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8th International Symposium on Telecommunications (IST)

作者： Setayesh, Mehdi Behroozi, Hamid Khalaj, Babak H. Sharif Univ Technol Dept Elect Engn Tehran Iran

ISBN: (纸本)9781509034352

In this paper, we consider the problem of sending a bivariate correlated Gaussian source through a two-user Gaussian orthogonal multiple-access channel (MAC), where each encoder observes a noisy version of one of the source components, and the receiver aims at reconstructing each source component. The estimation quality is measured by mean-squared error (MSE) distortion criterion. Different components of the source have their own fidelity requirements instead of total or average distortion measure. It is easy to verify that for this problem, digital communication has an optimal performance. However, it is not explicit that when there is a constraint on the total power budget, what power allocation reaches the optimal power-distortion trade-off. This paper determines the power allocated to each encoder in the digital communication setting. Furthermore, we also analyze the performance of uncoded transmission scheme which has considerably lower complexity and delay than source-channel separation scheme.

关键词： joint source-channel coding correlated sources uncoded transmission power allocation

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On the Energy-Distortion Tradeoff for the Gaussian Broadcast Problem

On the Energy-Distortion Tradeoff for the Gaussian Broadcast...

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IEEE International Symposium on Information Theory (ISIT)

作者： Koken, Erman Tuncel, Ertem Univ Calif Riverside Riverside CA 92521 USA

ISBN: (纸本)9781509018062

The energy-distortion tradeoff for the transmission of a white Gaussian source over the additive white Gaussian broadcast channel is investigated by translating the known upper and lower bounds into the infinite bandwidth regime. While a gap continues to exist between the bounds in this regime, it is shown that in a certain region on the distortion plane, the energy difference between the best known upper and lower bounds is quantifiably small.

关键词： Broadcast channels energy-distortion tradeoff energy-limited transmission joint source-channel coding

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A Measure for the Missed Error Detection Probability for Optimizing the Forbidden Symbol Configuration in joint source-channel Arithmetic Codes

A Measure for the Missed Error Detection Probability for Opt...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Kourkchi, Hossein Lynch, William E. Ahmad, M. Omair Concordia Univ Dept Elect & Comp Engn 1455 Maisonneuve Blvd W Montreal PQ H3G 1M8 Canada

ISBN: (纸本)9781479953417

In joint source-channel arithmetic coding, a forbidden symbol (FS) is added to the symbol set to make it more robust against transmission errors. By splitting the interval occupied by the FS into subintervals, various configurations are possible. In this paper, the delay probability function (DPF), the probability of the number of bits required to detect an error, is calculated for various FS configurations. A figure of merit is also proposed for optimizing the FS configuration. It determines the probability of missed error detection (PMD). Simulations are carried out by employing a breadth-first suboptimal sequential MAP. The simulation results show the effectiveness of the proposed figure of merit, and support the FS configuration in which the FS interval lies entirely between the other information carrying symbols to be the best.

关键词： Arithmetic coding maximum a posteriori (MAP) joint source-channel coding missed error detection

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Novel joint source-channel coding for Wireless Transmission of Radiography Images

Novel Joint Source-Channel Coding for Wireless Transmission ...

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32nd Annual International Conference of the IEEE Engineering-in-Medicine-and-Biology-Society (EMBC 10)

作者： Watanabe, Katsuhiro Takizawa, Kenichi Ikegami, Tetsushi Meiji Univ Sch Sci & Technol Kanagawa 2148571 Japan Natl Inst Informat & Commun Technol Kanagawa 2340847 Japan

ISBN: (纸本)9781424441242

A wireless technology is required to realize robust transmission of medical images like a radiography image over noisy environment. The use of error correction technique is essential for realizing such a reliable communication, in which a suitable channel coding is introduced to correct erroneous bits caused by passing through a noisy channel. However, the use of a channel code decreases its efficiency because redundancy bits are also transmitted with information bits. This paper presents a joint source-channel coding which maintains the channel efficiency during transmission of medical images like a radiography image. As medical images under the test, we use typical radiography images in this paper. The joint coding technique enjoys correlations between pixels of the radiography image. The results show that the proposed joint coding provides capability to correcting erroneous bits without increasing the redundancy of the codeword.

