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检索条件"主题词=adaptive coding"

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Generation of self-optimizing wireless network applications

Generation of self-optimizing wireless network applications

引用

International Conference on Autonomic Computing (ICAC)

作者： S.M. Sadjadi P.K. McKinley R.E.K. Stirewalt B.H.C. Cheng Software Engineering and Network Systems Laboratory Department of Computer Science and Engineering Michigan State University East Lansing MI USA

Adaptable applications are difficult to develop and maintain especially if adaptive code, which implements the adaptive behavior, is tangled into functional code, which implements the imperative behavior. Our work investigates how to wrap existing applications transparently to generate such management components. Developing manageable components requires some mechanism to support adaptation in behavior. The predominant mechanism for implementing adaptation in object-oriented software is behavioral reflection, which can be used to modify how an object responds to a message. This work describes the application of TRAP/J to a multicast audio application. The audio-streaming application (ASA) is designed to deliver interactive audio from a microphone at one network node to multiple receiving nodes.

关键词： Wireless networks Reflection Application software Quality of service adaptive coding Wireless LAN Software engineering Laboratories Computer science Environmental management

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A generalized adaptive code acquisition scheme using backpropagation network in DS/SS systems

A generalized adaptive code acquisition scheme using backpro...

引用

International Conference on Communication Systems

作者： Takki Yu Sangchul Han Daesik Hong Changeon Kang Information and Telecommunication Laboratory Department of Electrical and Electronic Engin. Yonsei University Seoul South Korea

ISBN: (纸本)0780375106

A generalized adaptive code acquisition scheme is proposed by using a multi-layer structure. The backpropagation network (BPN) is used in modeling the multilayer system. The timing offset of the received code can be detected by combining the hidden layer weights after an adaptation period. The characteristics of mean squared error (MSE) and weight distribution for the generalized system are analyzed, and the effects of input and hidden nodes are investigated. The generalized system provides a high detection probability and flexibility in acquisition system design.

关键词： adaptive coding Backpropagation Intelligent networks Delay estimation adaptive systems adaptive filters Finite impulse response filter Timing Spread spectrum communication Time measurement

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A novel adaptive code acquisition using antenna array for DS/CDMA systems

A novel adaptive code acquisition using antenna array for DS...

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International Workshop on Antenna Technology: Small Antennas and Novel Metamaterials, iWAT

作者： Hua-Lung Yang Wen-Rong Wu Department of Communication Engineering National Chiao Tung University Hsinchu Taiwan

ISBN: (纸本)0780388429

The paper proposes a novel code acquisition scheme employing an adaptive beamformer and an adaptive temporal filter. Conventional code acquisition with beamforming requires a code-phase testing procedure which can be time-consuming. The proposed scheme simultaneously performs beamforming and code acquisition and the acquisition time can be much shorter than conventional approaches. Using the least mean square (LMS) adaptive algorithm, we are able to obtain a simple yet robust acquisition scheme. We also perform a theoretical analysis which includes derivations of the minimum mean-squared error (MSE), the excess MSE, and the beamformer output signal-to-interference-plus-noise ratio (SINR). Simulation results verify that the proposed scheme has satisfactory performance and the derived theoretical results are accurate.

关键词： adaptive arrays adaptive coding Antenna arrays Multiaccess communication Array signal processing adaptive filters Testing Least squares approximation adaptive algorithm Robustness

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Spectral efficiency under Transmit Antenna and LDC selection with throughput maximization using WiMAX

Spectral efficiency under Transmit Antenna and LDC selection...

引用

International Conference on Telecommunications (ICT)

作者： I. Gutierrez F. Bader A. Mourad Advanced Technology Standards and Regulation (ATSR) Samsung Electronics Research Institute London UK Centre Tecnològic de Telecomunicacions de Catalunya Barcelona Spain

In this paper the spectral efficiency using combinations of Transmit Antenna Selection with Linear Dispersion Code Selection (TACS) is studied. The selection criterion is defined in order to maximize the spectral efficiency while bounding the maximum error rate (Rate Adaptation). The performance of the proposed spatial link adaptation scheme is evaluated under low mobility environments concluding that in case of linear receivers (e.g. MMSE) the TACS scheme with adaptive coding and modulation achieves a noticeable SNR gain (up to 3dB) in a wide SNR range (from 6 to 18dB), and could be considered as a powerful technique to achieve a smooth transition between diversity and multiplexing in order to maximize the overall system throughput.

关键词： Transmitting antennas Throughput WiMAX Transmitters MIMO Channel capacity adaptive coding Modulation coding Bit error rate Telecommunication standards

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Bit energy distribution effects in progressively encoded video frame transmissions

Bit energy distribution effects in progressively encoded vid...

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： M. Sehlstedt J.P. LeBlanc Division of Signal Processing Luleå University of Technology Lulea Sweden

We investigate physical layer opportunities resulting from multimedia streams which use progressive coding. With such progressively encoded video frames the location of the first bit error is more important than the overall bit error probability. This makes the expected error free length a reasonable metric for performance optimization. One physical layer opportunity is the adjustment of bit energy within data frames. For wireless links nonuniform bit-energy distributions result in a flexible solution that may be used in conjunction with channel coding. We identify system gains to be achieved with nonuniform bit energy distribution optimizations and also show that a simplified frame truncation technique may be used without significant loss of quality.

关键词： Streaming media Physical layer Strips Delay Channel coding Degradation adaptive coding Feedback Decoding Image coding

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Noncoherent adaptive code synchronization for DS/CDMA systems

Noncoherent adaptive code synchronization for DS/CDMA system...

