Search
Now showing items 1-10 of 15
Hybrid Amplification: An Efficient Scheme for Energy Saving in MIMO Systems
(Scientific Research Publishing, 2012-01)
In this paper, a new amplification scheme for adaptive MIMO systems is proposed and tested. In this ‘hybrid amplification’ configuration, different amplifiers with different peak powers are used. In this way, each transmitter ...
Wireless Hybrid QoS Architecture with an Enhancement of Fair Intelligent Congestion Control
(Scientific Research Publishing, 2012-07)
More subtle and explicit QoS control mechanisms are required at the radio access level, even though the simple and scalable Differentiated Services (DiffServ) QoS control model is acceptable for the core of the network. ...
Throughput Maximizing Frequency and Power Scheduling for Wireless Ad-Hoc Networks in the Low-SINR Regime
(Scientific Research Publishing, 2012-07)
We study the problem of frequency and power allocation and scheduling at a time-slotted cognitive ad-hoc wireless network, where cognitive nodes share a number of frequency bands and frequency reuse is allowed. In such a ...
Interference Mitigation MAC Protocol for Cognitive Radio Networks
(Scientific Research Publishing, 2012-04)
The growing demand for wireless services coupled with the limited availability of suitable electromagnetic spectrum is increasing the need for more efficient RF spectrum utilization. Spectrum allocated to TV operators can ...
Microstrip Ultra-Wideband Filter with Flexible Notch Characteristics
(Scientific Research Publishing, 2012-01)
A microstrip ultra-wideband (UWB) filter with unique shape, compactness, simplicity of operation and flexible notch characteristics is introduced. It is based on the fundamental and harmonic characteristics of a 50 Ohm ...
A Comprehensive Parametric Study of Planar Inverted-F Antenna
(Scientific Research Publishing, 2012-01)
This paper presents a comprehensive numerical and experimental study of Planar Inverted-F Antennas (PIFA) involving all the parameters which may affect the characteristics of PIFA. It is found that PIFA characteristics are ...
Generalized PIC Detector for Distributed STBC under Quasi-Synchronization
(Scientific Research Publishing, 2012-01)
In this paper, we propose a Generalized Parallel Interference Cancelation (G-PIC) approach for the detection of D-STBC under Quasi-Synchronization in the case of any number of relay nodes with just statistical information ...
Energy-Efficient and Coverage-Aware Clustering in Wireless Sensor Networks
(Scientific Research Publishing, 2012-07)
Energy efficiency and sensing coverage are essential metrics for enhancing the lifetime and the utilization of wireless sensor networks. Many protocols have been developed to address these issues, among which, clustering ...
A Wideband Circularly Polarized Patch Antenna for 60 GHz Wireless Communications
(Scientific Research Publishing, 2012-07)
This paper presents the design of a fully packaged 60 GHz wideband patch antenna incorporating an air cavity and a fused silica superstrate. Circular polarization (CP) is realized by introducing a diagonal slot at the ...
Design of Low Power and High Speed CMOS Comparator for A/D Converter Application
(Scientific Research Publishing, 2012-04)
This paper presents an improved method for design of CMOS comparator based on a preamplifier-latch circuit driven by a clock. Design is intended to be implemented in Sigma-delta Analog-to-Digital Converter (ADC). The main ...