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检索条件"主题词=adaptive coding"

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Cross-layer optimization of adaptive multi-rate wireless networks using truncated Chase combining HARQ

Cross-layer optimization of adaptive multi-rate wireless net...

引用

IEEE Global Telecommunications Conference (GLOBECOM 2010)

作者： Ramis, Jaume Femenias, Guillem Riera-Palou, Felip Carrasco, Loren Univ Balearic Isl Mobile Commun Grp Palma De Mallorca Spain

ISBN: (纸本)9781424456383

A cross-layer performance analysis of a wireless network using adaptive modulation and coding at the physical layer and a truncated Chase combining hybrid automatic repeat request (HARQ-CC) scheme for error control at the data link layer is developed. Based on a Markov chain queueing model, analytical expressions for performance metrics such as throughput, average packet delay and packet loss rate are derived and then used to formulate a constrained optimization problem to maximize the system throughput under the prescribed Quality-of-Service constraints. Numerical results reveal that HARQ-CC consistently outperforms the classical Type-I Hybrid forward error correction/automatic repeat request schemes.

关键词： HARQ-CC Markov chain queueing model Markov processes adaptive codes adaptive coding adaptive modulation adaptive modulation adaptive multirate wireless networks automatic repeat request cross-layer optimization data link layer error control hybrid automat

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A Novel Self Organizing Framework for adaptive Frequency Reuse and Deployment in Future Cellular Networks

A Novel Self Organizing Framework for Adaptive Frequency Reu...

引用

21st Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Imran, A. Imran, M. A. Tafazolli, R. Univ Surrey Ctr Commun Syst Res Guildford GU2 5XH Surrey England

ISBN: (纸本)9781424480166

Recent research on Frequency Reuse (FR) schemes for OFDM/OFDMA based cellular networks (OCN) suggest that a single fixed FR cannot be optimal to cope with spatiotemporal dynamics of traffic and cellular environments in a spectral and energy efficient way. To address this issue this paper introduces a novel Self Organizing framework for adaptive Frequency Reuse and Deployment (SO-FRD) for future OCN including both cellular (e. g. LTE) and relay enhanced cellular networks (e. g. LTE Advance). In this paper, an optimization problem is first formulated to find optimal frequency reuse factor, number of sectors per site and number of relays per site. The goal is designed as an adaptive utility function which incorporates three major system objectives;1) spectral efficiency 2) fairness, and 3) energy efficiency. An appropriate metric for each of the three constituent objectives of utility function is then derived. Solution is provided by evaluating these metrics through a combination of analysis and extensive system level simulations for all feasible FRD's. Proposed SO-FRD framework uses this flexible utility function to switch to particular FRD strategy, which is suitable for system's current state according to predefined or self learned performance criterion. The proposed metrics capture the effect of all major optimization parameters like frequency reuse factor, number of sectors and relay per site, and adaptive coding and modulation. Based on the results obtained, interesting insights into the tradeoff among these factors is also provided.

关键词： OFDM based cellular network OFDM modulation OFDMA based cellular network adaptive codes adaptive coding adaptive frequency deployment adaptive frequency reuse adaptive modulation adaptive utility function cellular environment cellular radio energy efficiency objective fairness objective flexible utility function frequency allocation frequency division multiple access future cellular network modulation coding optimal frequency reuse factor optimization problem relay enhanced cellular network self organizing framework spatiotemporal dynamics spectral efficiency objective telecommunication traffic traffic

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Optimal User Scheduling and Resource Allocation Strategy for AMC based OFDMA Systems

Optimal User Scheduling and Resource Allocation Strategy for...

引用

21st Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Al-Janabi, Muayad S. Tsimenidis, Charalampos C. Sharif, Bayan S. Le Goff, Stephane Y. Newcastle Univ Sch Elect Elect & Comp Engn Newcastle Upon Tyne NE1 7RU Tyne & Wear England

ISBN: (纸本)9781424480166

We propose a cross-layer strategy that jointly optimizes user scheduling and resource allocation for adaptive modulation and coding (AMC) based orthogonal frequency multiple access (OFDMA). The objective of this paper is to maximize the system throughput as a function of the bit error rate (BER) and the spectral efficiency based on selected modulation and coding schemes (MCSs). The proposed optimal user scheduling and resource allocation (OSRA) strategy arranges the users in distinct queues according to their priorities and selects users in an optimal manner that guarantees fair services for users among different priority levels. Moreover, it allocates the available resources optimally over the utilized sub-channels. The transmitter of the investigated AMC-OFDMA system at the assigned base station (BS) divides the transmitted OFDMA frame into sub-channels depending on the number of the considered priority levels. Simulation results show that the performance of the investigated AMC-OFDMA system based on the proposed OSRA strategy outperforms the conventional approaches.

关键词： AMC OFDM modulation OFDMA system adaptive coding adaptive modulation bit error rate cross layer strategy frequency division multiple access optimal user scheduling orthogonal frequency multiple access radiocommunication resource allocation strategy spectral efficiency

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Enhanced Lossless coding Tools of LPC Residual for ITU-T G.711.0

Enhanced Lossless Coding Tools of LPC Residual for ITU-T G.7...

