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检索条件"主题词=adaptive coding"

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On the design of coded MIMO systems

On the design of coded MIMO systems

引用

International Conference on Communications and Information Technology

作者： Mohamad Sayed Hassan Ammar El Falou Charlotte Langlais Alten Sir Universite de Rennes 1 Institut Mines-Telecom

ISBN: (纸本)9781467353069

In this paper, we investigate two approaches which deal with the construction of space-time block (STB) codes for a system possessing a forward error correcting (FEC) code at the transmitter side. The first approach designs the STB codes to be optimal for a system equipped by a turbo MMSE equalizer at the receiver side, with a minimum peak to average power ratio (PAPR) constraint. The second one proposes to design the STB codes according to a non-asymptotic design criterion based on the bitwise mutual information (BMT) maximization at a specific target SNR. Performance assessments of designed codes are validated by Monte Carlo simulations.

关键词： MIMO Receivers Peak to average power ratio Signal to noise ratio Detectors Complexity theory adaptive coding

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ACT: an adaptive CORBA template to support unanticipated adaptation

ACT: an adaptive CORBA template to support unanticipated ada...

引用

International Conference on Distributed Computing Systems

作者： S.M. Sadjadi P.K. McKinley Software Engineering and Network Systems Laboratory Michigan State University East Lansing MI USA

We propose an adaptive CORBA Template (ACT), which enables run-time improvements to CORBA applications in response to unanticipated changes in either their functional requirements or their execution environments. ACT enhances CORBA applications by transparently weaving adaptive code into their object request brokers (ORBs) at run time. The woven code intercepts and adapts the requests, replies, and exceptions that pass through the ORBs. Specifically, ACT can be used to develop an object-oriented framework in any language that supports dynamic loading of code and can be applied to any CORBA ORB that supports portable interceptors. Moreover, ACT can be used to support interoperation among otherwise incompatible adaptive CORBA frameworks. To evaluate the performance and functionality of ACT, we implemented a prototype in Java. Our experimental results show that the overhead introduced by the ACT infrastructure is negligible, while the adaptations offered are highly flexible.

关键词： adaptive coding Java Quality of service Fault tolerance Application software Middleware Distributed computing Software engineering Computer science Runtime

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GBS over WGS Using DVB-S and DVB-S2 (#1546)

GBS over WGS Using DVB-S and DVB-S2 (#1546)

引用

MILCOM, Military Communications Conference

作者： Bruce Bennett Daniel Hannan James Marshall Richard Gibbons DISA SMDC/ARSTRAT USA MITRE Corporation USA

This paper determines the link performance of Global Broadcast Service (GBS) when it is transitioned to Wideband Global SATCOM (WGS) satellites. Current and future (smaller) GBS terminals as well as current Digital Video Broadcast-Satellite (DVB-S) and future (DVB-S2) Modems are considered. DVB-S2 provides a large increase in capability in terms of modulations and forward error correcting coding rates. In addition, DVB-S2 allows for different modulations and coding to different terminals using variable coding and modulation (different streams are coded with different, fixed parameters within the DVB-S2 physical layer frame). Further DVB-S2 allows adaptive coding and modulation whereby each frame is coded with its own set of parameters (which are dynamically modified according to reception conditions). The WGS performance will be based on a System Utilization Plan (SUP) including a frequency plan and beam configuration applied to the first WGS satellite placed in orbit at 175E. The WGS SUP includes a case where two uplink carriers in a single WGS 125 MHz channel are fanned-out to two Ka-band downlink beams where the downlink carriers share the same channel. Cases where the single GBS downlink carrier shares the 125 MHz channel with non-GBS traffic are also considered. A Theater Injection Point (TIP) uplink into a narrow beam with the downlink in a wide bean is also defined. Several propagation margins are considered to allow results to be applied to different receive terminal locations.

关键词： Digital video broadcasting Satellite broadcasting Modulation coding Downlink Wideband Modems Error correction Streaming media Physical layer adaptive coding

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Fast codes for large alphabet sources and its application to block encoding

Fast codes for large alphabet sources and its application to...

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Data Compression Conference (DCC)

作者： B. Ryabkot J. Astola Siberian State Univ. of Telecommun. & Comput. Sci. Tomsk Russia Technical University of Tampere Finland

For many adaptive codes the speed of coding depends substantially on the alphabet size. In this paper we suggest a method for speeding up codes based on the following main idea. Letters of the alphabet are put in order according to their probabilities (or frequencies of occurrence), and the letters with probabilities close to each others are grouped in subsets (as new super letters), which contain letters with small probabilities. Such a grouping can increase the redundancy of the code. The suggested algorithm is applied to block coding. In order to surmount the block coding problem we suggest applying the described method of grouping to the set of all possible blocks in such a way that the redundancy caused by grouping is relatively small whereas the size of new alphabet is much less than the number of the possible blocks.