关键词： channel efficiency combined source-channel coding correcting erroneous bits diagnostic radiography error correction error correction technique image coding joint source-channel coding medical image processing noisy channel radiography images wireless transmission

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Improving the Simulated Annealing Algorithm for source Codeword Index Assignment by Using the Mechanism of Tabu Search Algorithm

Improving the Simulated Annealing Algorithm for Source Codew...

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International Conference on Advanced Technologies for Communications (ATC)

作者： Tran Ngoc Tuan Nguyen Quoc Trung Tran Nguyen Khanh Hanoi Univ Sci & Technol Sch Elect & Telecommun Hanoi Vietnam Univ Hanoi Fac Informat Technol Hanoi Vietnam

ISBN: (纸本)9781509027118

channel-optimized Index Assignment (IA) of source codewords is the simple but effective approach of improving the error resilience of the communication systems. Although IA is a type of joint source channel coding (JSCC), it does not intervene with the source codec design. So, in addition to the fact that this method can be used in designing systems effectively, it can be also applied to the existing system. In the past, several methods and algorithms were developed for the IA problem. Among these IA algorithms, Simulated Annealing (SA) algorithm is the most effective and popular algorithm with fast convergence time, wide use in optimization problems in general and issue of IA problem in particular and has been continuously improved. In this paper, we focus on the MSA algorithm, one of the latest improved versions of SA for the IA problem and improved the MSA algorithm by using the mechanism of TS algorithm in order to avoid repeated searches. We also proposed the modified structure Tabu list applied to the new algorithm in order to extend the searching space and to enhance the algorithm performance. The effectiveness of the proposed method is confirmed through experiments.

关键词： joint source-channel coding Index Assignment Vector Quantization Simulated Annealing Tabu Search..

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On Robustness of Hybrid Digital/Analog source-channel coding With Bandwidth Mismatch

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IEEE TRANSACTIONS ON INFORMATION THEORY 2015年第9期61卷 4968-4983页

作者： Koeken, Erman Tuncel, Ertem Univ Calif Riverside Dept Elect & Comp Engn Riverside CA 92521 USA

For transmission of memoryless Gaussian sources over channels with additive white Gaussian noise, the tradeoff between the distortion when the channel quality is good versus bad is investigated under the constraint that the distortion is optimal when the channel has the targeted median quality. The problem was proposed by Tian and Shamai, who subsequently proved remarkable achievability results for bandwidth expansion ratios kappa, which are integers or unit fractions, i.e., kappa = 2, 3, 4, ... or kappa = 1/2, 1/3, 1/4, ... Their result is extended here to all kappa >= 2 and kappa <= 1/2 by generalizing the hybrid digital/analog (HDA) scheme of Wilson et al. to the case of bandwidth mismatch. Finally, novel schemes are proposed for 1/2 <= kappa < 1 and 1 < kappa <= 2 achieving nontrivial tradeoffs outperforming all known schemes. These latter schemes rely on another extension of the HDA scheme by Wilson et al., namely, the relaxation of the independence of source and channel input sequences.

关键词： Bandwidth mismatch hybrid digital/analog coding joint source-channel coding robustness

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

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

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IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Mustafa Said Mehmetoglu Emrah Akyol Kenneth Rose Electrical and Computer Engineering University of California Santa Barbara CA 93106 USA Coordinated Science Laboratory University of Illinois at Urbana-Champaign Urbana IL 61801 USA

ISBN: (纸本)9781479999897

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 Combined source-channel coding channel spacing MAPPING(MATHEMATICAL) Analog optimization method Structural properties code and decode

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Irregular Trellis for the Near-Capacity Unary Error Correction coding of Symbol Values From an Infinite Set

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IEEE TRANSACTIONS ON COMMUNICATIONS 2015年第12期63卷 5073-5088页

作者： Zhang, Wenbo Brejza, Matthew F. Wang, Tao Maunder, Robert G. Hanzo, Lajos Univ Southampton Sch Elect & Comp Sci Southampton SO17 1BJ Hants England

