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Carrier frequency offset estimation for OFDM systems with I/Q imbalance

Carrier frequency offset estimation for OFDM systems with I/...

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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： Feng Yan Wei-Ping Zhu M. Omair Ahmad Centre for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

In orthogonal frequency division multiplexing (OFDM) communication systems, there are two main types of radio frequency front-end imperfections, i.e., carrier frequency offset and in-phase/quadrature (I/Q) imbalance, which deteriorate the demodulation performance of direct conversion receiver. In this paper, a new frequency offset estimation algorithm using preambles specified in IEEE 802.11a is proposed considering the presence of I/Q imbalance. The new algorithm enjoys a low computational complexity and is less dependent on the amplitude imbalance and the angular error of the I and Q components. Simulation results show that the proposed algorithm is superior to some of the existing algorithms.

关键词： Frequency estimation OFDM Radio frequency signal processing algorithms Demodulation Receivers Wireless LAN Fading Wireless sensor networks RF signals

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Variable step-size adaptive channel estimation for WCDMA receiver

Variable step-size adaptive channel estimation for WCDMA rec...

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International Symposium on Intelligent Multimedia, Video and Speech processing

作者： Xi-Bin Han Wei-Ping Zhu Centre for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

ISBN: (纸本)0780386876

An efficient channel estimation algorithm using a variable step-size adaptive filter is proposed for wideband code division multiple access (WCDMA) communication systems. The new algorithm is able to achieve a fast convergence and a low steady state error compared with a conventional constant step-size adaptive filtering method. The proposed algorithm is analyzed and simulated for multipath Rayleigh fading channels, showing the true channel response and the estimation results. The BER performance of the system is also simulated and compared with the Bhattacharyya bound.

关键词： Channel estimation Multiaccess communication Adaptive filters Wideband Filtering algorithms Convergence Steady-state Algorithm design and analysis Analytical models Fading

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An efficient buffer-based architecture for on-line computation of 1-D discrete wavelet transform

An efficient buffer-based architecture for on-line computati...

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

作者： Chengjun Zhang Chunyan Wang M.O. Ahmad Center for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

In this paper, we propose a flexible architecture that performs the computation of the discrete wavelet transform, requiring a small memory space and is capable of operating at high sampling rate. The architecture employs two filtering blocks to compute the transform and one buffer to store the intermediate results. Each filtering block has two processing units that operate independently in parallel using a two-phase scheduling. An efficient scheme for the synchronization of the data flow among the three blocks is provided in order to minimize the buffer size and increase the speed of operation. Verilog and HSPICE simulation results are presented to show that the proposed architecture is more efficient for the computation of a fully decomposed discrete wavelet transform with high-tap filters than some other existing architectures in terms of their areas and speed of operations.

关键词： Discrete wavelet transforms computer architecture Filtering High performance computing Sampling methods Discrete transforms Buffer storage Processor scheduling Hardware design languages Computational modeling

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Wideband-CDMA channel estimation: a data-aided multi-slot averaging method

Wideband-CDMA channel estimation: a data-aided multi-slot av...

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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： Xi-Bin Han Wei-Ping Zhu Centre for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

ISBN: (纸本)078038346X

In this paper, a two-step channel estimation scheme is presented for downlink wideband code division multiple access (W-CDMA) communication systems. The proposed method employs the time multiplexed pilot symbols for an initial coarse estimation followed by a data-aided fine estimation in order to achieve a fast and accurate estimation of the complex channel gain. Our simulation shows that the proposed method works very well for both slow and fast fading channels. The computational complexity required by the proposed estimation is significantly reduced compared to some of the existing estimation techniques.

关键词： Channel estimation Multiaccess communication Fading Delay estimation Downlink Yield estimation Time division multiplexing Filters Frequency Wideband

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Some new results in the design of Mth-band FIR filters

Some new results in the design of Mth-band FIR filters

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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： Chao Wu Wei-Ping Zhu M.N.S. Swamy Centre for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

In this paper, the design of Mth-band FIR filters via semidefinite programming (SDP) is investigated. Some of the frequency response properties of a general nonlinear-phase Mth-band filter are first examined, yielding a few constraints for the amplitude and phase responses of the Mth-band filter. An SDP-based optimization problem is formulated for the least-square and minimax design of Mth-band filters. Although the formulation is established for a nonlinear phase filter, the design result shows that an exactly linear phase can be obtained when the desired phase/delay characteristic is properly specified.

