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检索条件"主题词=adaptive algorithm"

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Receiver-oriented adaptive buffer allocation in credit-based flow control for ATM networks

Receiver-oriented adaptive buffer allocation in credit-based...

引用

IEEE Annual Joint Conference: INFOCOM, IEEE Computer and Communications Societies

作者： H.T. Kung Koling Chang Division of Applied Sciences Harvard university Cambridge MA USA

In credit-based flow control for ATM networks, a buffer is first allocated to each VC (virtual circuit) and then credit control is applied to the VC for avoiding possible buffer overflow. Receiver-oriented, adaptive buffer allocation allows a receiver to allocate its buffer dynamically, to VCs from multiple upstream nodes based on their bandwidth usage. The paper describes, in detail, such an adaptive algorithm capable of supporting a wide range of link speeds and propagation delays, and also packing multiple allocation and credit records in a single message. Analysis and simulation results show that even under highly bursty traffic, the adaptive scheme guarantees no cell loss due to congestion, and achieves excellent performance in utilization, fairness, ramp-up and packing, while requiring only relatively small node memory and bandwidth overhead. The required memory need only be 4*RTT+2*N, where RTT is the link round-trip time in cell cycles and N is the number of VCs.

关键词： Virtual colonoscopy Bandwidth Random access memory Circuits Buffer overflow adaptive algorithm Propagation delay Performance analysis Analytical models Traffic control

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adaptive buffer sizing for TCP flows in 802.11e WLANs

Adaptive buffer sizing for TCP flows in 802.11e WLANs

引用

International Conference on Communications and Networking in China (CHINACOM)

作者： Tianji Li Douglas Leith Hamilton Institute National University of Ireland Maynooth Ireland

We consider the provision of access point buffers in WLANs. We first demonstrate that the default use of static buffers in WLANs leads to either undesirable channel under-utilisation or unnecessary high delays, which motivates the use of dynamic buffer sizing. Although adaptive algorithms have been proposed for wired Internet, a number of fundamental new issues arise in WLANs which necessitates new algorithms to be designed. These new issues include the fact that channel bandwidth is time-varying, the mean service rate is dependent on the level of channel contention, and packet inter-service times vary stochastically due to the random nature of CSMA/CA operation. We propose an adaptive sizing algorithms which is demonstrated to be able to maintain high throughput efficiency whilst achieving low delay.

关键词： Delay Internet Throughput algorithm design and analysis Bandwidth Wireless LAN Telecommunication traffic adaptive algorithm Multiaccess communication Communication system traffic control

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LAPSES: a recipe for high performance adaptive router design

LAPSES: a recipe for high performance adaptive router design

引用

IEEE Symposium on High-Performance Computer Architecture

作者： A.S. Vaidya A. Sivasubramaniam C.R. Das Department of Computer Science and Engineering Pennsylvania State University University Park PA USA

Earlier research has shown that adaptive routing can help in improving network performance. However, it has not received adequate attention in commercial routers mainly due to the additional hardware complexity, and the perceived cost and performance degradation that may result from this complexity. These concerns can be mitigated if one can design a cost-effective router that can support adaptive routing. This paper proposes a three step recipe-Look-Ahead routing, intelligent Path Selection, and an Economic Storage implementation, called the LAPSES approach-for cost-effective high performance pipelined adaptive router design. The first step, look-ahead routing, reduces a pipeline stage in the router by making table lookup and arbitration concurrent. Next, three new traffic-sensitive path selection heuristics (LRU, LFU and MAX-CREDIT) are proposed to select one of the available alternate paths. Finally, two techniques for reducing routing table size of the adaptive router are presented. These are called meta-table routing and economical storage. The proposed economical storage needs a routing table with only 9 and 27 entries for two and three dimensional meshes, respectively. All these design ideas are evaluated on a (16/spl times/16) mesh network via simulation. A fully adaptive algorithm and various traffic patterns are used to examine the performance benefits. Performance results show that the look-ahead design as well as the path selection heuristics boost network performance, while the economical storage approach turns out to be an ideal choice in comparison to full-table and meta-table options. We believe the router resulting from these three design enhancements can make adaptive routing a viable choice for interconnects.

