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检索条件"主题词=adaptive coding"

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Capacity of advanced TDMA systems for fixed radio access

Capacity of advanced TDMA systems for fixed radio access

引用

IEE Colloquium on Local Loop Fixed Radio Access

作者： A.G. Burr S.J. Baines T.C. Tozer Department of Electronics University of York York UK Dept. of Electron. York Univ. UK

We review the potential of advanced TDMA systems for fixed radio access. We highlight the differences between the fixed radio access (FRA) environment and the cellular mobile environment, and show that there are significant advantages in a system designed specifically for FRA over mobile and personal systems adapted for this purpose. The features of an advanced TDMA system for FRA are discussed, including the use of directional antennas, and adaptive rate coding and modulation. In particular we consider the capacity improvement possible by the use of directional antennas. Even if 99.9% availability is required, a system spectral efficiency of 0.7 bits/s/Hz/cell is possible, a factor of two improvement on a system with isotropic antennas. The advantages of adaptivity are shown by considering a simple adaptive protocol which is able to improve on this figure by a factor of four.

关键词： Subscriber loops Land mobile radio cellular systems Information rates Time division multiaccess Personal communication networks adaptive coding Modulation Directive antennas

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An overview of the ETSI-BRAN HIPERACCESS physical layer air interface specification

An overview of the ETSI-BRAN HIPERACCESS physical layer air ...

引用

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

作者： K. Fazel C. Decanis J. Klein G. Licitra L. Lindh Y.Y. Lebret Marconi Communications Backnang Germany Ericsson Laboratory Italy Milan Italy Ensemble Communications Inc. San Diego CA USA Siemens ICN S.p.A. Milan Italy Nokia Helsinki Finland Alcatel Nanterre France

The ETSI-BRAN-HIPERACCESS standard is confined to specify the radio subsystem above 11 GHz of a point-to-multi-point (PMP) interoperable system consisting of the physical (PHY) layer and the data link control (DLC)/convergence layer (CL) - which are both core network independent. The paper gives a description of the physical layer, which specifies the transmission scheme in order to allow interoperability between equipment developed by different manufacturers. This is achieved by standardizing all baseband signal processing structures in the transmitter side by using the most technology advanced architecture and components. The system, by employing adaptive coding and modulation (i.e. individual link adaptation) and cell sectorization techniques, offers a high spectral efficiency and a great flexibility for the deployment. Furthermore, the specification includes basic RF aspects and those other parameters necessary for radio regulatory purposes.

关键词： Physical layer Portable media players Radio control Control systems Convergence Pulp manufacturing Baseband adaptive signal processing Radio transmitters adaptive coding

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Surf-Deformer: Mitigating Dynamic Defects on Surface Code via adaptive Deformation

Surf-Deformer: Mitigating Dynamic Defects on Surface Code vi...

引用

IEEE/ACM International Symposium on Microarchitecture (MICRO)

作者： Keyi Yin Xiang Fang Travis S. Humble Ang Li Yunong Shi Yufei Ding University of California San Diego La Jolla CA USA Oak Ridge National Laboratory Oak Ridge TN USA Pacific Northwest National Laboratory Richland WA USA AWS Quantum Technologies New York NY USA

ISBN: (数字)9798350350579

ISBN: (纸本)9798350350586

In this paper, we introduce Surf-Deformer, a code deformation framework that seamlessly integrates adaptive defect mitigation functionality into the current surface code workflow. It crafts several basic deformation instructions based on fundamental gauge transformations, which can be combined to explore a larger design space than previous methods. This enables more optimized deformation processes tailored to specific defect situations, restoring the QEC capability of deformed codes more efficiently with minimal qubit resources. Additionally, we design an adaptive code layout that accommodates our defect mitigation strategy while ensuring efficient execution of logical operations. Our evaluation shows that Surf-Deformer outperforms previous methods by significantly reducing the end-to-end failure rate of various quantum programs by 35× to 70×, while requiring only about 50% of the qubit resources compared to the previous method to achieve the same level of failure rate. Ablation studies show that Surf-Deformer surpasses previous defect removal methods in preserving QEC capability and facilitates surface code communication by achieving nearly optimal throughnut.

关键词： Codes Microarchitecture Deformation Error analysis Prevention and mitigation Instruction sets Qubit Layout Surface treatment adaptive coding

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Speech-quality optimization of 16 kb/s adaptive predictive coders

Speech-quality optimization of 16 kb/s adaptive predictive c...

引用

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

作者： R. Viswanathan W. Russell A. Higgins M. Berouti J. Makhoul Bolt Beranek and Newman Inc. Cambridge Mass. Bolt Beranek and Newman 슠Inc. Cambridge MA USA

This paper considers the optimization of speech quality of adaptive predictive coding (APC) systems for transmission over a synchronous 16 kb/s channel. Among the important issues included in this on-going optimization study are: comparative evaluation of several methods for adaptive coding of the APC residual; comparative testing of several methods for adaptive shaping of the spectrum of the quantization noise; and optimization of various parameter values and their bit allocation. In addition to reporting the results from this study, we report on the occurrence of "limit cycles" or regions of excessive quantization noise build-up, offer an explanation for their cause in terms of the feedback gain (or "loop gain") of the APC transmitter, and present experimental results obtained using several remedial means for this problem. Also, we report on the relative properties of different APC coder configurations. Based on the results of our optimization study to date, we present several optimized APC systems.

关键词： Optimization methods Quantization Noise shaping Speech coding Predictive coding adaptive coding Testing Bit rate Limit-cycles Feedback loop

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Diversity investigation of satellite backbone network for BFWA systems

Diversity investigation of satellite backbone network for BF...

