检索结果-内蒙古大学图书馆

Secure Transmission of sources Over Noisy channels With Side Information at the Receivers

IEEE TRANSACTIONS ON INFORMATION THEORY 2014年第1期60卷 713-739页

作者： Villard, Joffrey Piantanida, Pablo Shamai (Shitz), Shlomo Supelec Dept Telecommun F-91192 Gif Sur Yvette France Technion Israel Inst Technol Dept Elect Engn IL-32000 Haifa Israel

This paper investigates the problem of source-channel coding for secure transmission with arbitrarily correlated side informations at both receivers. This scenario consists of an encoder (referred to as Alice) that wishes to compress a source and send it through a noisy channel to a legitimate receiver (referred to as Bob). In this context, Alice must simultaneously satisfy the desired requirements on the distortion level at Bob and the equivocation rate at the eavesdropper (referred to as Eve). This setting can be seen as a generalization of the problems of secure source coding with (uncoded) side information at the decoders and the wiretap channel. A general outer bound on the rate-distortion-equivocation region, as well as an inner bound based on a pure digital scheme, is derived for arbitrary channels and side informations. In some special cases of interest, it is proved that this digital scheme is optimal and that separation holds. However, it is also shown through a simple counter-example with a binary source that a pure analog scheme can outperform the digital one while being optimal. According to these observations and assuming matched bandwidth, a novel hybrid digital/analog scheme that aims to gather the advantages of both digital and analog ones is then presented. In the quadratic Gaussian setup when side information is only present at the eavesdropper, this strategy is proved to be optimal. Furthermore, it outperforms both digital and analog schemes and cannot be achieved via time-sharing. Through an appropriate coding, the presence of any statistical difference among the side informations, the channel noises, and the distortion at Bob can be fully exploited in terms of secrecy.

关键词： combined source-channel coding Gaussian channels information security rate-distortion side information

来源：评论

学校读者我要写书评

暂无评论

Broadcasting Correlated Gaussians

引用

IEEE TRANSACTIONS ON INFORMATION THEORY 2010年第7期56卷 3057-3068页

作者： Bross, Shraga I. Lapidoth, Amos Tinguely, Stephan Bar Ilan Univ Sch Engn IL-52900 Ramat Gan Israel ETH Dept Informat Technol & Elect Engn CH-8092 Zurich Switzerland

We study the transmission of a memoryless bivariate Gaussian source over an average-power-constrained one-to-two Gaussian broadcast channel. The transmitter observes the source and describes it to the two receivers by means of an average-power-constrained signal. Each receiver observes the transmitted signal corrupted by a different additive white Gaussian noise and wishes to estimate the source component intended for it: Receiver 1 wishes to estimate the first source component and Receiver 2 wishes to estimate the second. Our interest is in the pairs of expected squared-error distortions that are simultaneously achievable at the two receivers. We prove that an uncoded transmission scheme that sends a linear combination of the source components achieves the optimal power-versus-distortion trade-off whenever the signal-to-noise ratio is below a certain threshold. The threshold is a function of the source correlation and the distortion at the receiver with the weaker noise.

关键词： Broadcast channel combined source-channel coding correlated sources Gaussian broadcast channel Gaussian sources lossy compression mean squared-error distortion uncoded transmission

来源：评论

学校读者我要写书评

暂无评论

Unequal error protection and source-channel decoding of CELP speech

引用

ELECTRONICS LETTERS 2002年第7期38卷 347-349页

作者： Nazer, A Alajaji, F Queens Univ Dept Math & Stat Kingston ON K7L 3N6 Canada

The reliable communication of FS CELP 10 16 encoded speech over very noisy channels is investigated. Using second-order Markov chains it is shown that over one-quarter of the CELP bits in every frame of speech are redundant. An unequal error protection coding scheme, which exploits this residual redundancy, is proposed for sending the CELP parameters over Gaussian and Rayleigh fading channels. Simulations indicate substantial coding gains over conventional systems.

关键词： speech coding Gaussian channels combined source-channel coding reliable communication coding gains error correction codes voice communication decoding CELP speech second-order Markov chains linear predictive coding source-channel decoding Rayleigh channels telecommunication network reliability Markov processes unequal error protection coding FS CELP 1016 encoded speech redundancy residual redundancy very noisy channels Speech and audio coding Rayleigh fading channels

来源：评论

学校读者我要写书评

暂无评论

Soft-Decision COVQ for Rayleigh-Fading channels

引用

IEEE COMMUNICATIONS LETTERS 1998年第6期2卷 162-164页

作者： Alajaji, Fady I. Phamdo, Nam C. Queens Univ Dept Math & Stat Kingston ON K7L 3N6 Canada Queens Univ Dept Elect & Comp Engn Kingston ON K7L 3N6 Canada SUNY Stony Brook Dept Elect Engn Stony Brook NY 11794 USA

A channel-optimized vector quantizer (COVQ) scheme that exploits the channel soft-decision information is proposed. The scheme is designed for stationary memoryless Gaussian and Gauss-Markov sources transmitted over BPSK-modulated Rayleigh-fading channels. It is demonstrated that substantial coding gains (2-3 dB in channel signal-to-noise ratio (SNR) and 1-1.5 dB in source signal-to-distortion ratio (SDR) can be achieved over COVQ systems designed for discrete (hard-decision demodulated) channels.

