Biomedical Engineering Research 
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This page shows you the most recent publications within this specialty of the MedWorm directory. This is page number 11.
Getting Your Research Out There: Open Access & More.
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Getting Your Research Out There: Open Access & More.
Ann Biomed Eng. 2012 Sep 7;
Authors: Setton LA, Yin FC, Margulies SS, Sakiyama-Elbert SE, Beizer D
PMID: 22956162 [PubMed - as supplied by publisher]
Source: Annals of Biomedical Engineering - September 7, 2012 Category: Biomedical Engineering Authors: Setton LA, Yin FC, Margulies SS, Sakiyama-Elbert SE, Beizer D Tags: Ann Biomed Eng Source Type: research
Spatiotemporal Mechanical Variation Reveals Critical Role for Rho Kinase During Primitive Streak Morphogenesis.Email this article to a colleague.
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Abstract
Large-scale morphogenetic movements during early embryo development are driven by complex changes in biochemical and biophysical factors. Current models for amniote primitive streak morphogenesis and gastrulation take into account numerous genetic pathways but largely ignore the role of mechanical forces. Here, we used atomic force microscopy (AFM) to obtain for the first time precise biomechanical properties of the early avian embryo. Our data reveal that the primitive streak is significantly stiffer than neighboring regions of the epiblast, and that it is stiffer than the pre-primitive streak epiblast. T...
Source: Annals of Biomedical Engineering - September 7, 2012 Category: Biomedical Engineering Authors: Henkels J, Oh J, Xu W, Owen D, Sulchek T, Zamir E Tags: Ann Biomed Eng Source Type: research
Gait Variability is Altered in Older Adults When Listening to Auditory Stimuli with Differing Temporal Structures.Email this article to a colleague.
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Abstract
Gait variability in the context of a deterministic dynamical system may be quantified using nonlinear time series analyses that characterize the complexity of the system. Pathological gait exhibits altered gait variability. It can be either too periodic and predictable, or too random and disordered, as is the case with aging. While gait therapies often focus on restoration of linear measures such as gait speed or stride length, we propose that the goal of gait therapy should be to restore optimal gait variability, which exhibits chaotic fluctuations and is the balance between predictability and complexity....
Source: Annals of Biomedical Engineering - September 7, 2012 Category: Biomedical Engineering Authors: Kaipust JP, McGrath D, Mukherjee M, Stergiou N Tags: Ann Biomed Eng Source Type: research
Insect biofuel cells using trehalose included in insect hemolymph leading to an insect-mountable biofuel cell.Email this article to a colleague.
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Abstract
In this paper, an insect biofuel cell (BFC) using trehalose included in insect hemolymph was developed. The insect BFC is based on trehalase and glucose oxidase (GOD) reaction systems which oxidize β-glucose obtained by hydrolyzing trehalose. First, we confirmed by LC-MS that a sufficient amount of trehalose was present in the cockroach hemolymph (CHL). The maximum power density obtained using the insect BFC was 6.07 μW/cm(2). The power output was kept more than 10 % for 2.5 h by protecting the electrodes with a dialysis membrane. Furthermore, the maximum power density was increased to 10.5 μW/cm(2)...
Source: Biomedical Microdevices - September 7, 2012 Category: Biomedical Engineering Authors: Shoji K, Akiyama Y, Suzuki M, Hoshino T, Nakamura N, Ohno H, Morishima K Tags: Biomed Microdevices Source Type: research
Simultaneous monitoring of static and dynamic intracranial pressure parameters from two separate sensors in patients with cerebral bleeds: comparison of findingsEmail this article to a colleague.
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Conclusions:
Simultaneous monitoring of ICP using two solid sensors may show marked differences in static ICP but close to identity in dynamic ICP waveforms. This indicates that shifts in ICP baseline pressure (sensor zero level) occur clinically; trend plots of the ICP parameters also confirm this. Solid sensors are superior to fluid - and air pouch sensors when evaluating the dynamic ICP parameters.