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International Workshop on Satellite and Space Communications (IWSSC)

作者： Peter Kantor Gabor Toth Arpad Drozdy Janos Bito Department of Broadband Infocommunications and Electromagnetic Theory Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

The Broadband Fixed Wireless Access (BFWA) networks are terrestrial systems operating at high carrier frequencies (above 20 GHz), therefore one of the most harmful circumstantial factors in these systems is the attenuation caused by precipitation, especially by rain. Employing site diversity is a well-known method to improve the signal to interference plus noise ratio conditions within the BFWA network. The backbone of a BFWA can be wired or wireless terrestrial, however the connection between base stations and the operator's core network can be also established by high frequency satellite links. Applying a satellite backbone system and route diversity between the Earth-space links can compensate precipitation attenuation. In this paper the efficiency of the diversity scheme in a satellite backbone network for BFWA system will be presented.

关键词： Spine Diversity methods Rain Base stations Satellite broadcasting Signal to noise ratio Frequency adaptive coding Satellite ground stations Portable media players

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adaptive RED for Cross-layer DVB-S2 systems

Adaptive RED for Cross-layer DVB-S2 systems

引用

International Symposium on Wireless Communication Systems (ISWCS)

作者： F. Vieira M.A. Vazquez Castro G. Seco Granados Escola Tecnica Superior d'Enginyeria Universitat Authnòma de Barcelona Barcelona Spain Escola Tecnica Superior d'Enginyeria Universitat Authnòma de Barcelona Spain

Systems with an adaptive physical layer make use of the channel conditions information in order to adapt their transmission to the channel with adaptive coding and modulation (ACM) techniques. These systems present a challenge in providing quality-of-service since the capacity is not constant. Previous work has covered capacity allocation solutions that provide service guarantees and fairness in terms of bandwidth allocation. In this paper, we present active queue management techniques that provide delay guarantees. We analyse the adaptive RED algorithm and present the required changes for implementing RED over an adaptive physical layer system. We show through simulations that there is an optimal operating point in the trade-off between packet marking and maximum queuing delay.

关键词： Digital video broadcasting Delay Physical layer adaptive systems adaptive coding Modulation coding Channel allocation Algorithm design and analysis Bandwidth Quality of service

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Cross-Layer and Path Priority Scheduling Based Real-Time Video Communications over Wireless Sensor Networks

Cross-Layer and Path Priority Scheduling Based Real-Time Vid...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Min Chen Victor C. M. Leung Shiwen Mao Ming Li Department ECE University of British Columbia Canada Department ECE Aubum University Auburn AL USA Department CS California State University Fresno CA USA

This paper addresses the problem of real-time video streaming over a bandwidth and energy constrained wireless sensor network (WSN). Considering the compressed video bit stream is extremely sensitive to transmission errors, and the constraints in bandwidth and energy in WSNs and delay in video delivery, we exploit the construction of an application-specific number of multiple disjoint paths to enlarge the aggregate bandwidth and facilitate load balancing and fast packet delivery. For efficient multi-path routing of real-time video frames, we propose a path priority scheduling algorithm to satisfy the delay constraint of video frames while balancing energy and bandwidth usage among all the available paths. In the case that the aggregate bandwidth is still not enough to satisfy the required coding rate, we further exploit a cross-layer technique for adaptive coding according to path status. The effectiveness of the proposed scheme is evaluated and demonstrated by simulations.

关键词： Wireless sensor networks Bandwidth Video compression Streaming media Delay Aggregates Load management Routing Scheduling algorithm adaptive coding

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The Worst-case Performance Of adaptive Huffman Codes

The Worst-case Performance Of Adaptive Huffman Codes

引用

IEEE International Symposium on Information Theory

作者： J.A. Storer Computer Science Department Brandeis University Waltham MA USA

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SAT03-2: Framing Efficiency Optimization for DVB-S2 Systems

SAT03-2: Framing Efficiency Optimization for DVB-S2 Systems

引用

IEEE Globecom 2006

作者： Ronald Toegl Cristina Parraga Niebla Ulla Birnbacher German Aerospace Center (DLR) Institute of Communications and Navigation Germany German Aerospace Center (DLR) Institute of Communications and Navigation Wessling Germany Graz University of Technology Institute of Communication Networks and Satellite Communications Austria

This paper deals with the design, evaluation and performance comparison of smart framing strategies that complement the packet scheduler in DVB-S2 systems with adaptive coding and modulation. Provided that user data packets are transmitted grouped in frames, each of them using a modulation and coding setting (ModCod), the inherent spectral efficiency of the selected ModCod can be cancelled by a poor framing efficiency, i.e. transmitting frames with large padding component. For this reason, smart framing strategies are proposed in this paper, which optimize the framing efficiency.

关键词： Digital video broadcasting Modulation coding adaptive coding Streaming media Encapsulation Scheduling algorithm Robustness Satellites Throughput Protocols

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adaptive code modulation for 2D optical memories

Adaptive code modulation for 2D optical memories

引用

International Symposium on Optical Memory and Optical Data Storage

作者： L. Selavo D.M. Chiarulli S.P. Levitan Department of Computer Science University of Pittsburgh Pittsburgh PA USA

Volumetric and page oriented optical storage systems have a great potential for high data density and high speed through page oriented data access (Haichuan Zhang et al, Proc. 18th IEEE Symp. Mass Storage Sys., 2001). However, in order to be practical, they have to maintain data integrity using error correction and modulation codes. The coding comes at a cost of spatial overhead of codeword size over the source data size, and processing time overhead for encoding and decoding. Our proposed adaptive modulation scheme strives to minimize both overheads. It achieves utilization of 74% with constant time complexity, which is competitive with other recently proposed schemes for page-oriented memories.

关键词： Optical modulation adaptive coding Modulation coding adaptive optics Encoding Optical arrays High speed optical techniques Decoding Costs Detectors

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