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This page shows you the most recent publications within this specialty of the MedWorm directory. This is page number 20.

Tracking Using Motion Estimation With Physically Motivated Inter-Region Constraints
We propose a method for tracking structures (e.g., ventricles and myocardium) in cardiac images (e.g., magnetic resonance) by propagating forward in time a previous estimate of the structures using a new physically motivated motion estimation scheme. Our method estimates motion by regularizing only within structures so that differing motions among different structures are not mixed. It simultaneously satisfies the physical constraints at the interface between a fluid and a medium that the normal component of the fluid's motion must match the normal component of the medium's motion and the No-Slip condition, which states th...
Source: IEE Transactions on Medical Imaging - August 29, 2014 Category: Biomedical Engineering Source Type: research

Model-Based MR Parameter Mapping With Sparsity Constraints: Parameter Estimation and Performance Bounds
Magnetic resonance parameter mapping (e.g., $T_{1}$ mapping, $T_{2}$ mapping, $T^{ast }_{2}$ mapping) is a valuable tool for tissue characterization. However, its practical utility has been limited due to long data acquisition time. This paper addresses this problem with a new model-based parameter mapping method. The proposed method utilizes a formulation that integrates the explicit signal model with sparsity constraints on the model parameters, enabling direct estimation of the parameters of interest from highly undersampled, noisy $ {bf k}$-space data. An efficient greedy-pursuit algorithm is described to solve the res...
Source: IEE Transactions on Medical Imaging - August 29, 2014 Category: Biomedical Engineering Source Type: research

A Fourier-Based Approach to the Angiographic Assessment of Flow Diverter Efficacy in the Treatment of Cerebral Aneurysms
Flow diversion is an emerging endovascular treatment option for cerebral aneurysms. Quantitative assessment of hemodynamic changes induced by flow diversion can aid clinical decision making in the treatment of cerebral aneurysms. In this article, besides summarizing past key research efforts, we propose a novel metric for the angiographic assessment of flow diverter deployments in the treatment of cerebral aneurysms. By analyzing the frequency spectra of signals derived from digital subtraction angiography (DSA) series, the metric aims to quantify the prevalence of frequency components that correspond to the patient-specif...
Source: IEE Transactions on Medical Imaging - August 29, 2014 Category: Biomedical Engineering Source Type: research

Multiatlas Segmentation as Nonparametric Regression
We describe how to estimate these parameters and show that several human anatomical structures exhibit the trends modeled analytically. We use these parameter estimates to optimize the regression estimator. We show that the expected error for large database sizes is well predicted by models learned on small databases. Thus, a few expert segmentations can help predict the database sizes required to keep the expected error below a specified tolerance level. Such cost-benefit analysis is crucial for deploying clinical multiatlas segmentation systems. (Source: IEE Transactions on Medical Imaging)
Source: IEE Transactions on Medical Imaging - August 29, 2014 Category: Biomedical Engineering Source Type: research

Automatic Whole Brain MRI Segmentation of the Developing Neonatal Brain
In this study, we propose a framework for accurate intensity-based segmentation of the developing neonatal brain, from the early preterm period to term-equivalent age, into 50 brain regions. We present a novel segmentation algorithm that models the intensities across the whole brain by introducing a structural hierarchy and anatomical constraints. The proposed method is compared to standard atlas-based techniques and improves label overlaps with respect to manual reference segmentations. We demonstrate that the proposed technique achieves highly accurate results and is very robust across a wide range of gestational ages, f...
Source: IEE Transactions on Medical Imaging - August 29, 2014 Category: Biomedical Engineering Source Type: research

