A novel hybrid channel estimator is proposed for multiple-input multiple-output orthogonal frequencydivision multiplexing (MIMO-OFDM) system with per-subcarrier transmit antenna selection having optimal power allocation among subcarriers. In practice, antenna selection information is transmitted through a binary symmetric control channel with a crossover probability. Linear minimum mean-square ...

This paper presents the analysis of IEEE standard for wireless Metropolitan Area Networking i.e. WiMAX system with the implementation of Hybrid Antenna Diversity technique in its physical layer. Currently in the 4G standardized era, the goal of any developing technology is centered around just two features: Fastest performance and Highest accuracy. The development of IEEE 802.16 standard has br...

This paper introduces a wideband adaptive isolator for UHF RFID reader with a minimum component count. The operation of the device is based on a reflection from a variable load, which is connected to a port of a hybrid coupler. The other ports are connected to the RX, TX and Antenna ports of the reader. The isolator provides an isolation of 50 dB from TX to RX at 800 MHz 1 GHz band, covering al...

Efficient simulation of wireless systems requires the development of antenna models compatible with microelectronic tools. This article describes a first behavioral antenna model using the VHDL-AMS language. Moreover, we present a complete behavioral RFID system model using this antenna model. Finally, several system simulation results demonstrate the interest of this approach. Introduction For...

Provision of energy to wireless sensor networks is crucial for their sustainable operation. Sensor nodes are typically equipped with batteries as their operating energy sources. However, when the sensor nodes are sited in almost inaccessible locations, replacing their batteries incurs high maintenance cost. Under such conditions, wireless charging of sensor nodes by a mobile charger with an ant...

Traditional design guidelines for broadband antennas do not always produce satisfactory performance for the desired frequency range of interest. In addition, the accurate prediction of the freespace antenna performance is not sufficient to determine if the antenna will meet a larger system requirement because the performance of the antenna can change significantly when it is installed on a plat...

We propose a push/pull origami antenna, transformable between a single antenna element and a three-element array. In limited space, the proposed origami antenna can work as a single antenna. When the space is not limited and a higher gain is required, the proposed origami antenna can be transformed to a series antenna array by pulling the frame. In order to push the antenna array back to a sing...

Amplitude comparison monopulse antenna arrays produce a sum pattern and a difference pattern, which allow for highly accurate angular measurements to be performed with tracking radars. When a monopulse antenna array is mounted on a platform such as an aircraft, the radiation pattern of the antenna array can change relative to the free space pattern. In particular, the angle and depth of the nul...

Previous work in antenna optimization has primarily focused on applications of optimization algorithms in conjunction with problem-specific or semi-analytic tools. However, recent developments in fast algorithms now offer the possibility of designs and moreover allow for full flexibility in material specification across three dimensions. As an example, this paper combines genetic algorithms (GA...

An optimized design of printed hybrid fractal tree (PHFT) antenna based on binary fractal tree geometry is presented and discussed. In this work miniaturization has been achieved by inserting a modified Koch curve in the conventional fractal binary tree. The geometrical descriptors of the proposed antenna have been synthesized using Bacterial Foraging Optimization (BFO) and Particle Swarm Optim...