关键词： Routing Hardware Costs Degradation Pipelines Table lookup Mesh networks adaptive algorithm Telecommunication traffic Traffic control

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Optimization of multi-channel SAR data classification using genetic algorithms

Optimization of multi-channel SAR data classification using ...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： M. Habermeyer Deutsches Zentrum für Luft-und Raumfahrt e.V. Institut für Hochfrequenztechnik Wessling Germany

The classification of multi-channel SAR data can be divided into several sequential steps, each of which can be performed by different methods working on different parameter sets. In this work a technique is presented in order to optimize the selection of significant data and the following filtering, parameter extraction and classification operations on the data.

关键词： Genetic algorithms Information filtering Information filters Data mining Parameter extraction adaptive algorithm Optimization methods Probability Bayesian methods Stress

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Efficient algorithms for Context Query Evaluation over a Tagged Corpus

Efficient Algorithms for Context Query Evaluation over a Tag...

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Computer Science Society (SCCC) International Conference Chilean FLAGGED

作者： Jérémy Barbay Alex López-Ortiz Departamento de Ciencias de la Computación (DCC) Universidad de Chile Santiago Chile Cheriton School of Computer Science (CSCS) University of Waterloo Canada

We present an optimal adaptive algorithm for context queries in tagged content The queries consist of locating instances of a tag within a context specified by the query using patterns with preorder, ancestor-descendant and proximity operators in the document tree implied by the tagged content. The time taken to resolve a query Q on a document tree T is logarithmic in the size of T, proportional to the size of Q, and to the difficulty of the combination of Q with T, as measured by the minimal size of a certificate of the answer. The performance of the algorithm is no worse than the classical worst-case optimal, while provably better on simpler queries and corpora. More formally, the algorithm runs in time O(δk lg (n/δk)) in the standard RAM model and in time O(δk lg lg min(n, σ)) in the Θ(lg (n))-word RAM model, where k is the number of edges in the query, δ is the minimum number of operations required to certify the answer to the query, n is the number of nodes in the tree, and σ is the number of labels indexed.

关键词： Query processing XML Books Database languages Acquired immune deficiency syndrome Africa Computer science Read-write memory HTML adaptive algorithm

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Set-membership affine projection algorithm for echo cancellation

Set-membership affine projection algorithm for echo cancella...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： P.S.R. Diniz R.P. Braga S. Werner LPS-Signal Processing Laboratory COPPE/Poli-UFRJ Rio de Janeiro Brazil Amazonia Celular Brazil Signal Processing Laboratory Helsinki University of Technology Finland

This paper proposes a new data-selective affine projection algorithm for echo cancellation. The algorithm generalizes the concepts of the conventional set-membership affine-projection by incorporating a lower bound on the output error in order to prevent undesirable attenuation of the far-end signal. It is shown that the echo signal can more reliably be removed from the far-end user signals by employing the new algorithm in double talk situations. In addition, the proposed algorithm retains the fast convergence of the conventional SM-AP algorithm while keeping a reduced number of coefficient updates. Simulation results, using the ITU-T G.168 recommendation setup parameters, are presented in order to confirm the good features of the proposed algorithm

关键词： Projection algorithms Echo cancellers adaptive filters Computational complexity Error correction Estimation error Filtering Least squares approximation Resonance light scattering adaptive algorithm

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Basic Linear Filters in Extracting of Auditory Evoked Potentials

Basic Linear Filters in Extracting of Auditory Evoked Potent...

