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检索条件"主题词=adaptive coding"

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Minimax Redundancy for Sources with an Unknown Model

Minimax Redundancy for Sources with an Unknown Model

引用

IEEE International Symposium on Information Theory

作者： J. Suzuki College of Science and Engineering Aoyama Gakuin University Tokyo Japan

This paper describes the construction of a universal code for minimizing L.D. Davisson's minimax redundancy in a range where the true model and stochastic parameters are unknown.

关键词： Minimax techniques Stochastic processes Educational institutions Probability distribution adaptive coding Statistics Learning systems

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A scalable architecture for active networks

A scalable architecture for active networks

引用

IEEE Conference on Open Architectures and Network Programming

作者： R. Sivakumar Sung-Wook Han V. Bharghavan Coordinated Science Laboratory University of Illinois Urbana-Champaign USA

Explores the network-level issues that deal with the organization, interaction and deployment of active routers in a network. We have identified and answered four sets of questions: (i) Where should active routers be placed in the network? What is the network organization of active routers that achieves a good tradeoff between scalability and flexibility? (ii) If all routers in the network are not active, then how can we abstract the state of the "non-active" portion of the network for services that reside in active routers? (iii) How do active routers discover and communicate with other active routers? What is the infrastructure for the management, discovery and communication of active routers? (iv) How do users discover the available (third-party) active services in the network? What is the infrastructure for the dissemination, discovery and composition of active services? We present a network organization of active routers and describe two key network-level constructs-the equivalent link abstraction and the spine network management infrastructure-that enable the deployment of a scalable and flexible active network. We finally present some preliminary simulation and implementation results to demonstrate the efficacy of the proposed architecture.

关键词： Scalability adaptive coding Quality of service

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Burst control

Burst control

引用

Joint IST Symposium on Mobile Future, and the Symposium on Trends in Communications, SympoTIC

作者： A. Chodorek R.R. Chodorek Department of Telecommunications and Photonics Kielce University of Technology Kielce Poland Department of Telecommunications AGH University of Science and Technology Krakow Poland

In multipurpose, multiservice network, real-time data (e.g. video over RTP) are transmitted in the same link with bulk data (e.g. ftp over TCP). Although real-time transmission usually doesn't occupy the whole link capacity, competing TCP stream typically collapses and achieves significantly lower throughput. TCP-tolerance is a behaviour of a real-time transport protocol, which allows TCP to utilize bandwidth unoccupied by the realtime transmission. In the paper burst control mechanism for TCP-tolerant transmission is proposed. The mechanism assures avoidance of TCP congestion collapse when competing with real-time transinission, but does not allow for transmission rate reduction when congestions appear. The congestion avoidance itself should be performed using one of the typical architectures of congestion avoidance for real-time transmission (e.g. receiver-driven layered multicast). Simulational analysis shows, that burst control effective protects real-time characteristics of the inelastic, multimedia traffic and allows TCP to utilize bandwidth unoccupied by real-time multimedia transmission much better than without burst control.

关键词： Streaming media Bit rate Bandwidth Video sharing Throughput Transport protocols adaptive coding Telecommunication control Photonics Analytical models

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On predictive least squares filtering

On predictive least squares filtering

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Tie-Jun Shan Information Systems Laboratory University of Stanford Stanford CA USA

In this paper, a class of filters based on the Predictive Least Squares principle recently suggested by Rissanen are proposed and studied. The proposed filtering technique provides a consistent estimate of the number of parameters for a Gaussian regression model while still minimizing the accumulated least squares error. Thus, the proposed filters combine model estimation and parameter estimation to provide optimal prediction and estimation. The proposed Predictive Least Squares filtering has potential application for adaptive coding, spectrum estimation, harmonic retrieval and many other digital signal processing areas.

关键词： Least squares methods Filtering Least squares approximation Parameter estimation Predictive models adaptive filters Digital filters adaptive coding Spectral analysis Power harmonic filters

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Capacity autocorrelation characteristic of distributed MIMO systems in Doppler spread channels

Capacity autocorrelation characteristic of distributed MIMO ...

引用

International Conference on Mobile Technology, Applications and Systems, MOBILITY

作者： D. Tang G.C. Zhang J.Y. Qin Sun Yat-sen University Guangdong China

In order to decrease the feedback complexity of distributed MIMO system, we consider a simplified feedback, the capacity autocorrelation information (CAI) feedback, and investigate the CAI characteristics in this paper. Results show that the CAI, which can be fed back to the transmitter for adaptive coding and modulation, can be simply predicted by the channel autocorrelation in the distributed MIMO system, which results in even less complexity in the calculation of the feedback information

关键词： Autocorrelation MIMO Feedback Computer aided instruction Base stations Transmitters Large-scale systems Rayleigh channels Antenna feeds adaptive coding

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Single sided MPI implementations for SUN MPI

Single sided MPI implementations for SUN MPI

引用

Supercomputing Conference

作者： S. Booth E. Mourao EPCC University of Edinburgh Edinburgh UK

This paper describes an implementation of generic MPI-2 single sided communications for SUN-MPI. Our implementation is layered on top of point-to-point MPI communications and therefore can be adapted to other MPI implementations. The code is designed to co-exist with other MPI-2 single sided implementations (for example direct use of shared memory) providing a generic fall-back implementation for those communication paths where an optimised single-sided implementation is not available. MPI-2 single sided communications require the transfer of data-type information as well as user data. We describe a type packing and caching mechanism used to optimise the transfer of data-type information. The performance of this implementation is measured in comparison to equivalent point to point operations and the shared memory implementation provided by SUN.

关键词： Sun Protocols Application software Software libraries Communication standards Buildings Design optimization Message passing adaptive coding Data structures

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Generalized Index Modulation System and Application for Satellite Communications

Generalized Index Modulation System and Application for Sate...