Source: BioMedical Engineering OnLine - September 7, 2012 Category: Biomedical Engineering Authors: Per Kristian EideSverre HolmWilhelm Sorteberg Source Type: research
AD 1 Networks in the brainEmail this article to a colleague.
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Marcus E Raichle, a neurologist, is a Professor of Radiology, Neurology, Neurobiology and Biomedical Engineering at Washington University in St Louis. He is a member of the National Academy of Sciences, The Institute of Medicine and the American Academy of Arts and Sciences and a Fellow of the American Association for the Advancement of Science. He and his colleagues have made outstanding contributions to the study of human brain function through the development and use of positron emission tomography (PET) and functional MRI (fMRI). Their landmark study (Nature, 1988) described the first integrated strategy for the design...
Source: Journal of Neurology, Neurosurgery and Psychiatry - September 7, 2012 Category: Neurosurgery Authors: Raichle, M. E. Tags: Neuroimaging, Radiology, Radiology (diagnostics) BNPA 2012 AGM Source Type: research
Surface immobilization of protein via biosilification catalyzed by silicatein fused to glutathione S-transferase (GST).Email this article to a colleague.
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In this study, we employed GST-glutathione (GSH) interaction system to increase the production of silicatein and develop an efficient protein immobilization method. Recombinant silicatein fused with GST (GST-SIL) was produced in E. coli and the GST-SIL protein was employed on GSH-coated glass plate. GST-SIL bound surface or matrix can catalyze the formation of silica layer in the presence of tetraethyl orthosilicate as a substrate at an ambient temperature and neutral pH. During silicatein-mediated silicification, green fluorescent protein (GFP) or horseradish peroxidase (HRP) can be efficiently immobilized on the silica s...
Source: Bioprocess and Biosystems Engineering - September 6, 2012 Category: Biomedical Engineering Authors: Ki MR, Yeo KB, Pack SP Tags: Bioprocess Biosyst Eng Source Type: research
BBB ON CHIP: microfluidic platform to mechanically and biochemically modulate blood-brain barrier function.Email this article to a colleague.
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We present here the smallest model of the BBB yet, using a microfluidic chip, and the immortalized human brain endothelial cell line hCMEC/D3. Barrier function is modulated both mechanically, by exposure to fluid shear stress, and biochemically, by stimulation with tumor necrosis factor alpha (TNF-α), in one single device. The device has integrated electrodes to analyze barrier tightness by measuring the transendothelial electrical resistance (TEER). We demonstrate that hCMEC/D3 cells could be cultured in the microfluidic device up to 7 days, and that these cultures showed comparable TEER values with the well-established...
Source: Biomedical Microdevices - September 6, 2012 Category: Biomedical Engineering Authors: Griep LM, Wolbers F, de Wagenaar B, Ter Braak PM, Weksler BB, Romero IA, Couraud PO, Vermes I, van der Meer AD, van den Berg A Tags: Biomed Microdevices Source Type: research
An ATP sensitive light addressable biosensor for extracellular monitoring of single taste receptor cell.Email this article to a colleague.
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In this study, we presented an aptamer-based biosensor for the detection of ATP locally secreted from single TRC. ATP sensitive DNA aptamer was used as recognition element and its DNA competitor was served as signal transduction element that was covalently immobilized on the surface of light addressable potentiometric sensor (LAPS). Due to the light addressable capability of LAPS, local ATP secretion from single TRC can be detected by monitoring the working potential shifts of LAPS. The results show this biosensor can detect ATP with high sensitivity and specificity. It is demonstrated this biosensor can effectively detect...
Source: Biomedical Microdevices - September 6, 2012 Category: Biomedical Engineering Authors: Wu C, Du L, Zou L, Zhao L, Wang P Tags: Biomed Microdevices Source Type: research
An isobutyronitrile-induced bienzymatic system of Alcaligenes sp. MTCC 10674 and its application in the synthesis of α-hydroxyisobutyric acid.Email this article to a colleague.
