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IEEE International Symposium on Spread Spectrum Techniques and Applications

作者： Jianming Zhu Y. Bar-Ness Center for Communications and Signal Processing Research Department of Electrical and Computer Engineering New Jersey Institute of Technology University Heights Newark NJ USA

A distributed signature sequence adaptation scheme is considered for the downlink of a MC-CDMA system, wherein each mobile user selfishly adapts its signature sequences to improve its own performance using measurements at its location with no consideration to the performance of other users in the system. The convergence of such an adaptation scheme is shown using a game theory framework. That is, with any initial signature sequences in the system, the proposed adaptation scheme definitely converges to a set of signature sequences at which no user can further improve its own performance with individual adaptation.

关键词： Downlink Multicarrier code division multiple access Iterative algorithms Game theory Wireless communication System performance Multiple access interference Base stations Channel state information Distributed algorithms

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Mobile speed estimation using diversity combining in fading channels

Mobile speed estimation using diversity combining in fading ...

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IEEE Global Telecommunications Conference, 2004. GLOBECOM '04.

作者： Hong Zhang A. Abdi Center for Communications and Signal Processing Research Department of Elec and Computer Engineering New Jersey Institute of Technology Newark NJ USA

We consider the problem of mobile speed estimation using two common diversity schemes, selection combining (SC) and maximal ratio combining (MRC). We derive three new estimators, which rely on the inphase zero crossing rate, inphase rate of maxima, and the instantaneous frequency zero crossing rate of the output of SC. We also propose two estimators which work based on the level crossing rates of the envelopes at the output of SC and MRC. The performances of all these estimators are investigated in realistic noisy environments with different kinds of scattering and different numbers of diversity branches. Our simulation results reveal that a two-branch envelope level crossing rate estimator provides a performance gain. In terms of the implementation complexity, the SC-based estimator is superior to MRC, as it does not need channel estimation.

关键词： Diversity reception Fading Diversity methods Frequency estimation Mobile communication signal processing Working environment noise Rayleigh scattering Performance gain Channel estimation

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Antiderivative series for differentiable functions

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International Journal of Mathematical Education in Science and Technology 2004年第5期35卷 725-731页

作者： Howard, Roy M. Communications and Signal Processing Group Department of Electrical and Computer Engineering Curtin University of Technology Perth 6845 Australia

A series defining the antiderivative of an nth order differentiable function is defined. This series provides an explicit expression for the second part of the Fundamental Theorem of Calculus and can facilitate the es...

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Frequency invariant beamforming in subbands

Frequency invariant beamforming in subbands

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Asilomar Conference on signals, Systems & computers

作者： Wei Liu S. Weiss Communications & Signal Processing Group Department of Electrical & Electronic Engineering Imperial College London UK Communications Research Group School of Electronics & Computer Science University of Southampton UK

In this paper, two subband implementations of a frequency invariant beamformer (FIB) are studied. In the first structure, the received array signals are split into subbands and an FIB is operated in each of the corresponding decimated subbands, with a potential of achieving a lower computational complexity. As the spatio-temporal distribution of the subband signals is different from the original fullband signal, a modified design method of the FIB is proposed. Based on the subband implementation, we then change the sensor spacings of different subband signals so that lower frequency bands have a larger spacing, which results in a class of FIBs with scaled aperture with improved performance in lower frequencies. Several design examples are given to show the performance of our new structures.

关键词： Frequency Array signal processing Design methodology Filter bank Computational complexity computer science Educational institutions Apertures Sonar applications Radar applications

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Blind identification of two dimensional Volterra models using minimax type of optimization and higher-order cumulants

Blind identification of two dimensional Volterra models usin...

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Asilomar Conference on signals, Systems & computers

作者： D. Gansawat T. Stathaki F.J. Harris Communications & Signal Processing Group Department of EEE Imperial College London London UK Electrical & Computer Engineering San Diego State University USA

In this contribution, we further examine our previous studies on the nonlinear texture image modelling based on Volterra series. The observed image, which is assumed to be expressed as an output of a two dimensional Volterra filter driven by a Gaussian input image, is corrupted by an independent Gaussian random noise. Both of the input image and filter parameters are unknown and hence, the problem can be classified as blind system identification. To estimate the unknown parameters, we formulate the equations that relate the parameters of the image model with the cumulant properties of the observed output image. The solution of the formulated equations which are highly nonlinear, is achieved through minimax type of optimization.

关键词： Minimax techniques Filters Nonlinear equations Gaussian noise Kernel signal processing Educational institutions System identification Parameter estimation Nonlinear systems

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Space-time coding for wireless sensor networks with cooperative routing diversity

Space-time coding for wireless sensor networks with cooperat...