关键词： Finite impulse response filter Design optimization Time domain analysis Passband signal processing Nonlinear filters Design methodology IIR filters Constraint optimization Band pass filters

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A watermark embedding scheme in wavelet transform domain

A watermark embedding scheme in wavelet transform domain

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IEEE Region 10 International Conference TENCON

作者： Chao Wu Wei-Ping Zhu M.N.S. Swamy Centre for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

In this paper, an efficient watermark embedding scheme is presented in the wavelet transform domain. A pseudorandom sequence is weighted using a weighting function and then embedded to the wavelet transform coefficients of a host image. The proposed new weighting function consists of a perceptual mask and a reliability mask, which take into account, respectively, the imperceptibility and the robustness of the marked image. A detection algorithm based on the correlation of the watermark and the marked image is also proposed. Simulation results show that the proposed embedding algorithm is very robust against various attacks including compression, cropping and low-pass filtering.

关键词： Watermarking Wavelet domain Wavelet transforms Robustness Frequency Discrete wavelet transforms Internet Chaotic communication signal processing Embedded computing

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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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Conference Record of the Thirty-Eighth Asilomar Conference on signals, Systems and computers

作者： Gansawat, Duangrat Stathaki, Tania Harris, Frederic J Communications and Signal Processing Group Department of EEE Imperial College London Exhibition Road London SW7 2AZ United Kingdom Electrical and Computer Engineering San Diego State University United States

In this contribution, we farther 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. © 2004 IEEE.

关键词： Mathematical models

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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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Conference Record of the Thirty-Eighth Asilomar Conference on signals, Systems and computers

作者： Lee, Sarah Stathaki, Tania Harris, Frederic J. Communications and Signal Processing Group Department of EEE Imperial College London Exhibition Road London SW7 2AZ United Kingdom Electrical and Computer Engineering San Diego State University CA 92182 United States

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. ©2004 IEEE.

关键词： signal processing

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On extended finite element method (XFEM) for modelling of organ deformations associated with surgical cuts

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International Symposium on Medical Simulation, ISMS 2004

作者： Vigneron, Lara M. Verly, Jacques G. Warfield, Simon K. Signal Processing Group Department of Electrical Engineering and Computer Science University of Liège Belgium Surgical Planning Laboratory Brigham and Women’s Hospital and Harvard Medical School Boston United States

ISBN: (纸本)3540221867

The Extended Finite Element Method (XFEM) is a technique used in fracture mechanics to predict how objects deform as cracks form and propagate through them. Here, we propose the use of XFEM to model the deformations resulting from cutting through organ tissues. We show that XFEM has the potential for being the technique of choice for modelling tissue retraction and resection during surgery. Candidates applications are surgical simulators and image-guided surgery. A key feature of XFEM is that material discontinuities through FEM meshes can be handled without mesh adaptation or remeshing, as would be required in regular FEM. As a preliminary illustration, we show the result of XFEM calculation for a simple 2D shape in which a linear cut was made. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Finite element method

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Heart rate variability analysis of effect of nicotine using lomb- welch periodograms

Heart rate variability analysis of effect of nicotine using ...

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Conference Proceedings - 26th Annual International Conference of the IEEE engineering in Medicine and Biology Society, EMBC 2004

作者： Thong, Tran Yung, Iris O. Zajdel, Daniel P. Ellingson, Roger M. McNames, James Aboy, Mateo Oken, Barry S. Department of Biomedical Engineering Oregon Health and Science University Beaverton OR School of Medicine Oregon Health and Science University Portland OR Department of Neurology Oregon Health and Science University Portland OR Biomed. Signal Processing Laboratory Electrical and Computer Engineering Portland State University Portland OR

Heart rate variability (HRV) is frequently used to measure autonomic nervous system (ANS) activity. However, little is known about the mechanism underlying pharmacologically induced changes in HRV. Previous research has shown that nicotine exposure stimulates the ANS, mediating a wide spectrum of physiological and behavioral effects, including altered respiratory sinus arrhythmia and enhanced arousal and attention. Using Lomb-Welch periodograms, the effect of nicotine on the ANS in 14 nicotinenaive human subjects are studied. Results showed an increase in the low frequency (LF) to high frequency (HF) ratio with little change in mean heart rate. Results suggest that nicotine affects both sympathetic and parasympathetic reactivities and that the LF/HF best characterizes early ANS activated nicotine changes in HRV. The Lomb-Welch periodogram of the HRV is also compared to the conventional interpolated Welch periodogram. The attenuation of the high frequency components due to interpolation of the non-uniform R-R intervals is found to be a function of the power of the high frequency components, increasing with increasing power. Thus analyses using Welch periodograms that make use of the high frequency components may yield erroneous results.

关键词： Biomedical engineering

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