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Probabilistic model for path delay fault testing

Journal of Information Science and engineering 2000年第5期16卷 783-794页

作者： Su, Chih-Yuang Wu, Cheng-Wen Department of Electrical Engineering National Tsing Hua University Hsinchu 300 Taiwan National Taiwan University National Tsing Hua University Department of Electrical Engineering National Tsing Hua University National Taiwan University Taipei Taiwan University of California Santa Barbara CA United States Chinese Nav. Petty Officers' Sch. C. Tsoying Taiwan Information Processing Center Bureau of Environmental Protection Executive Yuan Taipei Taiwan Ctr. for Compl. Sci. and Engineering UCSB Department of Electrical Engineering National Tsing Hua University Hsinchu Taiwan Computer and Communications Center Technology Service Center CIEE IEEE

Testing path delay faults (PDFs) in VLSI circuits is becoming an important issue as we enter the deep submicron age. However, it is difficult in general since the number of faults is normally very large and most faults are either hard to sensitize or are unstable. In this paper, we propose a probabilistic PDF model. We investigate probability functions for the wire and path delay size to model the fault effect in the circuit under test. In our approach, the delay fault size is assumed to be randomly distributed. An analytical model is proposed to evaluate the PDF coverage. We show that the delay sizes of the untested paths are actually reduced if these paths are conjoined with other tested good paths. Therefore, using our approach, path selection and synthesis of PDF testable circuits can be done more accurately. Also, given a test set, more accurate fault coverage can be predicted by calculating the mean delay of the paths.

关键词： Integrated circuit testing

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Adaptive multishot canceler for wideband CDMA systems

Adaptive multishot canceler for wideband CDMA systems

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IEEE VTS 50th Vehicular Technology Conference, VTC 1999-Fall

作者： Tang, Xin Bar-Ness, Y. Van Waes, N.J.M. Center for Communications and Signal Processing Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ 07102 United States

ISBN: (纸本)0780354354

With the demand for high capacity (multimedia) services, wideband CDMA (WCDMA) has become an attractive multiple access scheme for 3rd generation wireless systems. Coming with higher data rate, the application of WCDMA brings with it new challenges in terms of multiple access interference (MAI) and inter-symbol interference (ISI) suppression due to the fact that compared to the 'regular' CDMA, the delay spread is no longer only a few chips. Most of the literature on multiuser detection so far focused on algorithms which, due to high computational/hardware complexity, are unsuitable for large delay spread channels. In this paper, we present an adaptive symbol-based signal separator based on multishot matched filtering which is suitable for the asynchronous large delay spread fading channels characteristics. © 1999 IEEE.

关键词： Multiple access interference

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Convergence and stability analysis of the adaptive " Bootstrap" CDMA multi-user detector 8

Convergence and stability analysis of the adaptive " Bootstr...

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8th IEEE communications Theory Mini-Conference

作者： Lee, Cheng-Chou Bar-Ness, Yeheskel Center for Communications and Signal Processing Research Department of Electrical and Computer Engineering New Jersey Institute of Technology NewarkNJ07102 United States

ISBN: (纸本)0780356535

The "Bootstrap" algorithm provides an efficient adaptive multi-user detection approach to solve the near-far problem in CDMA communication systems. The weight vectors are controlled by a simple decorrelation scheme which minimizes the correlation between their outputs and the hard limited version of the other outputs, respectively. It has been shown that the "Bootstrap" algorithm provides performance similar to that of MMSE with low complexity. In this work, the convergence and stability of the "Bootstrap" algorithm is considered. Sufficient conditions for the code cross-correlation and the step size are provided.

关键词： Multiuser detection

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Adaptive admission policy for priority queue integrated CDMA networks 1

Adaptive admission policy for priority queue integrated CDMA...

