1,426 research outputs found
Magneto-inductive Passive Relaying in Arbitrarily Arranged Networks
We consider a wireless sensor network that uses inductive near-field coupling
for wireless powering or communication, or for both. The severely limited range
of an inductively coupled source-destination pair can be improved using
resonant relay devices, which are purely passive in nature. Utilization of such
magneto-inductive relays has only been studied for regular network topologies,
allowing simplified assumptions on the mutual antenna couplings. In this work
we present an analysis of magneto-inductive passive relaying in arbitrarily
arranged networks. We find that the resulting channel has characteristics
similar to multipath fading: the channel power gain is governed by a
non-coherent sum of phasors, resulting in increased frequency selectivity. We
propose and study two strategies to increase the channel power gain of random
relay networks: i) deactivation of individual relays by open-circuit switching
and ii) frequency tuning. The presented results show that both methods improve
the utilization of available passive relays, leading to reliable and
significant performance gains.Comment: 6 pages, 9 figures. To be presented at the IEEE International
Conference on Communications (ICC), Paris, France, May 201
Channel Characterisation and Link Budget of MIMO Configuration in Near Field Magnetic Communication
Traditional radio communication has gained significantly from using multiple input and multiple output (MIMO) architecture in the system. Many wireless applications, such as wireless LAN and cellular network, have adopted this technology to improve their system performance. However, the effect of MIMO systems has not been investigated in the case of inductive near field short range communications. The purpose of this paper is to explore a new method for increasing the magnetic communication range using MIMO. Three system models includingMISO, SIMO and MIMO are proposed to characterize the number of transmitters and receivers to the link. These models have helped to extend not only the range but also the communication channel in NFMIC
System Analysis and Design for the Resonant Inductive Near-field Generation System (RINGS)
The Resonant Inductive Near-field Generation System (RINGS) is a technology demonstrator experiment which will allow for the first ever testing of electromagnetic formation flight (EMFF) algorithms in a full six degree of freedom environment on board the International Space Station (ISS). RINGS is a hybrid design, which, in addition to providing EMFF capabilities, also allows for wireless power transfer (WPT) via resonant inductive coupling. This thesis presents an overview of the mechanical and electrical design of the RINGS experiment, as well as simulation techniques used to model various system parameters in both EMFF and WPT operational modes. Also presented is an analytical and experimental investigation of the influence of the proximity effect on a multi-layer flat spiral coil made from ribbon wire
Smart wireless power transmission system for autonomous EV charging
This paper presents a novel localisation method for
electric vehicles (EVs) charging through wireless power transmission
(WPT). With the proposed technique, the wireless charging
system can self-determine the most efficient coil to transmit
power at the EV’s position based on the sensors activated by
its wheels. To ensure optimal charging, our approach involves
measurement of the transfer efficiency of individual transmission
coil to determine the most efficient one to be used. This not only
improves the charging performance, but also minimises energy
losses by autonomously activating only the coils with the highest
transfer efficiencies. The results show that with the proposed
system it is possible to detect the coil with maximum transmitting
efficiency without the use of actual power transmission and
comparison of the measured efficiency. This paper also proves
that with the proposed charger set-up, the position of the receiver
coil can be detected almost instantly, which indeed saves energy
and boosts the charging time
Magneto-Inductive Powering and Uplink of In-Body Microsensors: Feasibility and High-Density Effects
This paper studies magnetic induction for wireless powering and the data
uplink of microsensors, in particular for future medical in-body applications.
We consider an external massive coil array as power source (1 W) and data sink.
For sensor devices at 12 cm distance from the array, e.g. beneath the human
skin, we compute a minimum coil size of 150 um assuming 50 nW required chip
activation power and operation at 750 MHz. A 275 um coil at the sensor allows
for 1 Mbit/s uplink rate. Moreover, we study resonant sensor nodes in dense
swarms, a key aspect of envisioned biomedical applications. In particular, we
investigate the occurring passive relaying effect and cooperative transmit
beamforming in the uplink. We show that the frequency- and location-dependent
signal fluctuations in such swarms allow for significant performance gains when
utilized with adaptive matching, spectrally-aware signaling and node
cooperation. The work is based on a general magneto-inductive MIMO system
model, which is introduced first.Comment: 6 pages, to appear at IEEE WCNC 2019. This work has been submitted to
the IEEE for possible publication. Copyright may be transferred without
notice, after which this version may no longer be accessibl
Novel Conformal Strongly Coupled Magnetic Resonance Systems
Wireless Power Transfer (WPT) is an emerging technology in today’s society. Recently, many advancements to WPT systems have been implemented, such as, the introduction of the Strongly Coupled Magnetic Resonance (SCMR) and Conformal SCMR (CSCMR) methods. These methods allow WPT systems to operate at increased distances with smaller dimensional footprints. However, their range is still limited and needs to be expanded, and their footprint is sometimes large and needs to be miniaturized. Therefore, the goal of this research is to develop new designs and methodologies that can achieve the range extension and miniaturization of CSCMR systems.
Furthermore, many wireless devices are used today in the proximity of the human body (e.g., wearable and implantable applications). Therefore, WPT systems should be safe to use when placed on or inside the human body. To address this need, the secondary goal of this research is to study the effects of WPT systems when placed on or inside the human body
MONITORING AND FAULT DETECTION SYSTEM FOR POWER TRANSMISSION USING GSM TECHNOLOGY
The efficiency of power systems is largely
determined by the effectiveness of the inbuilt power
equipment. Monitoring transmission parameters for faults and
quick isolation of the system from faults helps to improve the
efficiency of the power systems reliability. Current
conventional method has its own limitations due to the
reliance on technical team to carrying out visual inspection in
order to identify any fault. Technologies such as Power line
carrier communication and the use of internet based
communication systems have their respective demerits. In this
paper the scholars presents the study of the use of GSM
technology, to provide a reliable monitoring and fault
detection system. Appropriate designed specific sensors were
used to monitor the changes in transmission parameters such
as voltage, current, temperature and frequency. Whenever
fault occurred the data acquired were transmitted to the utility
mobile phone as SMS via the GSM wireless network. The
system hardware was modeled using Proteus simulation tool
while Mikro-C was used for the software. With this system,
power transmission fault can be detected and isolated at the
shortest possible time
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