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Data Compression Conference (DCC)

作者： Takehiro Moriya Yutaka Kamamoto Noboru Harada NTT Communication Science Laboratories Nippon Telegraph and Telephone Corporation Japan

ISBN: (纸本)9781424464258;9780769539942

Motivated by the rapid increase of VoIP services with G.711 for telephone speech, a new ITU-T recommendation, G.711.0 (frame-wise stateless lossless compression scheme for G.711 log PCM symbols), has been standardized. The standard scheme has several coding parts, each of which is adaptively selected depending on the characteristics of the input. Among them, the mapped domain prediction part is the one most frequently activated for normal speech signals. This part consists of linear prediction in the mapped domain and variable length coding of the prediction residual. It is useful for log-compressed/expanded signal, such as ITU-T G.711. This paper describes three newly devised enhancement tools for the coding of prediction residual signals: progressive order prediction, quantized prediction order, and adaptive and sub-frame base coding for separation parameters. The design criterion is the maximization of the averaged FoM (figure of merit) over frame lengths of 40, 80, 160, 240, and 320 samples. The first tool, progressive order prediction associated with the adaptive modification of the separation parameter for the first and second samples, enhances the compression ratio by 0.5 % with a negligible increase of the complexity. The second tool, quantized prediction order, improves the compression ratio by 0.2 % with even reduced complexity. The third tool, sub-frame base adaptive coding of separation parameters, gives a 0.2 % improvement in the compression ratio with comparable complexity. All three schemes are consistently and independently effective for improving the compression ratio, although the amount of improvement with each tool is small. At the same time, none of the tools have any significant impact on computational complexity. Therefore, all the devised tools improve the FoM and have been adopted in the mapped domain prediction part of the ITU-T G.711.0 standard.

关键词： Linear predictive coding Internet telephony Data compression Laboratories Telegraphy Speech enhancement Speech coding Phase change materials adaptive coding Computational complexity

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Ultra low bit rate video coding for surveillance system

Ultra low bit rate video coding for surveillance system

引用

International Conference on Green Circuits and Systems (ICGCS)

作者： Muchen Li Xin Jin Satoshi Goto Graduate School of Information Production and System Waseda University Kitakyushu Japan Information Technology Research Organization Waseda University Kitakyushu Japan

In surveillance systems, ultra low bit rate video coding is necessary to reduce the storage and bandwidth consumption, especially for high definition video coding. This paper proposes a new architecture to further reduce the bit rate than H.264/AVC. The algorithm of detecting the difference of the adjacent frames and skipping the static frames in the original video is proposed. Moreover, this paper presents an adaptive coding method to code the active regions with traditional slices and background with the proposed S slice respectively. The S slice contains less syntax elements than the conventional P slice. The simulation results demonstrate that great bit reduction is achieved by these two schemes.

关键词： Bit rate Video coding Surveillance Video compression Automatic voltage control adaptive coding Encoding Cameras Bandwidth High definition video

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adaptive HARQ for imperfect channel knowledge

Adaptive HARQ for imperfect channel knowledge

引用

International ITG Conference on Source and Channel coding (SCC)

作者： Stephan Pfletschinger Monica Navarro Centre Tecnològic de Telecomunicacions de Catalunya Barcelona Spain

We consider a link adaptation scheme with adaptive coding and modulation and adaptive retransmissions on a block fading channel. Therefore, we characterize the performance of the employed channel code with puncturing and repetition coding in a unified way and use this description to devise a method to adapt modulation and code rate in the initial transmission as well as in all retransmissions. We evaluate the performance of two adaptation strategies and compare them to the throughput-optimum and a simple scheme with fixed-length retransmissions.

关键词： Modulation coding Delay Radio transmitters Feedback adaptive coding Fading Channel state information Degradation Dynamic scheduling Redundancy

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adaptive Modulation and coding for MIMO Systems with V-BLAST Detection

Adaptive Modulation and Coding for MIMO Systems with V-BLAST...

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IEEE Conference on Vehicular Technology (VTC)

作者： Guoquan Lu Baojin Li He Wang Yang Song Dacheng Yang Wireless Theories and Technologies Laboratory WT&T Beijing University of Posts and Telecommunications China

There have been great efforts to study the adaptive MIMO systems, while all of them concentrate on the systems without channel coding. This paper presents a new adaptive V-BLAST scheme adopting turbo-codes as the channel coding. This new scheme divides the optimization problem into two steps which simplifies the design greatly. Also, through this two-step method, we derive two algorithms for fixed rate and variable rate applications respectively. We combine the bit and power allocation with antenna selection effectively with very low complexity through a new ordering scheme and derive a simplified power allocation algorithm. For adaptive coding, we propose a new metric - Equivalent Capacity SNR, which can indicate the overall channel condition, to select the proper coding scheme. Simulation results show that the algorithms for fixed rate and variable rate both provide very good throughput performance with low complexity and less feedback information.

关键词： Modulation coding MIMO Channel coding Throughput adaptive coding Feedback adaptive arrays Turbo codes Design optimization Transmitting antennas

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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...

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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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Lossless bit-plane compression of images with context tree modeling

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

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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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adaptive Modulation and coding for V-Blast Systems

Adaptive Modulation and Coding for V-Blast Systems

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

作者： Guoquan Lu He Wang Dacheng Yang Wireless Theories and Technologies Lab (WT&T) Beijing University of Posts and Telecommunications Beijing China

There have been great efforts to study the adaptive MIMO systems, while all of them concentrate on the systems without channel coding. This paper presents a new adaptive V-BLAST scheme adopting turbo-codes as the channel coding. Through a two-step method, we derive two algorithms for fixed rate and variable rate applications respectively. We derive a close- form bit and power allocation algorithm which reduces the computation complexity greatly by avoiding exhaustive search. For adaptive coding, we propose the Average SNR mapping method to select the proper coding scheme. Simulation results show that the algorithms for fixed rate and variable rate both provide very good throughput performance with low complexity and less feedback information.

关键词： Modulation coding MIMO Channel coding Throughput Feedback Mobile communication Turbo codes adaptive coding Computational modeling Transmitters

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