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Abstract
Alcaligenes sp. MTCC 10674 was isolated as acetone cyanohydrin hydrolyzing bacterium from soil of orchid gardens of Himachal Pradesh. Acetone cyanohydrin hydrolyzing activity of this organism comprised nitrile hydratase and amidase activities. It exhibited higher substrate specificity towards aliphatic hydroxynitrile (acetone cyanohydrin) in comparison to arylaliphatic hydroxynitrile. Isobutyronitrile (40 mM) acted as a carbon source as well as inducer for growth of Alcaligenes sp. MTCC 10674 and expression of acetone cyanohydrin hydrolyzing activity. Optimization of culture condition using response surfa...
Source: Bioprocess and Biosystems Engineering - September 5, 2012 Category: Biomedical Engineering Authors: Bhatia SK, Mehta PK, Bhatia RK, Bhalla TC Tags: Bioprocess Biosyst Eng Source Type: research
Morphology analysis of vertebral trabecular bone under dynamic loading based on multi-scale theoryEmail this article to a colleague.
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Abstract Trabecular bone has a complicated porous microstructure and consists of interconnected plates and rods known as trabeculae.
The microarchitecture of the trabeculae contributes to load distribution capacity and, particularly, the optimal bone strength.
Many previous studies have shown that morphological parameters are used to characterize the microarchitecture of trabecular
bone, but little is known about the mechanical role of trabecular morphology in the context of load-bearing behavior. Therefore,
this study proposes a new segmentation method for examining the morphology of trabecular structure fo...
Source: Medical and Biological Engineering and Computing - September 4, 2012 Category: Biomedical Engineering Tags: Medical and Biological Engineering and Computing Source Type: research
Pullulan fermentation using a prototype rotational reciprocating plate impeller.Email this article to a colleague.
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Abstract
A rotational reciprocating plate impeller prototype, designed to improve the mixing homogeneity of viscous non-Newtonian fermentation broth, has been tested in pullulan fermentations. With this new impeller, the operating levels of several factors were investigated to improve pullulan production with Aureobasidium pullulans ATCC 42023 in a 22-L bioreactor using experimental designs. Because both high molecular weight (MW) and high concentration of pullulan were desired; the exopolysaccharide (EPS) concentration and the broth viscosity were used as optimization objective functions to be maximized. A 6-run u...
Source: Bioprocess and Biosystems Engineering - September 4, 2012 Category: Biomedical Engineering Authors: Lin Y, Thibault J Tags: Bioprocess Biosyst Eng Source Type: research
Rapidly-moving insect muscle-powered microrobot and its chemical acceleration.Email this article to a colleague.
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We describe an insect muscle-powered autonomous microrobot (iPAM) and its acceleration with a neuroactive chemical, crustacean cardioactive peptide (CCAP). The iPAM, consisting of a DV tissue and a frame, was designed on the basis of a finite element method simulation and fabricated. The iPAM moved autonomously by spontaneous contraction of the DV tissue at a significantly improved velocity compared to our previous model. The best-case iPAM moved faster than other reported microrobots powered by mammalian cardiomycytes. It moved forward with a small declination of 0.54 ° during one contraction since the DV tissue not only...
Source: Biomedical Microdevices - September 4, 2012 Category: Biomedical Engineering Authors: Akiyama Y, Odaira K, Sakiyama K, Hoshino T, Iwabuchi K, Morishima K Tags: Biomed Microdevices Source Type: research
Ventilation distribution in rats: Part I - The effect of gas composition as measured with electrical impedance tomographyEmail this article to a colleague.
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Conclusion:
It was shown that gas density did not impact on convection dependent ventilation distribution in rats measured with EIT.
Source: BioMedical Engineering OnLine - September 4, 2012 Category: Biomedical Engineering Authors: Kimble DunsterMarlies FrieseJohn FraserGary CowinAndreas Schibler Source Type: research
Analysis of carotid artery deformation in different head and neck positions for maxillofacial catheter navigation in advanced oral cancer treatmentEmail this article to a colleague.
