Browsing by Keywords "Signal to noise ratio"
Now showing items 120 of 31

Anisotropy sensitivity of an acoustic lens with slit aperture
(IEEE, 1993)A conventional spherical acoustic lens is modified by restricting its aperture in the form of a slit to provide directional sensitivity. The spacing between the two parallel absorbing sheets forming the slit is adjustable ... 
Capacity bounds for an ultrawideband channel model
(IEEE, 200410)There is an ongoing effort by the IEEE 802.15.3a subcommittee to reach a UWB personal area network standard. We estimate the achievable rates for such networks using a channel model specified by the same group. The analysis ... 
Comparison of the CAFDF and sage algorithms in multipath channel parameter estimation
(IEEE, 200807)In this paper, performance of the recently proposed Cross Ambiguity Function  Direction Finding (CAFDF) technique is compared with the Space Alternating Generalized Expectation Maximization (SAGE) technique. The CAFDF, ... 
Compressive sensingbased robust offthegrid stretch processing
(Institution of Engineering and Technology, 2017)Classical stretch processing (SP) obtains high range resolution by compressing large bandwidth signals with narrowband receivers using lower rate analoguetodigital converters. SP achieves the resolution of the large ... 
Çokyollu kanal parametre kestirimi için yeni bir dizilim sinyal işleme tekniği
(IEEE, 200706)Bu bildiride, çarpraz belirsizlik işlevinin kullanıldığı yeni bir dizilim sinyal işleme tekniği önerilmektedir. Geliştirilen teknik bir algılayıcı dizilimine gelen sinyallerden herbirinin geliş yönünü (GY), zaman gecikmesini ... 
Çokyollu ortamda çapraz belirsizlik işleviyön bulma tekniğinin başarım analizi
(IEEE, 200804)Bu bildiride, Çapraz Belirsizlik İşleviYön Bulma (CAFDF) tekniğinin çokyollu ortamlardaki sinyallerin zaman gecikmesi, Doppler kayması, geliş yönü(GY) ve genlik kestirimindeki başarımı ile yiiksek çözünürlüklü algoritmalar ... 
Deepcollapse operation of capacitive micromachined ultrasonic transducers
(IEEE, 2011)Capacitive micromachined ultrasonic transducers (CMUTs) have been introduced as a promising technology for ultrasound imaging and therapeutic ultrasound applications which require high transmitted pressures for increased ... 
Downlink beamforming under individual SINR and per antenna power constraints
(IEEE, 200708)In this paper we consider the problem of finding the optimum beamforming vectors for the downlink of a multiuser system, where there are individual signal to interference plus noise ratio (SINR) targets for each user. ... 
Fast processing techniques for accurate ultrasonic range measurements
(Institute of Physics Publishing, 2000)Four methods of range measurement for airborne ultrasonic systems  namely simple thresholding, curvefitting, slidingwindow, and correlation detection  are compared on the basis of bias error, standard deviation, total ... 
The fractional fourier transform and its applications to image representation and beamforming
(ASME, 200309)The ath order fractional Fourier transform operator is the ath power of the ordinary Fourier transform operator. We provide a brief introduction to the fractional Fourier transform, discuss some of its more important ... 
Huber function based reconstruction in accelerated phasecycled bSSFP acquisitions for increased detection performance
(IEEE, 2017)Balanced steadystate free precession imaging suffers from irrecoverable signal losses, called banding artifacts. A common way to alleviate banding artifacts without sacrificing scanefficiency is to use multipleacquisition ... 
Image reconstruction for Magnetic Particle Imaging using an Augmented Lagrangian Method
(IEEE, 2017)Magnetic particle imaging (MPI) is a relatively new imaging modality that images the spatial distribution of superparamagnetic iron oxide nanoparticles administered to the body. In this study, we use a new method based on ... 
In situ synthesis of biomolecule encapsulated goldcrosslinked poly(ethylene glycol) nanocomposite as biosensing platform: A model study
(Elsevier BV, 2010)In situ synthesis of poly(ethylene glycol) (PEG) hydrogels containing gold nanoparticles(AuNPs) and glucose oxidase (GOx) enzyme by photoinduced electron transfer process was reported here and applied in electrochemical ... 
Microfabricated ultrasonic transducers: towards robust models and immersion devices
(IEEE, 199611)The successful fabrication of ultrasonic immersion transducers is reported. Transducers are observed to operate from 1 MHz to 20 MHz in water, with the frequency range limited by electronics, not the transducers. Transmission ... 
Mode separation and direction of arrival estimation in HF links
(WileyBlackwell Publishing, 2003)Estimation of arrival angles and incoming signals is a challenging problem for HF channels where the signals are correlated and the separation between the signals can be as low as a couple of degrees. In this paper, a new ... 
On probability of success in linear and differential cryptanalysis
(Springer New York LLC, 200801)Despite their widespread usage in block cipher security, linear and differential cryptanalysis still lack a robust treatment of their success probability, and the success chances of these attacks have commonly been estimated ... 
Performance comparison of four timeofflight estimation methods for sonar signals
(19980806)Performances of four methods of timeofflight estimation for sonar signals are compared in terms of their bias, standard deviation and complexity: thresholding, curve fitting, moutofN slidingwindow, and correlation ... 
Performance improvement of track initiation algorithms with the incorporation of doppler velocity measurement
(IEEE, 2006)In this study, to obtain the analytical expressions of false track initiation probability, elevation and Doppler velocity measurements extracted by a phased array radar are incorporated for the first time into the commonly ... 
Positioning algorithms for cooperative networks in the presence of an unknown turnaround time
(IEEE, 2011)This paper addresses the problem of single node positioning in cooperative network using hybrid twoway timeofarrival and timedifferenceofarrival where, the turnaround time at the target node is unknown. Considering ... 
Radius of curvature estimation and localization of targets using multiple sonar sensors
(A I P Publishing LLC, 199904)Acoustic sensors have been widely used in timeofflight ranging systems since they are inexpensive and convenient to use. One of the most important limitations of these sensors is their low angular resolution. To improve ...