关键词： Encoding Application software Computer science adaptive coding Frequency Decoding Block codes Information theory Data compression

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On the Optimization of DVB-S2 Links in EHF Bands

On the Optimization of DVB-S2 Links in EHF Bands

引用

IEEE Aerospace Conference

作者： Sandeep Mukherjee Mauro De Sanctis Tommaso Rossi Ernestina Cianca Marina Ruggieri Ramjee Prasad University of Roma "Tor Vergata" Via del Politecnico Aalborg University Center for TelelnFrastruktur (CTIF)

ISBN: (纸本)9781424438877

In this paper an analysis on the use of adaptive coding and Modulation (ACM) techniques for EHF satellite communications is presented with reference to the DVB-S2 standard. The analysis is focused on W-band communication links and includes an optimization of DVB-S2 ACM thresholds of the received Signal to Noise Ratio (SNR) for Extremely High Frequency (EHF) links. The simulation model includes rain fading and amplifier nonlinearities which can not be neglected for the performance analysis and optimization of real systems in W-band.

关键词： DVB-S2 EHF Gene EHF adaptive coding Rain fading Simulation models signal to noise ratios

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Efficient adaptive cooling rate hybrid ARQ protocols

Efficient adaptive cooling rate hybrid ARQ protocols

引用

IEEE International Conference on Communications (ICC)

作者： S. Kallel Department of Electrical Engineering University of British Columbia Vancouver BC Canada

Efficient stop-and-wait, go-back-N and selective-repeat hybrid automatic-repeat-request (ARQ) protocols with adaptive forward error correction using punctured and repetition convolutional coding are proposed and analyzed. The basic idea is to vary the coding rate for error correction according to system parameters, such as the signal-to-noise ratio, the round trip delay and the buffer size at the receiver, so as to maximize the throughput efficiency. The authors refer to these schemes as adaptive coding rate (ACR) ARQ protocols. The performance of the proposed ACR ARQ protocols is evaluated for an additive white Gaussian noise channel.< >

关键词： adaptive coding Automatic repeat request Protocols Forward error correction Convolutional codes Convolution Error correction codes Signal to noise ratio Delay 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

European Signal Processing Conference

作者： Rafael Galvao de Oliveira Maria Trocan Beatrice Pesquet-Popescu Telecom ParisTech Institut Superieur d'Electronique de Paris

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 quantization noise transformation matrix Videotapes Video streaming Explosions problematic adaptive coding synthesis filter

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A Type I hybrid ARQ system with adaptive code rates

A Type I hybrid ARQ system with adaptive code rates

引用

IEEE Singapore International Conference on Networks

作者： M.L. Lin R.H. Deng Department of Electrical Engineering National University of Singapore Singapore

Type I hybrid ARQ systems use an error-control code of fixed rate for error-correction in each transmitted packet. In such systems, the code rate must be carefully chosen to match the channel bit error rate (BER) in order to maximize system throughput. Whenever there is a mismatch between code rate and channel BER, the throughput suffers. This paper proposes a type I hybrid ARQ system which automatically adjusts its code rates to match channel BERs. The proposed system is very simple to implement and yet performs significantly better than type I hybrid ARQ systems of fixed code rate.

关键词： adaptive coding Bit error rate Decoding Throughput Viterbi algorithm Automatic repeat request Convolutional codes Hamming distance Hybrid integrated circuits Protocols

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Synchronization and state estimation of nonlinear physical systems under communication constraints

Synchronization and state estimation of nonlinear physical s...

引用

IEEE Conference on Norbert Wiener in the 21st Century (21CW)

作者： Boris Andrievsky ITMO University Institute for Problems in Mechanical Engineering of RAS Saint Petersburg Russia

ISBN: (纸本)9781467383813

An exposition of the results on synchronization and state estimation of nonlinear systems over the limitedband communication channel is given. Relevance of passifiability condition for controlled synchronization of master-slave nonlinear systems for first order and full-order coder/decoder pairs is demonstrated. The algorithm for state estimation of spatially distributed systems based on the local measurements and quantization of the transmitted data is developed, and its limit opportunities are studied. The numerical and experimental results for various physical systems are described, demonstrating practical applicability of the theoretical statements and high efficiency of the proposed estimation and synchronization schemes.

关键词： Synchronization Observers Nonlinear systems Communication channels Decoding adaptive coding

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Throughput enhancement of joint AMC and power control with diversity combining for next generation mobile satellite systems

Throughput enhancement of joint AMC and power control with d...

引用

IEEE Princeton Section Sarnoff Symposium

作者： Adeyemi A. Ajibesin H. Anthony Chan Muhammadou Kah Department of Electrical Engineering University of Cape Town South Africa School of Information Technology and Communications American University of Nigeria Nigeria Huawei Technologies Company Limited Plano TX USA

An enhanced adaptive scheme based on threshold method with a reduced complexity that combine adaptive modulation and coding with diversity combining is presented for throughput maximization in broadband code division multiple access (CDMA) satellite networks. The proposed algorithm is a modify, enhanced, and more robust version of the existing algorithms for adaptive transmission rate and modulation in CDMA networks. The rate compatible punctured turbo-coded (RCPT), which has been found to give improved throughput performance in a direct sequence (DS) CDMA is exploited. A semi-analytical process and simulations were carried out. It is found that there are significant improvement in the average throughput and the bit-error performance. The proposed algorithm using adaptive coding and modulation (instead of variable spreading gain) outperforms other systems such as Selective Power Control with Active Link Protection (SPC-ALP) algorithm proposed for adaptive transmission rate and power control in CDMA networks.

关键词： Diversity reception Throughput Power control Satellites Multiaccess communication Modulation coding adaptive systems Robustness Turbo codes adaptive coding

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