Orthogonal frequency division multiplexing (OFDM) is a multi-carrier transmission technique, which divides the available spectrum into many subcarriers, each one being modulated by a low data rate stream[1]. Compare with the traditional ways, the OFDM system has the features of resisting frequency selective fading and high frequency-band utility ratio and so on. OFDM has been successfully appli...

A computer program has been written to investigate the design tradeoffs of high frequency diode frequency multipliers. Velocity saturation and breakdown have been included in a device model that is part of a nonlinear multiple reflection simulation. The device doping, epitaxial layer length and velocity vs. electric field curve are input parameters. The program has a search routine to match the...

abstract: this paper is the first study on the impact of ambient temperature on the electrical characteristics and high frequency performances of double gate armchair graphene nanoribbon field effect transistor (gnrfet). the results illustrate that the gnrfet under high temperature (ht-gnrfet) has the highest cut-off frequency, lowest sub-threshold swing, lowest intrinsic delay and power delay ...

introduction: high frequency alternating currents is a safe, reversible and selective method for nerve conduction block that has been under study during the last decade as a treatment for the diseases involving abnormal neural impulses. however, reducing the stimulus amplitude, and the undesired onset response, as well as optimizing the stimulus parameters for more effective block is still unde...

original article   introduction: a practical solution which is sometimes efficient for noise control in the receiver locations is to enclose workers in an acoustic cabin. accordingly, prediction of the noise insulation performance is regarded as an important aspect of the design a personnel cabin. this study empirically aims to design an acoustic cabin using sandwich panels in a typical metal i...

This paper describes the design of a middle-frequency power transformer, its material composition and magnetic circuit windings, operating in frequency range 800 to 2000Hz, with capacity 200kVA, air-cooled, be fed from suitable converter, characterized by reduced noise. The proposed solution allows implementation galvanically isolated DC-DC converters for auxiliary traction drives other convert...