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Wavelet filters in multi-resolution motion estimation

Wavelet filters in multi-resolution motion estimation

引用

Canadian Conference on electrical and computer engineering (CCECE)

作者： Jinwen Zan M.N.S. Swamy M.O. Ahmad Center for Signal processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

ISBN: (纸本)0780367154

The performance of various wavelets, including those known to be well suited for the coding of still images, are evaluated for the multi-resolution motion estimation of video sequences. The multi-resolution motion estimation scheme proposed by Zhang and Zafar (1992), which has been widely cited in the literature, is used as the simulation scheme in this study. The prediction mean square error (PMSE) in the wavelet transform coefficient domain is used in our study as the measure for prediction performance. In order to show the overall rate distortion performance, the number of bits needed to encode the motion vectors is also calculated. Simulation results show that the 7/9 biorthogonal wavelet, one of the best wavelets for the coding of still images, is the best wavelet for the task of multi-resolution motion estimation among the wavelets evaluated in this study.

关键词： Filters Motion estimation Wavelet transforms Frequency Wavelet domain Image coding Fourier transforms Wavelet analysis Energy resolution Video sequences

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A reduced complexity partial sampling MMSE receiver for asynchronous MC-CDMA systems

A reduced complexity partial sampling MMSE receiver for asyn...

引用

IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： Kunjie Wang Pingping Zong Y. Bar-Ness Center for Communications and Signal Processing Research Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

In multi-carrier CDMA (MC-CDMA) system, timing of the starting point of the desired signal must be estimated to demodulate the desired signal. Especially for asynchronous MC-CDMA systems, rather a complicated timing estimation is needed, due to the random delays of all users. Zong, Wang and Bar-Ness (see VTC2001)proposed a partial sampling MMSE (PS-MMSE) receiver which does not require timing estimation. However, it requires several times more filter's taps than the conventional MC-CDMA receiver. The number of taps is a multiple of, and depends on, the number of subcarriers (i.e., the processing gain). A reduced complexity partial sampling MMSE (RPS-MMSE) receiver is proposed, which can be adaptively implemented by using the least-mean-square (LMS) algorithm. The proposed structure allows one to choose the number of taps independent of the number of subcarriers, hence having more flexibility in choosing the number of taps than with PS-MMSE receiver. With this structure, we can use fewer taps than with the PS-MMSE receiver and still can obtain comparable performance.

关键词： Sampling methods Multicarrier code division multiple access Timing Filters signal sampling signal processing Multiaccess communication Delay estimation Least squares approximation Diversity reception

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On estimating temporal and spatial channel parameters for DS-CDMA system over multipath Rayleigh fading channels

On estimating temporal and spatial channel parameters for DS...

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

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

We develop an approximate maximum likelihood (ML) method for joint estimation of time delays and directions-of-arrivals (DOA) for direct-sequence code-division multiple-access (DS-CDMA) systems over multipath Rayleigh fading channels. In developing the proposed estimation scheme, we model the known training sequence of the desired user as the desired signal and the multiple access interferences (MAI)-plus-AWGN as unknown colored Gaussian noise uncorrelated with the desired signal. To reduce computational complexity, a fast algorithm realization is proposed taking advantage of the ridge structure of the objection function. Analytical and simulation results are presented to illustrate the performance in comparison with the Cramer-Rao bounds (CRB). It is shown that the proposed algorithm is near-far resistant for both time delay and DOA estimations, with almost no performance loss compared with CRB.

关键词： Multiaccess communication Maximum likelihood estimation Delay estimation Delay effects Direction of arrival estimation Fading Interference Gaussian noise Computational complexity Performance analysis

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Differential transceiver design for DS-CDMA systems with transmit diversity

Differential transceiver design for DS-CDMA systems with tra...

