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15th IEEE International Symposium on Personal, Indoor, Mobile, Radio Communications (PIMRC 2004)

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

ISBN: (纸本)0780385233

In this paper, we present an adaptive scheme for forward error protection of any video coding standard. The channel coding rate changes according to the channel bit error rate (BER). The results are impressive. For instance, a PSNR gain of about 16.7 dB is obtained at BER=10(-2) for "Foreman" video sequence, encoded either by H.263 or by MPEG-I and protected using the Common scheme in comparison to the unprotected case. Being however this scheme common to all standards, it provides some acceptable video quality degradation. We have evaluated the quality degradation of the Common solution in comparison to the optimal scheme of protection, which uses a finite number of channel codes. Additionally, we propose a protection solution tailored to H.263/MPEG-4 video coding with an average PSNR improvement of about 0.2 dB relatively to the above mentioned Common solution.

关键词： wireless video video common protection joint source-channel coding MPEG-4 H.263

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Remote source coding Under Gaussian Noise: Dueling Roles of Power and Entropy Power

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IEEE TRANSACTIONS ON INFORMATION THEORY 2019年第7期65卷 4486-4498页

作者： Eswaran, Krishnan Gastpar, Michael Univ Calif Berkeley Dept Elect Engn & Comp Sci Berkeley CA 94720 USA Google Inc Hlth Res Team Mountain View CA 94043 USA Ecole Polytech Fed Lausanne Sch Comp & Commun Sci CH-1015 Lausanne Switzerland

The distributed remote source coding (the so-called CEO) problem is studied in the case where the underlying source, not necessarily Gaussian, has finite differential entropy and the observation noise is Gaussian. The main result is a new lower bound for the sum-rate-distortion function under arbitrary distortion measures. When specialized to the case of mean-squared error, it is shown that the bound exactly mirrors a corresponding upper bound, except that the upper bound has the source power (variance), whereas the lower bound has the source entropy power. Bounds exhibiting this pleasing duality of power and entropy power have been well known for direct and centralized source coding since Shannon's work. While the bounds hold generally, their value is most pronounced when interpreted as a function of the number of agents in the CEO problem.

关键词： source coding CEO problem entropy power entropy power inequality source-channel separation theorem joint source-channel coding rate loss

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Successive Segmentation-Based coding for Broadcasting Over Erasure channels

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IEEE TRANSACTIONS ON INFORMATION THEORY 2016年第6期62卷 3026-3038页

作者： Tan, Louis Li, Yao Khisti, Ashish Soljanin, Emina Univ Toronto Dept Elect & Comp Engn Toronto ON M5S 3G4 Canada Akamai Technol Inc Santa Clara CA 95054 USA Rutgers State Univ Dept Elect & Comp Engn Piscataway NJ 08854 USA

Motivated by error correction coding in multimedia applications, we study the problem of broadcasting a single common source to multiple receivers over heterogeneous erasure channels. Each receiver is required to partially reconstruct the source sequence by decoding a certain fraction of the source symbols. We propose a coding scheme that requires only off-the-shelf erasure codes and can be easily adapted as users join and leave the network. Our scheme involves splitting the source sequence into multiple segments and applying a systematic erasure code to each such segment. We formulate the problem of minimizing the transmission latency at the server as a linear programming problem and explicitly characterize an optimal choice for the code rates and segment sizes. Through numerical comparisons, we demonstrate that our proposed scheme outperforms both separation-based coding schemes and degree-optimized rateless codes and performs close to a natural outer (lower) bound in certain cases. We further study individual user decoding delays for various orderings of segments in our scheme. We provide closed-form expressions for each individual user's excess latency when parity checks are successively transmitted in both increasing order and decreasing order of their segment's coded rate and also qualitatively discuss the merits of each order.

关键词： Application-layer error correction coding broadcast channels joint source-channel coding linear programming multimedia broadcast/multicast services (MBMS) rateless codes unequal error protection

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An Extension to source-channel coding of Correlated Gaussian sources for a Fading GMAC Using TCVQ 17

An Extension to Source-Channel Coding of Correlated Gaussian...

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17th Canadian Workshop on Information Theory (CWIT)

作者： Yahampath, Pradeepa Univ Manitoba Dept Elect & Comp Engn Winnipeg MB Canada

ISBN: (纸本)9781665499088

Separate source-channel (SSC) coding is known to be sub-optimal for communicating correlated Gaussian sources over fading Gaussian multiple-access channel (GMAC). Considering the two-to-one GMAC with Rayleigh block fading and no transmitter-side channel-state information (CSI), a recent work demonstrated a simple fixed-rate joint source-channel (JSC) coding scheme referred to as source-channel trellis coded vector quantization (SC-TCVQ). This paper presents a new extension to SC-TCVQ which is shown to further improve performance with only a minor increase in encoder complexity. New results are presented which show that this finite block-length JSC coding scheme can beat the asymptotic performance upper bound of SSC coding.

