检索结果-内蒙古大学图书馆

source-channel Communication Over Phase-Incoherent Multiuser channels

IEEE TRANSACTIONS ON COMMUNICATIONS 2014年第8期62卷 2996-3003页

作者： Saffar, Hamidreza Ebrahimzadeh Alian, Ehsan Haj Mirza Mitran, Patrick Univ Waterloo Waterloo ON N2L 3G1 Canada

We study the transmission of two correlated and memoryless sources (U-1, U-2) over several multiuser phase asynchronous channels. Namely, we consider a multiple access relay channel (MARC) with causal, and a MARC with non-causal unidirectional cooperation between encoders, referred to as phase-incoherent causal (respectively, non-causal) cognitive MARCs. We also consider phase-incoherent interference channel models with and without relay, in the same context. In all cases, the input signals are assumed to undergo non-ergodic phase shifts, which are unknown to the transmitters and known to the receivers as a realistic assumption. Both necessary and sufficient conditions in order to reliably send the correlated sources to the destinations are derived. In particular, for all of the channel models, by using a key lemma, we first derive an outer bound for reliable communication. Then, using separate source and channel coding and under specific gain conditions, we establish the same region as the inner bound. We thus conclude that without the knowledge of the phase shifts at transmitters, and under specific gain conditions, separation is optimal.

关键词： joint source-channel coding phase uncertainty multiple access relay channel interference channel correlated sources

来源：评论

学校读者我要写书评

暂无评论

Distributed joint source-channel coding for Functions over a Multiple Access channel

Distributed Joint Source-Channel Coding for Functions over a...

引用

IEEE Global Telecommunications Conference (GLOBECOM 09)

作者： Rajesh, R. Sharma, Vinod Indian Inst Sci Dept Elect Commun Engg Bangalore 560012 Karnataka India

ISBN: (纸本)9781424441471

In this paper we provide sufficient conditions for lossy transmission of functions of correlated data over a multiple access channel (MAC). The conditions obtained can be shown as generalized version of Yamamoto's result [28]. We also obtain efficient joint source-channel coding schemes for transmission of discrete and continuous alphabet sources to recover the function values.

关键词： joint source-channel coding Graph coloring Lipschitz functions Correlated sources

来源：评论

学校读者我要写书评

暂无评论

Low-Delay joint source-channel Mappings for the Gaussian MAC

引用

IEEE COMMUNICATIONS LETTERS 2014年第2期18卷 249-252页

作者： Kron, Johannes Alajaji, Fady Skoglund, Mikael Royal Inst Technol KTH Sch Elect Engn Stockholm Sweden Queens Univ Dept Math & Stat Kingston ON K7L 3N6 Canada

The bivariate Gaussian multiterminal source coding problem with transmission over the Gaussian multiple-access channel is studied. We propose the use of low-delay joint source-channel mappings and show how performance saturation, which is unavoidable with linear transmission, can be overcome by optimizing the mappings. The optimized mappings are in general nonlinear and perform a combination of hard and soft decision signaling for the error-resilient transmission of analog data.

关键词： joint source-channel coding low-delay transmission multi-terminal source coding Gaussian multiple-access channel correlated sources mean square error

来源：评论

学校读者我要写书评

暂无评论

joint source-channel Vector Quantization for Compressed Sensing

引用

IEEE TRANSACTIONS ON SIGNAL PROCESSING 2014年第14期62卷 3667-3681页

作者： Shirazinia, Amirpasha Chatterjee, Saikat Skoglund, Mikael KTH Royal Inst Technol Sch Elect Engn Commun Theory Dept S-10044 Stockholm Sweden

We study joint source-channel coding (JSCC) of compressed sensing (CS) measurements using vector quantizer (VQ). We develop a framework for realizing optimum JSCC schemes that enable encoding and transmitting CS measurements of a sparse source over discrete memoryless channels, and decoding the sparse source signal. For this purpose, the optimal design of encoder-decoder pair of a VQ is considered, where the optimality is addressed by minimizing end-to-end mean square error (MSE). We derive a theoretical lower bound on the MSE performance and propose a practical encoder-decoder design through an iterative algorithm. The resulting coding scheme is referred to as channel-optimized VQ for CS, coined COVQ-CS. In order to address the encoding complexity issue of the COVQ-CS, we propose to use a structured quantizer, namely low-complexity multistage VQ (MSVQ). We derive new encoding and decoding conditions for the MSVQ and then propose a practical encoder-decoder design algorithm referred to as channel-optimized MSVQ for CS, coined COMSVQ-CS. Through simulation studies, we compare the proposed schemes vis-a-vis relevant quantizers.

