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Automatic estimation of mobility shift coefficients in DNA chromatograms

Automatic estimation of mobility shift coefficients in DNA c...

引用

IEEE Workshop on Neural Networks for signal processing

作者： L. Andrade E.S. Manolakos Communications and Digital Signal Processing (CDSP) Center Electrical and Computer Engineering Department Northeastern University Boston MA USA

A physical understanding of mobility pattern differences among DNA fragments of different length drives the formulation of a complete statistical model for mobility shifts correction (MSC). Algorithms are then developed that compute mobility shifts and correct the raw trace, leaving significant peaks aligned i.e. in correct order and centered with respect to their neighbors. The fully automated MSC method we develop is shown to improve substantially base-calling performance in the first 100-200 bp of DNA sequencing reads while it does not require any dye chemistry specific calibration procedure. This is very encouraging since it is known that lack of adequate MSC is the main source of base-calling errors in the early part of a DNA sequencing read.

关键词： Predictive models Slabs Electrokinetics Digital signal processing DNA computing signal processing algorithms Chemistry Calibration Software performance Data analysis

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An enhanced dropping scheme for proportional differentiated services

An enhanced dropping scheme for proportional differentiated ...

引用

IEEE International Conference on communications (ICC)

作者： Jingdi Zeng N. Ansari Center for Communications and Signal Processing Research Electrical and Computer Engineering Department New Jersey Institute of Technology Newark NJ USA

As the DiffServ architecture is gaining ground, traffic engineering requires major adjustments. In addition, the measurement-based strategy gas been widely adopted owing to its advantages of flexibility and easy adaptation. This article reviews measurement-based dropping schemes. Based on the definition and investigation of the "packet shortage" phenomenon, an enhanced dropping scheme for the proportional differentiated packet loss, referred to as "debt-aware," is proposed. Simulation parameters, as compared to a typical proportional dropping mechanism. More simulations have been applied to demonstrate the merits of this improved method.

关键词： Traffic control Telecommunication traffic Loss measurement Quality of service Diffserv networks Web and internet services Delay signal processing computer architecture Intserv networks

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Reduced complexity maximum likelihood detection for V-BLAST systems

Reduced complexity maximum likelihood detection for V-BLAST ...

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MILCOM, Military communications Conference

作者： L. He H. Ge Center for Communications and Signal Processing Research Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

Proposed and studied in this work is a reduced complexity maximum likelihood (ML) detection scheme, which uses a predecoder guided local exhaustive search, for V-BLAST systems. A polygon searching algorithm and an ordered successive interference cancellation (O-SIC) sphere searching algorithm are major components of the proposed multistep ML detectors. The effects of predecoder's performance on the total decoding complexity was studied by simulation. The complexity of the proposed algorithm depends on the operating signal to noise ratio (SNR) of the system. At reasonable high SNRs, its complexity is comparable to that of O-SIC algorithm, a commonly used decoding algorithm for V-BLAST. For V-BLAST systems using a large number of transmit antennas, we also propose a new detection algorithm termed ordered group-wise interference cancellation (O-GIC) to further reduce decoding complexity. The O-GIC based detection scheme is not a ML detection scheme, however, its performance is shown to outperform that of the O-SIC.

关键词： Maximum likelihood detection signal processing algorithms Detectors Maximum likelihood decoding Transmitting antennas Interference cancellation signal to noise ratio Silicon carbide Computational complexity Maximum likelihood estimation

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Fast maximum likelihood decoding of quasi-orthogonal codes

Fast maximum likelihood decoding of quasi-orthogonal codes

引用

Asilomar Conference on signals, Systems & computers

作者： Lei He Hongya Ge Center for Communications and Signal Processing Research Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

ISBN: (纸本)0780381041

In this paper, we present a new fast maximum likelihood (ML) detection algorithm for quasi-orthogonal space-time block codes ( QO-STBC). Observed in a transformed signal space, the QO-STBC encoder embeds information into a group of orthogonal subspaces of rank two. We propose a fast technique that separates information embedded in each rank-two subspace by a simple linear processing, and decodes the separated information independently. For a multiple-input and multiple-output (MIMO) system, decoding algorithm decomposes the original N /spl times/ N system into N/2 parallel 2 /spl times/ 2 MIMO sub-systems without information loss followed by MRC. It then detects symbols contained in each 2 /spl times/ 2 MIMO sub-system using a sphere decoder of reduced computational complexity.

关键词： Maximum likelihood decoding MIMO Block codes Symmetric matrices signal processing algorithms Space technology Computational complexity Transmitters Digital modulation Maximum likelihood estimation

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QPSK orthogonal space-time coding scheme with full-rate and full-diversity for system with four transmit antennas

QPSK orthogonal space-time coding scheme with full-rate and ...

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International Conference on Acoustics, Speech, and signal processing (ICASSP)

作者： Lei He Hongya Ge Center for Communications and Signal Processing Research Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

ISBN: (纸本)0780376633

We present a novel space-time orthogonal coding scheme with full-rate and full-diversity on a QPSK constellation for communication systems with four transmit antennas. We also study the performance of the newly proposed coding scheme in comparison with that of half rate full diversity orthogonal codes as well as full rate half diversity quasi-orthogonal codes. We demonstrate that the proposed coding scheme not only offers full rate but also outperforms the other two schemes when SNR increases.

关键词： Quadrature phase shift keying Transmitting antennas Maximum likelihood decoding signal to noise ratio Bit error rate Space technology Wireless communication Receiving antennas Helium signal processing

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Blind equalization of communication sequences based on optimization of cumulant criteria

Blind equalization of communication sequences based on optim...