Hierarchical Lung Field Segmentation With Joint Shape and Appearance Sparse Learning
Lung field segmentation in the posterior–anterior (PA) chest radiograph is important for pulmonary disease diagnosis and hemodialysis treatment. Due to high shape variation and boundary ambiguity, accurate lung field segmentation from chest radiograph is still a challenging task. To tackle these challenges, we propose a joint shape and appearance sparse learning method for robust and accurate lung field segmentation. The main contributions of this paper are: 1) a robust shape initialization method is designed to achieve an initial shape that is close to the lung boundary under segmentation; 2) a set of local sparse ...
Source: IEE Transactions on Medical Imaging - August 29, 2014 Category: Biomedical Engineering Source Type: research

7T Transmit/Receive Arrays Using ICE Decoupling for Human Head MR Imaging
In this study, an eight-channel transmit/receive volume array with ICE-decoupled loop elements was built and investigated to demonstrate its feasibility and robustness for human head imaging at 7T. Isolation between adjacent loop elements was better than - 25 dB with a human head load. The worst-case of the isolation between all of the elements was about - 17.5 dB. All of the MRI experiments were performed on a 7T whole-body human MR scanner. Images of the phantom and human head were acquired and ${rm g}$-factor maps were measured and calculated to evaluate the performance of the coil array. Compared with the conventional ...
Source: IEE Transactions on Medical Imaging - August 29, 2014 Category: Biomedical Engineering Source Type: research

Table of Contents
(Source: IEE Transactions on Medical Imaging)
Source: IEE Transactions on Medical Imaging - August 29, 2014 Category: Biomedical Engineering Source Type: research

IEEE Transactions on Medical Imaging publication information
(Source: IEE Transactions on Medical Imaging)
Source: IEE Transactions on Medical Imaging - August 29, 2014 Category: Biomedical Engineering Source Type: research

Bio-insecticide Bacillus thuringiensis spores encapsulated with amaranth derivatized starches: studies on the propagation "in vitro"
The objective of this study was to develop and characterize native and modified amaranth starch granules and evaluate their potential application as wall materials in the microcapsulation of B thuringiensis serovar kurstaki HD-1 (Bt- HD1), produced by spray drying. Native amaranth starch granules were treated by hydrolyzation, high energy milling (HEM) and were chemically modified by phosphorylation and succinylation. The size of the Bt microcapsules varied from 12.99 to 17.14 μm adequate to protect the spores of Bt from ultraviolet radiation. The aw coefficient of the microcapsules produced by the modified starches afte...
Source: Bioprocess and Biosystems Engineering - August 29, 2014 Category: Biomedical Engineering Authors: Rodríguez AP, Martínez MG, Barrera-Cortés J, Ibarra JE, Bustos FM Tags: Bioprocess Biosyst Eng Source Type: research

Lamina replacement with titanium plate fixation improves spinal stability after total lumbar laminectomy.
Abstract Biomechanical experiments and strain analyses were performed to investigate the effects of lamina replacement surgery for intraspinal lesions on postoperative spinal stability. Eight specimens of thoracic and lumbar vertebrae (T12-L4) were collected from adult cadavers. Stepwise lumbar total laminectomy, and laminoplasty with lamina reduction and replacement was undertaken in combination with titanium-plate fixation to simulate the surgical setting. The effects of thoracic and lumbar vertebral strain, displacement, and rigidity on spinal stability were measured following both single and multiple segment la...
Source: Computer Methods in Biomechanics and Biomedical Engineering - August 29, 2014 Category: Biomedical Engineering Authors: Nong L, Zhou D, Xu N, Du R, Jiang X Tags: Comput Methods Biomech Biomed Engin Source Type: research

Initial Boost Release of Transforming Growth Factor-β3 and Chondrogenesis by Freeze-Dried Bioactive Polymer Scaffolds.
Abstract In cartilage regeneration, bio-activated implants are used in stem and progenitor cell-based microfracture cartilage repair procedures. Our aim was to analyze the chondrogenic potential of freeze-dried resorbable polymer-based polyglycolic acid (PGA) scaffolds bio-activated with transforming growth factor-β3 (TGFB3) on human subchondral mesenchymal progenitor cells known from microfracture. Progenitor cells derived from femur heads were cultured in the presence of freeze-dried TGFB3 in high-density pellet culture and in freeze-dried TGFB3-PGA scaffolds for chondrogenic differentiation. Progenitor cell cul...
Source: Annals of Biomedical Engineering - August 29, 2014 Category: Biomedical Engineering Authors: Krüger JP, Machens I, Lahner M, Endres M, Kaps C Tags: Ann Biomed Eng Source Type: research