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1st IEEE Annual Wireless communications and Networking Conference, WCNC 1999

作者： Baroudi, U.A. Elhakeem, A.K. Center for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University MontrealQCH3G 1M8 Canada

ISBN: (纸本)0780356683

This paper investigates the performance of a new adaptive call admission policy based on a window-measurement estimation of the status of the buffer at the base station where two classes of customers (voice and data) are multiplexed into L servers. In this work, we interrelate physical limitations of the base stations (i.e., the number of transmission and reception modems), call and burst level traffic, instantaneous ATM buffer conditions, and end-to end bit error performance. Considering these parameters, we combine them all in one queueing problem and devise a new hybrid congestion based call admission policy. This policy is investigated in conjunction with CDMA integrated networks utilizing the IS-95 transmission/reception platforms. The results show that the proposed policy does maintain the QoS required for the networks under expected traffic load. © 1999 IEEE.

关键词： Base stations

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Round-off error free fixed-point design of polynomial FIR predictors 33

Round-off error free fixed-point design of polynomial FIR pr...

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33rd Asilomar Conference on signals, Systems, and computers, ACSSC 1999

作者： Tanskanen, J.M.A. Dimitrov, V.S. Institute of Intelligent Power Electronics Department of Electrical and Communications Engineering Helsinki University of Technology Espoo Finland Laboratory of Signal Processing and Computer Technology Department of Electrical and Communications Engineering Helsinki University of Technology Espoo Finland

ISBN: (纸本)0780357000

We present a novel method for designing polynomial FIR predictors for fixed-point environments. Our method yields filters that perform exact prediction of polynomial signals even with short coefficient word lengths. Under ordinary coefficient truncation or rounding, the prediction capability degrades, or may be totally lost. With the proposed method, the filters are designed so that the predictive properties are exactly preserved in fixed-point implementations. The proposed filter design method is based on integer programming (IP) and can be directly applied to any fixed-point FIR design specifications which can be formulated in a form of linear constraints on the filter coefficients. © 1999 IEEE.

关键词： Polynomials

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Minimum distortion power polynomial model (MDP-PM) of nonlinear power amplifiers and its application on analog predistorters

Minimum distortion power polynomial model (MDP-PM) of nonlin...

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IEEE VTS 50th Vehicular Technology Conference, VTC 1999-Fall

作者： Lai, Haobo Bar-Ness, Y. Center for Communications and Signal Processing Research Department of Electrical Engineering New Jersey Institute of Technology Newark NJ 07102-1982 United States

ISBN: (纸本)0780354354

With the increasing demands of power efficiency and linearity on power amplifiers (PAs), there are more and more demands for some new and easy modeling methods of PA nonlinearities. One direction of these trends is to get better polynomial models which are extensively used in the design of analog predistorters(PDs) to combat nonlinearity and in the estimation of the intermod-ulation products for PAs. Because of the difficulty in modeling a PA and for ease of comparison, most of the polynomial models reported in the literature are based on a simple TWTA model(Saleh's model) instead on actual PA devices. In this paper, we propose a method for obtaining a general order polynomial model from an existing model such as Saleh's model, or from the input-output statistical characteristics of a PA device. We also obtain the analytical representation of its coefficients. The method is based on minimizing the power of the distortion between the output of a PA and the output of the model based on it. Thus the model is named as minimum distortion power polynomial model(MDP-PM). We have obtained the coefficients of the proposed MDP-PMs up to order 7 based on Saleh's model to illustrate our results. Then we show the application of this model in analog PD designs, whereas the resulted PD devices outperform those given in the literature by 0.8db for order 3 and by 0.2db for order 5. © 1999 IEEE.

关键词： Power amplifiers

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Adaptive admission policy for priority queue integrated CDMA networks

Adaptive admission policy for priority queue integrated CDMA...