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GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270)

作者： Takki Yu Jonghyung Kwun Hyounggoo Jeon Daesik Hong Changeon Kang Dept. of Electronics Yonsei Univ. Seodaemungu Seoul Korea Dept. of Information and Communications Engineering Dongeui Univ. Pusan Korea

In this paper, a noncoherent adaptive code acquisition scheme is proposed by combining an adaptive filter with a differential detector. The carrier phase offset in the PN signal component of the filter input is removed by a differential detector. The probabilities for detection and false alarm are derived, and the mean acquisition time is evaluated under AWGN channel. The performance of the proposed system is compared with the conventional system using a matched filter. Simulation results show that the proposed system has a good performance under overall channel conditions, especially at low SNR. And the proposed system outperforms the matched filter by 4-6 dB under AWGN channel for 16 taps, as measured by the mean acquisition time.

关键词： adaptive coding Multiaccess communication Detectors adaptive filters Delay effects AWGN channels Matched filters Time measurement Additive white noise Gaussian noise

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Combined power/code rate adaptation in Reed-Solomon coded frequency-hopped spread-spectrum multiple access communications

Combined power/code rate adaptation in Reed-Solomon coded fr...

引用

IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： Jik Dong Kim Sang Wu Kim Department of Electrical Engineering Korea Advanced Institute of Science and Technology Daejeon South Korea

We consider a combined power/code rate adaptation in Reed-Solomon (RS) coded frequency-hopped spread-spectrum multiple access (FH/SSMA) communications, where the transmission power and code rate are adapted simultaneously relative to the channel traffic and channel fading. We investigate the optimal transmission strategy that minimizes the required signal-to-noise ratio for a given error performance, and the performance improvement provided by the optimal strategy over adaptive code rate control and adaptive power control. We show that the combined power/rate control provides an asymptotic power gain of 5.67 dB over adaptive code rate control.

关键词： Reed-Solomon codes adaptive coding Frequency Spread spectrum communication Communication system traffic control Fading Signal to noise ratio Error correction codes Optimal control Communication system control

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Lossless bit-plane compression of images with context tree modeling

Lossless bit-plane compression of images with context tree m...

引用

International Conference on Green Circuits and Systems (ICGCS)

作者： Minjie Chen Pasi Fränti Mantao Xu School of Computing University of Eastern Finland Joensuu Finland School of Electrical Engineering Shanghai Dianji University Shanghai China

Bit-plane coding has been widely used in lossless compression of gray-scale images or color palette images. In the context-based encoding procedure, the values of previous significant planes are also considered, which is simplified as surrounding pixel's expectation values. In this paper, we further improved the encoding scheme by context-tree modeling, in which both the order and depth of the context template is optimized. In probability estimation scheme, a forgetting factor and context weighting are utilized. According to our experiments, the proposed method compete with the existing algorithms in lossless compression of gray-scale images, and outperforms all competitive methods in compression or color palette images.

关键词： Image coding Context modeling Bit rate Surveillance Video compression Automatic voltage control adaptive coding Video coding Encoding Cameras

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The TCP "adaptive-Selection" Concept

The TCP "Adaptive-Selection" Concept

引用

IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference

作者： Carlo Caini Rosario Firrincieli Daniele Lacamera DEIS/ARCES University of Bologna Bologna Italy

The rapidly increasing importance of wireless communications (including satellite) together with the rapid growth of high speed networks pose new challenges to TCP. To overcome them, a wide variety of TCP enhancements has been presented in literature. However, because most proposals aim to address different impairments, the choice of "the best" TCP enhancement becomes arduous, given the increasing level of heterogeneity of present and future networks. The TCP adaptive- selection concept, introduced by the authors in this paper, aims at providing an alternative approach, by challenging the idea that only one TCP enhancement must be adopted. In fact, by extending the concept that underlies ACM (adaptive coding and Modulation) to Transport layer, it envisages concurrent adoption of different TCP versions on the same server, the better to match the different impairments present on different connections. Preliminary results obtained by considering a simple application example are encouraging, and justify the following remarks on feasibility and the discussion of some implementation proposals.

关键词： Proposals Satellites Physical layer Linux Bandwidth Internet adaptive coding Modulation coding Wireless communication Transport protocols

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Capacity of Wireless Multi-hop Networks Using Physical Carrier Sense and Transmit Power Control

Capacity of Wireless Multi-hop Networks Using Physical Carri...

引用

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

作者： Eren Gurses Raouf Boutaba School of Computer Science University of Waterloo Waterloo ONT Canada

In this paper, we investigate the capacity of CSMA (carrier sense multiple access) based wireless multi-hop networks with random topologies described by the hop length distribution. First we develop an analytical model for the effective link capacity as a function of transmit power adaptation policy, physical carrier sense threshold, hop length distribution and medium access probability of p-persistent CSMA. Secondly, we devise an optimal transmit power control scheme that maximizes the network capacity by adjusting the transmit power and the corresponding physical carrier sense threshold. Thereafter, it is extended for the joint optimization of these parameters with the medium access probability of CSMA. Finally we compare the optimal power control scheme with the minimum transmit power policy in. Results show that the proposed power control scheme optimally trades off the spatial reuse (number of interfering links) to the link SIR (signal-to-interference ratio) and achieves an amount of ~%15 increase in network capacity when both schemes employ joint optimization.

关键词： Wireless sensor networks Spread spectrum communication Power control Multiaccess communication Signal to noise ratio Analytical models Capacity planning Computer science adaptive coding Modulation coding

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