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Conclusions:
CA deformation was objectively proven as an important factor contributing to errors in maxillofacial navigation. Our study results suggest that small movements of the bones around CA can result in small CA deformations. Although patients' faces were not fixed properly during CT scanning, C1--C4 and vA--vE displacements were similar in individual patients. We proposed a novel method for accumulation of the displacement data, and this study indicated the importance of surrounding bone displacements in predicting CA bifurcation.
Source: BioMedical Engineering OnLine - September 4, 2012 Category: Biomedical Engineering Authors: Takashi OhyaToshinori IwaiKuan LuanTakashi KatoHongen LiaoEtsuko KobayashiKenji MitsudoNobukazu FuwaRyuji KohnoIchiro SakumaIwai Tohnai Source Type: research
Dynamic measurement of pennation angle of gastrocnemius muscles during contractions based on ultrasound imagingEmail this article to a colleague.
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Conclusions:
With the proposed methods, ultrasound measurement for muscle pennation angles can be more widely used for functional assessment of muscles.
Source: BioMedical Engineering OnLine - September 3, 2012 Category: Biomedical Engineering Authors: Yongjin ZhouJizhou LiGuangquan ZhouYongping Zheng Source Type: research
Increased shear stress inhibits angiogenesis in veins and not arteries during vascular developmentEmail this article to a colleague.
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Abstract Vascular development is believed to occur first by vasculogenesis followed by angiogenesis. Though angiogenesis is the formation
of new vessels, we found that vascular density actually decreases during this second stage. The onset of the decrease coincided
with the entry of erythroblasts into circulation. We therefore measured the level of shear stress at various developmental
stages and found that it was inversely proportional to vascular density. To investigate whether shear stress was inhibitory
to angiogenesis, we altered shear stress levels either by preventing erythroblasts from entering circu...
Source: Angiogenesis - September 2, 2012 Category: Molecular Biology Tags: Angiogenesis Source Type: research
Editorial: biomedical engineering imaging.Email this article to a colleague.
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PMID: 23020165 [PubMed - in process]
Source: Current Pharmaceutical Biotechnology - September 1, 2012 Category: Biotechnology Authors: Hourigan K Tags: Curr Pharm Biotechnol Source Type: research
Erratum to “Fast Higher-Order MR Image Reconstruction Using Singular-Vector Separation” [Jul 12 1396-1403]Email this article to a colleague.
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In the above titled paper (ibid., vol. 31, no. 7, pp. 1396-1403, July 2012), there were errors in equations (7a) and (7b). The corrected equations are presented here.
Source: IEE Transactions on Medical Imaging - September 1, 2012 Category: Biomedical Engineering Source Type: research
Image Reconstruction From Highly Undersampled -Space Data With Joint Partial Separability and Sparsity ConstraintsEmail this article to a colleague.
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Partial separability (PS) and sparsity have been previously used to enable reconstruction of dynamic images from undersampled $( {bf k},t)$-space data. This paper presents a new method to use PS and sparsity constraints jointly for enhanced performance in this context. The proposed method combines the complementary advantages of PS and sparsity constraints using a unified formulation, achieving significantly better reconstruction performance than using either of these constraints individually. A globally convergent computational algorithm is described to efficiently solve the underlying optimization problem. Reconstruction...
Source: IEE Transactions on Medical Imaging - September 1, 2012 Category: Biomedical Engineering Source Type: research
Tracing carbon monoxide uptake by Clostridium ljungdahlii during ethanol fermentation using (13)C-enrichment technique.Email this article to a colleague.
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Abstract
Conversion of synthesis gas (CO and H(2)) to ethanol can be an alternative, promising technology to produce biofuels from renewable biomass. To distinguish microbial utilization of carbon source between fructose and synthesis gas CO and to evaluate biological production of ethanol from CO, we adopted the (13)C-enrichment of the CO substrate and hypothesized that the residual increase in δ(13)C of the cell biomass would reflect the increased contribution of (13)C-enriched CO. Addition of synthesis gas to live culture medium for ethanol fermentation by Clostridum ljungdahlii increased the microbial growth a...