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Asilomar Conference on signals, Systems & computers

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

In this work, the idea of cross-layer design for wireless sensor networks is exploited to improve the network performance. We present a new energy efficient cooperative routing scheme with space diversity using space-time block codes (STBCs) as well as the link quality. In our solution, the selected multiple nodes act as multiple transmitting and receiving antennas. Full diversity from the orthogonal STBC is utilized to overcome multipath fading and to enhance power efficiency. The steady state network performance measures, such as, network throughput and delay are analyzed via Markov chain modelling. Compared with the traditional single relay routing method and the single receiving diversity routing method, our proposed method outperforms the other two in low SNR environments and provides higher throughput and similar delay in high SNR environments.

关键词： Wireless sensor networks Routing Throughput Cross layer design Energy efficiency Block codes Receiving antennas Transmitting antennas Fading Steady-state

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A two-dimensional autoregressive modelling technique using a constrained optimisation formulation and the minimum hierarchical clustering scheme

A two-dimensional autoregressive modelling technique using a...

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Asilomar Conference on signals, Systems & computers

作者： S. Lee T. Stathaki F.J. Harris Communications & Signal Processing Group Department of EEE Imperial College London London UK Electrical & Computer Engineering San Diego State University CA USA

The problem of texture characterisation is attempted using a two-dimensional (2-D) autoregressive (AR) modelling technique. Each distinct texture is represented by a different set of 2-D AR model coefficients. A method to estimate AR model coefficients is proposed by relating the extended Yule-Walker system of equations in the third-order statistical domain to the same system in the second-order statistical domain using a constrained optimisation formulation. This method is applied to an image with a constant texture in block-by-block process, so that a number of sets of AR model coefficients are obtained. The minimum hierarchical clustering technique and a weighting scheme are then applied to these sets of coefficients, in order to obtain the final estimation.

关键词： Constraint optimization Equations Gaussian noise signal to noise ratio signal processing Educational institutions

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Development of digital image retrieval technique using autocorrelogram and wavelet based texture

Development of digital image retrieval technique using autoc...

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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： P. Skulsujirapa S. Aramvith S. Siddhichai Digital Signal Processing Research Laboratory Department of Electrical Engineering Faculty of Engineering Chulalongkom University Bangkok Thailand National Electronics and Computer Technology Center Pathumthani Thailand

In this paper, we present the development of a digital image retrieval technique using autocorrelogram and wavelet based texture feature. Autocorrelogram is a color feature that is able to incorporate the spatial correlation of alike color and is tolerant to large changes in appearance, color, contrast, and brightness. A wavelet transform is used to analyze the textures that are characterized by their energy distribution in each sub-band. We propose an integration of the autocorrelogram and wavelet based texture to improve the performance of the image retrieval system. Experimental results suggest that the proposed integration offers much better performance than using the features separately.

关键词： Digital images Image retrieval Image databases Histograms Spatial databases Wavelet transforms Feature extraction Indexing Content based retrieval Shape

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Comparative analysis of gene expression and DNA copy number data for pancreatic and breast cancers using an orthogonal decomposition

Comparative analysis of gene expression and DNA copy number ...

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Proceedings of the IEEE Computational Systems Bioinformatics Conference, CSB

作者： J.A. Berger S. Hautaniemi S.K. Mitra Department of Electrical and Computer Engineering University of California Santa Barbara CA USA Tampere International Center for Signal Processing Tampere University of Technology Tampere Finland

The causes of over-expression for many diseases are typically unknown, but current studies show that copy number aberrations may be strong candidates for driving gene overexpression. We present the use of the generalized singular value decomposition (GSVD) for simultaneously identifying relevant influences common to only copy numbers, gene expression, or both measurements in conjunction. These groups are reported and gene ontology (GO) annotations are used as a functional assessment of the groupings accompanied by probabilistic significance obtained by combinatorics. We illustrate this method for two independently published studies of pancreatic cancer and breast cancer, where public gene expression and DNA copy number data is provided and measured across numerous tumor cell lines.

关键词： Gene expression DNA Pancreas Breast cancer Bioinformatics Singular value decomposition Genomics Cloning signal processing Diseases

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Construction of linearly transformed planar BDD by Walsh coefficients

Construction of linearly transformed planar BDD by Walsh coe...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： M.G. Karpovsky R.S. Stankovic J.T. Astola Department of Electrical and Computer Engineering Boston University Boston MA USA Department of Computer Science Nis Serbia Tamphere Int. Center for Signal Processing Tampere University of Technology Tampere Finland

In VLSI design, crossings of interconnections occupy space and cause delay. In particular, it is desirable to have planar networks for FPGA synthesis and sub-micron LSIs, since delays in the interconnections and crossings are comparable to the delays for logic circuits. Decision diagrams (DDs) provide a simple technology mapping, and planar DDs result in planar networks. In this paper, we present a deterministic method to construct planar Linearly Transformed Binary Decision Diagrams (BDDs) by Walsh transform spectral coefficients.

关键词： Binary decision diagrams Integrated circuit interconnections Space technology Very large scale integration Delay Field programmable gate arrays Circuit synthesis Network synthesis Logic circuits Data structures

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