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Space-time receiver for multi-rate CDMA systems: multi-code and variable spreading length access methods comparison

Space-time receiver for multi-rate CDMA systems: multi-code ...

引用

IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

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

Linear space-time multiuser detectors are proposed for CDMA systems which support users transmitting at different bit rates. The performance of the LMMSE space-time dual-rate receiver is studied in the context of two multi-rate access methods: multi-code (MC) access where high data rate users multiplex information streams onto multiple codes, and variable spreading length (VSL) access where signature sequences of different lengths are assigned to users with different data rates. Simulation results show that the proposed LMMSE space-time dual-rate receiver can significantly enhance the multimedia services that can be provided by multi-rate CDMA systems, and the VSL access system offers a distinct advantage over the MC system.

关键词： Multiaccess communication Detectors Fading Multiple access interference Multimedia systems Data communication Multipath channels Receiving antennas signal processing Space technology

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Adaptive multishot canceler for wideband CDMA systems

Adaptive multishot canceler for 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 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 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 focused on algorithms which, due to high computational/hardware complexity, are unsuitable for large delay spread channels. 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.

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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Array processing and multishot separator for WCDMA uplink transmission

Array processing and multishot separator for WCDMA uplink tr...

引用

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

作者： Hernandez, Marco A. Bar-Ness, Y. Janssen, Gerard J.M. Prasad, Ramjee Delft University of Technology Electrical Engineering Department Mekelweg 4 2628 CD Delft Netherlands Center for Communications and Signal Processing Research New Jersey Institute of Technology University Heights Newark NJ United States

ISBN: (纸本)0780354354

In order to increase the capacity of WCDMA systems in the uplink while avoiding complexity, we investigate a space-time configuration by employing jointly beamforming and multishot multiuser separation. Such a joint structure provides a better bit error rate performance than either techniques used separately. Specifically, we propose a less complex space-time configuration, which is robust to Multiple Access Interference (MAI) over a frequency selective Rayleigh fading channel. We investigate the BER performance of the system by Monte Carlo simulations. The results obtained show that applying space-time processing using a simple beamforming and multishot separator can improve the performance of WCDMA systems considerably. © 1999 IEEE.

关键词： Beamforming

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

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

引用

Communication Theory Mini-Conference

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

The "Bootstrap" algorithm provides an efficient adaptive mult-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 article, 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： Convergence Stability analysis Multiaccess communication signal processing algorithms Detectors Matched filters Adaptive signal detection Multiuser detection Decorrelation Propagation delay

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The applications of the new Chinese Remainder Theorems for three moduli sets

The applications of the new Chinese Remainder Theorems for t...

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Canadian Conference on electrical and computer engineering (CCECE)

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, we apply the New Chinese Remainder Theorem I (New CRT-I) to design the residue-to-binary converters for all the recently introduced three moduli sets M/sub 1/={22/sup n/+1,2/sup n/+1,2/sup n/-1}, M/sub 2/={2/sup n/,2/sup n/-1,2/sup n-1/-1}. M/sub 3/={2/sup n/,2/sup n/+1,2/sup n/-1}, and M/sub 4/=(2n, 2n+1, 2n-1). For all these moduli sets, the converters based on the New CRT-I are consistently faster and require less hardware, compared to the previous residue-to-binary converters which are designed based on the traditional Chinese Remainder Theorem.

关键词： Cathode ray tubes Hardware Digital arithmetic Image converters Dynamic range Application software signal processing signal design Digital signal processing Fast Fourier transforms

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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...

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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 comprehensive study of three moduli sets for residue arithmetic

A comprehensive study of three moduli sets for residue arith...

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Canadian Conference on electrical and computer engineering (CCECE)

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

One important problem in residue arithmetic is the choice of modulo sets to represent the binary numbers in a certain range. In recent years, several general three-modulo sets have been introduced, and each of them is claimed to have some advantages. In this paper, we carry out a comprehensive study for all these modulo sets from the point of view of the hardware complexity and the speed of their residue-to-binary converters. Based on a performance evaluation of the VLSI implementation in terms of area and delay, we conclude that to represent 8-bit, 16-bit, 32-bit and 64-bit binary numbers, the set of moduli {2/sup n/-1, 2/sup n/, 2/sup n/+1} has the fastest residue-to-binary converter requiring the smallest area. The converter for this moduli set is designed based on the new Chinese remainder theorem of Y. Wang (1998).

关键词： Digital arithmetic Hardware Very large scale integration Delay signal processing Concurrent computing Digital signal processing Application software Fast Fourier transforms Digital filters

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A parallel residue-to-binary converter

A parallel residue-to-binary converter

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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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Joint transcoding of multiple MPEG video bitstreams

Joint transcoding of multiple MPEG video bitstreams

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

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

This paper addresses the problem of bit-rate conversion of a previously compressed video. We provide an MPEG joint transcoder for transcoding several video bitstreams simultaneously. We show that joint transcoding reduces the quality variation between multiple video sequences, as compared to independently transcoding each sequence at a fixed bit rate. Hence, joint transcoding results in a better utilization of the channel capacity. The joint transcoder can be used in a congested communication network as an alternative to data/packet dropping, and in applications which require multiplexing video signals onto a fixed communication channel such as video servers providing video on demand (VOD) service.

关键词： Transcoding Video compression Video on demand Transform coding Video sequences Bit rate Channel capacity Communication networks Communication channels Network servers

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