The conventional approach to sampling signals or images follows the celebrated Shannon sampling theorem: the sampling rate must be at least twice the maximum frequency present in the signal (the so-called Nyquist rate). In fact, this principle underlies nearly all signal acquisition protocols used in consumer audio and visual electronics, medical imaging devices, radio receivers, and so on. In ...

Due to increasing number of wireless services spectrum congestion is a major concern in both military and commercial wireless networks. To support growing demand for omnipresent spectrum usage, Cognitive Radio is a new epitome in wireless communication that can be used to exploit unused part of the spectrum by dynamically adjusting its operating parameters. While cognitive radio technology is a...

Transform-domain ultra-wideband (UWB) receiver (Hoyos & Sadler, 2006), is a new UWB receiver implementation method, considering a novel approach that utilizes, analog basis expansion of the input signal, followed by parallel sampling of the basis coefficients (Hoyos & Sadler, 2004), to face significant implementation challenges, including achieving sufficient front-end dynamic range, to support...

Two-dimensional (2-D) and, more generally, multidimensional harmonic retrieval is of interest in a variety of applications, including transmitter localization and joint time and frequency offset estimation in wireless communications. The associated identifiability problem is key in understanding the fundamental limitations of parametric methods in terms of the number of harmonics that can be re...

Deformation monitoring and dynamic characteristic analysis of bridge structures are the vital basic requirements for safe operation bridges. In recent years, Global Navigation Satellite System (GNSS) has become increasingly widely used in structural health with development GNSS technology, especially continuous improvement China's Beidou navigation satellite system (BDS). This article summarize...

In this paper a reconfigurable ultra-wideband (UWB) impulse radio (IR) transmitter is presented. The IR signal is synthesized at an intermediate frequency (IF) by employing a multi-Nyquist digital-to-analog converter (DAC) with 12 bit resolution and an update rate of 2.3 GHz. Digital generation of signals in a field programmable gate array (FPGA) guarantees very high flexibility of the reconfig...

Use of a bilinear conformal map to achieve a frequency warping nearly identical to that of the Bark frequency scale is described. Because the map takes the unit circle to itself, its form is that of the transfer function of a first-order allpass filter. Since it is a first-order map, it preserves the model order of rational systems, making it a valuable frequency warping technique for use in au...