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MILCOM, Military communications Conference

作者： Kun Wang 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)0780372255

The performance of new differential detection schemes with transmit diversity (TD) for direct-sequence code division multiple access (DS-CDMA) systems is evaluated. Two TD schemes are considered. One is the orthogonal transmit diversity (OTD) and the other is the space-time transmit diversity (STTD). To enable blind detection, the two schemes of differential encoding/decoding in combination with the minimum variance distortionless response (MVDR) receiver are proposed. Both schemes provide full spatial diversity and require no channel state information at the transmitter as well as the receiver. The performance of the proposed OTD+MV and STTD+MV transceivers are much better than that of the conventionally used OTD+MF (matched filter) and STTD+MF receivers. The STTD+MV outperforms the OTD+MV at the price of a higher receiver complexity.

关键词： Transceivers Multiaccess communication

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An MMSE receiver for asynchronous DS/CDMA in multipath fading channels -exact analytical evaluation

An MMSE receiver for asynchronous DS/CDMA in multipath fadin...

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Asilomar Conference on signals, Systems & computers

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

ISBN: (纸本)078037147X

An MMSE receiver for asynchronous DS/CDMA systems in multipath fading channels, using a single adaptive filter, is analyzed. This filter, which simultaneously combines multipath responses and suppresses multiple access interference (MAI), has an order equal to the sum of the processing gain of the CDMA system and the channel memory. The analytical results show that this approach provides significant advantages over a conventional RAKE receiver.

关键词： Multiaccess communication Fading Multiple access interference Delay Finite impulse response filter signal analysis Adaptive filters Multipath channels RAKE receivers Interference suppression

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A new predistorter design for nonlinear power amplifiers using the minimum distortion power polynomial model (MDP-PM)

A new predistorter design for nonlinear power amplifiers usi...

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IEEE Conference on Vehicular Technology (VTC)

作者： Haobo Lai Y. Bar-Ness Center for Communications and Signal Processing Research Department of Electrical Engineering New Jersey Institute of Technology Newark NJ USA

A new polynomial model for nonlinear power amplifiers (PA) was proposed by Lai and Bar-Ness (see IEEE Vehicular Technol. Conf., Amsterdam, the Netherlands, Sept. 1999) in their earlier work which takes into account both the input modulation format and the operating point of a PA. Such a model has been applied to analog predistorter (PD) design using a zero forcing scheme. In this paper, this model is applied to PD designs using the approach of approximating the ideal predistorter of the PA of interest. Based on the metric of the total degradation of a digital radio link with 64-QAM, the proposed PD has comparable performance of another PD obtained by the ideal approximation approach of D'Andrea, Lottici and Reggiannini (1996), but has less complexity in its implementation than the other one. In addition, based on the same metric, significant improvement is shown of the new PD over several PD designs using the zero forcing scheme, including the one proposed by Lai et al. However, the MDP-PM of the ideal PD has the same level of complexity as the PDs compared in the same order.

关键词： Power amplifiers Nonlinear distortion Polynomials Communication systems Power system modeling signal processing Electronic mail Modulation signal design Degradation

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A novel approach for increasing security and data embedding capacity in images for data hiding applications

A novel approach for increasing security and data embedding ...

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

作者： F. Alturki R. Mersereau Department of Electrical and Computer Engineering Center of Signal and Image Processing Georgia Institute of Technology Atlanta GA USA

ISBN: (纸本)0769510620

Data hiding in multimedia is the process of secretly embedding information into data sources such as image, video, or audio signals without changing the perceptual quality of the data source. We present a novel blind data hiding technique for hiding information in still images. This technique is based on embedding the information in the transform domain, after decorrelating the samples in the spatial domain. This results in a significant increase in the number of transform coefficients that can be used to transmit the hidden information. The technique is suitable for a variety of data hiding applications such as steganography, data authentication and captioning. The technique achieves a higher and more secure data embedding rate than existing data embedding transform domain techniques developed for these particular applications.