关键词： combined source-channel coding COVQ soft-decision decoding Rayleigh-fading channels

来源：评论

学校读者我要写书评

暂无评论

Variable-length error-correcting codes

引用

IEE PROCEEDINGS-COMMUNICATIONS 2000年第4期147卷 211-215页

作者： Buttigieg, V Farrell, PG Univ Malta Dept Commun & Comp Engn Msida Malta Univ Lancaster Fac Sci Appl Commun Res Ctr Lancaster LA1 4YR England

Variable-length error-correcting codes, suitable to perform joint source-channel coding, are presented. A maximum likelihood decoding algorithm for these codes is given. Some performance bounds are derived and it is shown that these codes are similar to convolutional codes. The free distance of these codes is defined and it is shown that it is the most important parameter that determines their performance at high E-b/N-o. It is shown that the performance of these codes can be better than a standard cascade of a Huffman code followed by a BCH code with the same code parameters.

关键词： Viterbi decoding variable length codes maximum likelihood decoding joint source-channel coding performance bounds free distance Codes variable-length error-correcting codes error correction codes combined source-channel coding maximum likelihood decoding algorithm modified Viterbi decoding

来源：评论

学校读者我要写书评

暂无评论

Cross-layer source-channel control for future wireless multimedia services: energy, latency, and quality investigation

引用

IET COMMUNICATIONS 2017年第17期11卷 2575-2584页

作者： Wang, Qin Wang, Wei Jin, Shi Zhu, Hongbo New York Inst Technol Nanjing Sch Engn & Comp Sci Nanjing Jiangsu Peoples R China San Diego State Univ Dept Comp Sci San Diego CA 92182 USA Southeast Univ Natl Mobile Commun Res Lab Nanjing Jiangsu Peoples R China Nanjing Univ Posts & Telecommun Jiangsu Key Lab Wireless Commun Nanjing Jiangsu Peoples R China

Efficient use of available energy resources for real-time multimedia communication with a quality guarantee is one of the main challenges for future mobile computing systems. To meet the high quality-of-experience (QoE) demand of multimedia services, we propose a novel quality-driven joint source-channel coding (JSCC) scheme with an unequal error protection (UEP) technique that allocates bits by optimising source intra refreshing rates and channel correction coding rates. The key contribution of this work is that the frame importance diversity at the application layer is jointly considered with the error correction techniques and resource constraints at lower layers. For any given bit budget, the JSCC model is capable of allocating adaptive bits between source coding and channel coding among media streams. The source-aware UEP scheme is capable of dynamically allocating the error correction bits among frames, achieving the maximum overall QoE. Simulation results demonstrated that significant improvement in multimedia quality and remarkable energy/time conservation can be achieved by deploying the proposed group-based JSCC strategy, although the complexity is limited.

关键词： combined source-channel coding error correction codes multimedia communication quality of experience

来源：评论

学校读者我要写书评

暂无评论

Linear feedback communication systems with markov sources: Optimal system design and performance evaluation

引用

IEEE TRANSACTIONS ON INFORMATION THEORY 1995年第6期41卷 1868-1876页

作者： Baccarelli, E Cusani, R Univ of Rome `La Sapienza' Rome Italy

The optimal analog discrete-time feedback communication system is designed for the transmission of a Markov process, such as that generated by a combined source/channel encoder, The forward channel is affected by an additive white Gaussian noise, while the feedback channel is causal and noiseless;no repetition of the transmitted sample is assumed, On the basis of the Minimum Mean Square Error (MMSE) criterion, the optimal transmitter and receiver are derived under the constraint of a maximum power level for the transmission over the forward channel, The resulting optimized system is adaptive and fully exploits the available power, thus maximizing the information rate transferred by the system itself, For comparison purposes, the optimal MMSE communication system without feedback link is also designed, The MSE performance of both systems, with and without feedback link, is evaluated by means of closed-form expressions and their convergence rate to the steady state is also computed, Using the feedback link gives significant performance improvements when the input-encoded process is moderately or highly correlated;in this case, the advantages offered by the combined source-channel coding techniques are fully exploited by the proposed optimized feedback communication systems.

