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检索条件"主题词=joint source-channel coding"

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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...

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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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On Separation of source and channel coding in the Finite Block Length Regime

On Separation of Source and Channel Coding in the Finite Blo...

引用

13th Canadian Workshop on Information Theory (CWIT)

作者： Ho, James Meng, Jin Yang, En-hui Univ Waterloo Dept Elect & Comp Engn Waterloo ON N2L 3G1 Canada

ISBN: (纸本)9781479906345

This paper investigates the validity of Shannon's separation theorem in the finite block length regime. Under optimal tradeoffs between source rate and channel block error probability obtained from finite block length analysis, noisy channel quantizers based on joint source-channel coding principles are shown to outperform the separate quantizer designed via Lloyd-Max in terms of end-to-end distortion. Numerical results for the scalar case under the binary symmetric channel and discrete-input memoryless channel demonstrate that the separation of source and channel coding no longer holds in the finite block length regime, but the advantages of joint designs may be large or small depending on the system configuration.

关键词： joint source-channel coding finite block length regime lossy source coding end-to-end distortion

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Minimum Distortion Network Code Design for source coding Over Noisy channels

Minimum Distortion Network Code Design for Source Coding Ove...

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19th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： Park, Moonseo Kim, Seong-Lyun Yonsei Univ Sch Elect & Elect Engn Radio Resource Management & Optimizat Lab Seoul 120749 South Korea

ISBN: (纸本)9781424426430

The XOR network code is widely used in the conventional network coding. However, when the channel is noisy, the XOR code is suboptimal in terms of minimizing distortion in the source signal. We propose to use a new network code for the two-way relay channel, designed to minimize signal distortion due to the channel noise. We assume the source signal X is encoded by a source encoder and the sequence of symbols is transmitted over the two-way relay channel with noise. The received sequence of symbols may be corrupted by the channel noise, and X, the estimation of X, may be different from X. We design a new network code which minimizes the distortion between X and X. To provide an algorithm to obtain a network code with minimum distortion, we define the expected distortion associated with a network code. Starting with the XOR network code, we iteratively optimize the network code to obtain smaller expected distortion, while maintaining the Latin square constraint of the network code. New network code achieves substantial performance gain over the XOR network code.

关键词： Index assignment joint source-channel coding Latin square network coding

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joint source and space-time block coding for MIMO video communications

Joint source and space-time block coding for MIMO video comm...

引用

60th IEEE Vehicular Technology Conference

作者： Lin, S Stefanov, A Wang, Y Polytech Univ Dept Elect & Comp Engn Brooklyn NY 11201 USA

ISBN: (纸本)0780385217

The problem of efficient video communications over MIMO wireless systems is of great significance, due to the high capacity of the multiple antenna system. The high data rates provided by the MIMO system can be traded off with diversity gain by using different, channel coding schemes. Also, by using different video source coding methods, high compression gain can be traded off with the. error resilience gain. One should jointly consider source coding and channel coding when designing a MIMO wireless video system. However, little is known so far about what. combinations of channel coding and source coding methods have the best overall performance in a MIMO system. In this paper, by comparing the performances of several different,. typical combinations through both theoretical and simulation studies, we show that, no single combination is the best for the entire range of channel conditions, rather different combinations may be best for a sub-range.

关键词： space-time coding MIMO video coding joint source-channel coding

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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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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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