Physiological Significance of Helical Flow in the Arterial System and its Potential Clinical Applications.
Abstract Helical flow in the human aorta is possibly a typical example of 'form follows function' in the vascular system. The helical blood flow may provide guaranties for the inner surface of the ascending aortic wall to get smooth and even washing by the blood so that atherosclerotic plaques can hardly form in the area of the ascending aorta. It has been documented that the phenomenon of helical flow of blood is not just localized in the ascending aorta, it also exists in several large arteries and veins as well. Preliminary studies demonstrated the widely existing helical flow might play positive physiological r...
Source: Annals of Biomedical Engineering - August 29, 2014 Category: Biomedical Engineering Authors: Liu X, Sun A, Fan Y, Deng X Tags: Ann Biomed Eng Source Type: research

Identification and monitoring of brain activity based on stochastic relevance analysis of short--time EEG rhythms
Conclusions: The proposed approach provides the reliable identification of traces of interictal/ictal states of epilepsy. The introduced relevance rhythm diagrams of physiological rhythms provides effective means of monitoring epileptic seizures; additionally, these diagrams are easily implement and provide simple clinical interpretation. The developed variability-based relevance analysis can betranslated to other monitoring applications involving time-variant biomedical data. (Source: BioMedical Engineering OnLine)
Source: BioMedical Engineering OnLine - August 28, 2014 Category: Biomedical Engineering Authors: Leonardo Duque MunozCesar Castellanos DomínguezJairo Espinosa Oviedo Source Type: research

A point-of-care testing system with Love-wave sensor and immunogold staining enhancement for early detection of lung cancer.
Abstract It has been reported that detection of exhaled breath condensate (EBC) is available for studies of pulmonary diseases, especially lung disease. In order to detect lung cancer (LC) at early stage, a point-of-care testing system suitable for measurement of tumor markers in EBC is developed. The assay, based on gold nanoparticle sandwich immunoassay and subsequent gold staining, was performed on a Love-wave sensor packaged inside a chip cartridge. Benefit from high sensitivity of Love-wave sensor, oriented immobilization of coating antibodies and immunogold staining enhancement, the present immunosensor could...
Source: Biomedical Microdevices - August 28, 2014 Category: Biomedical Engineering Authors: Zou Y, Zhang X, An C, Ran C, Ying K, Wang P Tags: Biomed Microdevices Source Type: research

Thermal, creep-recovery and viscoelastic behavior of high density polyethylene/ hydroxyapatite nano particles for bone substitutes: effects of gamma radiation
Conclusion: Based on the experimental results, it is found that prepared HDPE nanocomposite properties improved due to the addition of HA nanoparticles and irradiation. So, the prepared HDPE/HA nanocomposite appears to have fairly good comprehensive properties that make it a good candidate as bone substitute. (Source: BioMedical Engineering OnLine)
Source: BioMedical Engineering OnLine - August 28, 2014 Category: Biomedical Engineering Authors: Othman AlothmanH FouadS Al-ZahraniAyman EshraMohammed Al RezS Ansari Source Type: research

Reconstruction of Freehand 3D Ultrasound based on Kernel Regression
Conclusion: The proposed kernel regression based reconstruction method is capable of constructing volume datawith improved accuracy from irregularly sampled sparse data for freehand 3D ultrasound imagingsystem. (Source: BioMedical Engineering OnLine)
Source: BioMedical Engineering OnLine - August 28, 2014 Category: Biomedical Engineering Authors: Xiankang ChenTiexiang WenXingmin LiWenjian QinDonglai LanWeizhou PanJia Gu Source Type: research

