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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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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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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

引用

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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Distributed Matlab based signal and image processing using JavaPorts

Distributed Matlab based signal and image processing using J...

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

作者： E.S. Manolakos D.G. Galatopoullos A.P. Funk Communications and Digital Signal Processing Center for Research and Graduate Studies Electrical and Computer Engineering Department Northeastern University Boston MA USA

Many scientists and engineers have signal and image processing applications that involve large data sets and could benefit from parallel processing on readily-available clusters of workstations (COWs). Unfortunately these applications often exist as legacy code, such as Matlab functions, which are not easily parallelizable. The goal of the JavaPorts project is to provide a framework for flexible development of parallel and distributed component-based applications for heterogeneous COWs. The latest version of the package supports the integration of Java and Matlab components into the same application. The main features of the JavaPorts framework and its tools are discussed and application examples are presented which highlight its ability to support the rapid prototyping of parallel and distributed computing strategies with communicating Java and Matlab components.

关键词： signal processing Image processing Java Cows Data engineering Parallel processing Workstations Packaging Prototypes Distributed computing

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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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Distributed signature sequence adaptation for downlink multicode MC-CDMA system

Distributed signature sequence adaptation for downlink multi...

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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 ...

引用

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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