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检索条件"主题词=direct-sequence code-division multiple access"

共 535 条记录，以下是171-180 订阅

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Performance of MC CDMA systems in nakagami-m equivalent single-path fading channel

Performance of MC CDMA systems in nakagami-m equivalent sing...

引用

National Conference on Radio Science (NSRC)

作者： A.-A.A. Hashem S.M. Elnoubi H. Etmikati Alcatel Egypt Mobile Communications Group Egypt Alexandria University Alexandria Egypt

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Iimprovement of ultrasonic beacon-based local position system using multi-access techniques

Iimprovement of ultrasonic beacon-based local position syste...

引用

IEEE International Symposium on Intelligent Signal Processing

作者： J.M. Villadangos J. Urena M. Mazo A. Hernandez F. Alvarez J.J. Garcia C. De Marziani D. Alonso Electronics Dept. University of Alcalá. Polytechnics School Alcalá de Henares Madrid Spain Dept. of Electronics and Electromechanical Eng. University of Extremadura Spain

The present work shows a local positioning system (LPS) for mobile robots (MR) using simultaneous emissions in the ultrasonic beacons. In order to solve the problem of the simultaneous emission of the ultrasonic beacons, the well-known technique called direct sequence code division multiple access (DS-CDMA) is used. This technique modulates the ultrasonic signal (50 kHz) with a 127-bit Gold code for even beacon. In this way, it is possible to detect the arrival time of the code, by earning out the simultaneous correlations with the assigned codes to each beacon. For determining the absolute position, the triangulation technique uses the time difference-of-arrival (TDOA) obtained between a reference beacon and the others. Using this method, certain errors, derived from the delay in the firing of the beacons and the response times of the ultrasonic transducers, are avoided. The existence of a synchronism in the emission of the beacons, that guarantees a periodic and simultaneous emission in all of them, is required, not being necessary to know the emission instant in the mobile robot. This is particularly useful in environments where several robots can coexist

关键词： Mobile robots Gold Ultrasonic variables measurement Delay Ultrasonic transducers Frequency synchronization Position measurement Radio frequency direct-sequence code-division multiple access Multiaccess communication

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Blind Adaptive Successive Interference Cancellation using code-Constrained Constant Modulus Algorithms and Iterative Detection in Multipath Channels

Blind Adaptive Successive Interference Cancellation using Co...

引用

Asilomar Conference on Signals, Systems & Computers

作者： R.C. de Lamare R. Sampaio-Neto Communications Research Group Department of Electronics University of York York UK CETUC/PUC-RIO Rio de Janeiro Brazil

In this work we propose blind adaptive successive interference cancellation (SIC) receivers with iterative detection for direct sequence code division multiple access (DS-CDMA) systems in frequency selective channels. A code-constrained constant modulus (CCM) design criterion based on constrained optimization techniques is proposed for SIC detectors in scenarios subject to multipath and computationally efficient blind adaptive stochastic gradient (SG) and recursive least squares (RLS) algorithms are described for estimating the parameters of SIC detectors. A novel iterative detection scheme that generates different cancellation orders and selects the most likely symbol estimate on the basis of the instantaneous minimum constant modulus (CM) criterion is also proposed. Simulation results for an uplink scenario assess the algorithms, the proposed blind adaptive SIC detectors against existing receivers and evaluate the effects of error propagation of the new cancellations techniques

关键词： Interference cancellation Iterative algorithms Multipath channels Silicon carbide Detectors direct-sequence code-division multiple access Multiaccess communication Frequency conversion Algorithm design and analysis Interference constraints

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An efficient evolutionary algorithm for multiuser detection in CDMA systems

An efficient evolutionary algorithm for multiuser detection ...

引用

International Conference on Machine Learning and Cybernetics (ICMLC)

作者： Shao-Wei Wang Qiu-Ping Zhu Li-Shan Kang School of Electronic Information Wuhan University of China Wuhan China State Key Laboratory of Software Engineering Wuhan University of China Wuhan China

This paper introduces an adaptive ( /spl mu/ + /spl lambda/ ) evolutionary algorithm (EA) for multiuser detection (MUD) in direct sequence code division multiple access (DS-CDMA) systems. The EA based multiuser detector takes the output of parallel interference cancellation (PIC) detector as the initial population and adopts maximum likelihood decision rule to detect the user bit sequences. During an EA running, the offspring population size is adaptively adjusted according to the current success probability. The major advantage of the adaptive EA based multiuser detection scheme is that it obtains rather good bit error rate (BER) performance with lower computational complexity. Monte Carlo simulation results show the EA based multiuser detector can always converge to the optimal solution with a small number of generations. Numerical analysis shows its computational time is polynomial complexity and less than other heuristic search algorithms.

关键词： Evolutionary computation Multiuser detection Multiaccess communication Maximum likelihood detection Detectors Bit error rate direct-sequence code-division multiple access Interference cancellation Computational complexity Numerical analysis

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Blind adaptive and iterative algorithms for decision feedback DS-CDMA receivers in dispersive channels

Blind adaptive and iterative algorithms for decision feedbac...

引用

GLOBECOM '05. IEEE Global Telecommunications Conference, 2005.

