Most of the MR image accelerating methods suffer from degradation of acquired images, which is often correlated with the degree of acceleration. However, Wideband MRI is a novel technique that transcends such flaws. In this study we demonstrate that Wideband MRI is capable of obtaining images with identical quality as conventional MR images in terms of SNR, CNR (contrast-to-noise ratio) and ima...

Title of Dissertation: SYNTHESIS AND DESIGN OF MICROWAVE WIDEBAND FILTERS AND COMPONENTS Wei Meng, Doctor of Philosophy, 2014 Directed By: Professor Kawthar A. Zaki, Department of Electrical and Computer Engineering In the development of modern communication systems, various stringent requirements are imposed on the hardware components to support emerging applications. There is broad interest i...

iv interferer combinations that lead to in-band distortion in wideband receivers, resulting in challenging linearity requirements. At the start of this research project, the noise canceling technique was identified as a suitable candidate to implement wideband receiver frontends. In a preceding research project a number of noise canceling topologies were generated. One of these topologies, the ...

In this pare, a wideband three-order bandpass filter (BPF) is proposed. The proposed wideband filter is designed using the substrate integrated waveguide (SIW) structure by loading T-shape slots. A BPF with two resonators is formed by etching T-shape slots with different size on the top metal plane of the SIW structure. The filter is investigated with the theory of coupled resonator circuits. T...

The Adaptive Multi-Rate Wideband (AMR-WB) speech codec algorithm has been selected for wideband speech coding in wireless and wireline services by both 3GPP and ITU-T. This paper describes an implementation of floating point Adaptive Multi-Rate Wideband (AMR-WB) codec that was approved by the Third Generation Partnership Project (3GPP) for multimedia applications.

A 50 to 550MHz wideband gallium nitride (GaN) HEMT power amplifier with over 43 dBm output power and 63% drain efficiency has been successfully developed. The demonstrated wideband power amplifier utilizes two GaN HEMTs and operates in a push-pull voltage mode Class D (VMCD). The design is based on a large signal simulation to optimize the power amplifier’s output power and efficiency. To assur...

In this paper we present the design of multiband linear subband prediction (LSP) filters for wideband signals. A wideband signal is divided into narrowband subband signals via an array of lowpass/bandpass filters. A linear prediction filter is designed for each subband channel, which has its own designated frequency interval. The filter coefficients are fixed throughout the coding process. A cl...

This paper studies the use of warped linear prediction (WLP) for wideband parametric speech synthesis. As the sampling frequency is increased from the usual 16 kHz, linear frequency resolution of conventional linear prediction (LP) cannot efficiently model the speech spectrum. By using frequency warping that weights perceptually the most important formant information, spectral models with bette...

The data rates required to support multimedia services over wireless communication systems is rapidly increasing. Mobile radio propagation channel characteristics play a very important role in assessing the performance of a wireless wideband communication system. The mean excess delay and RMS delay spread are the two main parameters that dominate wideband propagation characteristics. The wideba...

In this paper, we propose two spectral cyclic MUSIC DOA estimation algorithms for wideband cyclostationary signals: the wideband spectral cyclic conjugate MUSIC (WSCCM) algorithm and the extended wideband spectral cyclic MUSIC (EWSCM) algorithm. The proposed algorithms can be applied to estimate the spectral cyclic conjugate correlation matrix and the extended spectral cyclic correlation matrix...