Browsing Computer Science & Communications by Issue Date
Now showing items 21-40 of 95
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Optimization of Impedance Plane Reducing Coupling between Antennas
(Scientific Research Publishing, 2011-01)This paper provides a solution for the design optimization of two-dimensional impedance structures for a given elec-tromagnetic field distribution. These structures must provide electromagnetic compatibility between antennas ... -
Inhomogeneous Perforated Reflect-Array Antennas
(Scientific Research Publishing, 2011-03)A new reflect-array antenna structure is proposed. This structure utilizes a perforated substrate as a reflecting surface with the lattice of different holes. The effective electric permittivity of the dielectric substrate ... -
Performance Tradeoff with Routing Protocols for Radio Models in Wireless Sensor Networks
(Scientific Research Publishing, 2011-04)In this paper, we have simulated and evaluated the performance tradeoff with routing protocols: Constrained Flooding, the Real-Time Search and the Adaptive Tree on MICA and MICAz platform with different radio models using ... -
A New Algorithm of Mobile Node Localization Based on RSSI
(Scientific Research Publishing, 2011-04)Position mobile node coordinate is a key component to determine the accuracy and efficiency of positioning in wireless sensor networks. Flexible location algorithm admits to adjust the accuracy and time cost of positioning ... -
MoM Analysis and Design of a Compact Coaxial-to-Microstrip Directional Coupler
(Scientific Research Publishing, 2011-04)In order to overcome the main drawbacks of coaxial, waveguide, and stripline couplers, the analysis and the design of a compact coaxial-to-microstrip directional coupler convenient for power and antenna control application, ... -
A Self-Similar Fractal Cantor Antenna for MICS Band Wireless Applications
(Scientific Research Publishing, 2011-04)Low profile antenna in communication is a new methodology. Fractal geometry is a methodology through which size reduction is achieved. A Self-similar fractal antenna using multicantor technique is proposed and experimentally ... -
Layout Design of LC VCO with Current Mirror Using 0.18 µm Technology
(Scientific Research Publishing, 2011-04)This paper presents a new design of complementary oxide semiconductor voltage controlled oscillator (CMOS VCO) for improve tuning range and phase noise with low power consumption. Design is area efficient and easy to ... -
A Self-Optimization of the Dynamic Resource Management Based on the Cognitive Radio
(Scientific Research Publishing, 2011-04)This paper describes a novel self-optimized approach for resource management based on the cognitive radio in the cellular networks. The cognitive radio techniques offer several features like autonomy, sensing and negotiation. ... -
Reconfigurable Microstrip Double-Dipole Antennas for Personal Wireless Communications
(Scientific Research Publishing, 2011-04)In this paper, a number of reconfigurable antennas are designed to support multiband and wideband wireless applications in different frequency bands in the range between 1 GHz and 6 GHz. The proposed designs consist of ... -
Aperture Coupled Microstrip Antenna for Dual-Band
(Scientific Research Publishing, 2011-04)This paper presents air gap aperture coupled microstrip antenna for dual-band operation over the frequency range of (2.9 to 6.0 GHz). This antenna differs from any other microstrip antenna with their feeding structure of ... -
Error Resilient IPTV for an IEEE 802.16e Channel
(Scientific Research Publishing, 2011-04)Data-partitioning of IPTV video streams is a way of providing graceful quality degradation in a form that will work in good and difficult wireless channel conditions, as experienced by mobile devices. This paper’s proposal ... -
Optimal Territorial Resources Placement for Multipurpose Wireless Services Using Genetic Algorithms
(Scientific Research Publishing, 2011-07)This paper presents a study for finding a solution to the placement of territorial resources for multipurpose wireless services considering also the restrictions imposed by the orography of the territory itself. To solve ... -
Effect of Changes in Sea-Surface State on Statistical Characteristics of Sea Clutter with X-Band Radar
(Scientific Research Publishing, 2011-07)We have made observations of X-band radar sea clutter from the sea surface and sea-surface state in the Uraga Suido Traffic Route, which is used by ships entering and leaving Tokyo Bay, and the nearby Daini Kaiho Sea ... -
Speed-Sensitive Weighting Algorithm for Digital Beamforming of Adaptive Antenna Arrays
(Scientific Research Publishing, 2011-07)One of the main objectives of adaptive antenna array processing is reducing the computational complexity and convergence time in a joint state. This article proposes a speed-sensitive adaptive algorithm for estimating the ... -
Uniticket: A Third Party Universal E-Ticket System Based on Mobile Phone
(Scientific Research Publishing, 2011-07)Prepaid energy meters have been widely adopted by utilities in different countries across the world as an innovative solution to the problem of affordability and consumption management. However, the present smart card based ... -
A Versatile Industrial Timer and Real Time Keeper
(Scientific Research Publishing, 2011-07)Industrial timer requirements are multifaceted. On-delay, off-delay, cyclic or sequential timing requirements, with usual time range varying from seconds to days, depending on the process. Custom build timers cannot provide ... -
Processor for Measuring Radio Network Design Quality
(Scientific Research Publishing, 2011-07)In this paper we present the design and prototyping of an arithmetic processor based on reconfigurable technology, whose purpose is to determine in a parallel manner the quality of the solution in a radio network design ... -
Location Based Performance of WiMAX Network for QoS with Optimal Base Stations (BS)
(Scientific Research Publishing, 2011-07)In this paper we are given concept of our WiMAX (Worldwide Interoperability for Microwave Access) network perfor-mance for QoS monitoring and optimization solution for BS (Base Station) with multimedia application. In the ... -
Measurement of Rain Attenuation in Terahertz Wave Range
(Scientific Research Publishing, 2011-07)ain attenuation at 355.2 GHz in the terahertz wave range was measured with our new 355.2 GHz measuring system under rainfall intensities up to 25 mm/hr. Rain attenuation coefficients were also calculated using four ... -
Spiral Tuning Stub CPW-Fed UWB Slot Offset, Edge Cleft and Edge Slotted Antennas
(Scientific Research Publishing, 2011-07)After the release of the unlicensed Ultra Wideband (UWB) spectrum 3.1 GHz to 10.6 GHz for the commercial purposes by the Federal Communications Commission (FCC), industries and academia pay much attention due to its ...