作者： R.C. de Lamare R. Sampaio-Neto CETUC Catholic University of Rio de Janeiro Rio de Janeiro Brazil

In this paper we examine blind adaptive and iterative decision feedback (DF) receivers for direct sequence code division multiple access (DS-CDMA) systems in frequency selective channels. code-constrained minimum variance (CMV) and constant modulus (CCM) design criteria for DF receivers based on constrained optimization techniques are investigated for scenarios subject to multipath. Computationally efficient blind adaptive recursive least squares (RLS) algorithms are developed for estimating the parameters of DF detectors along with successive, parallel and iterative DF structures. A new successive parallel arbitrated DF scheme is presented and combined with iterative techniques for use with cascaded DF stages for mitigating the deleterious effects of error propagation. Simulations for an uplink scenario assess the new blind algorithms, DF structures and the effects of error propagation of the new techniques

关键词： Iterative algorithms Feedback Multiaccess communication Dispersion direct-sequence code-division multiple access Frequency conversion Constraint optimization Design optimization Concurrent computing Least squares approximation

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Asymptotic optimality of random PSK signature ensembles

Asymptotic optimality of random PSK signature ensembles

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IEEE International Symposium on Electromagnetic Compatibility and Electromagnetic Ecology

作者： A. Dudkov V. Ipatov Turku Center for Computer Science Department of Information Technology University of Turku Finland

Selection of a proper signature ensemble is the point of a special care in designing code division multiple access (DS CDMA) systems. When the receiver complexity beyond that of a single user algorithm is not affordable, Welch-bound ensembles minimizing intensity of the multiple access interference (MAI) are optimal. In this paper we show that for random signature sets the mean square deviation of MM power from the Welch bound drops in nearly inverse proportion with growth of K/N, where K is number of users and N is the spreading factor. Thereby, the fact of asymptotic (K/spl Gt/N) convergence in probability of random sets to the Welch-bound ones is demonstrated.

关键词： Phase shift keying multiple access interference Multiaccess communication Signal design Computer science Information technology direct-sequence code-division multiple access Quality of service Algorithm design and analysis Signal processing

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Analytical BER of an asynchronous DS-CDMA system in the 60 GHz channel

Analytical BER of an asynchronous DS-CDMA system in the 60 G...

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： R. Okouyi L. Clavier IEMN UMR CNRS 8520 GET/INT Villeneuve d'Ascq France

This paper presents the theoretical performance of an asynchronous wideband DS-CDMA system with as application the future 60 GHz indoor networks. We make an analytical study, separating the different noise sources of the communication link. We derive the error probability using the density probability function of the channel parameters in the case of an adapted filter and of a rake receiver. To validate the analytical study, we simulate the complete communication link using Monte Carlo simulation which takes into account the asynchronous character of the transmission. The results show a good agreement between the theoretical and simulation approaches and the feasibility of DS-CDMA for a 60 GHz high rate link

关键词： Bit error rate Multiaccess communication Diversity reception Fading Wideband Error probability Multipath channels Performance analysis Frequency direct-sequence code-division multiple access

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Performance analysis of a transform domain receiver for DS-CDMA systems

Performance analysis of a transform domain receiver for DS-C...

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International Conference on Communications, Circuits and Systems (ICCCAS)

作者： Shihai Shao Youxi Tang Wensheng Pan Shaoqian Li National Key Laboratory of Communications University of Electronic Science and Technology Chengdu China

ISBN: (纸本)0780390156

This paper describes a more generalized transform domain receiver for direct sequence code division multiple access (DS-CDMA) systems. The proposed receiver is motivated by the equivalence of the transmitted signal forms between DS-CDMA in the time domain and multicarrier CDMA (MC-CDMA) in the transform domain. Bit error rate (BER) performance with maximum ratio combining (MRC) of the receiver is obtained. Finally, compared with the conventional RAKE receiver, the BER performance in uplink channels with frequency-selective Rayleigh fading is shown by computer simulation.

关键词： Performance analysis Multiaccess communication Bit error rate RAKE receivers direct-sequence code-division multiple access Multicarrier code division multiple access Fading Multipath channels Frequency Rayleigh channels

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Signature-interleaved DS CDMA: controlling odd correlation peaks

Signature-interleaved DS CDMA: controlling odd correlation p...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： A. Dudkov V.P. Ipatov Turku Centre for Computer Science (TUCS) Department of Infornation Technology University of Turku Turku Finland

Users' asynchronism and multipath propagation are among the most problematic issues in designing direct sequence code division multiple access (DS CDMA) systems. In this paper a system employing interleaved multiple signatures per user to mitigate the damaging effects of these factors is described and studied. It is demonstrated that interleaving along with an appropriate selection of users' signature multitudes drastically lowers the level of data-modulation-related peaks of multiple access interference

关键词： Multiaccess communication multiple access interference Interleaved codes direct-sequence code-division multiple access Signal design Control systems Quality of service Algorithm design and analysis code division multiplexing Signal processing

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PLM-based channelization sequences for multi-code wideband DS-CDMA

PLM-based channelization sequences for multi-code wideband D...

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IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

作者： M. Khanfouci S. Marcos Laboratoire des signaux et systémes SUPELEC Gif-sur-Yvette France

A key problem in multi-code DS-CDMA communication systems is the limited resource in the code domain, i.e. limited number of available orthogonal channelization sequences. This problem causes the overall interference to be a limiting factor, especially when high symbol rate signaling is considered. In order to resolve this problem the literature has proposed many code management techniques, based essentially on code sharing mechanisms among the active users in the system. In this paper we propose a simpler method for the performance optimization of the multi-code DS-CDMA communication systems, based on the design of the channelization sequences used in the system. The optimal channelization sequences are implemented by means of chaotic piece wise linear Markov (PLM) sequences.

关键词： Wideband Multiaccess communication multiple access interference Chaotic communication code standards Communication standards Signal resolution Design optimization direct-sequence code-division multiple access Multimedia systems

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