关键词： Vector quantization multi-stage vector quantization joint source-channel coding noisy channel compressed sensing sparsity mean square error

来源：评论

学校读者我要写书评

暂无评论

INFLATING COMPRESSED SAMPLES: A joint source-channel coding APPROACH FOR NOISE-RESISTANT COMPRESSED SENSING

INFLATING COMPRESSED SAMPLES: A JOINT SOURCE-CHANNEL CODING ...

引用

IEEE International Conference on Acoustics, Speech and Signal Processing

作者： HesamMohseni, A. Babaie-Zadeh, M. Jutten, C. Sharif Univ Technol Dept Elect Engn Tehran Iran GIPSA LAB Grenoble France

ISBN: (纸本)9781424423538

Recently, a lot of research has been done on compressed sensing, capturing compressible signals using random linear projections to a space of radically lower dimension than the ambient dimension of the signal. The main impetus of this is that the radically dimension-lowering linear projection step can be done totally in analog hardware, in some cases even in constant time, to avoid the bottleneck in sensing and quantization steps where a large number of samples need to be sensed and quantized in short order, mandating the use of it large number of fast expensive sensors and A/D converters. Reconstruction algorithms from these projections have been found that come within distortion levels comparable to the state of the art in lossy compression algorithms. This paper considers a variation on compressed sensing that makes it resistant to spiky noise. This is achieved by an analog real-field error-correction coding step. It results in a small asymptotic overhead in the number of samples, but makes exact reconstruction under spiky measurement noise, one type of which is the salt and pepper noise in imaging devices, possible. Simulations are per-formed that corroborate our claim and in fact substantially improve reconstruction under unreliable sensing characteristics and are stable even under small perturbations with Gaussian noise.

关键词： Compressed Sensing joint source-channel coding Sparse solution problems Natural Images Error-Correcting codes

来源：评论

学校读者我要写书评

暂无评论

An Improved Iterative Decoding Scheme based on Error-resistant Arithmetic Code

An Improved Iterative Decoding Scheme based on Error-resista...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Lin, Qiuzhen Wong, Kwok-Wo Shenzhen Univ Coll Comp Sci & Software Engn Shenzhen Peoples R China City Univ Hong Kong Dept Elect Engn Hong Kong Peoples R China

ISBN: (纸本)9781479934324

In this paper, an improved soft in soft out (SISO) iterative decoding scheme for joint source-channel coding is presented. It is realized as the iterative soft decoding of arithmetic code based on sequential decoding to successively prune the decoding tree. Making use of the forecasted forbidden symbols, an error-resistant arithmetic code with an improved a posteriori probability (APP) metric is adopted to further enhance the error correction performance. Simulation results have validated the superiority of our scheme in terms of packet error rate for the AWGN channel.

关键词： joint source-channel coding Arithmetic coding Iterative Decoding

来源：评论

学校读者我要写书评

暂无评论

MAP Decoding of Correlated sources over Soft-Decision Orthogonal Multiple Access Fading channels with Memory 80

MAP Decoding of Correlated Sources over Soft-Decision Orthog...

引用

80th IEEE Vehicular Technology Conference (VTC Fall)

作者： Beheshti, Seyed Parsa Alajaji, Fady Linder, Tamas Univ Kingston Dept Elect & Comp Engn Kingston ON K7L 3N6 Canada Queens Univ Dept Math & Stat Kingston ON K7L 3N6 Canada Queens Univ Dept Elect & Comp Engn Kingston ON K7L 3N6 Canada

ISBN: (纸本)9781479944491

We consider the joint source-channel coding (JSCC) problem where the real valued outputs of two correlated memoryless Gaussian sources are scalar quantized, bit assigned, and transmitted, without applying any error correcting code, over a multiple access channel (MAC) which consists of two orthogonal point-to-point time-correlated Rayleigh fading sub-channels with soft-decision demodulation. At the receiver side, a joint sequence maximum a posteriori (MAP) detector is used to exploit the correlation between the two sources as well as the redundancy left in the quantizer's indices, the channel's soft-decision outputs, and noise memory. The MAC's sub-channels are modeled via non-binary Markov noise discrete channels recently shown to effectively represent point-to-point fading channels. For the simple case of quantizing the sources with two levels, we establish a necessary and sufficient condition under which the joint sequence MAP decoder can be reduced to a simple instantaneous symbol-by-symbol decoder. Then, using numerical results obtained by system simulation, it is observed that when the sources are highly correlated and soft-decision quantization is used, JSCC can profit from a high correlation in the channel noise process and provide significant signal-to-distortion ratio improvements of up to 6.3 dB over a fully interleaved channel.

