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Iterative Joint source-channel Decoding Aided Transmission of Losslessly Compressed Video

Iterative Joint Source-Channel Decoding Aided Transmission o...

引用

IEEE Wireless Communications and Networking Conference (WCNC)

作者： Zhu, Chuan Huo, Yongkai Maunder, Rob G. Kawade, Santosh Hanzo, Lajos Univ Southampton Sch ECS Southampton SO17 1BJ Hants England

ISBN: (纸本)9781467359399;9781467359382

Iterative source-channel decoding (IS CD) exploits the residual redundancy of the source by iteratively exchanging extrinsic information with the channel codecs to achieve robust transmission. In this treatise we propose a video codec suitable for lossless video compression and IS CD. At the encoder the spatio-temporal redundancy is partially removed at a low complexity by simply evaluating the frame difference (FD), which is then variable-length encoded (VLC). At the receiver we invoke a three-stage concatenated IS CD scheme for exploiting the residual redundancy of the FD. A Markov Random Field (MRF) model based soft-in-soft-out (SISO) module is proposed for exploiting the spatial correlations amongst the adjacent video pixels, using intra-frame coding. More explicitly, the VLC SISO decoder operates by exchanging soft information with both the MRF module and the soft channel decoder. The convergence of the three-stage iterative decoding process is examined using 3D extrinsic information transfer (EXIT) charts. Finally, we show that our system exhibits a substantial E-b/N-O improvement of about 5.2 dB compared to the corresponding benchmarker schemes.

关键词： Markov processes combined source-channel coding concatenated codes convergence of numerical methods correlation methods data compression iterative decoding variable length codes video codecs video coding

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Iterative Joint source-Relay channel Decoding for the Noisy Decode-and-Forward Protocol

Iterative Joint Source-Relay Channel Decoding for the Noisy ...

引用

IEEE 78th Vehicular Technology Conference (VTC Fall)

作者： Fares, Haifa Langlais, Charlotte Inst TELECOM TELECOM Bretagne Dept Elect Brest France

ISBN: (纸本)9781467361873

In cooperative networks, despite its simplicity, the decode-and-forward protocol suffers from the problem of error propagation when the source-relay channel is noisy. By forwarding erroneous decoded messages, the relay significantly degrades the diversity order of the system. One trivial solution was to restrict the use of decode-and-forward protocol to reliable source-relay transmissions. However, the forwarded messages from the relay can be seen as data correlated with that transmitted by the source. This property can be exploited in order to allievate the error propagation phenomenon. The problem of joint decoding of correlated sources is then directly transposed to the relay network. In this paper, we propose to exploit the potential correlation existing between the source and the relay messages in order to achieve enhanced end-to-end performance. Performance comparison with classical decoding of the decode-and-forward protocol is conducted especially under degraded source-relay channel conditions. We derive an analytical upper bound on the probability of error at the destination, which is verified by simulation results.

关键词： combined source-channel coding decode and forward communication iterative decoding protocols relay networks (telecommunication)

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Joint source-channel coding for MPEG-4 streams transmission over 3G networks

Joint source-channel coding for MPEG-4 streams transmission ...

引用

International Conference on Wireless Communications, Networking and Mobile Computing

作者： Fang, ZJ Xu, SH Wan, CX Wu, SQ Wang, ZY Zeng, WM Jiangxi Univ Finance & Econ Sch Informat Technol Nanchang Peoples R China

ISBN: (纸本)078039335X

The aim of the 3rd generation networks is to combine the multimedia services over Internet and provide them on wireless mobile platforms. The stability, interoperability and robustness offered by MPEG-4 (Moving Picture Experts Group) make it an ideal solution for mobile networks, and it has been selected by 3GPP (the 3rd Generation Partnership) and 3GPP2 for 3G phones. Burst and random bit errors introduced by fading channels will degrade MPEG-4 streams. Conventional error correcting techniques cannot correct these errors. In this paper, a JSCC (joint source-channel coding) method based on MPEG-4 system and Turbo coder has been proposed. The critical important MPEG-4 streams such as the BIFS (Binary Format for Scenes), OD (Object Descriptors) and IOD (Initial Object Descriptors) streams are transmitted by using TCP (Transmission Control Protocol), and MPEG-4 audio/video ES (Elementary Streams) are transmitted by using UDP (User Datagram Protocol) over 3G channels. Transmission UDP packets is adopted UEP (Unequal Error Protection) Turbo codes according to MPEG-4 audio/video data partitioning. Simulation results show that this method can effectively improve the performance.

关键词： MPEG 4 Standard combined source-channel coding third generation Multimedia services Moving Pictures Experts Group channel coding 3GPP2 streams rivers mobile networking Fading channels

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Joint source-channel coding for quasi-static fading channels with noisy quantized feedback

Joint source-channel coding for quasi-static fading channels...