Irregular joint source and channel coding (JSCC) scheme is proposed, which we refer to as the irregular unary error correction (IrUEC) code. This code operates on the basis of a single irregular trellis, instead of employing a set of separate regular trellises, as in previous irregular trellis-based codes. Our irregular trellis is designed with consideration of the UEC free distance, which we characterize for the first time in this paper. We conceive the serial concatenation of the proposed IrUEC code with an irregular unity rate code (IrURC) code and propose a new EXtrinsic Information Transfer (EXIT) chart matching algorithm for parametrizing these codes. This facilitates the creation of a narrow EXIT tunnel at a low E-b/N-0 value and provides near-capacity operation. Owing to this, our scheme is found to offer a low symbol error ratio (SER), which is within 0.4 dB of the discrete-input continuous-output memoryless channel (DCMC) capacity bound in a particular practical scenario, where gray-mapped quaternary phase shift keying (QPSK) modulation is employed for transmission over an uncorrelated narrowband Rayleigh-fading channel with an effective throughput of 0.508bit s(-1) Hz(-1). Furthermore, the proposed IrUEC-IrURC scheme offers a SER performance gain of 0.8 dB, compared to the best of several regular and irregular separate source and channel coding (SSCC) benchmarkers, which is achieved without any increase in transmission energy, bandwidth, transmit duration, or decoding complexity.

关键词： joint source-channel coding irregular codecs channel capacity iterative decoding

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A Unified Approach to Hybrid coding

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IEEE TRANSACTIONS ON INFORMATION THEORY 2015年第4期61卷 1509-1523页

作者： Minero, Paolo Lim, Sung Hoon Kim, Young-Han Univ Notre Dame Dept Elect Engn Notre Dame IN 46556 USA Qualcomm Inc San Diego CA 92121 USA Ecole Polytech Fed Lausanne Sch Comp & Commun Sci CH-1015 Lausanne Switzerland Univ Calif San Diego Dept Elect & Comp Engn San Diego CA 92093 USA

Hybrid analog-digital coding has been used for several communication scenarios, such as joint source-channel coding of Gaussian sources over Gaussian channels and relay communication over Gaussian networks. In this paper, a generalized hybrid coding technique is proposed for communication over discrete memoryless and Gaussian systems, and its utility is demonstrated via three examples-lossy joint source-channel coding over multiple access channels, channel coding over two-way relay channels, and channel coding over diamond networks. The corresponding coding schemes recover and extend several existing results in the literature.

关键词： Analog-digital coding hybrid coding joint source-channel coding network information theory relay networks

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Multiview coding and error correction coding for 3D video over noisy channels

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SIGNAL PROCESSING-IMAGE COMMUNICATION 2015年 30卷 107-120页

作者： Vosoughi, Arash Testoni, Vanessa Cosman, Pamela C. Milstein, Laurence B. Univ Calif San Diego Dept Elect & Comp Engn La Jolla CA 92093 USA

We consider the joint source-channel coding problem of stereo video transmitted over AWGN and flat Rayleigh fading channels. Multiview coding (MVC) is used to encode the source, as well as a type of spatial scalable MVC. Our goal is to minimize the total number of bits, which is the sum of the number of source bits and the number of forward error correction bits, under the constraints that the quality of the left and right views must each be greater than predetermined PSNR thresholds at the receiver. We first consider symmetric coding, for which the quality thresholds are equal. Following binocular suppression theory, we also consider asymmetric coding, for which the quality thresholds are unequal. The optimization problem is solved using both equal error protection (EEP) and a proposed unequal error protection (UEP) scheme. An estimate of the expected end-to-end distortion of the two views is formulated for a packetized MVC bitstream over a noisy channel. The UEP algorithm uses these estimates for packet rate allocation. Results for various scenarios, including non-scalable/scalable MVC, symmetric/asymmetric coding, and UEP/EEP, are provided for both AWGN and flat Rayleigh fading channels. The UEP bit savings compared to EEP are given, and the performances of different scenarios are compared for a set of stereo video sequences. (C) 2014 Elsevier B.V. All rights reserved.

关键词： joint source-channel coding Multiview video coding Unequal error protection Scalable coding Asymmetric coding

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