Performance of on-site pilot static granular bed reactor (SGBR) for treating dairy processing wastewater and chemical oxygen demand balance modeling under different operational conditions.
Abstract The performance and operational stability of a pilot-scale static granular bed reactor (SGBR) for the treatment of dairy processing wastewater were investigated under a wide range of organic and hydraulic loading rates and temperature conditions. The SGBR achieved average chemical oxygen demand (COD), biological oxygen demand (BOD), and total suspended solids (TSS)-removal efficiencies higher than 90 % even at high loading rates up to 7.3 kg COD/m(3)/day, with an hydraulic retention time (HRT) of 9 h, and at low temperatures of 11 °C. The average methane yield of 0.26 L CH4/g CODremoved was possibly a...
Source: Bioprocess and Biosystems Engineering - August 28, 2014 Category: Biomedical Engineering Authors: Oh JH, Park J, Ellis TG Tags: Bioprocess Biosyst Eng Source Type: research

Thermal, creep-recovery and viscoelastic behavior of high density polyethylene/hydroxyapatite nano particles for bone substitutes: effects of gamma radiation
Conclusion: Based on the experimental results, it is found that prepared HDPE nanocomposite properties improved due to the addition of HA nanoparticles and irradiation. So, the prepared HDPE/HA nanocomposite appears to have fairly good comprehensive properties that make it a good candidate as bone substitute. (Source: BioMedical Engineering OnLine)
Source: BioMedical Engineering OnLine - August 28, 2014 Category: Biomedical Engineering Authors: Othman AlothmanH FouadS Al-ZahraniAyman EshraMohammed Al RezS Ansari Source Type: research

Structural and Mechanical Adaptations of Right Ventricle Free Wall Myocardium to Pressure Overload.
Abstract Right ventricular (RV) failure in response to pulmonary hypertension (PH) is a severe disease that remains poorly understood. PH-induced pressure overload leads to changes in the RV free wall (RVFW) that eventually results in RV failure. While the development of computational models can benefit our understanding of the onset and progression of PH-induced pressure overload, detailed knowledge of the underlying structural and biomechanical events remains limited. The goal of the present study was to elucidate the structural and biomechanical adaptations of RV myocardium subjected to sustained pressure overlo...
Source: Annals of Biomedical Engineering - August 28, 2014 Category: Biomedical Engineering Authors: Hill MR, Simon MA, Valdez-Jasso D, Zhang W, Champion HC, Sacks MS Tags: Ann Biomed Eng Source Type: research

A novel device for the clearance and prevention of blockages within biomedical catheters
Biomedical catheters are commonly used to move fluids from one part of the body to another, or remove them from the body completely. In some instances, these catheters become occluded due to blood or other debris. Such occlusions may prove fatal or require re-operation with enormous costs and effects on the health-care system and the individual. We developed a model of occlusion in both a ventriculo-peritoneal shut system and en external ventricular drain. Having demonstrated that occlusions can be reliably generated in a manner that resembles the clinical situation we show that vibration can clear the blockages. (Source: ...
Source: Medical Engineering and Physics - August 28, 2014 Category: Biomedical Engineering Authors: Richard Fox, Jonathan Norton Tags: Technical note Source Type: research

Rigid Body Localization Using Sensor Networks
A framework for joint position and orientation estimation of a rigid body using range measurements is proposed. We consider a setup in which a few sensors are mounted on a rigid body. The absolute position of the rigid body is not known. However, we know how the sensors are mounted on the rigid body, i.e., the sensor topology is known. The rigid body is localized using noisy range measurements between the sensors and a few anchors (nodes with known absolute positions), and without using any inertial measurements. We propose a least-squares (LS), and a number of constrained LS estimators, where the constrained estimators so...
Source: IEEE Transactions on Signal Processing - August 26, 2014 Category: Biomedical Engineering Source Type: research

