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检索条件"主题词=joint source-channel coding"

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Correlation, coding, and cooperation in wireless sensor networks

引用

3rd International Workshop on Algorithmic Aspects of Wireless Sensor Networks

作者： Agnihotri, Samar Nuggehalli, Pavan Jamadagni, H. S. Indian Inst Sci CEDT Bangalore 560012 Karnataka India

ISBN: (纸本)9783540778707

We consider a single-hop data-gathering sensor network, consisting of a set of sensor nodes that transmit data periodically to a base-station. We are interested in maximizing the lifetime of this network. With our definition of network lifetime and the assumption that the radio transmission energy consumption forms the most significant portion of the total energy consumption at a sensor node, we attempt to enhance the network lifetime by reducing the transmission energy budget of sensor nodes by exploiting three system-level opportunities. We pose the problem of maximizing lifetime as a max-min optimization problem subject to the constraint of successful data collection and limited energy supply at each node. This turns out to be an extremely difficult optimization to solve. To reduce the complexity of this problem, we allow the sensor nodes and the base-station to interactively communicate with each other and employ instantaneous decoding at the base-station. The chief contribution of the paper is to show that the computational complexity of our problem is determined by the complex interplay of various system-level opportunities and challenges.

关键词： sensor networks lifetime maximization multi-access networks joint source-channel coding data correlation Slepian-Wolf coding scheduling

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Rate-distortion optimized bit allocation for wireless video coding

Rate-distortion optimized bit allocation for wireless video ...

引用

6th IEEE Circuits and Systems Symposium on Emerging Technologies

作者： Zhang, W Zhou, YH Shanghai Jiao Tong Univ Inst Image Commun & Informat Proc Shanghai 200030 Peoples R China

ISBN: (纸本)0780379381

For two-way video communications over wireless channel using the automatic repeat request (ARQ) retransmission scheme, TMN8 rate control scheme is not effective to minimize the number of frames skipped and guarantee video quality during the retransmissions of error packets. This paper presents a joint source channel rate-distortion optimized bit allocation scheme that allocates target bits according to encoder buffer fullness and estimation of channel condition by retransmission information. The results obtained from implementation our scheme in H.263+ coder over wireless channel model show that our proposed scheme encodes the video sequences with lower and steadier buffer delay, fewer frames skipped and higher average PSNR compared to TMN8.

关键词： ARQ bit allocation channel model error-prone channel joint source-channel coding

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Use of concatenated FEC coding for real-time packet video over heterogeneous wired-to-wireless IP networks

Use of concatenated FEC coding for real-time packet video ov...

引用

IEEE International Symposium on Circuits and Systems

作者： Pei, Y Modestino, JW Univ Miami Dept Elect & Comp Engn Coral Gables FL 33124 USA

ISBN: (纸本)0780377613

In this paper, we address the problem of robust packet video transmission over heterogeneous wired-to-wireless IP networks. We propose the use of a concatenated FEC coding scheme employing interlaced Reed-Solomon (RS) codes and rate-compatible punctured convolutional (RCPC) codes to protect the video data from packet loss and bit errors, respectively. Furthermore, the performance of a joint source-channel coding (JSCC) approach employing this concatenated FEC coding scheme for video transmission is also studied. Results indicate that with an appropriate JSCC approach, concatenated FEC-based error-control techniques together with passive error-recovery techniques can significantly improve the effective video throughput and lead to acceptable video delivery quality over time-varying heterogeneous wired-to-wireless IP networks.

关键词： video transmission RTP UDP/IP RS codes RCPC codes joint source-channel coding H.263+

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Optimal overcomplete subband expansions for multiple description coding

Optimal overcomplete subband expansions for multiple descrip...

