BER and outage probability of DPSK subcarrier intensity modulated free space optics in fully developed speckle.

In this paper a differential phase shift keying (DPSK) subcarrier intensity modulated (SIM) free space optical (FSO) link is considered in negative exponential atmospheric turbulence environment. To mitigate the scintillation effect, the selection combining spatial diversity scheme (SelC) is employed at the receiver. Bit error rate (BER) and outage probability (Pout) analysis are presented with and without the SelC spatial diversity. It is shown that at a BER of 10-6, a maximum diversity gain 25 dB is predicted. And about 60 dBm signal power is required to achieve an outage probability of 10-6, based on a threshold BER of 10-4

Foldable all-textile cavity-backed slot antennas for personal UWB localization

An all-textile multimoded cavity-backed slot antenna has been designed and fabricated for body-worn impulse radio ultra-wideband (IR-UWB) operation in the 3,744-4,742.4 MHz frequency band, thereby covering Channels 2 and 3 of the IEEE 802.15.4a standard. Its light weight, mechanical flexibility, and small footprint of 35 mm x 56 mm facilitate integration into textile for radio communication equipment for first aid responders, personal locator beacons, and equipment for localization and medical monitoring of children or the elderly. The antenna features a stable radiation pattern and reflection coefficient in diverse operating conditions such as in free space, when subject to diverse bending radii and when deployed on the torso or upper right arm of a test person. The high isolation toward the wearer's body originates from the antenna's hemispherical radiation pattern with a -3 dB beamwidth of 120 degrees and a front-to-back ratio higher than 11 dB over the entire band. Moreover, the antenna exhibits a measured maximum gain higher than 6.3 dBi and a radiation efficiency over 75%. In addition, orientation-specific pulse distortion introduced by the antenna element is analyzed by means of the System Fidelity Factor (SFF). The SFF of the communication link between two instances of this antenna is higher than 94% for all directions within the antenna's -3 dB beamwidth. This easily wearable and deployable antenna is suitable to support IR-UWB localization with an accuracy in the order of 5 cm

RFID Applications and Potentials

The economy of the 21st-century enterprise is driven by efficiency, which, among other initiatives, requires enterprise business processes and workflows to be supported by adequate information technology to achieve this efficiency. Information technology plays a key role in transforming enterprises, especially through the way these enterprises conduct business and interact with partners and customers

Modelling of the dielectric properties of trabecular bone samples at microwave frequency

In this paper the dielectric properties of human trabecular bone are evaluated under physiological condition in the microwave range. Assuming a two components medium, simulation and experimental data are presented and discussed. A special experimental setup is developed in order to deal with inhomogeneous samples. Simulation data are obtained using finite difference time domain from a realistic sample. The bone mineral density of the samples are also measured. The simulation and experimental results of the present study suggest that there is a negative relation between bone volume fraction (BV/TV) and permittivity (conductivity): the higher the BV/TV the lower the permittivity (conductivity). This is in agreement with the recently published in vivo data. Keywords: Bone dielectric properties, Microwave tomography, Finite difference time domain.Comment: 10 pages, 5 figures, 4 table

Millimeter-wave Wireless LAN and its Extension toward 5G Heterogeneous Networks

Millimeter-wave (mmw) frequency bands, especially 60 GHz unlicensed band, are considered as a promising solution for gigabit short range wireless communication systems. IEEE standard 802.11ad, also known as WiGig, is standardized for the usage of the 60 GHz unlicensed band for wireless local area networks (WLANs). By using this mmw WLAN, multi-Gbps rate can be achieved to support bandwidth-intensive multimedia applications. Exhaustive search along with beamforming (BF) is usually used to overcome 60 GHz channel propagation loss and accomplish data transmissions in such mmw WLANs. Because of its short range transmission with a high susceptibility to path blocking, multiple number of mmw access points (APs) should be used to fully cover a typical target environment for future high capacity multi-Gbps WLANs. Therefore, coordination among mmw APs is highly needed to overcome packet collisions resulting from un-coordinated exhaustive search BF and to increase the total capacity of mmw WLANs. In this paper, we firstly give the current status of mmw WLANs with our developed WiGig AP prototype. Then, we highlight the great need for coordinated transmissions among mmw APs as a key enabler for future high capacity mmw WLANs. Two different types of coordinated mmw WLAN architecture are introduced. One is the distributed antenna type architecture to realize centralized coordination, while the other is an autonomous coordination with the assistance of legacy Wi-Fi signaling. Moreover, two heterogeneous network (HetNet) architectures are also introduced to efficiently extend the coordinated mmw WLANs to be used for future 5th Generation (5G) cellular networks.Comment: 18 pages, 24 figures, accepted, invited paper

Integrating Internet of Things and EHealth Solutions for Students’ Healthcare

Apple Incorporated’s recent announcement of its entry device – The Apple Watch™ to the wearable’s market can arguably be said to put a final seal of authenticity on wearables. The inevitable ubiquity of wearable devices for eHealth monitoring is a fact soon to be reckoned with. Access to the physiological information provided by the wearables through the ‘6A Connectivity Concept’ of IoT will find positive applications in various fields, most especially in the eHealth and mobile-Health domain. The state of health of a student is key in determining the student’s overall academic performance. Health-related issues usually affect the motivation and ability of students to learn. Therefore it is necessary to provide better health services for students in their various schools and institutions. This paper is a study of the integration of Internet of Things (IoT) and eHealth solutions to effectively manage and monitor university students’ health. One of IoT’s main technologies in healthcare is Radio Frequency IDentification (RFID) technology. In this study, we show how RFID technology is used to implement an eHealth solution known as Electronic Medical Records (EMR) for managing students’ health information (which includes students’ medical history, prescriptions, laboratory results, Electrocardiography (ECG) results, blood pressure results, and vital signs). This paper also studies wearable devices for monitoring students that are at risk for high blood pressure, which can be due to intense stress, overweight conditions, and family history of high blood pressure

Integrating Internet of Things and EHealth Solutions for Students’ Healthcare

Apple Incorporated’s recent announcement of its entry device – The Apple Watch™ to the wearable’s market can arguably be said to put a final seal of authenticity on wearables. The inevitable ubiquity of wearable devices for eHealth monitoring is a fact soon to be reckoned with. Access to the physiological information provided by the wearables through the ‘6A Connectivity Concept’ of IoT will find positive applications in various fields, most especially in the eHealth and mobile-Health domain. The state of health of a student is key in determining the student’s overall academic performance. Health-related issues usually affect the motivation and ability of students to learn. Therefore it is necessary to provide better health services for students in their various schools and institutions. This paper is a study of the integration of Internet of Things (IoT) and eHealth solutions to effectively manage and monitor university students’ health. One of IoT’s main technologies in healthcare is Radio Frequency IDentification (RFID) technology. In this study, we show how RFID technology is used to implement an eHealth solution known as Electronic Medical Records (EMR) for managing students’ health information (which includes students’ medical history, prescriptions, laboratory results, Electrocardiography (ECG) results, blood pressure results, and vital signs). This paper also studies wearable devices for monitoring students that are at risk for high blood pressure, which can be due to intense stress, overweight conditions, and family history of high blood pressure