Source: Bioprocess and Biosystems Engineering - September 1, 2012 Category: Biomedical Engineering Authors: Yun SI, Gang SJ, Ro HM, Lee MJ, Choi WJ, Hong SG, Kang KK Tags: Bioprocess Biosyst Eng Source Type: research
IEEE Signal Processing Society InformationEmail this article to a colleague.
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"Provides a listing of current staff, committee members and society officers."
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
Renew your IEEE membership for 2012 and add Signal Processing SocietyEmail this article to a colleague.
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Advertisement: Renew your IEEE membership for 2012 and add Signal Processing Society.
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
IEEE Transactions on Signal Processing information for authorsEmail this article to a colleague.
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Provides instructions and guidelines to prospective authors who wish to submit manuscripts.
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
IEEE Transactions on Signal Processing EDICSEmail this article to a colleague.
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Editors' information classification scheme.
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
A Distributed Differential Space-Time Coding Scheme With Analog Network Coding in Two-Way Relay NetworksEmail this article to a colleague.
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In this correspondence, we consider general two-way relay networks (TWRNs) with two source and N relay nodes. A distributed differential space time coding with analog network coding (DDSTC-ANC) scheme is proposed. A simple blind estimation and a differential signal detector are developed to recover the desired signal at each source. The pairwise error probability (PEP) and block error rate (BLER) of the DDSTC-ANC scheme are analyzed. Exact and simplified PEP expressions are derived. To improve the system performance, the optimum power allocation (OPA) between the source and relay nodes is determined based on the simplified...
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
On the SCALE Algorithm for Multiuser Multicarrier Power Spectrum ManagementEmail this article to a colleague.
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This correspondence studies the successive convex approximation for low complexity (SCALE) algorithm, which was proposed to address the weighted sum rate (WSR) maximized dynamic power spectrum management (DSM) problem for multiuser multicarrier systems. To this end, we first revisit the algorithm, and then present geometric interpretation and properties of the algorithm. A geometric programming (GP) implementation approach is proposed and compared with the low-complexity approach proposed previously. In particular, an analytical method is proposed to set up the default lower-bound constraints added by a GP solver. Finally,...
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
Optimal Training Design for Individual Channel Estimation in Two-Way Relay NetworksEmail this article to a colleague.
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This correspondence considers the optimal training design in a classical three-node amplify-and-forward two-way relay network (TWRN) that targets at estimating the individual channel between each source node and the relay node. The transmission environment is assumed to be frequency selective and the orthogonal-frequency-division multiplexing (OFDM) modulation is adopted. We derive the Bayesian Cramér-Rao bound (CRB) for the individual channel estimation, from which the optimal training is obtained. Extensive numerical results are provided to corroborate the proposed studies.
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
Beampattern Synthesis With Blind Interference SuppressionEmail this article to a colleague.
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We suggest an adaptive blind interference suppression (BIS) beamformer that synthesizes a desired beampattern. For a strong interference, the principal eigenvector of the data sample covariance matrix approaches the array response at the interference direction. The beamformer weight vector minimizes the distance from a desired beampattern subject to a zero response to this principal eigenvector. For a strong interference, uncorrelated with the desired signal, the asymptotic array gain (AG) of the BIS beamformer achieves the AG of the minimum power distortionless response (MPDR) beamformer. Simulations demonstrate that, for...
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
Incremental Reformulated Automatic Relevance DeterminationEmail this article to a colleague.
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In this work, the relationship between the incremental version of sparse Bayesian learning (SBL) with automatic relevance determination (ARD)-a fast marginal likelihood maximization (FMLM) algorithm-and a recently proposed reformulated ARD scheme is established. The FMLM algorithm is an incremental approach to SBL with ARD, where the corresponding objective function-the marginal likelihood-is optimized with respect to the parameters of a single component provided that the other parameters are fixed; the corresponding maximizer is computed in closed form, which enables a very efficient SBL realization. Wipf and Nagarajan ha...
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
On the Recovery Limit of Sparse Signals Using Orthogonal Matching PursuitEmail this article to a colleague.
