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The growth of high mobility two-dimensional hole gases (2DHGs) using GaAs-GaAlAs heterostructures has been the subject of many investigations. However, despite many efforts hole mobilities in Be-doped structures grown on (100) GaAs substrate remained considerably lower than those obtained by growing on (311)A oriented surface using silicon as p-type dopant.(More)
— This paper presents the simulation of Worldwide Interoperability for Microwave Access (WiMAX) system based on Orthogonal Frequency Division Multiplexing (OFDM) with different adaptive modulation techniques. WiMAX is the next generation broadband wireless technology which offers greater range and bandwidth compared to the other available broadband wireless(More)
  • Ahmad Joraimee Mohamad, Md Shukor, +19 authors Abd
  • 2014
The design FSS structure consists of FSS structures placed on the FR4 and glass. The square loop FSS is designed and simulated using the CST Microwave Studio software at 2.4 GHz based on industrial, scientific and medical bands (ISM) standard. The reflection (S11) and transmission (S21) of the design FSS structure is analyzed based on the six types of(More)
—In modern communication systems, nonlinearity in power amplifiers (PAs) and in-phase and quadrature-phase (I/Q) imperfections in the transmitter are of enormous concern. With the increase in the importance for highly energy efficient and low complexity models, there is a need to develop low complexity digital predistortion (DPD) methods. In this paper, we(More)
Nonlinearity in power amplifiers and in-phase and quadrature-phase (I/Q) imperfections in the transmitter are of enormous concern. Two models to alleviate these imperfections have been proposed. The first method employs a Rational Function based model for the joint mitigation of these impairments, while the second method is a Memory Polynomial based(More)
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