This paper develops a multiple channel assignment model, which allows to take advantage of spectrum opportunities in cognitive radio networks in the most efficient way. The developed scheme allows making several assignments of available and frequency adjacent channel, which require a bigger bandwidth, under an equality environment. The hybrid assignment model it is made by two algorithms, one t...

A theoretical analysis of a gap-coupled stacked annular ring microstrip antenna with superstrate is performed in order to obtain wider bandwidth operation. The effects of air gap, superstrate thickness and feeding point location on the antenna performance are analyzed in TM11 mode using equivalent circuit concept. It is noted that the proposed antenna is very sensitive to the feeding point loca...

In medical ultrasound imaging, the axial resolution is l i i t e d by the bandwidth of the transducer. The frequency response of the transducer usually peaks at its center frequency f, but falls off at higher and lower frequencies. In a linear frequency modulation (FM) pulse coding technique for imaging, the frequency can be swept across the entire bandwidth of the transducer. In this technique...

A new receiver architecture for PN code acquisition of signals with high Doppler shifts is proposed, in which the partially correlated outputs of the parallel section of a serialparallel correlator (SPC) are subject to an FFT process before being summed by the serial section. In this way a wider range of frequencies can be searched in a single dwell time, which is particularly useful in a LEOS ...

Because of their fast switching speeds, current measurements for wide band-gap (WBG) devices have become increasingly challenging. Particularly, the designed sensor must be nonintrusive and a small size very bandwidth. One promising is printed-circuit-board (PCB) Rogowski sensor, whose bandwidth only if parasitic parameters its measuring coil are minimized prominently. This presently achieved b...

Our hybrid display model combines multiple automultiscopic elements volumetrically to support horizontal and vertical parallax at a larger depth of field and better accommodation cues compared to single layer elements. In this paper, we introduce a framework to analyze the bandwidth of such display devices. Based on this analysis, we show that multiple layers can achieve a wider depth of field ...

The spectrum of the temporal traces obtained from a phase-sensitive optical time-domain reflectometer is theoretically and experimentally analysed, demonstrating its dependence on the incident optical pulse shape. Numerical simulations and theoretical results are validated experimentally, showing a good matching for rectangular optical pulses. The influence of the photodetector bandwidth on the...