Resource Optimization of Non-Additive Utility Functions in Localized SC-FDMA Systems
In this paper, we study the problem of resource allocation in SC-FDMA systems. A sum-utility maximization is considered where the utility of each user may be neither additive nor super additive. Unlike OFDMA, in addition to the restriction of allocating a subchannel to at most one user, the multiple subchannels allocated to a user in SC-FDMA must be consecutive. This makes the resource allocation problem prohibitively difficult and challenging. We provide a fundamental complexity analysis of the optimization problem for general non-additive utility functions and show that not only the problem is NP-hard but also approximat...
Source: IEEE Transactions on Signal Processing - August 26, 2014 Category: Biomedical Engineering Source Type: research

Table of contents
Presents the table of contents for this issue of the periodical. (Source: IEEE Transactions on Signal Processing)
Source: IEEE Transactions on Signal Processing - August 26, 2014 Category: Biomedical Engineering Source Type: research

Book review of "Methods in Research and Development of Biomedical Devices" edited by Kelvin K L Wong, Jiyuan Tu, Zhonghua Sun and Don W Dissanayake
This article is a review of the book "Methods in Research and Development of Biomedical Devices" (ISBN: 9789814434997, 98USD/65GBP, 177 pages) edited by Kelvin K L Wong, Jiyuan Tu, Zhonghua Sun and Don W Dissanayake published by the World Scientific Publishing Co. Pte. Ltd. in 2013. The content of the book and its importance for biomedical engineering have been discussed in this invited review. (Source: BioMedical Engineering OnLine)
Source: BioMedical Engineering OnLine - August 26, 2014 Category: Biomedical Engineering Authors: Robert Koprowski Source Type: research

Accuracy assessment of Tri-plane B-mode ultrasound for non-invasive 3D kinematic analysis of knee joints
Conclusion: In this paper, we have presented a novel non-invasive approach to measuring the motion of the bones in a knee using tri-plane B-mode ultrasound and image registration. In our study, the image registration method determines the position of bony landmarks relative to a B-mode ultrasound sensor array with sub-pixel accuracy. The advantages of our proposed system over previous techniques are that it is non-invasive, does not require the use of ionizing radiation and can be used conveniently if miniaturized. (Source: BioMedical Engineering OnLine)
Source: BioMedical Engineering OnLine - August 26, 2014 Category: Biomedical Engineering Authors: Md MasumMark PickeringAndrew LambertJennie ScarvellPaul Smith Source Type: research

Book review of ¿Methods in Research and Development of Biomedical Devices¿ edited by Kelvin K L Wong, Jiyuan Tu, Zhonghua Sun and Don W Dissanayake
This article is a review of the book “Methods in Research and Development of Biomedical Devices” (ISBN: 9789814434997, 98USD/65GBP, 177 pages) edited by Kelvin K L Wong, Jiyuan Tu, Zhonghua Sun and Don W Dissanayake published by the World Scientific Publishing Co. Pte. Ltd. in 2013. The content of the book and its importance for biomedical engineering have been discussed in this invited review. (Source: BioMedical Engineering OnLine)
Source: BioMedical Engineering OnLine - August 26, 2014 Category: Biomedical Engineering Authors: Robert Koprowski Source Type: research

Is the callus shape an optimal response to a mechanobiological stimulus?
When a fracture occurs, bone tissue is disrupted and mechanical stability is impaired [1]. To restore bone tissue continuity and bone mechanical function, secondary bone healing takes place. Secondary bone healing is a four-stage process [2]. Initially, inflammation occurs [2–4], and a soft callus gradually appears. The callus serves as a splint, reducing interfragmentary strain and increasing stability. As stability increases, bone tissue advances next to cortical bone by intramembranous ossification and into the soft callus through endochondral ossification, utterly creating a hard, bony callus. (Source: Medical Engineering and Physics)
Source: Medical Engineering and Physics - August 26, 2014 Category: Biomedical Engineering Authors: Frederico O. Ribeiro, João Folgado, José Manuel Garcia-Aznar, María José Gómez-Benito, Paulo R. Fernandes Tags: Technical note Source Type: research