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International Symposium on Image and Signal Processing and Analysis

作者： Serap Aydin EEE Department University of Ondokuz Mayis Samsun Turkey

ISBN: (纸本)9531841160;97

The aim of this study is to assess the performance of additivity-based linear filtering techniques into two groups in extracting of auditory evoked potentials (EPs) from a relatively small number of sweeps. We named these groups as: Group A (the Wiener filtering (WF) and coherence weighted WF (CWWF) of orthogonal projections) and Group B (standard adaptive algorithms of Least Mean Square (LMS), Recursive Least Square (RLS), and one-step Kalman filtering (KF)). All methods are compared to the traditional ensemble averaging (EA) in simulations, pseudo-simulations and experimental studies based on the signal-to-noise-ratio (SNR) enhancement. We observed that the KF is the best methods among them. The filtering of the projections instead of the raw data improves the performance of filtering operations in both cases of the LMS and WF. The CWWF works better than the conventional WF when it is applied to the projections as well. In conclusion, most of the linear filters show definitely better performance compared to EA. The KF effectively reduce the experimental time (to one-fourth of that required by EA). The projection method so called Subspace Method (SM) in the current study is a useful pre-filter to significantly reduce the noise on the raw data. The use of the SM is revealed in auditory EP estimation. The SM improves the performance of different algorithms.

关键词： Nonlinear filters Wiener filter Filtering Samarium Least squares approximation Maximum likelihood detection adaptive algorithm Least squares methods Resonance light scattering Kalman filters

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Fractionally spaced semi-blind decision feedback equalization of wireless channels

Fractionally spaced semi-blind decision feedback equalizatio...

引用

IEEE International Conference on Communications (ICC)

作者： D. Pal Communications Sciences Research Division AT and T Bell Laboratories Inc. Holmdel NJ USA

A new procedure for identification and equalization of wireless channels is presented. The procedure is called semi-blind because it estimates the signal subspace blindly but gets trained on the phase. This technique converges very quickly and is very well suited for applications where the messages are short or the channel changes rapidly such that, e.g., every frame of a time division multiple access (TDMA) system would have to be equalized freshly. It may also be well suited for low SNR scenarios as compared to most equalizers. Unlike most other equalization procedures, this method of equalization works well for nonminimum phase channels also.< >

关键词： Decision feedback equalizers Time division multiple access Resonance light scattering Phase estimation Bit rate Wireless communication Fading Intersymbol interference adaptive algorithm Convergence

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Two signatures' codes linear decorrelator detector for CDMA systems

Two signatures' codes linear decorrelator detector for CDMA ...

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Wireless Telecommunications Symposium, WTS

作者： A.Y. Hassan A.M. Hassan A.F. Hussian Benha University Egypt Cairo University Egypt

Code Division Multiple Access (CDMA) is a widely used multiple access method in a lot of nowadays vital applications. The systems that are designed based on CDMA are suffering from multiple access interference (MAI) problem. A lot of CDMA detectors are designed to overcome the (MAI) problem. But as the capability of CDMA detector in (MAI) cancellation increases, the complexity of the detector increases too. This paper gives a proposal of a new linear CDMA detector that has the same multiple access interference (MAI) cancellation capability as CDMA decorrelator detector. The structure complexity of this new proposed detector is as simple as the matched filter detector structure. Solving the (MAI) problem in CDMA system with simple detector structure at the receiver helps on increasing the CDMA system capacity. The new proposed detector operation is based on the symmetry property of CDMA signatures' codes cross-correlation matrix.

关键词： Decorrelation Detectors Multiaccess communication Matched filters Multiple access interference adaptive filters Signal detection adaptive algorithm Proposals Interference cancellation

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GLMS adaptive alogrithm in linear prediction

GLMS adaptive alogrithm in linear prediction

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Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： B. Krstajic Z. Uskokovic L. Stankovic Electrical Engineering Department University of Montenegro Podgorica Yugoslavia

This paper proposes a new version of an adaptive LMS algorithm, based on a modified estimate of the performance function gradients. This modification leads to the GLMS (geometrically median LMS) adaptive algorithm. This algorithm causes smaller gradient noise into an adaptive filter, thus leading to more stable convergence of an adaptive process. This property makes the GLMS algorithm more stable and superior in some applications than the LMS algorithm. The convergence analysis of GLMS algorithm is also performed, and the comparative simulation results (with respect to the LMS algorithm) presented, confirming the mentioned advantages. GLMS turned out to be most suitable for prediction of a random signal with large Gaussian noise.

关键词： adaptive algorithm Least squares approximation Signal processing algorithms Convergence adaptive filters algorithm design and analysis adaptive systems Vectors Signal analysis Iterative algorithms

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