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检索条件"机构=Center of Communications and Signal Processing Department of Electrical and Computer Engineering"

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A space-time receiver for asynchronous DS-CDMA systems based on Kalman filter

A space-time receiver for asynchronous DS-CDMA systems based...

引用

Asilomar Conference on signals, Systems & computers

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)0780365143

A new Kalman filter based space-time (S-T) receiver is proposed in this paper. By modeling an asynchronous CDMA system as a first-order state-space model, we can recursively obtain the finite-length linear minimum mean square error (LMMSE) receiver, which provides the best multiple access interference (MAI) cancellation among all the linear filters. Further interference suppression is provided by the spatial beam-former. The proposed receiver overcomes the near-far problem existing in the conventional joint S-T RAKE receiver. Simulation results demonstrate that the proposed Kalman filter based S-T receiver significantly outperforms the conventional joint S-T RAKE receiver.

关键词： Multiaccess communication Fading Multipath channels RAKE receivers Detectors Interference suppression Filters signal to noise ratio signal processing Multiple access interference

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The prediction MMSE receiver for joint multiple-access and narrow-band interference suppression in DS/CDMA channels

The prediction MMSE receiver for joint multiple-access and n...

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IEEE International Conference on communications (ICC)

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

A new MMSE receiver, which is termed prediction MMSE (PMMSE) receiver, is proposed for joint multiple-access and narrow-band interference suppression in asynchronous DS/CDMA systems. Numerical results indicate that th... 详细信息

关键词： Narrowband Interference suppression Multiple access interference Multiaccess communication Delay Finite impulse response filter Covariance matrix Gaussian noise signal processing Performance analysis

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An area-time-efficient residue-to-binary converter

An area-time-efficient residue-to-binary converter

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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： Wei Wang M.N.S. Swamy M.O. Ahmad Centre for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

In this paper, a new residue-to-binary conversion algorithm, that reduces the size of modulo operation required by the Chinese remainder theorem, is introduced. Based on this algorithm, an efficient residue-to-binary converter is proposed for a general residue number system. The proposed converter achieves a significantly better performance in terms of area, time, and power consumption than existing devices. For the case of the 28-bit dynamic range, the proposed converter is about 20% faster while requiring only 70% of the area, compared to the best existing converter (Srikanthan et al, IEE Proc. Comput. Digit. Tech., vol. 145, no. 3, pp. 229-235, 1998). Also, the power consumption is reduced by 16% in high speed situations and 50% in low voltage situations.

关键词： signal processing algorithms Energy consumption Very large scale integration Cathode ray tubes Low voltage Dynamic range Digital signal processing Algorithm design and analysis Arithmetic

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Joint bit-allocation for MPEG encoding of multiple video sequences with minimum quality-variation

Joint bit-allocation for MPEG encoding of multiple video seq...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： H. Sorial W.E. Lynch A. Vincent Centre for Signal Processing and Communications Department of Electrical & Computer Engineering Concordia University Montreal QUE Canada

This paper addresses the problem of multi-program video transmission over a single communication channel. We present a joint bit-allocation for MPEG encoding of multiple video sequences with a minimum quality-variation. The proposed method uses a picture-complexity measure based on the actual coding distortion in encoded frames, then allocates accordingly the available bits to explicitly reduce the variation in quality between the sequences. We compare the performance of the proposed method to independent encoding of the sequences at constant bit rates and to encoding with a joint bit-allocation scheme that uses a TM5-like picture-complexity measure. Results show that the proposed bit-allocation method is superior in terms of minimizing the quality variation between the video sequences and within the individual sequences. The method also provides better minimum picture quality than the other encoding schemes mentioned above. Applications of the joint bit-allocation method include multi-program transmission such as video on demand (VOD) services and digital TV broadcasting.

关键词： Encoding Video sequences Telecommunication control Communication channels Bit rate Video on demand Layout Bandwidth Streaming media Equations

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Blind adaptive asynchronous CDMA multiuser detector using prediction least mean kurtosis algorithm

Blind adaptive asynchronous CDMA multiuser detector using pr...

引用

IEEE Workshop on Statistical signal and Array processing

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 University Heights Newark NJ USA

ISBN: (纸本)0780359887

In this paper, a new blind adaptive multiuser detector, which is termed the prediction least mean kurtosis (PLMK) algorithm, is proposed for joint MAI and narrowband interference (NBI) suppression in asynchronous CDMA systems. This algorithm is based on higher-order statistics rather than the second-order statistics used in the LMS algorithm. Unlike the regular least mean kurtosis (LMK), it takes into consideration samples earlier than those corresponding to the current bit. For comparison purposes, we also apply the regular LMK algorithm to the case of asynchronous CDMA systems. Simulation results show that the blind adaptive multiuser detector with PLMK algorithm provides significantly better performance than the one with regular LMK algorithm.

