This paper describes a statistical signal-processing method for exploiting narrowband bistatic RF measurements to detect and track moving people (hereafter referred to as "dismounts"). In our approach, RF measurements are made by a constellation of narrowband radar units, arranged around a surveillance region. There are several benefits of narrowband radar in this application, which we describe...

Nonlinear effects, or non-Wiener behavior, have been observed in several adaptive filtering applications, such as adaptive equalization of wideband communication signals contaminated by narrowband interference, adaptive narrowband noise cancellation, and adaptive linear prediction of narrowband processes. The nonlinear effects have been especially prominent when narrowband processes have been i...

Motivated by Thomson's multiple taper spectral estimation technique, we derive a new, robust procedure for automatically separating time series data into its constituent narrowband and broadband time series components. The new procedure avoids the pitfalls of adaptive notch lters, PCI method, or other similar algorithms, of mistaking and ltering local spectral peaks of the broadband component a...

This paper extends and complements previous research we have performed on the performance of nonadaptive narrowband suppression filters when used in cellular codedivision multiple-access (CDMA) overlay situations. In this paper, an adaptive least mean square (ILMS) filter is applied to a cellular CDMA overlay in order to reject narrowband interference. An accurate expression for the steady-stat...

Some of the differences between broadband and narrowband sonar systems applied in fisheries hydroacoustics are examined. Following a brief discussion of the advantages and disadvantages of broadband sonar, three different aspects of narrowband and broadband sonar systems are compared: detection, Doppler processing, and split-beam localization. Summaries are provided that compare representative ...

This paper addresses the problem of reconstructing wideband speech signals from observed narrowband speech signals. The goal of this work is to improve the perceived quality of speech signals which have been transmitted through narrowband channels or degraded during acquisition. We describe a system, based on linear predictive coding, for estimating wideband speech from narrowband. This system ...

In recent years research in the area of artificial bandwidth extension (BWE) of speech signals has made significant progress. The intention of BWE is to produce wideband speech with a cut-off frequency of for instance 7 kHz from a narrowband version (e.g., with telephone bandwidth, i.e., 300Hz − 3.4 kHz). The respective algorithms are based on the estimation of parameters of a source model for ...

Narrowband photodetectors have broad application prospects in many fields where only a range of specific wavelengths light needs to be detected. However, the current narrowband detectors some disadvantages, such as integration is difficult, full width at half-maximum not narrow enough, and spectral rejection ratio ideal (≤20). Here, we present self-filtering photodetector based on MAPbX3 single...

background: wearing spectacles is the most common approach in correcting the refractive errors worldwide. due to harmful effects of overexposure to solar ultraviolet radiations, the usage of multi-layer coatings in ophthalmic lenses has recently been increased. these lenses can reduce the reflections and hence increase the transmission of visible light; they can also decrease the transmission o...

The 'rnuffl~d' quality of coded .peech, which arises from the handlimiling ofspeech to 4 kHz, can be reduced either by coding speed! with a wider bandwidth or by widcband enhancement of the narrowband coded speech. ThL~ paper investigates the limitations of wideband enbancement and pO)Ssibilities for its improvement A new wideband coding scheme is prop()sed thaI i. based 00 any narrowband coder...