引用

Conference on Wavelet Applications in Signal and Image Processing VIII

作者： Mehrotra, S Microsoft Corp Redmond WA 98052 USA

ISBN: (纸本)0819437646

We study the use of overcomplete (also known as oversampled) subband expansions for multiple description coding. The system proposed uses an overcomplete subband expansion (a subband expansion in which the number of subbands is larger than the downsampling factor of each subband) followed by independent coding (quantization and coding) of each of the subbands. The entire coding of each of the subbands is entirely contained within a single description. Using analysis in the polyphase domain, we study finding frequency responses of optimal filterbanks and the rate allocation across the subbands to minimize the end-to-end reconstruction error subject to a transmission rate constraint when a distribution over channel states is known. A general analysis of the problem is given and results are shown for a 3 x 2 expansion of a first-order autoregressive process.

关键词： multiple description coding overcomplete subband expansions oversampled subband expansions overcomplete linear expansions frame expansions joint source-channel coding erasure channel coding

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Adaptive joint H.263-channel coding for memoryless binary channels

Adaptive joint H.263-channel coding for memoryless binary ch...

引用

13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： Navarro, A Tavares, J Univ Aveiro Inst Telecommun P-3810 Aveiro Portugal

ISBN: (纸本)0780375890

The main purpose of this paper is to show that once the video source coding is dependent on the channel characteristics, better performance can be achieved in terms of reconstructed video quality. Our study considers a fixed overall bit rate transmission of 64 kbit/s over error prone memoryless binary channels and the source coder is the ITU-T H.263 video standard. The variable H.263 source coding rate adapts to a particular channel Bit Error Rate (BER) at any instant of time. Firstly, we investigated the error sensitivities of H.263 syntactical elements and grouped them into several classes of different significance. By identifying the most sensitive elements, we developed a data grouping (DG) technique which by itself, exhibits improved error resilience. Secondly, we design an Unequal Error Protection (UEP) scheme and compare its performance with an equivalent (same source coding bit rate) Equal Error Protection (EEP) scheme, using Rate Compatible Punctured Convolutional (RCPC) codes of different rates for forward error protection. Both forward error correction schemes adopted have resulted in PSNR improvements, over 20 dB for BERs higher than of 4x10(-3). Finally, if during the real time encoding process, the encoder is aware of the channel BER and there is an unlimited number of code rates, this paper shows that UEP and EEP strategies provide quite similar performances.

关键词： adaptive wireless video communications forward error protection joint source-channel coding

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Dynamic rate allocation with variable quantization in multi-sensor Wyner-Ziv video coding systems

Dynamic rate allocation with variable quantization in multi-...

引用

3rd IEEE International Symposium on Control, Communications and Signal Processing (ISCCSP 2008)

作者： Yaacoub, C. Farah, J. Pesquet-Popescu, B. Holy Spirit Univ Kaslik Fac Sci & Comp Engn Jounieh Lebanon Ecole Natl Super Telecommun Bretagne Dept Signal & Image Proc Paris France

ISBN: (纸本)9781424416875

In this paper, we present a novel algorithm for dynamic quantization in distributed Wyner-Ziv video coding. In contrast with previous work where the quantization parameter is fixed and a feedback channel is used, our proposed technique relies on theoretical calculations to jointly determine the number of quantization levels along with a suitable compression rate for each video frame. It employs a cross-layer approach that dynamically allocates unequal transmission rates for different users by taking into account the amount of motion in the captured video scenes on one hand and the transmission conditions for each sensor on the other. The application of this algorithm in a wireless video sensor network shows a significant improvement in the system performance when compared to a traditional system that allocates equal channel resources with a fixed quantization parameter.

关键词： dynamic quantization joint source-channel coding rate allocation wireless video sensor network Wyner-Ziv coding

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A Linear Feedback coding Scheme for Computation Over Gaussian Multiple-Access channels

A Linear Feedback Coding Scheme for Computation Over Gaussia...

引用

IEEE International Symposium on Information Theory (ISIT)

作者： Dai, Bin Cheng, Fan Yang, Yuhan Xia, Dengfeng Southwest Jiaotong Univ Sch Informat Sci & Technol Chengdu 610031 Peoples R China Chongqing Key Lab Mobile Commun Technol Chongqing 400065 Peoples R China Southwest Jiaotong Univ Prov Key Lab Informat Coding & Transmiss Chengdu 611756 Peoples R China Shanghai Jiao Tong Univ Dept Comp Sci & Engn Shanghai 200241 Peoples R China

ISBN: (纸本)9798350382853;9798350382846

The problem of reliably reconstructing a function of sources over a multiple-access channel (MAC) is revisited by considering channel feedback. First, a linear feedback scheme is proposed to compute the average of the Gaussian sources transmitted over the Gaussian MAC. Next, numerical results show that in some cases, our proposed scheme performs better than the existing ones without using channel feedback. Finally, we show that with a slight modification, our scheme can be directly extended to compute any linear function of the Gaussian sources transmitted over the Gaussian MAC.