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IEEE Conference on Wireless communications and Networking

作者： U.A. Baroudi A.K. Elhakeem Center for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

关键词： Multiaccess communication Traffic control Base stations Telecommunication traffic Poisson equations Adaptive signal processing Electronic mail Modems Asynchronous transfer mode Fading

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Performance of multi-code CDMA systems with concatenated coding and iterative decoding in multipath Rayleigh fading channels

Performance of multi-code CDMA systems with concatenated cod...

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IEEE Conference on Vehicular Technology (VTC)

作者： D.N. Kalofonos E. Kurtas J.G. Proakis Communications and Digital Signal Processing Center Electrical and Computer Engineering Department Northeastern University Boston MA USA

Multi-code CDMA (MC-CDMA) is proposed as an alternative multiple access scheme which provides the flexibility, high data rates, and bandwidth-on-demand features necessary in next-generation wireless integrated services networks. In a conventional MC-CDMA configuration (e.g., in IS-95B) a user can transmit information in multiples (M times) of a basic data rate by using M orthogonal supplemental DS-CDMA channels. In this paper, motivated by the remarkable performance of turbo codes with large interleaving lengths in AWGN channels, we investigate the performance of a MC-CDMA system employing different concatenated encoding schemes combined with iterative decoding. Furthermore, we examine the frame error rate performance of the various schemes by considering CRC codewords in each of the M frames corresponding to each data block. We show that coding and interleaving at the block level improves the block error rate (BlER) performance, especially when turbo schemes are used, while the extra CRC overhead is beneficial mainly when convolutional codes are used.

关键词： Multiaccess communication Concatenated codes Multicarrier code division multiple access Interleaved codes Error analysis Cyclic redundancy check Next generation networking Intserv networks Turbo codes AWGN channels

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Multiple-antenna diversity techniques for transmission over fading channels

Multiple-antenna diversity techniques for transmission over ...

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IEEE Conference on Wireless communications and Networking

作者： B.A. Bjerke J.G. Proakis Communications And Digital Signal Processing Center Department of Electrical And Computer Engineering Northeastern University Boston MA USA

We consider wireless communication systems that employ multiple transmitting and receiving antennas to achieve spatial diversity and to increase the data rate through fading channels. In particular, we focus on a system with N transmitting antennas and M receiving antennas. We consider the design and performance evaluation of several detection algorithms for recovering the original data from the received signals on the M antennas. These algorithms include the optimum maximum likelihood detector and suboptimal reduced-complexity detectors such as the MMSE detector and a detector based on maximal ratio combining. We also consider coded systems.

关键词： Fading Maximum likelihood detection Receiving antennas Detectors Diversity reception Transmitting antennas Wireless communication signal design Algorithm design and analysis Detection algorithms

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Performance comparisons of concatenated codes with iterative decoding for DS-CDMA systems with application to IS-95-based cellular systems

Performance comparisons of concatenated codes with iterative...

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IEEE Conference on Wireless communications and Networking

作者： D.N. Kalofonos E. Kurtas J.G. Proakis Communications and Digital Signal Processing (CDSP) Center Electrical and Computer Engineering Department Northeastern University Boston MA USA

The remarkable performance of turbo codes for low SNRs in AWGN channels has encouraged the application of turbo codes to systems operating in different kind of channels. In this paper we consider an IS-95-based CDMA system operating in a multipath Rayleigh fading channel. We replace the convolutional encoder by a parallel and a serial turbo encoding scheme, and by a serial concatenation of an outer convolutional and an inner parallel turbo code, and instead of the Viterbi decoder we use iterative decoding based on the MAP algorithm. We perform BER and FER comparisons by varying system parameters such as the constraint length of the component convolutional codes, the interleaver lengths, and the wireless channel fading rate. The results obtained show that the concatenated schemes outperform the more complex convolutional scheme even for relatively short interleaving lengths, especially when FER is the desired figure of merit.

关键词： Concatenated codes Convolutional codes Turbo codes Fading Iterative decoding AWGN channels Multiaccess communication Viterbi algorithm Iterative algorithms Bit error rate

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