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检索条件"主题词=adaptive coding"

共 562 条记录，以下是151-160 订阅

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A Novel Dimensioning Method For High Throughput Satellite Design

A Novel Dimensioning Method For High Throughput Satellite De...

引用

IEEE 1st AESS European Conference on Satellite Telecommunications (ESTEL)

作者： Serrano-Velarde, Dimitri Lance, Emmanuel Fenech, Hector R-Guisantes, Georges Eutelsat SA Paris Ile De France France

ISBN: (纸本)9781467346887;9781467346863

This work describes a novel methodology for the dimensioning of a Ka-Band high throughput satellite (HTS) for broadband communications. The method is based on the optimization of performance for a forward link, as a function of a set of input criteria and a given envelope of available power. This approach is based on a spacecraft architecture using a multi-beam coverage implementing frequency re-use. Among the input criteria, we use the percentage of covered service area with a certain type of earth stations, the service availability and the cost and mass of the system. The proposed methodology is adaptable to any kind of service area. A digital video broadcasting satellite second generation (DVB-S2) air interface with adaptive coding and modulation (ACM) is used as a reference. The method, employing iterative advanced link budget calculations including carrier-to-interference at antenna level, provides the highest capacity given a batch of antenna and pragmatic feed design.

关键词： service areas DIMENSIONING Health Services Accessibility satellite design forward link adaptive coding ANTENNA antennae Throughput

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AN H.264/AVC INVERSE TRANSFORM ADAPTATION METHOD FOR VIDEO STREAMING APPLICATIONS

AN H.264/AVC INVERSE TRANSFORM ADAPTATION METHOD FOR VIDEO S...

引用

20th European Signal Processing Conference (EUSIPCO)

作者： de Oliveira, Rafael Galvao Trocan, Maria Pesquet-Popescu, Beatrice Telecom ParisTech 46 Rue Barrault F-75634 Paris France Inst Super Elect Paris F-75006 Paris France

ISBN: (纸本)9781467310680

Bandwidth sharing in video streaming applications becomes problematic with the explosion of live services. In such applications, compression optimization techniques are seen as an efficient way for enforcing high quality video transmission. In this paper, we propose a low-complexity adaptive encoding framework for H.264/AVC, in which the inverse transformation matrix is optimized for each frame, as function of both content and quantization noise. As the transform optimization is done in one encoding pass, it can be successfully used in live encoding setups. The proposed synthesis filter adaptation method shows promising results compared to H.264/AVC, making it suitable for video streaming applications.

关键词： Inverse transform adaptive coding DCT filter bank H.264/AVC

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FAST LOSSLESS IMAGE COMPRESSION WITH 2D GOLOMB PARAMETER ADAPTATION BASED ON JPEG-LS

FAST LOSSLESS IMAGE COMPRESSION WITH 2D GOLOMB PARAMETER ADA...

引用

20th European Signal Processing Conference (EUSIPCO)

作者： Wang, Z. Klaiber, M. Gera, Y. Simon, S. Richter, Th. Univ Stuttgart Dept Parallel Syst D-70569 Stuttgart Germany Univ Stuttgart RUS Comp Ctr D-70550 Stuttgart Germany

ISBN: (纸本)9781467310680

A Fast and Lossless Image Compression (FLIC) algorithm based on the median edge predictor and Golomb coder of JPEG-LS is presented. FLIC eliminates the gradient-based context model from the JPEG-LS standard, the most expensive parts with respect to computational complexity and memory space requirements. To avoid a large context memory, Golomb parameter is selected based on the coding states and the prediction residuals of up to two immediate neighbors, one in each dimension. The FLIC algorithm has low memory footprint and dissolves the data dependencies in JPEG-LS to facilitate parallelization. Experimental results show that the FLIC algorithm achieves a throughput speedup factor of 3.7 over JPEG-LS with less than 4% compression performance penalty. Lossless compression performance results further show that FLIC outperforms other state-of-the-art standards including JPEG 2000 and JPEG XR.