关键词： channel feedback distributed computation Gaussian multiple-access channel joint source-channel coding Schalkwijk-Kailath scheme

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UNEQUAL LOSS-PROTECTED MULTIPLE DESCRIPTION coding OF SCALABLE source STREAMS USING A PROGRESSIVE APPROACH

UNEQUAL LOSS-PROTECTED MULTIPLE DESCRIPTION CODING OF SCALAB...

引用

16th IEEE International Conference on Image Processing

作者： Ardestani, Majid R. Aminlou, Alireza Shirazi, Ali Asghar Beheshti Iran Univ Sci & Technol Dept Elect Engn Tehran Iran Univ Tehran Dept Elect & Comp Engn Tehran Iran

ISBN: (纸本)9781424456536

An analysis-based approach for unequal loss-protected multiple description coding (packetization) of the scalable (prioritized / progressive) source code streams is proposed. For a given number of packets (descriptions) of the known size, unequal loss-protected packetization leads to segment the scalable code stream, such that the source can be reconstructed with the maximum possible fidelity at the decoder side. Here, we find an analytical relation between optimal sizes of any two consecutive segments. This idea yields a low-complexity progressive solution with a performance close to that of local search [1], which has been approved as an efficient method to solve the segmentation problem. Simulation results are used to confirm the efficiency of the proposed method as compared with the local search algorithm.

关键词： Unequal loss-protected packetization multiple description coding scalable code stream joint source-channel coding

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ANALOG MULTIPLE DESCRIPTIONS: A ZERO-DELAY source-channel coding APPROACH 41

ANALOG MULTIPLE DESCRIPTIONS: A ZERO-DELAY SOURCE-CHANNEL CO...

引用

41st IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

作者： Mehmetoglu, Mustafa Said Akyol, Emrah Rose, Kenneth Univ Calif Santa Barbara Elect & Comp Engn Santa Barbara CA 93106 USA Univ Illinois Coordinated Sci Lab Urbana IL 61801 USA

ISBN: (纸本)9781479999880

This paper extends the well-known source coding problem of multiple descriptions, in its general and basic setting, to analog source-channel coding scenarios. Encoding-decoding functions that optimally map between the (possibly continuous valued) source and the channel spaces are numerically derived. The main technical tool is a non-convex optimization method, namely, deterministic annealing, which has recently been successfully used in other mapping optimization problems. The obtained functions exhibit several interesting structural properties, map multiple source intervals to the same interval in the channel space, and consistently outperform the known competing mapping techniques.

关键词： joint source-channel coding multiple descriptions analog mappings zero-delay communications

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Adaptive coding for Two-Way Lossy source-channel Communication

Adaptive Coding for Two-Way Lossy Source-Channel Communicati...

引用

IEEE International Symposium on Information Theory (ISIT)

作者： Weng, Jian-Jia Alajaji, Fady Linder, Tamas Queens Univ Dept Math & Stat Kingston ON K7L 3N6 Canada

ISBN: (数字)9781728164328

ISBN: (纸本)9781728164328

An adaptive joint source-channel coding (JSCC) scheme is presented for transmitting correlated sources over discrete-memoryless two-way channels subject to distortion constraints. The proposed JSCC scheme makes use of the previously transmitted and received channel signals as well as the sources' correlation to facilitate coordination between terminals. It is shown that the adaptive scheme strictly subsumes prior lossy coding methods for two-way simultaneous transmission and yields a new adaptive separate source-channel coding result. Two examples are given to show the scheme's advantages.

关键词： Network information theory two-way channels lossy transmission joint source-channel coding adaptive coding

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