关键词： feedback communication system adaptive channel modulation combined source-channel coding

来源：评论

学校读者我要写书评

暂无评论

Transmission of Analog Information Over the Multiple Access Relay channel Using Zero-Delay Non-Linear Mappings

引用

IEEE ACCESS 2019年 7卷 48405-48416页

作者： Fresnedo, Oscar Suarez-Casal, Pedro Castedo, Luis Univ A Coruna Dept Comp Engn La Coruna 15071 Spain

We consider the zero-delay encoding of discrete-time analog information over the Multiple Access Relay channel (MARC) using non-linear mapping functions. On the one hand, zero-delay nonlinear mappings are capable to deal with the multiple access interference (MAI) caused by the simultaneous transmission of the information. On the other, the relaying operation is a Decode-and-Forward (DF) strategy where the decoded messages are merged into a single message using a specific continuous mapping depending on the correlation level of the source information. At the receiver, an approximated Minimum Mean Squared Error (MMSE) decoder is developed to obtain an estimate of the transmitted source symbols which exploits the information received from the relay node in combination with the messages received from the transmitters through the direct links. The resulting system provides better performance than the other alternative encoding strategies for the MARC with similar complexity and delay and also approaches the performance of theoretical strategies which require a significantly higher delay and computational cost.

关键词： combined source-channel coding relay networks multiuser channels network coding

来源：评论

学校读者我要写书评

暂无评论

Index assignment-based channel coding

引用

IET COMMUNICATIONS 2012年第2期6卷 172-178页

作者： Oztoprak, H. Villette, S. Kondoz, A. Univ Surrey Ctr Vis Speech & Signal Proc Guildford GU2 7XH Surrey England

A scheme named index assignment-based channel coding (IACC) has been developed for resilience of speech/audio codecs against the bit errors commonly experienced in wireless channels. Although IACC is a type of joint source channel coding, it does not intervene with the source codec design. The proposed scheme takes into account source characteristics and adjusts the amount of coding according to the sensitivity of different values of the source parameters. It is shown that source characteristics play an important role in the performance of IACC. The performance of IACC has been evaluated by applying it to parameters generated by adaptive multi-rate wideband (AMR-WB+) audio codec. A method for perceptual training of IACC codes is also proposed. The results demonstrate that the performance of IACC and IACC concatenated with convolutional coding can be superior to that of conventional convolutional coding at high and moderate bit error rates, respectively.

关键词： combined source-channel coding convolutional codes error statistics source codec design wireless channels concatenated coding adaptive multirate wideband audio codec index assignment-based channel coding speech coding bit error rates Speech and audio coding audio coding adaptive codes concatenated codes speech codecs joint source channel coding Speech processing techniques BER Radio links and equipment convolutional coding Other topics in statistics

来源：评论

学校读者我要写书评

暂无评论

Iterative source and channel decoding relying on correlation modelling for wireless video transmission

引用

IET COMMUNICATIONS 2013年第14期7卷 1465-1475页

作者： Huo, Yongkai Wang, Tao Maunder, Robert G. Hanzo, Lajos Univ Southampton Sch ECS Southampton SO9 5NH Hants England

Since joint source-channel decoding is capable of exploiting the residual redundancy in the source signals for improving the attainable error resilience, it has attracted substantial attention. In this treatise, the authors study iterative source-channel decoding (ISCD) aided video communications, where the video signal redundancy is modelled by a first-order Markov process. Firstly, the authors derive reduced-complexity formulas for the first-order Markov modelling (FOMM) aided source decoding. Then they propose a bit-based iterative horizontal-vertical scanline model (IHVSM) aided source decoding algorithm, where a horizontal and a vertical source decoder are employed for exchanging their extrinsic information using the iterative decoding philosophy. The iterative IHVSM aided decoder is then employed in a forward error correction (FEC) encoded uncompressed video transmission scenario, where the IHVSM and the FEC decoder exchange softbit-information for performing turbo-like ISCD for the sake of improving the reconstructed video quality. Finally, the authors benchmark the attainable system performance against a near-lossless H.264/AVC video communication system and the existing FOMM-based softbit source decoding scheme. The authors simulation results show that E-b/N-0 improvements in excess of 2.8 dB are attainable by the proposed technique in uncompressed video applications.

关键词： combined source-channel coding data compression forward error correction iterative decoding Markov processes radio receivers video coding video communication correlation modelling wireless video transmission joint source-channel decoding residual redundancy source signals attainable error resilience improvement source redundancy iterative source-channel decoding aided video communications ISCD first-order Markov process reduced-complexity formulas first-order Markov modelling aided source decoding algorithm FOMM bit-based iterative horizontal-vertical scanline model aided source decoding algorithm IHVSM horizontal source decoder vertical source decoder forward error correction encoded uncompressed video transmission scenario FEC decoder reconstructed video quality improvement near-lossless H 264-AVC video communication system FOMM-based softbit source decoding scheme 1D Markov model aided decoder uncompressed video applications gain 2 8 dB

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：