关键词： Lossless image compression low complexity coding adaptive coding parallelization JPEG-LS

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Fast and Context-free Lossless Image Compression Algorithm based on JPEG-LS

Fast and Context-free Lossless Image Compression Algorithm b...

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Data Compression Conference (DCC)

作者： Gera, Yurij Wang, Zhe Simon, Sven Richter, Thomas Univ Stuttgart Dept Parallel Syst D-70550 Stuttgart Germany Univ Stuttgart RUS Comp Ctr D-70550 Stuttgart Germany

ISBN: (纸本)9780769546568

While the context-based entropy coding and bias cancellation steps in the JPEG-LS standard are key features to its compression performance, these steps also enlarge the memory footprint, create dependencies in the data path of implementations and hence limit parallelism in modern multi-core or GPU architectures, and the throughput in hardware implementations. In the proposed modification of JPEG-LS, such most expensive parts with respect to memory space requirements and computational complexity are omitted.

关键词： adaptive coding context modelling JPEG-LS low complexity

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A feedback-based adaptive broadcast coding scheme for reducing in-order delivery delay

A feedback-based adaptive broadcast coding scheme for reduci...

引用

Workshop on Network coding, Theory and Applications (NetCod)

作者： Jay Kumar Sundararajan Parastoo Sadeghi Muriel Medard Massachusetts Institute of Technology Cambridge MA USA Australian National University Canberra ACT Australia

We propose a new feedback-based adaptive coding scheme for a packet erasure broadcast channel. The main performance metric of interest is the delay. We consider two types of delay - decoding delay and delivery delay. Decoding delay is the time difference between the instant when the packet is decoded at an arbitrary receiver and the instant when it arrived at the sender. Delivery delay also includes the period when a decoded packet waits in a resequencing buffer at the receiver until all previous packets have also been decoded. This notion of delay is motivated by applications that accept packets only in order. Our coding scheme has the innovation guarantee property and is hence throughput optimal. It also allows efficient queue management. It uses the simple strategy of mixing only the oldest undecoded packet of each receiver, and therefore extends to any number of receivers. We conjecture that this scheme achieves the asymptotically optimal delivery (and hence decoding) delay. The asymptotic behavior is studied in the limit as the load factor of the system approaches capacity. This conjecture is verified through simulations.

关键词： Broadcasting Delay Decoding Throughput Broadcast technology Streaming media Feedback Australia adaptive coding Measurement

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adaptive Reed-Solomon coding in Eigen-MIMO with Non-adaptive Modulation

Adaptive Reed-Solomon Coding in Eigen-MIMO with Non-Adaptive...

引用

IEEE 74th Vehicular Technology Conference (VTC)

作者： Banani, S. Alireza Vaughan, Rodney G. Simon Fraser Univ Sch Engn Sci Burnaby BC V5A 1S6 Canada

ISBN: (纸本)9781424483273

An adaptive coding scheme for spectral efficiency improvement in eigen-MIMO is presented. It uses Reed-Solomon (RS) codes with non-adaptive QAM. Non-adaptive modulation is of interest since it reduces the high complexity - in both the electronics and the protocol - required for deploying the more commonly treated adaptive modulation. RS codes have practical advantages in terms of their algorithmic simplicity, memory requirements and decoder complexity. Unlike many codes, an analytical solution for the error probability is available for RS coding. This facilitates finding the jointly optimal code rate(s) and power allocation on the eigenchannels, with the criterion of maximum instantaneous practicable capacity (data throughput). The adaptation is applied to two different architectures of the encoders/decoders (CODECs) for eigen-MIMO, and their performances are compared with the uncoded case. The outer coding architecture refers to a single CODEC working on the overall serial data, and inner coding refers to separate CODECs for different eigenchannels. The adaptive RS system with optimum power allocation reveals new capacity behavior which is different to that of water-filling. For the moderate values of SNR (6-20 dB) typical of wireless systems, the improvement in the capacity over the no-coding case is greater for the inner coding architecture.

