Wireless communication technology such as cellular and wireless local area network (WLAN) systems have grown rapidly and generated various competing transmission formats. In the need of seamless communication across incompatible radio standards, software defined radio (SDR) concept has received much attention among researchers working in mobile and personal wireless communications. SDR is a tec...

We present in this paper a wideband RF demodulator using a five-port correlator and a power detector for channel sounding applications. The demodulator has been fabricated using microstrip components. The correlator receives from the five-port qualities that allow it to be low-cost and less sensitive to the phase and amplitude imbalances. A calibration procedure is proposed to find the complex ...

In this work, we consider a class of wireless powered devices employing Hybrid Automatic Repeat reQuest (HARQ) to ensure reliable end-to-end communications over a time-varying channel. By using Simultaneous Wireless Information and Power Transfer (SWIPT), the perpetually powered transmitter transmits information bearing RF signal to the receiver. The receiver has no power source, and relies on ...

The test of radiofrequency (RF) integrated circuits at their ever-increasing operating frequency range requires sophisticated test equipment and is time-consuming and, therefore, very expensive. This paper introduces a new method combining low-frequency actuation signal as test stimuli and signal envelope detection applied on the RF output signal in order to provide a low-cost mean for producti...

Introduction Radiofrequency (RF) spoiling is the most established spoiling method for gradient echo imaging. It is based on a quadratic variation of RF (and receiver) phase angles in successive TRs, coupled with a constant gradient moment at the end of each TR period to create a range of resonance offset angles within each imaging voxel (1). However, it was recognized that RF spoiling yields no...

Material and Methods: The amplifier diagram is shown in Fig. 1. A digital encoded RF pulse is amplified and split into two out-of-phase digital signals through a high speed Emitter Coupled Logic (ECL) comparator. This is demodulated through a band-pass filter and further amplified through a cascade of high-speed differential amplifiers. Two stages of Voltage-Mode Class-D (VMCD) amplifiers boost...

This article is related to the experimental data regarding the ability of MRET Noise Field Generator (MRET NFG) placed at the distance of 7 feet from “phantom head” exposed to RF phones radiation to reduce specific absorption rate (SAR) of the water based solution inside “phantom head”. The core part of Generator is MRET polymer compound. Due to the fractal geometry structure of MRET polymer co...

Introduction CEST contrast employs Chemical Exchange Saturation Transfer to generate contrast in MRI images. It is based on the selective presaturation of the small pool of exchanging protons and can be switched "on" and "off" using suitable RF irradiation (1). Recently, CEST was applied to detect glycosaminoclycans (GAGs) in articular cartilage and intervertebral disc. This method was called g...

In this paper, a new RF/Microwave source is presented. This source is able to generate a Continuous Waveform (CW) signal as well as a modulated signal like GFSK for Bluetooth and GMSK for GSM. The RF source presented here is based on a direct modulation All-Digital Phase-Locked-Loop (ADPLL) architecture that was originally designed for a Bluetooth transmitter in the 2.4GHz in industry, science,...