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IEEE Information Theory Workshop

作者： Etemadi, Farzad Ekbatani, Siavash Jafarkhani, Hamid Univ Calif Irvine Dept EECS Ctr Pervas Comm & Comp Irvine CA 92697 USA Univ Calif Irvine Dept EECS Irvine CA 92697 USA

ISBN: (纸本)9781424415632

We consider the transmission of a complex Gaussian source over a single-input multiple-output (SIMO) quasi-static fading channel. The goal is to minimize the expected distortion of the reconstructed signal at the receiver. A delay-limited scenario is assumed where channel coding is restricted to a single realization of the channel. Quantized channel state information at the transmitter (CSIT) is obtained using a noisy, fixed-rate feedback link and is used to adjust the transmission rate and power. A channel optimized scaler quantizer (COSQ) is designed to incorporate the effects of the errors in the feedback link. For a high quality feedback channel, the proposed COSQ performs close to the noiseless feedback case, while its performance converges to the no-feedback scenario as the feedback channel quality degrades. We show that noisy feedback does not improve the performance at asymptotically high signal to noise ratios (SNRs). Nevertheless, the numerical results for a Rayleigh fading channel show that noisy feedback provides significant gains for practical values of the SNR.

关键词： Raleigh fading channels Feedback Fading channels combined source-channel coding channel coding feedback channel

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Turbo decoding of hidden Markov sources with unknown parameters

Turbo decoding of hidden Markov sources with unknown paramet...

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Data Compression Conference

作者： Garcia-Frias, J Villasenor, JD Univ Calif Los Angeles Dept Elect Engn Los Angeles CA 90024 USA

ISBN: (纸本)0818684062

We describe techniques for joint source-channel coding of hidden Markov sources using a modified turbo decoding algorithm. This avoids the need to perform any explicit source coding prior to transmission, and instead allows the decoder to utilize the a priori structure due to the hidden Markov source. In addition, we present methods that allow the decoder to estimate the parameters of the Markov model. In combination, these techniques allow the decoder to identify, estimate, and exploit the source structure. The estimation does not degrade the performance of the system, i.e. the joint estimation/decoding allows convergence at the same noise levels as a system in which the decoder has perfect a priori knowledge of the source parameters.

关键词： decoders Markov models Markov Unknown parameter Noise levels Turbo Worm gears combined source-channel coding DEcoding System performance

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channel symmetry in Slepian-Wolf code design based on LDPC codes with application to the quadratic Gaussian Wyner-Ziv problem

Channel symmetry in Slepian-Wolf code design based on LDPC c...

引用

IEEE Information Theory Workshop

作者： Cheng, S Xiong, ZX Texas A&M Univ Dept Elect Engn College Stn TX 77843 USA

ISBN: (纸本)0780387201

We consider Slepian-Wolf code design (or source coding with side information) based on LDPC codes. We show that density evolution defined in conventional channel coding can be used in analyzing the Slepian-Wolf coding performance provided that certain symmetry condition, dubbed dual symmetry, is satisfied by the hypothetical channel between the source and the side information. Exploiting such an analysis, we design an efficient LDPC code based Slepian-Wolf coding scheme and apply it to the quadratic Gaussian Wyner-Ziv problems.

关键词： combined source-channel coding parity check codes Gaussian channels channel symmetry Slepian-Wolf code design LDPC codes quadratic Gaussian Wyner-Ziv problem source coding side information density evolution channel coding coding performance dual symmetry hypothetical channel source coding channel coding combined source-channel coding parity check codes Gaussian channels side information

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Layered source-channel coding Over Two-Way Relay Networks

Layered Source-Channel Coding Over Two-Way Relay Networks

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IEEE 78th Vehicular Technology Conference (VTC Fall)

作者： Bi, Chongyuan Liang, Jie Simon Fraser Univ Sch Engn Sci Burnaby BC V5A 1S6 Canada

ISBN: (纸本)9781467361873

In this paper, we study the performances of various layered source-channel coding schemes over two-way relay networks, where the sources are coded into different layers and transmitted by progressive coding or superposition coding. The two-way relay network employs multiple-access-broadcast or time-division-broadcast protocol, and the relay uses decode-and-forward (DF) protocol. We first derive the optimal distortion exponents of different schemes at high signal-to-noise ratios (SNRs). Fast resource allocation algorithms are then developed to optimize the expected distortion of the source at finite SNRs. Simulation results show that layered coding achieves better performance than single rate coding, and the proposed fast resource allocation scheme is near-optimal.