关键词： Data security Data encapsulation Decorrelation Information security signal processing Copyright protection Steganography Frequency Quantization Application software

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A simplified predistorter for compensation of nonlinear distortion in OFDM systems

A simplified predistorter for compensation of nonlinear dist...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： Sekchin Chang E.J. Powers Department of Electrical and Computer Engineering and Telecommunications and Signal Processing Research Center University of Texas Austin Austin TX USA

This paper presents a new simplified predistortion scheme to compensate nonlinear distortion introduced by the high power amplifier (HPA) in OFDM systems. OFDM systems are susceptible to HPA nonlinearities in particular because of their large peak-to-average power ratios. Previously, a Volterra-based predistorter was suggested for compensation of HPA's nonlinear distortion in OFDM systems. In contrast to this earlier work, our adaptive predistorter utilizes a more simplified structure. It is shown that the new simplified structure exhibits faster convergence than the previous Volterra-based predistorter. In addition, the performance of the new predistortion scheme for OFDM systems is evaluated in terms of total degradation, optimal output backoff, and BER. Simulation results also show that our predistortion scheme is more efficient in compensating the nonlinear distortion of HPAs in OFDM systems than the previous scheme.

关键词： Nonlinear distortion OFDM Predistortion Nonlinear filters Radio transmitters High power amplifiers Convergence Fluctuations Pulse shaping methods Pulse amplifiers

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A novel partial sampling MMSE receiver for uplink multicarrier CDMA

A novel partial sampling MMSE receiver for uplink multicarri...

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IEEE Conference on Vehicular Technology (VTC)

作者： Pingping Zong Kunjie Wang Y. Bar-Ness Center for Comm and Signal Processing Research CCSPR Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

In a regular multicarrier CDMA (MC-CDMA) receiver, timing of the starting point of the desired signal must be found with small error in order to demodulate correctly the information carried by different subcarriers. This requires a complicated timing acquisition for each user in the receiver of the uplink MC-CDMA system due to the randomness of delays. We remove this requirement for the uplink receiver by providing a method using partial sampling demodulation. The proposed partial sampling minimum mean square error (MMSE) receiver is shown to have stronger capability of both interference suppression and near-far resistance than that of a regular symbol receiver The proposed receiver can be implemented adaptively by using a least-mean-square (LMS) algorithm. A training sequence is required to achieve initial adaptation.

关键词： Sampling methods Multiaccess communication Multicarrier code division multiple access Timing Error correction Delay Demodulation Mean square error methods Interference suppression Least squares approximation

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A super-fast scanning technique study for an on-airport weather radar

A super-fast scanning technique study for an on-airport weat...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： K. Lai D. Longstaff G. Callaghan Cooperative Research Center of Sensor Signal and Information Processing Department of Computer Science and Electrical Engineering University of Queensland Brisbane QLD Australia

We assess the prospects for detecting a dry microburst core in the vicinity of an airport using a super-fast scanning (SFS) technique. In particular we propose a 20-beam SFS radar system and develop a system specification delivering a similar performance to a conventional mechanical scanning terminal Doppler weather radar (CMS-TDWR). The performance is compared in terms of the accuracy by which the three spectral moments can be estimated. These parameters were calculated using the signal models generally accepted by the industry for a microburst, for both scanning systems, and sampling at the same range intervals. The simulated results show that a 20-beam SFS X-band radar could update the weather information at twenty times the rate of the CMS-TDWR, but the radar would need a peak power of 45 kW. Whilst this peak power requirement is considerably less than the CMS-TDWR radar, this may be difficult to achieve for an electronically scanned array. The research emphasis is on developing and analysing the potential of the SFS technique, and this technique can be applied to improve the weather radar scanning rate once phased array radars of adequate peak power are feasible.

关键词： Meteorological radar Collision mitigation Space vector pulse width modulation Radar antennas Radar detection Phased arrays signal processing Information processing computer science Airports

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