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Orthogonal matching pursuit (OMP) is a greedy search algorithm popularly being used for the recovery of compressive sensed sparse signals. In this correspondence, we show that if the isometry constant δK+1 of the sensing matrix Φ satisfies δK+1 <; 1/(1/√K+1) then the OMP algorithm can perfectly recover K-sparse signals from the compressed measurements y=Φx. Our bound offers a substantial improvement over the recent result of Davenport and Wakin and also closes gap between the recovery bound and fundamental limit over which the perfect recovery of the OMP cannot be guaranteed.
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
Dynamic Iterative PursuitEmail this article to a colleague.
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For compressive sensing of dynamic sparse signals, we develop an iterative pursuit algorithm. A dynamic sparse signal process is characterized by varying sparsity patterns over time/space. For such signals, the developed algorithm is able to incorporate sequential predictions, thereby providing better compressive sensing recovery performance, but not at the cost of high complexity. Through experimental evaluations, we observe that the new algorithm exhibits a graceful degradation at deteriorating signal conditions while capable of yielding substantial performance gains as conditions improve.
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
The Augmented Complex Kernel LMSEmail this article to a colleague.
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Recently, a unified framework for adaptive kernel based signal processing of complex data was presented by the authors, which, besides offering techniques to map the input data to complex reproducing kernel Hilbert spaces, developed a suitable Wirtinger-like calculus for general Hilbert spaces. In this short paper, the extended Wirtinger's calculus is adopted to derive complex kernel-based widely linear estimation filters suitable for applications involving noncircular data. Furthermore, we illuminate several important characteristics of the widely linear filters. We show that, although in many cases the gains from adoptin...
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
On the Proper Forms of BIC for Model Order SelectionEmail this article to a colleague.
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The Bayesian Information Criterion (BIC) is often presented in a form that is only valid in large samples and under a certain condition on the rate at which the Fisher Information Matrix (FIM) increases with the sample length. This form has been improperly used previously in situations in which the conditions mentioned above do not hold. In this correspondence, we describe the proper forms of BIC in several practically relevant cases that do not satisfy the above assumptions. In particular, we present a new form of BIC for high signal-to-noise ratio (SNR) cases. The conclusion of this study is that BIC remains one of the m...
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
Optimal Stochastic Parameter Design for Estimation ProblemsEmail this article to a colleague.
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In this study, the aim is to perform optimal stochastic parameter design in order to minimize the cost of a given estimator. Optimal probability distributions of signals corresponding to different parameters are obtained in the presence and absence of an average power constraint. It is shown that the optimal parameter design results in either a deterministic signal or a randomization between two different signal levels. In addition, sufficient conditions are obtained to specify the cases in which improvements over the deterministic parameter design can or cannot be achieved via the stochastic parameter design. Numerical ex...
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
Exact Performance Analysis of an Adaptive Subspace DetectorEmail this article to a colleague.
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The adaptive subspace detector (ASD), which is developed to handle detection problems in partially homogeneous environments where test and training data samples share the same noise covariance matrix up to an unknown scaling factor, has been evaluated in terms of probabilities of false alarm and detection. However, the probability of false alarm of the ASD is provided in an integral form. Moreover, the detection probability of the ASD is approximate in certain cases. In this correspondence, a finite-sum expression for the probability of false alarm of the ASD is obtained, and an exact expression for the detection probabili...
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
Optimal Intervention Strategies for Therapeutic Methods With Fixed-Length Duration of Drug EffectivenessEmail this article to a colleague.
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Intervention in gene regulatory networks in the context of Markov decision processes has usually involved finding an optimal one-transition policy, where a decision is made at every transition whether or not to apply treatment. In an effort to model dosing constraint, a cyclic approach to intervention has previously been proposed in which there is a sequence of treatment windows and treatment is allowed only at the beginning of each window. This protocol ignores two practical aspects of therapy. First, a treatment typically has some duration of action: a drug will be effective for some period, after which there can be a re...
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
Optimal Wireless Networks Based on Local Channel State InformationEmail this article to a colleague.
