructures combine radio and optical links. The simple way to implement RoF technology is to manage the optical media, either using information from the physical (PHY) layer or using information from the media access control (MAC) layer of the radio system.

Radio-Over-Fiber Architectures

The increasing use of optoelectronic devices in high data rate communication systems drives the need of precise electrical circuit modeling that allows the study of important parameters on link performances such as nonlinearity and noise level. In 60-GHz band radio over fiber system, the millimeter-wave signal generation offers simple configuration for the base station. Various techniques have been proposed such as optical heterodyning where the frequency difference between two optical carriers mixed in a photodetector generates the desired electrical carrier. Phase noise and linewidth of the optical sources determine the purity of the generated signal. In this paper, the optical phase noise is integrated into an electrical equivalent model of the laser diode to simulate radio over fiber systems in an electrical simulator. The laser output is represented here in the optical field with both intensity and phase noises. The influence of optoelectronic devices on the modulated analog or complex digital signals can be also analyzed. Two uncorrelated laser diodes are used to generate a millimeter-wave signal. Physical parameters of these lasers are determined from static response and relative intensity noise measurements. Phase noise contribution of individual lasers to the millimeter-wave signal is performed and compared with theoretical expectations.

Electrical Modeling of Semiconductor Laser Diode for Heterodyne RoF System Simulation

We present the design and characterization of SiGe Heterojunction Phototransistors using an 80GHz commercial SiGe Bipolar process. It is shown that 50µm HPTs are exhibits highest gain.bandwidth product of 0.8GHz.A/W compared to the 10µm HPTs

Catherine Algani

Papers

A 60 GHz Wireless Home Area Network With Radio Over Fiber Repeaters

VCSEL-Based Radio-Over-G652 Fiber System for Short-/Medium-Range MFH Solutions

Radio-Over-Fiber Architectures

Electrical Modeling of Semiconductor Laser Diode for Heterodyne RoF System Simulation

Design and implementation of SiGe HPTs using an 80GHz SiGe bipolar process technology