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Search Results: 1 - 10 of 10729 matches for " Short Range Wireless Technologies "
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Intelligent Transportation Systems Using Short Range Wireless Technologies  [PDF]
Razi Iqbal, Kenichi Yukimatsu
Journal of Transportation Technologies (JTTs) , 2011, DOI: 10.4236/jtts.2011.14017
Abstract: In this paper, we propose using ZigBee for Intelligent Transportation System (ITS). Most of the accidents these days are caused because of drivers not knowing the upcoming traffic hurdles like curves, traffic signals, railway lines and etc. If drivers come to know about the upcoming signals, curves, and railways lines etc the accidents can be avoided. The aim is to provide drivers with intelligent roads so that they can receive the information about the curves and the traffic signals ahead. After receiving the information about the signals ahead, drivers will be careful; this will help avoid the road accidents. Many researches are taking place in the world in the field of ITS and many useful systems are also built but no system is built using this remarkable ZigBee technology. ZigBee is low cost as compared to other short range wireless technologies which will help reduce the total cost of the system, enabling this system to be deployed in developing countries as well.
Under Water Optical Wireless Communications Technology for Short and Very Short Ranges
Abd El–Naser A. Mohamed,Ahmed Nabih Zaki Rashed,Amina E. M. El-Nabawy
International Journal of Information Technology and Computer Science , 2012,
Abstract: This paper has presented our interest in wireless underwater optical communications. Recent interest in ocean exploration has brought about a desire for developing wireless communication techniques in this challenging environment. Due to its high attenuation in water, a radio frequency (RF) carrier is not the optimum choice. Acoustic techniques have made tremendous progress in establishing wireless underwater links, but they are ultimately limited in bandwidth. In traditional communication systems, constructing a link budget is often relatively straight forward. In the case of underwater optical systems the variations in the optical properties of sea water lead to interesting problems when considering the feasibility and reliability of underwater optical links. The main focus of this paper is to construct an underwater link budget which includes the effects of scattering and absorption of realistic sea water. As well as we have developed the underwater optical wireless communication systems to have shorter ranges, that can provide higher bandwidth (up to several hundred Mbit/sec) communications by the assistant of exciting high brightness blue LED sources, and laser diodes suggest that high speed optical links can be viable for short range application.
PERFORMANCE ANALYSIS OF NONDIRECTED IR WIRELESS CHANNEL IN INDOOR ENVIRONMENT USING STATISTICAL DISTRIBUTION..
PRAKASH PATIL,DILIP SHAH.,SHRIKANT BODHE
International Journal of Engineering Science and Technology , 2012,
Abstract: The future short range wireless communication in an indoor environment jncludes the nondirected Infrared (IR) Wireless communication. It is essential since there is a tremendous growth of bigger residential and commercial complexes. Also, nowadays use of portable devices such as LAPTOP, PDA etc. has been increased and the connectivity to such devices is the must without any interruption. In indoor environment both the transmitter and receiver are located inside the room. An empty rectangular is considered for the simulationpurpose. The major interest in this simulation deals with the diffuse configuration (Non-directed Non-LOS) of the transmitter and the receiver. The IR wireless channel modeling is performed with multipath IR signals transmitted by the IR Transmitter and received by the receiver after multiple reflections from the reflecting surfaces such as ceiling, floor walls etc.Impulse response is the fundamental predictor of IR channel modeling and it is characterized by using Monte Carlo simulation.This paper estimates the mean received power and variance for different statistical distributions such as Rician, Gamma and Nakagami derived from histograms curve fitting for various receiver heights and radii. in time domain approach.
VEHICLE-TO-INFRASTRUCTURE COMMUNICATION BASED ON IEEE 802.11G
Janis Jansons,Nikolajs Bogdanovs,Aleksandrs Ipatovs
International Journal of Digital Information and Wireless Communications , 2012,
Abstract: Vehicle-to-infrastructure (V2I) communication based on wireless local area network (WLAN) IEEE 802.11 standard technology can support user in-motion to achieve preferable Internet connectivity. Wireless access for the vehicular environment (i.e. IEEE802.11p) provides the required standardization for vehicle-to-vehicle V2X communication solutions supporting raw data rate up to 27 Mbps. This standard is created for urgent short message transmission. Otherwise, for transmission of large amount of data alternative solutions may be proposed. In this paper we present an experimental study of IEEE802.11g using off-the-shelf devices in vehicle-to-infrastructure small scale scenario. In order to evaluate the V2I the type of communication in large scale scenario, in this paper we propose analytic model to characterize the goodput of WLAN-based networks using Markov process
Application of wireless monitoring and communication systems in the power engineering
Grechikhin V. A.,Zamolodchikov V. N.,Smolskiy S. M.
Tekhnologiya i Konstruirovanie v Elektronnoi Apparature , 2012,
Abstract: The article describes some achievements of modern radio electronics, which prove a huge potential of modern wireless engineering for using in the fuel-energy complex. Wireless corporation communication systems, application of short-range radar measuring systems on the power engineering objects, prospects of laser measuring systems, methods of radio thermography and radio spectroscopy, wireless acoustic-electronic sensors are discussed.