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This paper considers distributed algorithms to optimize random access multihop wireless networks in the presence of fading. Since the associated optimization problem is neither convex nor amenable to distributed implementation, a problem approximation is introduced. This approximation is still not convex but it has zero duality gap and can be solved and decomposed into local subproblems in the dual domain. The solution method is through a stochastic subgradient descent algorithm that operates without knowledge of the fading's probability distribution and leads to an architecture composed of layers and layer interfaces. Wit...
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
Modeling Information Flows in Distributed Sensor Networks: Chernoff Information Azimuth SpectrumEmail this article to a colleague.
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Consider a distributed sensor network (DSN) with randomly deployed sensors for binary detection of a phenomenon of interest (PoI). A fusion center (which may be a sensor itself) monitors the PoI using both the directly acquired PoI data and the wireless communication signals conveying binary decisions about the PoI from other distributed sensors. To address this problem, we first look into a PoI with specified statistics and present the modeling paradigm of Chernoff information azimuth spectrum (CIAS) to provide a compact, space-domain representation of asymptotic error exponents in DSNs. The CIAS is not only a function of...
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
Fusing Dependent Decisions for Hypothesis Testing With Heterogeneous SensorsEmail this article to a colleague.
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In this paper, we consider a binary decentralized detection problem where the local sensor observations are quantized before their transmission to the fusion center. Sensor observations, and hence their quantized versions, may be heterogeneous as well as statistically dependent. A composite binary hypothesis testing problem is formulated, and a copula-based generalized likelihood ratio test (GLRT) based fusion rule is derived given that the local sensors are uniform multilevel quantizers. An alternative computationally efficient fusion rule is also designed which involves injecting a deliberate random disturbance to the lo...
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
Managing Multi-Modal Sensor Networks Using Price TheoryEmail this article to a colleague.
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We propose a unified framework for sensor management in multi-modal sensor networks, which is inspired by the trading behavior of economic agents in commercial markets. Each sensor node (SN) acts as a seller who wants to sell the data it collects, to the sensor network manager (SM) who acts as a buyer. The resources and the data are priced by looking to balance global supply and demand, with the SN required to purchase resources for producing the data, and the SM required to purchase data to accomplish his tasks. We model this interaction as a double sided market, with both consumers and producers, and propose an iterative...
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
Cellular Multiuser Two-Way MIMO AF Relaying via Signal Space Alignment: Minimum Weighted SINR MaximizationEmail this article to a colleague.
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In this paper, we consider linear MIMO transceiver design for a cellular two-way amplify-and-forward relaying system consisting of a single multiantenna base station, a single multiantenna relay station, and multiple multiantenna mobile stations (MSs). Due to the two-way transmission, the MSs could suffer from tremendous multiuser interference. We apply an interference management model exploiting signal space alignment and propose a transceiver design algorithm, which allows for alleviating the loss in spectral efficiency due to half-duplex operation and providing flexible performance optimization accounting for each user'...
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
Noncoherent OSTBC-OFDM for MIMO and Cooperative Communications: Perfect Channel Identifiability and Achievable Diversity OrderEmail this article to a colleague.
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This paper considers the context of orthogonal space-time block coded OFDM (OSTBC-OFDM) without channel state information at the receiver. Assuming noncoherent maximum-likelihood detection, the interest herein lies in detection within one OSTBC-OFDM block, motivated by its capability of accommodating relatively fast block fading channels. Our investigation focuses on analysis aspects, where we seek to establish practical noncoherent BPSK/QPSK OSTBC-OFDM schemes that have provably good channel identifiability and diversity properties. We consider perfect channel identifiability (PCI), a strong condition guaranteeing unique ...
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
Relay Assisted Physical Resource Sharing: Projection Based Separation of Multiple Operators (ProBaSeMO) for Two-Way Relaying With MIMO Amplify and Forward RelaysEmail this article to a colleague.
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In this paper, we investigate a relay-assisted resource sharing scenario, namely, multi-operator two-way relaying with a MIMO amplify-and-forward (AF) relay. Here, the spectrum and the relay (infrastructure) are shared among multiple operators. We develop the projection based separation of multiple operators (ProBaSeMo) relay transmit strategy, which is inspired by the block diagonalization (BD) and regularized block diagonalization (RBD) schemes that are space-division multiple access (SDMA) approaches for multi-user MIMO systems. If the user terminals are equipped with multiple antennas, appropriate precoding and decodin...
