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A high-speed residue-to-binary converter and a scheme for its VLSI implementation

A high-speed residue-to-binary converter and a scheme for it...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

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

In this paper, a high-speed residue-to-binary converter for the recently introduced moduli set (2/sup k/, 2/sup k/-1, 2/sup k-1/-1) is proposed. Compared to the previous converter based on this moduli set, the proposed one is 40% faster; also, the time-complexity product is improved by 20%. Following the VLSI design flow established by the Canadian Microelectronics Corporation, the proposed converter is implemented in 0.5-micron CMOS technology. Based on this moduli set, layouts of the 8-bit, 16-bit, 32-bit and 64-bit residue-to-binary converters which can be used in further RNS system designs, are generated and simulation results obtained.

关键词： Very large scale integration CMOS technology Cathode ray tubes Microelectronics signal processing Digital filters Information management

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A parallel residue-to-binary converter

A parallel residue-to-binary converter

引用

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

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

A high-speed parallel residue-to-binary converter is proposed for the moduli set S/sup k/={2/sup m/-1, 2/sup 2(0)m/+1, 2/sup 2(l)m/+1, L, 2.

关键词： Hardware Dynamic range signal processing Arithmetic Cathode ray tubes Concurrent computing Parallel processing Fault tolerant systems

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Design of least asymmetric compactly supported orthogonal wavelets via optimization

Design of least asymmetric compactly supported orthogonal wa...

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Canadian Conference on electrical and computer engineering (CCECE)

作者： Y. Zhao M.N.S. Swamy Centre for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

The compactly supported orthogonal wavelets have found wide applications in practice. A disadvantage of these wavelets is that they are not symmetric. Thus they do not have a linear phase which is a property often desired in some applications such as signal processing. In this paper, degrees of freedom are introduced in the design to minimize the asymmetry of the wavelets. The results indicate that the compactly supported orthogonal wavelets designed via optimization are much less asymmetric and have an approximate linear phase.

关键词： Design optimization Biomedical signal processing Linear approximation Finite impulse response filter Polynomials Application software signal denoising signal design Nonlinear distortion Phase distortion

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Adaptive admission policy for priority queue integrated CDMA networks

Adaptive admission policy for priority queue integrated CDMA...

引用

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

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.

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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Capacity-maximizing transmitter processing for fading matrix channels

Capacity-maximizing transmitter processing for fading matrix...

引用

Communication Theory Mini-Conference

作者： A. Reial S.G. Wilson Communications Control and Signal Processing Laboratory Department of Electrical Engineering University of Virginia Charlottesville VA USA

The performance potential of a wireless communications system employing antenna arrays is not fully utilized if equal energy allocation and uncorrelated symbols are used at all transmitters in the multichannel, cross-coupled system. Optimal, in the information-theoretic sense, transmitted signal covariance can be found by maximizing the end-to-end system capacity subject to an energy constraint. Performance evaluation of system outage capacity shows that optimal transmitter processing offers an SNR improvement potential up to several dB. The gains are most notable for systems with low SNR or many transmit antennas.

关键词： Transmitters Fading Covariance matrix Transmitting antennas Additive noise Gaussian noise Rician channels Process control Communication system control Array signal processing

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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...

引用

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 ...

引用

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

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

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Asilomar Conference on signals, Systems & computers

作者： J.M.A. Tanskanen V.S. Dimitrov 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

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.

关键词： Roundoff errors Polynomials Finite impulse response filter Design methodology Design engineering Power engineering and energy Degradation Nonlinear filters Filtering White noise

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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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Adaptive multishot canceler for the wideband CDMA systems

Adaptive multishot canceler for the wideband CDMA systems

引用

IEEE Conference on Vehicular Technology (VTC)

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

With the demand for high-capacity (multimedia) services, wideband CDMA (WCDMA) has become an attractive multiple access scheme for third-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 intersymbol 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 has 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 channel characteristics.

关键词： Wideband Multiaccess communication Delay Multiple access interference Intersymbol interference Multimedia systems Multiuser detection Hardware Particle separators Adaptive filters

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