引用

Novel Intelligent and Leading Emerging Sciences Conference (NILES)

作者： Khaled A. Ghorib Amr Abdelaziz Ahmed F. Darwesh Yahya Mohasseb Dept. of Communication Engineering Military Technical College Cairo Egypt Dept. of Computer Engineering Arab Academy for Science Technology and Maritime Transport Cairo Egypt

ISBN: (数字)9798350378511

ISBN: (纸本)9798350378528

The generalized index modulation (G-IM) technique provides an improvement in bit error rate (BER), spectral efficiency (SE), and/or energy efficiency (EE) over traditional digital modulation schemes. However, G-IM techniques suffer from the propagation of errors due to the incorrect detection of indices for higher modulation order (M > 4). To alleviate the risk of error propagation, the enhancement of the correct indices detection probability is a crucial requirement for G-IM systems. This paper presents an error propagation-free generalized index modulation (G-IM) system with adaptive coding modulation in which the indices bits are coded independently on the information bits. The main focus of this study is to derive a quantitative relation between the target system BER and the required indices error rate and, hence, to derive the overall system error probability. In particular, an analytical total BER formula for the error propagation-free G-IM system is provided and compared to the total BER of the classical counterpart modulation techniques. Hence, a direct relationship between the BER of index bits and the ordinary modulation BER is represented, providing an approximate threshold after which the target BER of the G-IM system outperforms the traditional modulation techniques. To validate our established results, the G-IM system with low density parity check code with binary phase shift keying modulation technique (LDPC-BPSK), as a simple satellite coding-modulation scheme which is used in satellite digital video broadcasting TV (DVB-T2) and deep-space communications, is described as a possible direct application for the G-IM system. once the index BER exceeds the threshold, the LDPC-BPSK modulated G-IM system significantly outperforms the classical BPSK modulation while keeping the same EE or SE yet on the expense of added encoder complexity. Moreover, once the index error tends to the zero point, the total G-IM BER reaches its lower limit, a 3 dB gain, thanks t

关键词： Technological innovation TV Spectral efficiency Bit error rate Satellite broadcasting Modulation Binary phase shift keying Indexes Digital video broadcasting adaptive coding

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Novel IP Encapsulation and Burst Format Optimization for the Return Link of Interactive Satellite Systems

Novel IP Encapsulation and Burst Format Optimization for the...

引用

IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference

作者： R. Rinaldo T. Flo B. Rislow Ø. Weum H. P. Lexow J. Tousch ESA-ESTEC European Space Agency Noordwijk Netherlands Thrane and Thrane Billingstad Norway STM Norway Lysaker Norway Turbo Concept SAS Plouzane France

A number of novel physical layer techniques, and in particular adaptive coding and modulation (ACM) combined with high order modulations, have shown the potential to significantly improve throughput of current return link (RL) broadband access satellite systems. However, their introduction shall be complemented by novel concepts at MAC and network layer, which aim at increasing flexibility and maximizing actual achieved system efficiency, In this paper a novel frame and burst format is proposed, capable of ensuring high overall efficiency combined with radio resource management (RRM) simplicity. A comprehensive cross-layer optimization is carried out through simulation and numerical assessment in order to optimize burst lengths taking into account physical layer performances and network traffic profiles. Moreover, a novel encapsulation protocol (generic stream encapsulation-GSE) is considered to further improve IP transport efficiency.

关键词： Encapsulation Satellite broadcasting Physical layer Modulation coding adaptive coding Throughput Resource management Numerical simulation Telecommunication traffic Traffic control

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Fade Dynamic Characteristics on Olympus 12.5 GHz Link

Fade Dynamic Characteristics on Olympus 12.5 GHz Link

引用

European Conference on Microwave

作者： Francesco Barbaliscia Renzo Perfetti Fondazione Ugo Bordoni Rome Italy

First data from the propagation experiments with the Olympus satellite have been analyzed at 12.5 GHz in Rome for a 18 months period, on an event basis. The dynamic characteristics of the attenuation due to rain are examined to extract the design figures for those communication systems making use of allocation of countermeasures on a dynamic basis. A suitable preprocessing of attenuation data has been performed. The correlation of both the slope and the duration of fade events with the attenuation level have been analyzed, giving useful results for fade-countermeasure applications.

关键词： Attenuation Satellites Information filtering Information filters Data mining Rain fading Real time systems Earth Frequency diversity adaptive coding

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Fairness enhancement of link adaptation techniques in wireless access networks

Fairness enhancement of link adaptation techniques in wirele...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： M.H. Ahmed H. Yanikomeroglu S. Mahmoud Department of Electrical & Computer Engineering Memorial University of Newfoundland Saint John's Canada Broadband Commun. & Wireless Systems (BCWS) Centre Department of Systems & Computer Engineering Carleton University Ottawa Canada

Link adaptation techniques, such as power control and adaptive coding and modulation, aim at maximizing the throughput in wireless networks while maintaining the signal quality in terms of the signal to interference ratio. However, fair resource allocation among different users must be taken into consideration, particularly in fixed broadband wireless access networks. The low/no mobility of users in such networks can lead to location-dependent resource utilization, which causes a significant variation in the performance from a user to another. For instance, adaptive coding and modulation schemes increase the aggregate throughput in the network; however, they also increase the variation of the throughput among users. In this paper, we propose, and analyze the performance of, three fairness enhancement schemes that can be integrated with link adaptation techniques. Results show that the three proposed scheme can enhance the fairness of link adaptation techniques with different degrees without causing (or with minor) degradation to the total network throughput.

关键词： Wireless networks Throughput adaptive coding Modulation coding Resource management Power control Interference Aggregates Performance analysis Degradation

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