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
Realizable Spatio-Temporal Tomlinson-Harashima Precoders: Theory and Fast ComputationEmail this article to a colleague.
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We derive the optimal realizable Tomlinson-Harashima precoder for frequency-selective multiple-input multiple-output (MIMO) channels with respect to a simplified mean square error (MSE) criterion. Realizability means that, in contrast to other works, we do not restrict the internal filters of the precoder to have finite impulse responses (FIRs) but nevertheless ensure that the precoder can be operated in real-time subject to a finite latency time which can be chosen by the system designer. In particular, this allows us to consider channels with infinite impulse responses (IIRs) as they occur, e.g., in digital subscriber li...
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
Optimal Energy Allocation for Wireless Communications With Energy Harvesting ConstraintsEmail this article to a colleague.
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We consider the use of energy harvesters, in place of conventional batteries with fixed energy storage, for point-to-point wireless communications. In addition to the challenge of transmitting in a channel with time selective fading, energy harvesters provide a perpetual but unreliable energy source. In this paper, we consider the problem of energy allocation over a finite horizon, taking into account channel conditions and energy sources that are time varying, so as to maximize the throughput. Two types of side information (SI) on the channel conditions and harvested energy are assumed to be available: causal SI (of the p...
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
Joint Estimation of Channel and Oscillator Phase Noise in MIMO SystemsEmail this article to a colleague.
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Oscillator phase noise limits the performance of high speed communication systems since it results in time varying channels and rotation of the signal constellation from symbol to symbol. In this paper, joint estimation of channel gains and Wiener phase noise in multi-input multi-output (MIMO) systems is analyzed. The signal model for the estimation problem is outlined in detail and new expressions for the Cramér-Rao lower bounds (CRLBs) for the multi-parameter estimation problem are derived. A data-aided least-squares (LS) estimator for jointly obtaining the channel gains and phase noise parameters is derived. Nex...
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
Compressive Wideband Power Spectrum EstimationEmail this article to a colleague.
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In several applications, such as wideband spectrum sensing for cognitive radio, only the power spectrum (a.k.a. the power spectral density) is of interest and there is no need to recover the original signal itself. In addition, high-rate analog-to-digital converters (ADCs) are too power hungry for direct wideband spectrum sensing. These two facts have motivated us to investigate compressive wideband power spectrum sensing, which consists of a compressive sampling procedure and a reconstruction method that is able to recover the unknown power spectrum of a wide-sense stationary signal from the obtained sub-Nyquist rate samp...
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
Random Subcarrier Allocation in OFDM-Based Cognitive Radio NetworksEmail this article to a colleague.
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This paper investigates the performance of an orthogonal frequency-division multiplexing (OFDM)-based cognitive radio (CR) spectrum sharing communication system that assumes random allocation and absence of the primary user's (PU) channel occupation information, i.e., no spectrum sensing is employed to acquire information about the availability of unused subcarriers. In case of a single secondary user (SU) in the secondary network, due to the lack of information of PUs' activities, the SU randomly allocates the subcarriers of the primary network and collide with the PUs' subcarriers with a certain probability. To maintain ...
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
A Practical Architecture for OFDM-Based Decode-and-Forward Physical Layer Network CodingEmail this article to a colleague.
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In physical layer network coding, it has been argued that performance improvements of a few dBs can be achieved by decoding a linear combination of colliding frames at an intermediate relay. The best results have been achieved by directly decoding the necessary linear combination rather than decoding each of the colliding packets, but so far only rather impractical architectures have been proposed. We explore in this paper a more pragmatic approach, where some important problems have been solved. We show by simulation that the proposed system is able to outperform analog network coding, the only other known practical archi...
Source: IEEE Transactions on Signal Processing - September 1, 2012 Category: Biomedical Engineering Source Type: research