关键词： combined source-channel coding decode and forward communication protocols relay networks (telecommunication) resource allocation

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Broadcasting with fidelity criteria

Broadcasting with fidelity criteria

引用

IEEE Information Theory Workshop

作者： Sarshar, N Wu, XL McMaster Univ Dept Elect & Comp Engn Hamilton ON Canada

ISBN: (纸本)0780387201

Consider the problem of broadcasting an i.i.d. source sequence X = {X-i}(i=1)(N) (possibly N --> infinity) to n listeners over a discrete broadcast channel, consisting of n channels with capacities C-1 = C-max greater than or equal to C-2 greater than or equal to ... greater than or equal to C-n = C-min. Let the tuple D = (D-1, D-2,..., D-n) represent the average distortion in reconstructing sources at the n listerners. The problem of characteriziing all achievable tuples D is till open for a general case. for a fairly general class of discrete channels, we prove the achievability of the tuple Q(n) (rho(1), rho(2),..., rho(n)) = (D-X(rho(1)C(1) - zeta), D-X(rho(1)C(2) - zeta),..., D-X(rho(n)C(n) - zeta)), provided that lambda(i) = (rho(i)C(i) - rho(i+1)C(i+1))/C-i > 0, for 1 less than or equal to i less than or equal to n - 1, lambda(n) = rho(n) and Sigma(i=1)(n-1) lambda(i) less than or equal to 1, where D-X(R) is the distortion rate function of X. The penalty term zeta = 1/2 for a gernal source with real alphabets and is zeta = 0 if X is progressisely refinable. The factor 0 less than or equal to rho(i) less than or equal to 1 is call the utilization of the ith channel. As an example, for n = 2, we show that Q(2)(1/(2 - C-2/C-1), 1/(2 - C-1/C-2)) is achievable for any C-1, C-2. Furthermore , the common utilization of rho = (1 + In(C-max/C-min))(-1) is shown to be achievable for al channels. Conversely, we find examples of channels namely erasure switch-to-talk channels, for which the proposed achievable utilizations are tight. In particular, while Q(3)(2/3, 2/3, 2/3) is achievable for any compatible broadcast channel with capacities C-1 = 2C(2) = 2C(3), for any delta > 0, we find examples of channels for which Q(3)(2/3 + delta, 2/3 + delta, 2/3 + delta) is not achievable.

关键词： broadcast channels rate distortion theory error correction codes sequences channel capacity combined source-channel coding broadcasting fidelity criteria i.i.d. source sequence discrete broadcast channel channel capacities average distortion source reconstruction discrete channels distortion rate function channel utilization erasure switch-to-talk channels channel capacity broadcast channels discrete channel average distortion broadcasting combined source-channel coding Rate distortion theory realizable Secretory Rate Excretory rate sup AP5Z1 gene

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A Self-Attention Network for Deep JSCCM: The Design and FPGA Implementation

A Self-Attention Network for Deep JSCCM: The Design and FPGA...

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IEEE Global Communications Conference (GLOBECOM)

作者： Fujimaki, Shohei Inoue, Yoshiaki Hisano, Daisuke Maruta, Kazuki Nakayama, Yu Hara-Azumi, Yuko Tokyo Inst Technol Sch Engn Tokyo Japan Osaka Univ Grad Sch Engn Osaka Japan Tokyo Univ Sci Dept Elect Engn Tokyo Japan Tokyo Univ Agr & Technol Inst Engn Tokyo Japan

ISBN: (纸本)9781665435406

The deep joint source-channel coding and modulation (JSCCM) is a promising technology to realize efficient communication over extreme environments such as underwater area. In previous works, it is shown that deep convolutional neural networks (CNN) can successfully learn JSCCM encoder and decoder, outperforming conventional separation-based coding and modulation schemes in low signal-to-noise ratio settings. This paper proposes a new architecture for deep JSCCM based on the self-attention mechanism. We show that the proposed architecture achieves significant performance improvement compared with the CNN-based schemes while requiring a smaller network size in terms of the number of weight parameters. Furthermore, we present efficient hardware implementation of the proposed JSCCM encoder on a field programmable gate array (FPGA). In particular, we demonstrate that a systolic-array-like structure is effective for FPGA implementation of the proposed JSCCM scheme based on the self-attention mechanism.

关键词： combined source-channel coding field programmable gate array image coding deep learning underwater communication

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Results on Combinatorial Joint source-channel coding

Results on Combinatorial Joint Source-Channel Coding

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IEEE Information Theory Workshop (ITW)

作者： Kochman, Yuval Mazumdar, Arya Polyanskiy, Yury Hebrew Univ Jerusalem Sch Comp Sci & Engn Jerusalem Israel MIT Dept Elect Engn & Comp Sci Cambridge MA 02139 USA

ISBN: (纸本)9781467302234;9781467302241

This paper continues the investigation of the combinatorial formulation of the joint source-channel coding problem. In particular, the connections are drawn to error-reducing codes, isometric embeddings and list-decodable codes. The optimal performance for the repetition construction is derived and is shown to be achievable by low complexity Markov decoders. The compound variation of the problem is proposed and some initial results are put forward.

关键词： combined source-channel coding optimum performance channel coding realizable Codes decoders

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