关键词： joint source-channel coding correlated Gaussian sources multiple access channels MAP decoding channels with memory time-correlated fading channels scalar quantization

来源：评论

学校读者我要写书评

暂无评论

PACKET LOSS PROTECTION FOR INTERACTIVE SPEECH OBJECT RENDERING: A MULTIPLE DESCRIPTION APPROACH 2

PACKET LOSS PROTECTION FOR INTERACTIVE SPEECH OBJECT RENDERI...

引用

2nd IEEE China Summit / International Conference on Signal and Information Processing (IEEE ChinaSIP)

作者： Zheng, Xiguang Ritz, Christian Univ Wollongong Sch Elect Comp & Telecommun Engn ICT Res Inst Wollongong NSW 2522 Australia Dolby Labs Beijing Beijing 100021 Peoples R China

ISBN: (纸本)9781479954032

This paper investigates the application of novel packet loss protection schemes to compress mixtures of speech sources for interactive real-time audio services such as spatial teleconferencing. Hybrid Forward Error Correction (FEC) and Multiple Description coding (MDC) packet loss protection techniques are applied to the outputs of a psychoacoustic-based Analysis-By-Synthesis (PABS) coder designed for such applications. The protection approaches split the coder outputs into two descriptions that are separately protected using the hybrid FEC-MDC techniques. Perceptual Evaluation of Speech Quality (PESQ) measurements compare the performance of different protection schemes for a range of typical packet loss conditions. Results indicate the proposed scheme maintains the perceptual quality of the speech sources across a wide variety of packet loss conditions.

关键词： Quality of Experience Speech Compression joint source-channel coding

来源：评论

学校读者我要写书评

暂无评论

A NOVEL ERROR RESILIENT joint source-channel coding SCHEME FOR IMAGE TRANSMISSION OVER ERROR PRONE channelS

A NOVEL ERROR RESILIENT JOINT SOURCE-CHANNEL CODING SCHEME F...

引用

2nd IEEE International Conference on Broadband Network and Multimedia Technology

作者： Xue Guodong Hao Chenxi Zhang Wenbo Zou Jun Beijing Univ Posts & Telecommun Sch Informat & Commun Engn Beijing 100088 Peoples R China Beijing Univ Posts & Telecommun Sch Comp Sci & Technol Beijing 100088 Peoples R China IBM Corp China Software Dev Lab CDL Beijing Peoples R China

ISBN: (纸本)9781424450053

In this paper, we proposed a double-level error resilient joint source-channel coding scheme for image transmission. Characteristically, we inserted one coordinative component named error resilient entropy coding (EREC) between source coding and channel coding to achieve additional error resilient capability. Based on the novel architecture, we proved that, in the aspects of computational complexity, coding redundancy and furthermore the decoding performance of image transmission, our scheme outperformed either separate source and channel coding scheme or joint source-channel coding scheme with synchronization words.

关键词： double-level error resilient capability joint source-channel coding image transmission error prone channels

来源：评论

学校读者我要写书评

暂无评论

Optimal Tradeoff between source and State Distortions over a Gaussian channel Using Single and Hybrid Digital Analog Codes 7

Optimal Tradeoff between Source and State Distortions over a...

引用

7th International Symposium on Telecommunications (IST)

作者： Pezeshkpour, Pouya Behroozi, Hamid Sharif Univ Technol Dept Elect Engn Tehran Iran

ISBN: (纸本)9781479953592

In this paper, the problem of transmitting an analog Gaussian source over an additive white Gaussian noise (AWGN) channel in the presence of a Gaussian interference known only at the transmitter is investigated. Our goal is to estimate both the analog source and the channel state at the receiver simultaneously. In this work, we present different transmission schemes based on joint source-channel coding. We study hybrid digital-analog (HDA) joint source-channel coding schemes and analyze the region of (mean-squared error) distortion pairs (in estimating the source and the state) that are simultaneously achievable.

关键词： AWGN channel Costa coding hybrid digital-analog (HDA) coding joint source-channel coding Wyner-Ziv coding

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

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

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

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

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：