关键词： Multiaccess communication Detectors signal processing algorithms Higher order statistics Interference suppression Least squares approximation Filters Adaptive signal detection Narrowband Multiple access interference

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Estimating Laplacian parameters of DCT coefficients for requantization in the transcoding of MPEG-2 video

Estimating Laplacian parameters of DCT coefficients for requ...

引用

IEEE International Conference on Image processing

作者： H. Sorial W.E. Lynch A. Vincent Centre for Signal Processing and Communications Department of Electrical & Computer Engineering Concordia University Montreal QUE Canada Communications Rcscarch Centre Ottawa ONT Canada

ISBN: (纸本)0780362977

This paper addresses the bit-rate reduction of MPEG-2 compressed video and presents a method to reduce requantization errors in transcoding. The proposed method assumes Laplacian distributions for the original AC coefficients of the DCT. A Laplacian parameter for each coefficient is estimated at the transcoder from the quantized input DCT coefficients. These parameters are then used in requantization to improve the quality of the transcoded video. The algorithm provided in this paper to estimate the Laplacian parameters of the original DCT coefficients is simple to implement and may be adapted to other DCT-based coding schemes.

关键词： Parameter estimation Laplace equations Discrete cosine transforms Transcoding Video compression Transform coding Bit rate signal processing algorithms Delay Cost function

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Blind estimation of frequency offset in OFDM systems using a nonlinear adaptive filter

Blind estimation of frequency offset in OFDM systems using a...

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MILCOM, Military communications Conference

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

ISBN: (纸本)0780365216

Orthogonal frequency division multiplexing (OFDM) is a possible candidate for high-rate data transmission in wireline and wireless communications. However, OFDM systems are very sensitive to frequency offset due to Doppler shifts and carrier synchronization errors. This sensitivity causes the system performance to degrade drastically. Therefore, in this paper we propose a blind estimation based an a nonlinear Volterra adaptive filter to estimate and compensate the frequency offset. The results show a significant performance improvement when using the scheme presented in this paper.

关键词： Frequency estimation Adaptive filters Doppler shift Bit error rate AWGN Degradation OFDM modulation Bandwidth Nonlinear filters Discrete Fourier transforms

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Cancellation of inter-carrier interference in OFDM systems using a nonlinear adaptive filter

Cancellation of inter-carrier interference in OFDM systems u...

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IEEE International Conference on communications (ICC)

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

Orthogonal frequency division multiplexing (OFDM) is a method suitable for high-rate data transmission in wireline and wireless communications. However, it is very sensitive to frequency offset due to Doppler shifts and carrier synchronization errors. This frequency offset results in inter-carrier interference (ICI) and, as a result, the performance of the OFDM system degrades drastically. Consequently, it, is necessary to remove as many ICI effects as possible to achieve the desired OFDM system performance. Therefore, in this paper, we propose a new method based on a nonlinear adaptive filter to suppress these ICI effects. In addition to showing that the ICI effects can be reduced significantly, the results also demonstrate that the nonlinear filter scheme is superior to the conventional linear filter.

关键词： Interference cancellation OFDM Nonlinear filters Data communication Wireless communication Doppler shift Frequency synchronization Degradation System performance Adaptive filters

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A new estimation scheme for frequency and timing offsets in OFDM systems

A new estimation scheme for frequency and timing offsets in ...

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IEEE Conference on Vehicular Technology (VTC)

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

Orthogonal frequency division multiplexing (OFDM) is a possible candidate for high-rate data transmission in wireline and wireless communications. However, OFDM systems are very sensitive to frequency and timing offsets. The sensitivity causes the system performance to degrade drastically. Therefore, in this paper we propose a new estimation scheme for frequency and timing offsets in OFDM systems. This estimation is based on an ambiguity function. Simulation results show that frequency and timing offsets are estimated very accurately using our presented method.

关键词： Frequency estimation Timing Degradation Doppler shift Bandwidth OFDM modulation Wireless sensor networks Interference Frequency synchronization Power engineering computing

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Non-stationary interference exciser in smart antenna systems using an adaptive Gabor expansion

Non-stationary interference exciser in smart antenna systems...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Jaehak Chung Sang-Youb Kim E.J. Powers Department of Electrical and Computer Engineering and Telecommunications and Signal Processing Research Center University of Texas Austin Austin TX USA

Since smart antenna systems which employ spread spectrum methods are sensitive to a time-correlated non-stationary jammer precise excision of the jammer is required. To remove this non-stationary jammer, we propose, a new adaptive Gabor jammer exciser, which can track optimally the change of the time and frequency densities of the jammer. To find the optimum time-frequency Gabor expansion for the received signal, we utilize the optimum projection method. In the time-frequency Gabor domain, we remove the non-stationary jammer with a constant false alarm rate, and reconstruct the jammer-removed signal from the remaining Gabor coefficients. This approach exhibits better performance than the non-optimized Gabor transform exciser.

关键词： Interference Adaptive arrays Adaptive systems Jamming Time frequency analysis Antenna arrays Phased arrays Transmitting antennas Receiving antennas signal resolution

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