关键词： adaptive coding MIMO water filling eigenchannel ergodic capacity practicable capacity Reed-Solomon coding

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adaptive coding and modulation in MIMO OFDMA systems

Adaptive coding and modulation in MIMO OFDMA systems

引用

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

作者： Stephan Stiglmayr Johannes Klotz Martin Bossert Institute of Telecommunications and Applied Information Theory DIm University Ulm Germany

adaptive coding and modulation are well known techniques for enhancing the performance of systems transmitting over quasi-static fading channels. Especially their application in OFDM based systems promises gains in spectral efficiency. In former work we presented an efficient method for the joint optimization of code rate and modulation formats if rate-compatible punctured codewords are mapped onto sub-symbols with heterogeneous channel quality and modulation formats. In this paper, we demonstrate the application of our scheme to MIMO techniques. More specifically, we investigate non-orthogonal spatial multiplexing schemes in bit-interleaved coded OFDM systems. The techniques are evaluated within the context of the OFDMA/TDMA system designed within the EU FP6 Integrated Project WINNER.

关键词： adaptive coding Modulation coding MIMO Forward error correction Fading OFDM modulation Bit error rate Parity check codes Signal to noise ratio Proposals

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FAST LOSSLESS IMAGE COMPRESSION WITH 2D GOLOMB PARAMETER ADAPTATION BASED ON JPEG-LS

FAST LOSSLESS IMAGE COMPRESSION WITH 2D GOLOMB PARAMETER ADA...

引用

European Signal Processing Conference

作者： Z. Wang M. Klaiber Y. Gera S. Simon Th. Richter Dept. of Parallel Systems Univ. of Stuttgart RUS Computing Center Univ. of Stuttgart

ISBN: (纸本)9781467310680

关键词： Lossless image compression Low complexity coding adaptive coding Parallelization JPEG-LS data dependency JPEG Image compression lossless compression Context modeling memory space lossless image compression speedup factor complexity classes

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Modem Link-Property Advertisements

Modem Link-Property Advertisements

引用

IEEE Aerospace Conference

作者： William D. Ivancic Lloyd Wood Dan Shell Daniel Floreani Rajiv Asati NASA Glenn Research Center Cleveland OH 44135 United States University of Surrey alumni University of Akron Akron OH 44325 United States Cisco Systems Adelaide South Australia 5000 Australia Cisco Systems Research Triangle Park NC 27709 United States

ISBN: (纸本)9781457705564

Devices and associated applications are increasingly connected to a variety of smart modems that have dynamically varying link characteristics. For example, incoming and outgoing link rates can be varied over time with adaptive coding and modulation to suit the channel characteristics. In addition, those links may go up and down due to a variety of factors. The link rate and conditions offered by the modem to connected devices and associated applications therefore vary. In order to autonomously condition traffic and allow the network to get the most out of the modem's link capacity, the upstream devices and applications need to be informed of the modem's link conditions. This becomes a form of cognitive networking. This paper will discuss the problem and present a simple protocol that can be used to provide upstream devices and applications with downstream link conditions. While the protocol in this document is described in the context of modem radio-frequency link properties, it can also be broadly applied to other scenarios such as cryptographic devices.

关键词： Modems adaptive coding Advertisements cryptoequipment protocols Coupling Devices

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Partitioned cyclic code shift keying for JTIDS

Partitioned cyclic code shift keying for JTIDS

引用

MILCOM, Military Communications Conference

作者： Hong-Jun Noh Jae-Sung Lim Graduate School of Information Technology Ajou University Suwon South Korea

In this paper, we propose partitioned cyclic code shift keying (PCCSK) for the Joint Tactical Information Distribution System (JTIDS) by combining a Hadamard matrix and a modified maximal length sequence (MMLS). The proposed approach adaptively increases the transmission data rate within a limited transmission range in the battlefield. By exploiting a new code set as a spreading code and by adopting code selection, the system is easily able to achieve higher spectral efficiency. For additional performance enhancement, we apply adaptive channel coding with PCCSK, and we derive the appropriate code pairs. Monte Carlo simulations are conducted to show the transmission ranges of the proposed scheme, and the results show that PCCSK with adaptive coding can support a higher data rate with a reasonable transmission range.

关键词： adaptive coding Throughput Fading Degradation Channel coding Error correction codes Modulation

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