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Wireless communication in the 60GHz millimeter wave (mm-wave) communications is getting increasing attention as a promising candidate for gigabits per second (Gbps) wireless communication networks. Although multi-Gbps throughput is supported and a very large block of unlicensed spectrum is available worldwide in the 60GHz band, some technical challenges exist towards making 60GHz wireless network...
In this paper, a fuzzy-based information monitoring and communication system especially developed for helping care givers to provide better care to the cared person in a healthcare center is introduced. The fuzzy-based expert system is also developed to conduct the analysis of care-receivers' vital signs which are collected from the vital sign sensors carried by the cared person who maybe stays inside...
This paper proposes the communication system which is constructed image monitoring together with data examined. This system is mainly applied to detect and pre-warm the hillside calamity. Firstly, set up various inducting installations on the monitored hillside. After the examined data are digital coded, these installations will reveal these data by the way of highly brightened LED lights. On the...
Net-centric communications implies the seamless end-to-end interconnectivity between the enterprise wide area networks and the tactical theater, both for reach-back and reach-forward capabilities. No where is this truer than for the Naval forces, with significant investment in the shore, SATCOM and afloat infrastructure. But the evolution to net-centricity is putting pressure on the tactical and subtactical...
The paper presents the implementation of wireless sensor system to California launch vehicle education initiative (CALVEIN) program. The CALVEIN program provides student the opportunity to build, design, and flight test low cost launch vehicles for education and technology development purposes. This enables the researchers to rapidly test new wireless aerospace technologies, which can be used in the...
The aim of this work is the derivation of a tight closed-form approximation for the one dimensional Gaussian Q-function, Q(x) and an exact series representation for the two-dimensional Gaussian Q-function, Q(x,y;p). The accuracy of the expressions is validated through comparisons with existing approximations as well as with results obtained from numerical integrations. Importantly, the derived relationships...
Using six recent years of point rainfall data from seventeen (17) locations in Greece, the CDF of rain for the average year is derived. Original isohyet plots are drawn allowing radio systems engineers to evaluate more accurately the effect of rain to wireless communications systems installed in Greece.
Femtocell, which is also referred to as "Home NodeB" (HNB), is proposed as one of the best complementary approaches for the future wireless communication. It's a low-power, lowcost cellular base station designed to serve a very small area, such as home or office. The scenario where there are several femtocells coexisted is discussed in this paper, which corresponds to the public place such...
The paper presents a GPS-based positioning method mainly used to field rescue. The position and orientation of the rescuer and the trapped are acquired using GPS chip and digital compass. Using the GPS data and compass data, the relative distance and orientation between them are calculated from the geometric relationships based on a series of formulas in Geographic Information Science (GIS). Using...
This paper generalizes a channel quantization method for establishment of secret encryption keys by allowing the second node to shift quantization boundaries based on auxiliary information supplied by the first. Simulations reveal that this enhancement can provide significant improvement in key agreement probability while maintaining key establishment efficiency. While the technique has been demonstrated...
This is the second paper in a series on a new initiative of wireless tomography. The goal is to combine two areas: wireless communication and radio tomography. This paper studies wireless tomography from a system engineering's point of view. Machine learning and waveform diversity will be applied to wireless tomography. The potential system architecture for wireless tomography will also be given.
The objective of this paper is to provide an insight into the impact of microwave circuits in future wireless systems. Wireless systems are considered in general to incorporate a number of wireless paradigms.
Circuit design for wireless applications generally involves achieving a certain level of processing speed, dictated by the data transmission rate and algorithmic performance, while minimizing the energy dissipation. This paper discusses some of the circuit techniques that help to achieve this goal. We show that power reduction in a multimedia system involves trade-offs at the algorithmic, algebraic,...
A communication system plays an important role in SCADA system, and various communication media have been applied to meet the SCADA system's objective. Wireless communication becomes an attractive option as communication network in some cases, such as small amount of data communication for extremely remote substation, remote debugging temporarily for newly-built generation plants and backup communication...
To investigate spectral characteristics of multilevel digital pulse interval modulation (MDPIM) signal, a detailed derivation of it's power spectral density is presented. This mathematical model showed that the spectral profile contains a DC component, nulls at even multiples of the slot frequency, and a distinct slot component with its harmonics, which offers a simpler implementation with slot-synchronization...
Wireless Asynchronous Transfer Mode (WATM) have been proposed by ETSI and ATM Forum for some communications applications. The ATM employs header error control (HEC) to protect the ATM cell header from bit error and/or avoid the miss forwarding of ATM cell. Standard HEC is based on CRC polynomial. Its decoding allows single error correction and it is usually based on exploitation of look-up tables...
Using chalk is not only laborious, but it also produces a lot of chalk dust, polluting the air and adversely affecting the health of the students and teachers. This design uses ARM9 board for hand-held terminal hardware and uC/OS-II embedded real time operating system for hand-held terminal software. When teacher writes on a book-size touch screen with an electrical pen, handwriting signal will be...
In this paper a new technique for reducing the resonance frequency is proposed using two C-slots on the patch which giving the capacitive effect. The unloaded patch antenna has resonance frequency of 3.96 GHz where as the loaded C-slot patch antenna has resonance frequency of 3.28 GHz. The unique features of our proposed C-slot patch antenna are similar radiation patterns with respect to unloaded...
A 2x8 rectangular, mm-wave, slot-loop antenna array using microstrip line feeding with passive phase-shifters was presented to demonstrate antenna array beam pattern impact to network throughput. A multi-beam radiation pattern provided spatial-diversity and mm-wave communication link robustness. When sufficient link margin between transmitter and receiver, a spatially diversified antenna array radiation...
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