Pulse pressure waveform estimation using distension profiling with contactless optical probe
The profile of the arterial pressure pulse shows the result of the ventricular blood ejection over the arterial system, modulated by its mechanical properties. The load on the ventricle during ejection can be described by the systolic blood pressure. The arterial pressure wave travels from the central aorta to the peripheral arteries and several changes occur. The pulse pressure wave progressively steepens and increases in amplitude, while it loses the sharpness of the dicrotic notch [1]. (Source: Medical Engineering and Physics)
Source: Medical Engineering and Physics - August 26, 2014 Category: Biomedical Engineering Authors: Tânia Pereira, Inês Santos, Tatiana Oliveira, Pedro Vaz, Telmo Pereira, Helder Santos, Helena Pereira, Carlos Correia, João Cardoso Tags: Technical note Source Type: research

Intraluminal magnetisation of bowel by ferromagnetic particles for retraction and manipulation by magnetic probes
Feasibility studies are needed to demonstrate that safe and effective manipulation of bowel during Minimal Access Surgery (MAS) can be obtained by use of magnetic force. This paper characterises two classes of magnetic particles: stainless steel microparticles (SS-μPs) and iron oxide nanoparticles (IO-nPs) in terms of their magnetisation, chemical composition, crystallinity, morphology and size distribution. Both magnetic particles were dispersed in a high viscosity biological liquid for intraluminal injection of bowel. (Source: Medical Engineering and Physics)
Source: Medical Engineering and Physics - August 26, 2014 Category: Biomedical Engineering Authors: Z. Wang, P. André, D. McLean, S.I. Brown, G.J. Florence, A. Cuschieri Tags: Technical note Source Type: research

Low-Sampling-Rate Ultra-Wideband Channel Estimation Using Equivalent-Time Sampling
In this paper, a low-sampling-rate scheme for ultra-wideband channel estimation is proposed. The scheme exploits multiple observations generated by transmitting multiple pulses. In the proposed scheme, $P$ pulses are transmitted to produce channel impulse response estimates at a desired sampling rate, while the ADC samples at a rate that is $P$ times slower. To avoid loss of fidelity, the number of sampling periods (based on the desired rate) in the inter-pulse interval is restricted to be co-prime with $P$ . This condition is affected when clock drift is present and the transmitted pulse locations change. To handle this c...
Source: IEEE Transactions on Signal Processing - August 22, 2014 Category: Biomedical Engineering Source Type: research

Alternating Projections and Douglas-Rachford for Sparse Affine Feasibility
The problem of finding a vector with the fewest nonzero elements that satisfies an underdetermined system of linear equations is an NP-complete problem that is typically solved numerically via convex heuristics or nicely-behaved nonconvex relaxations. In this work we consider elementary methods based on projections for solving a sparse feasibility problem without employing convex heuristics. It has been shown recently that, locally, the fundamental method of alternating projections must converge linearly to a solution to the sparse feasibility problem with an affine constraint. In this paper we apply different analytical t...
Source: IEEE Transactions on Signal Processing - August 22, 2014 Category: Biomedical Engineering Source Type: research

Superoscillations With Optimum Energy Concentration
Oscillations of a bandlimited signal at a rate faster than the bandlimit are called “superoscillations” and have applications e.g. in superresolution and superdirectivity. The synthesis of superoscillating signals is a numerically difficult problem. Minimum energy superoscillatory signals seem attractive for applications because (i) the minimum-energy solution is unique (ii) it has the smallest energy cost (iii) it may yield a signal of the smallest possible amplitude. On the negative side, superoscillating functions of minimum-energy depend heavily on cancellation and give rise to expressions that have very ...
Source: IEEE Transactions on Signal Processing - August 22, 2014 Category: Biomedical Engineering Source Type: research