引用

IEEE Conference on Wireless communications and Networking

作者： Hsiao-Chun Wu Dongxin Xu Communications and Signal Processing Laboratory Department of Electrical and Computer Engineering Louisiana State University Baton Rouge LA USA BBN Technologies GTE Cambridge MA USA

Blind equalization draws a lot of attention. Several statistical objective functions such as kurtosis and constant modulus were based on the noise-free model and hence their ISI cancellers were sensitive to noise. In this paper, a unifying adaptive blind equalization method is proposed, which can be robust to noise than the current cumulant-based adaptive methods. Our new objective functions can be applied for wired or wireless i.i.d. communication symbols with noise. The simulation shows that our new method outperforms the kurtosis-based method when the background noise exists.

关键词： Blind equalizers Probability density function signal processing Finite impulse response filter Laboratories Delay Linear approximation Gaussian noise Sufficient conditions Taylor series

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Non-coherent estimator-correlators for unresolved multipath Ricean channels

Non-coherent estimator-correlators for unresolved multipath ...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： F. Danilo-Lemoine H. Leib Department of Syst. and Computer Engineering Broadband Communications & Wireless Systems Centre Carleton University Ottawa ONT Canada Department of Electrical and Computer Engineering McGill University Telecommunications and Signal Processing Laboratory Montreal QUE Canada

This paper considers detection techniques for unresolved Ricean/Rayleigh fading multipath channels. It is well known that the optimal receiver has an estimator-correlator form, with a minimum mean-square error (MMSE) estimate. With known multipath delays and unknown specular phases, the Ricean non-coherent multipath channel is a case where the received noiseless signal process is non-Gaussian, and the MMSE estimator is non-linear in the observation. This work presents novel, explicit expressions for such a MMSE estimator. It is shown that the MMSE estimate has the same multipath format as the noiseless received signal, with the unknown parameters replaced by corresponding estimates. The MMSE estimator scales down contributions from specular multipath components with poor phase estimates, reducing their effect on the detection process. The estimator includes a multipath decorrelation operation which is essential to avoid error floors over unresolved multipath channels. Based on matched filter bounds, it is shown that little degradation gains are obtained by employing suboptimal linear estimator-correlators, provided that they include the decorrelation operation.

关键词： Multipath channels Phase estimation Delay estimation Decorrelation Rayleigh channels Phase noise signal processing Phase detection Matched filters Degradation

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International Conference on Information Technology: Coding and Computing (ITCC)

作者： Hong Zhao N. Ansari Y.Q. Shi Center for Communications and Signal Processing Research Department of Electrical and Computer Engineering New Jersey Institute of Technology University Heights Newark NJ USA

Recent studies of high quality; high resolution traffic measurements have revealed that network traffic appears to be statistically self similar. Contrary to the common belief, aggregating self-similar traffic streams can actually intensify rather than diminish burstiness. Thus, traffic prediction plays an important role in network management. In this paper, least mean kurtosis (LMK), which uses the negated kurtosis of the error signal as the cost function, is proposed to predict the self similar traffic. Simulation results show that the prediction performance is improved greatly over the least mean square (LMS) algorithm.

关键词： Traffic control Telecommunication traffic Predictive models Least squares approximation Aggregates Character generation Internet Mathematical model Resource management Higher order statistics

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An Automated Method for Neuronal Spike Source Identification

An Automated Method for Neuronal Spike Source Identification

引用

International Joint Conference on Neural Networks 2003

作者： Santiago, Roberto A. McNames, James Burchiel, Kim Lendaris, George G. NW Compl. Intelligence Laboratory System Science Portland State University Portland OR United States Biomed. Signal Processing Laboratory Electrical and Computer Engineering Portland State University Portland OR United States Department of Neurological Surgery Oregon Health Sciences University Portland OR United States

Analysis of microelectrode recordings (MER) of extracellular neuronal activity has gained increasing interest due to potential improvements to surgical techniques involving ablation or placement of deep brain stimulators, as is common in the treatment of Parkinson's disease. Critical to these procedures is the identification of different brain structures such as the globus pallidus internus (GPI). Evidence suggests that the spike trains from individual neurons contain enough information to identify the brain structure in which they are located. For the work reported here, spike train data gathered during surgical procedure from multiple patients is used. Using a moving window sampling approach, a novel feature extraction method for spike trains was developed. This method is then used in combination with a support vector classification algorithm. Results strongly indicate that the sampling methods reported here are able to extract the necessary information for highly accurate spike source identification.

关键词： Neurosurgery

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CMOS transconductor design for VHF filtering applications

CMOS transconductor design for VHF filtering applications

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Luo Zhenying M.F. Li Yong Lian S.C. Rustagi Signal Processing and VLSI Design Laboratory Department of Electrical and Computer Engineering National University of Singapore Singapore Institute of Microelectronics Singapore

A new differential input CMOS transconductor circuit for VHF filtering application is introduced. The new circuit has a very high frequency bandwidth, large linear differential mode input range and good common mode signal rejection capability. Using 0.35 /spl mu/m CMOS technology with 3 V power supply, the transconductor has a 0.9 V linear differential input range with a -54.6dB total harmonic distortion (THD) and more than 1 GHz - 3dB bandwidth. A 3rd order elliptic low pass g/sub m/-C filter with a cutoff frequency of 150MHz is demonstrated as an application of the new transconductor.

关键词： Transconductors Filtering VHF circuits Power harmonic filters Bandwidth CMOS technology Frequency Power supplies Total harmonic distortion Band pass filters

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