关键词： Multiple-access channel Rayleigh fading joint source-channel coding trellis coded quantization uncoded transmission

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Efficient coding for Computation Over Gaussian Multiple-Access channel With Noiseless/Noisy Feedback

Efficient Coding for Computation Over Gaussian Multiple-Acce...

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2024 Information Theory Workshop

作者： Yang, Yuhan Deng, Han Xu, Peng Dai, Bin Southwest Jiaotong Univ SWJTU Sch Informat Sci & Technol Chengdu 610031 Peoples R China Chongqing Key Lab Mobile Commun Technol Chongqing 400065 Peoples R China SWJTU Prov Key Lab Informat Coding & Transmiss Chengdu 611756 Peoples R China Chongqing Univ Posts & Telecommun Sch Commun & Informat Engn Chongqing 400065 Peoples R China

ISBN: (纸本)9798350348941;9798350348934

Reliably reconstructing a function of independent Gaussian sources over a white Gaussian multiple-access channel (GMAC) is reconsidered by exploring channel feedback. First, an efficient linear feedback scheme is proposed to compute arbitrary linear functions of sources over GMAC in the presence of noiseless feedback, which is based on a variation of the well-known Schalkwijk-Kailath type scheme. Next, we extend our proposed scheme to the noisy feedback case (the feedback channel is a white Gaussian channel) by introducing modulo lattice function and dither signal into the original scheme. Finally, the results of this paper are further explained by numerical examples, and it is shown that our proposed schemes outperform the existing ones in some cases.

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

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Relaying via Hybrid coding

Relaying via Hybrid Coding

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IEEE International Symposium on Information Theory (ISIT)

作者： Kim, Young-Han Lim, Sung Hoon Minero, Paolo Univ Calif San Diego Dept ECE La Jolla CA 92093 USA Korea Adv Inst Sci & Technol Dept EE Daejeon South Korea Notre Dame Univ Dept EE Fremantle WA 6959 Australia

ISBN: (纸本)9781457705953

Motivated by the recently developed hybrid coding scheme for joint source-channel coding, this paper proposes a new coding scheme for noisy relay networks. The proposed coding scheme operates in a similar manner to the noisy network coding scheme, except that each relay node uses the hybrid coding interface to transmit a symbol-by-symbol function of the received sequence and its quantized version. This coding scheme unifies both amplify-forward and noisy network coding and can strictly outperform both. The potential of the hybrid coding interface for relaying is demonstrated through the diamond relay network and two-way relay channel examples.

关键词： channel coding Decoding Diamond-like carbon Network coding Noise measurement Relays amplify and forward communication amplify-forward network coding channel coding hybrid coding interface scheme joint source-channel coding network coding noisy relay network coding scheme relays source coding symbol-by-symbol function transmission two-way relay channel

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Hybrid digital-analog coding of memoryless Gaussian sources over AWGN channels with bandwidth compression

Hybrid digital-analog coding of memoryless Gaussian sources ...

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23rd Biennial Symposium on Communications

作者： Wang, Yadong Alajaji, Fady Linder, Tamas Queens Univ Dept Math & Stat Kingston ON K7L 3N6 Canada

ISBN: (纸本)9780780395275

We present a low-complexity and low-delay joint source-channel coding method for bandwidth compression using a hybrid digital-analog (HDA) coding/modulation system based on the recent work in [3]. Analytical optimal distortion expressions (under both matched and mismatched channel conditions) are obtained for the proposed RDA system with a linear analog part for a memoryless Gaussian source and additive white Gaussian noise (AWGN) channel under the mean squared error distortion measure. We consider two HDA coding schemes, both of which employ a vector quantizer cascaded with binary phase-shift keying (BPSK) modulation in the digital part, but differ in that they use linear (resp. non-linear) coding with pulse amplitude modulation (PAM) in the analog part. We derive an optimal power allocation scheme for the system with linear analog coding and present performance comparisons with purely analog and purely digital systems, as well as the scheme in [3]. Simulation results show that, under linear analog coding, the proposed scheme outperforms the scheme of [3] for medium to high channel signal-to-noise ratios (CSNRs). Furthermore, the performance of the HDA scheme with the linear analog part is within 1 dB of the optimal distortion bound for the mismatched HDA system for high CSNRs;for the scheme with non-linear analog coding, the performance can be improved at high CSNRs.

关键词： hybrid digital-analog coding joint source-channel coding vector quantization broadcasting robustness

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joint Transmission and coding Scheme for High-Resolution Video Streams over Multiuser MIMO-OFDM Systems

Joint Transmission and Coding Scheme for High-Resolution Vid...