${cal H}_2$ Sampled—Data Filtering of Linear Systems
This paper addresses the ${cal H}_2$ state estimation problem in the context of sampled-data systems, which is closely related to ${cal H}_2$ filtering design under limited bandwidth constraints. Our first approach considers a fixed data-rate setting, for which a discrete-time equivalent system is devised and, based on this concept, sufficient conditions for the ${cal H}_2$ filtering design are yielded. These results are then generalized to obtain a robust filter that is able to cope with uneven data-rates. Academical examples illustrate the theoretical results and point out the main characteristics of the design technique...
Source: IEEE Transactions on Signal Processing - August 22, 2014 Category: Biomedical Engineering Source Type: research

Convex Optimization Approaches for Blind Sensor Calibration Using Sparsity
We investigate a compressive sensing framework in which the sensors introduce a distortion to the measurements in the form of unknown gains. We focus on blind calibration, using measures performed on multiple unknown (but sparse) signals and formulate the joint recovery of the gains and the sparse signals as a convex optimization problem. We divide this problem in 3 subproblems with different conditions on the gains, specifially i) gains with different amplitude and the same phase, ii) gains with the same amplitude and different phase and iii) gains with different amplitude and phase. In order to solve the first case, we p...
Source: IEEE Transactions on Signal Processing - August 22, 2014 Category: Biomedical Engineering Source Type: research

$R$ -Dimensional ESPRIT-Type Algorithms for Strictly Second-Order Non-Circular Sources and Their Performance Analysis
High-resolution parameter estimation algorithms designed to exploit the prior knowledge about incident signals from strictly second-order (SO) noncircular (NC) sources allow for a lower estimation error and can resolve twice as many sources. In this paper, we derive the $R$ ${mathchar"702D}{rm D}$ NC Standard ESPRIT and the $R$ ${mathchar"702D}{rm D}$ NC Unitary ESPRIT algorithms that provide a significantly better performance compared to their original versions for arbitrary source signals. They are applicable to shift-invariant $R$ ${mathchar"702D}{rm D}$ antenna arrays and do not require a centro-symmetric array structu...
Source: IEEE Transactions on Signal Processing - August 22, 2014 Category: Biomedical Engineering Source Type: research

Theory, Design and Application of Arbitrary Order Arbitrary Delay Filterbanks
Classical design of filterbanks results in equal order inverses, thus resulting in filterbanks with equal analysis and synthesis filter length. While it is known that filterbanks may have unequal orders, there does not exist a simple, systematic method to design a $p$th-order analysis and $q$th-order synthesis filterbank where $p ne q$. Also, the design criteria of the $p$ th-order analysis having $q$ th-order synthesis filters ($p ne q$) with a flexibility to control the system delay has never been addressed concomitantly. In this work, we propose the use of unit non-diagonal matrix polynomials to design such filterbanks ...
Source: IEEE Transactions on Signal Processing - August 22, 2014 Category: Biomedical Engineering Source Type: research

Multiuser MISO Beamforming for Simultaneous Wireless Information and Power Transfer
This paper studies a multiuser multiple-input single-output (MISO) broadcast simultaneous wireless information and power transfer (SWIPT) system, where a multi-antenna access point (AP) sends wireless information and energy simultaneously via spatial multiplexing to multiple single-antenna receivers each of which implements information decoding (ID) or energy harvesting (EH). We aim to maximize the weighted sum-power transferred to all EH receivers subject to given minimum signal-to-interference-and-noise ratio (SINR) constraints at different ID receivers. In particular, we consider two types of ID receivers (referred to a...
Source: IEEE Transactions on Signal Processing - August 22, 2014 Category: Biomedical Engineering Source Type: research