Single-Chip Fully Integrated Direct-Modulation CMOS RF Transmitters for Short-Range Wireless Applications
Munir M. El-Desouki,Syed Manzoor Qasim,Mohammed BenSaleh,M. Jamal Deen
Sensors , 2013, DOI: 10.3390/s130809878
Abstract: Ultra-low power radio frequency (RF) transceivers used in short-range application such as wireless sensor networks (WSNs) require efficient, reliable and fully integrated transmitter architectures with minimal building blocks. This paper presents the design, implementation and performance evaluation of single-chip, fully integrated 2.4 GHz and 433 MHz RF transmitters using direct-modulation power voltage-controlled oscillators (PVCOs) in addition to a 2.0 GHz phase-locked loop (PLL) based transmitter. All three RF transmitters have been fabricated in a standard mixed-signal CMOS 0.18 μm technology. Measurement results of the 2.4 GHz transmitter show an improvement in drain efficiency from 27% to 36%. The 2.4 GHz and 433 MHz transmitters deliver an output power of 8 dBm with a phase noise of ?122 dBc/Hz at 1 MHz offset, while drawing 15.4 mA of current and an output power of 6.5 dBm with a phase noise of ?120 dBc/Hz at 1 MHz offset, while drawing 20.8 mA of current from 1.5 V power supplies, respectively. The PLL transmitter delivers an output power of 9 mW with a locking range of 128 MHz and consumes 26 mA from 1.8 V power supply. The experimental results demonstrate that the RF transmitters can be efficiently used in low power WSN applications.
Characterization of Radiolucent and Electro-Magnetic Properties of Polymer PEDOT: PSS for Radiological Applications  [PDF]
Laura Guérin, Christophe Loyez, Kamel Guerchouche, Fouad Maaloul
Open Journal of Organic Polymer Materials (OJOPM) , 2017, DOI: 10.4236/ojopm.2017.72002
Abstract: The deployment of wireless technologies in the radiology field requires development of radiolucent materials allowing wireless communication. In this paper, both the radiolucency (X-rays) and Electro-Magnetic (EM) properties of the conductive polymer poly (3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) are investigated to address wireless applications in the field of the radiology. A model was developed to predict the PEDOT:PSS performance and assess the interest of this material in terms of radiolucency characteristics and Electro Magnetic (EM) radiation efficiency. A PEDOT:PSS antenna operating in the Radio-Frequency Identification (RFID) Ultra High Frequency (UHF) band, was realized to experimentally validate abilities of PEDOT:PSS. These performances are compared with those produced by a similar antenna made of conventional materials such as copper. Experimental results validate the numerical model of the designed structure. This paper demonstrates the potential of polymer materials in the field of x-ray imaging.
Spring Theory as an Approach to the Unification of Fields  [PDF]
Ling Man Tsang
Journal of Modern Physics (JMP) , 2016, DOI: 10.4236/jmp.2016.715192
Abstract: The cosmological constant is necessary to be retained in Einstein’s field equations with value depending on the mass of the source. An overview of the spring theory in astrophysics and cosmology is included in this paper. In short range force, the two interacting particles are point-like vertices connected by a bosonic spring. We also suspect that electron may contain negative sterile neutrino. The self energy of a point charge is not infinite so that renormalisation is not necessary.
Comparison of Indoor Localization Systems Based on Wireless Communications  [PDF]
Rejane Dalce, Thierry Val, Adrien Van Den Bossche
Wireless Engineering and Technology (WET) , 2011, DOI: 10.4236/wet.2011.24033
Abstract: Localization using a Wireless Sensor Network (WSN) has become a field of interest for researchers in the past years. This information is expected to aid in routing, systems maintenance and health monitoring. For example, many projects aiming to monitor the elderly at home include a personal area network (PAN) which can provide current location of the patient to the medical staff. This article presents an overview of the current trends in this domain. We introduce the mathematical tools used to determine position then we introduce a selection of range-free and range-based proposals. Finally, we provide a comparison of these techniques and suggest possible areas of improvement.
Editorial
Simone Frattasi,Nicola Marchetti,Muhammad Imadur Rahman,Ernestina Cianca
Journal of Communications , 2009, DOI: 10.4304/jcm.4.3.143-145
Abstract: The use of the Internet for more entertainment-like services, which is a major component in the dramatic change of broadband services and expectations, is leading to a continued growth in the demand for higher capacity in wireless systems. This is one of the reasons that are driving the wireless industry to strive harder for designing more bandwidth efficient system. As an example; music file swaps and downloads are growing at an annual rate of 50% to 60%, and video downloading and streaming are so bandwidth intensive that they may already account for 50 to 60% of all wireless traffic at this moment. This fast-rising demand for bandwidth will reach the limits in terms of data rates not only for currently available technologies such as Wi-Fi and 3G, but even for upcoming high data rate systems, such as UTRA-LTE and WiMAX systems, which can achieve much higher bandwidth efficiencies compared to previous systems, such as GSM, WCDMA, etc. Moreover, the growth in capabilities of consumer devices (e.g., 60 frames/s Ultra-HDTV targeted for a mass market 10 years from now) and futuristic applications such as 3D Internet, virtual and augmented reality and telepresence will lead in the forthcoming years to capacity needs of the order or multi-gigabits per second. These data rates are today only achievable with optical fibers. Within the realm of wireless communication, a first step towards this goal is represented by IMT-Advanced (IMT-A) systems, currently specified by the International Telecommunications Union (ITU). IMT-A systems are expected to provide peak data-rates in the order of 1Gbit/s in local area and 100Mbit/s in wide area scenarios. The deployment of these kinds of systems at mass market level is believed to take place around year 2015 and these systems will facilitate what has already been a buzzword for the last decade, namely “4G”. The ability to offer such high data rates in 100MHz bandwidth requires overall a very high spectral efficiency, and hence the need for multi-antenna techniques (MIMO) with spatial multiplexing, fast dynamic link adaptation and packet scheduling, wideband access techniques, and most likely non-contention based spectrum sharing among multiple operators. Moreover, to achieve this performance level, major advancements in the state-of-the-art are required in several key technologies, spanning
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