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10th Anniversary International Workshop on Smart Info-Media Systems in Asia (SISA)

作者： Tashiro, Koji Lanante, Leonardo Kurosaki, Masayuki Ochi, Hiroshi Kyushu Inst Technol Grad Sch Comp Sci & Syst Engn Iizuka Fukuoka 8208502 Japan

High-resolution image and video communication in home networks is highly expected to proliferate with the spread of Wi-Fi devices and the introduction of multiple-input multiple-output (MIMO) systems. This paper proposes a joint transmission and coding scheme for broadcasting high-resolution video streams over multiuser MIMO systems with an eigenbeam-space division multiplexing (E-SDM) technique. Scalable video coding makes it possible to produce the code stream comprised of multiple layers having unequal contribution to image quality. The proposed scheme jointly assigns the data of scalable code streams to subcarriers and spatial streams based on their signal-to-noise ratio (SNR) values in order to transmit visually important data with high reliability. Simulation results show that the proposed scheme surpasses the conventional unequal power allocation (UPA) approach in terms of both peak signal-to-noise ratio (PSNR) of received images and correct decoding probability. PSNR performance of the proposed scheme exceeds 35 dB with the probability of over 95% when received SNR is higher than 6 dB. The improvement in average PSNR by the proposed scheme compared to the conventional UPA comes up to approx. 20 dB at received SNR of 6 dB. Furthermore, correct decoding probability reaches 95% when received SNR is greater than 4 dB.

关键词： multiuser MIMO E-SDM scalable video coding joint source-channel coding unequal power allocation unequal error protection

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A common channel adaptation approach for video coding

A common channel adaptation approach for video coding

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Conference on Image and Video Communications and Processing

作者： Tavares, J Navarro, A Univ Aveiro Inst Telecommun Elect & Telecommun Dept P-3810193 Aveiro Portugal

ISBN: (纸本)0819448222

Wireless access to encoded video requires sophisticated error-resilient mechanisms. Although some video coding standards describe error resilience algorithms, they are inefficient at deep fading wireless and mobile channels. In this paper, we present a novel scheme of error protection for narrowband wireless channels which is independent of any video coding standard. Being, however, this scheme common to all standards, it provides some acceptable video quality degradation. We have evaluated the quality degradation of the Common solution in comparison to the optimal scheme of protection corresponding to the existence of a finite number of channel codes. Besides, we also present the quality degradation for both video coding standards, H.263 and MPEG-4, obtained from a finite number of codes in comparison with the ideal scheme corresponding to the existence of an infinite number of channel codes. Additionally, we proposed a protection solution tailored to H.263/MPEG-4 source coding with an average PSNR improvement of about 0.2 dB relatively to the above mentioned Common solution. Thus, in the framework of joint source-channel coding, we present an adaptive scheme of protection according to the channel bit error rate (BER) and with an overall transmission rate of 64 kbps. In our investigation, we used four QCIF video test sequences and rate compatible punctured convolutional (RCPC) codes. For instance, a PSNR gain of about 16.7 dB is obtained at BER= 10(-2) for "Foreman" video sequence, encoded either by H.263 or by MPEG-4 and protected using the Common scheme in comparison to the unprotected case.

关键词： wireless video video common protection joint source-channel coding MPEG-4 H.263

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Task-Oriented source-channel coding Enabled Autonomous Driving Based on Edge Computing

Task-Oriented Source-Channel Coding Enabled Autonomous Drivi...

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IEEE Conference on Computer Communications (IEEE INFOCOM)

作者： Diao, Yufeng Meng, Zhen Xu, Xiangmin She, Changyang Zhao, Philip G. Univ Glasgow Sch Engn Glasgow Lanark Scotland Univ Sydney Sch Elect & Informat Engn Sydney NSW Australia Univ Manchester Dept Comp Sci Manchester Lancs England

ISBN: (纸本)9798350384482;9798350384475

The communication system is under a paradigm transformation that shifts from traditional bit-level transmission to semantic-level transmission. This transition lays the foundation for complex autonomous driving, necessitating instantaneous processing of substantial data within the constraints of computing capacity and communication bandwidth. In this paper, we propose a novel Task-oriented source-channel coding (TSCC) framework that jointly optimizes source coding and channel coding in a task-oriented manner. Specifically, to reduce communication overhead and guarantee autonomous driving performance, we leverage an autonomous driving agent to guide source-channel coding based on a modified Conditional Variational Autoencoder (CVAE). We test the proposed framework on a well-known autonomous driving platform with different communication channel conditions. The results show that compared to traditional communication and state-of-the-art deep joint source-channel coding (JSCC), our proposed framework achieves superior performance by saving 98.36% communication overhead and maintains an 83.24% driving score even at 0 dB Signal-to-Noise Ratios (SNR).

关键词： joint source-channel coding AI-driven communication autonomous driving edge computing

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