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IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Erdozain, Aitor Crespo, Pedro M. Beferull, Baltasar Univ Navarra CEIT Donostia San Sebastian 20009 Spain Univ Valencia Inst Robot & Technol Informat & Commun Valencia 46980 Spain

ISBN: (纸本)9781457705397

We propose a low complexity analog joint source channel coding Multiple Description (MD) scheme for transmitting the symbols of a Gaussian source across a pair of independent AWGN channels. The outputs of these channels have each a separated receiver, whereas a third receiver has both outputs available. At the transmitter side, a pair of bandwidth-reduction analog mappings are used for joint source-channel coding. The presented scheme has the inherent advantage over digital MD schemes based on separation, that coding and decoding can be performed by using a single-letter (or symbol), a strategy that is very suitable for applications where latency originated by the digital compression and the error correcting coding can not be tolerated. Our scheme achieves a performance that is competitive as compared to the optimal region while having a very low complexity and delay.

关键词： Multiple Description joint source-channel coding

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Secret-Key Generation Using Correlated sources and channels

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IEEE TRANSACTIONS ON INFORMATION THEORY 2012年第2期58卷 652-670页

作者： Khisti, Ashish Diggavi, Suhas N. Wornell, Gregory W. Univ Toronto Dept Elect & Comp Engn Toronto ON M5S 3G4 Canada Univ Calif Los Angeles Dept Elect Engn Los Angeles CA 90095 USA MIT Dept Elect Engn & Comp Sci Cambridge MA 02139 USA

We study the secret-key capacity in a joint source-channel coding setup-the terminals are connected over a discrete memoryless channel and have access to side information, modelled as a pair of discrete memoryless source sequences. As our main result, we establish the upper and lower bounds on the secret-key capacity. In the lower bound expression, the equivocation terms of the source and channel components are functionally additive even though the coding scheme generates a single secret-key by jointly taking into account the source and channel equivocations. Our bounds coincide, thus establishing the capacity, when the underlying wiretap channel can be decomposed into a set of independent, parallel, and reversely degraded channels. For the case of parallel Gaussian channels and jointly Gaussian sources we show that Gaussian codebooks achieve the secret-key capacity. In addition, when the eavesdropper also observes a correlated side information sequence, we establish the secret-key capacity when both the source and channel of the eavesdropper are a degraded version of the legitimate receiver. We finally also treat the case when a public discussion channel is available, propose a separation based coding scheme, and establish its optimality when the channel output symbols of the legitimate receiver and eavesdropper are conditionally independent given the input.

关键词： Information theoretic security joint source-channel coding public discussion secret-key agreement wiretap channel

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Multi-path content delivery: Efficiency analysis and optimization algorithms

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JOURNAL OF VISUAL COMMUNICATION AND IMAGE REPRESENTATION 2012年第8期23卷 1189-1198页

作者： Chakareski, Jacob Ecole Polytech Fed Lausanne Signal Proc Lab LTS4 CH-1015 Lausanne Switzerland

The paper studies the benefits of multi-path content delivery from a rate-distortion efficiency perspective. We develop an optimization framework for computing transmission schedules for streaming media packets over multiple network paths that maximize the end-to-end video quality, for the given bandwidth resources. We comprehensively address the two prospective scenarios of content delivery with packet path diversity. In the context of sender-driven systems, our framework enables the sender to compute at every transmission instance the mapping of packets to network paths that meets a rate constraint while minimizing the end-to-end distortion. In receiver-driven multi-path streaming, our framework enables the client to dynamically decide which packets, if any, to request for transmission and from which media servers, such that the end-to-end distortion is minimized for a given transmission rate constraint. Via simulation experiments, we carefully examine the performance of the scheduling framework in both multi-path delivery scenarios. We demonstrate that the optimization framework closely approaches the performance of an ideal streaming system working at channel capacity with an infinite play-out delay. We also show that the optimization leads to substantial gains in rate-distortion performance over a conventional content-agnostic scheduler. Through the concept of error-cost performance for streaming a single packet, we provide another useful insight into the operation of the optimization framework and the conventional scheduling system. (c) 2012 Elsevier Inc. All rights reserved.

关键词： Video streaming Multi-path delivery Rate-distortion optimization Packet scheduling Rate allocation Server diversity joint source-channel coding Markov decision processes

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joint resource allocation for MIMO-OFDM video transmission systems with unequal error protection

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Journal of Harbin Institute of Technology(New Series) 2012年第2期19卷 119-124页

作者：张成文刘鑫谭学治 Communication Research Center Harbin Institute of Technology

To improve the performance of MIMO-OFDM video transmission systems on the limitation of wireless bandwidth and transmitting power,we propose an adaptive joint resource allocation algorithm with unequal error protection(UEP) based on joint source-channel coding(JSCC) according to H.264 video compression standard and RCPT channel *** to different thresholds of the average SNR of subchannels,the algorithm dynamically allocates the source coding parameters of original video data and the channel coding parameters of RCPT,which realizes UEP for the compressed video data of different *** the bit and power allocation based on MQAM modulation and the subspace allocation based on beamforming technology for different subcarriers,an adaptive joint resource allocation making full use of space-frequency domain resources have been *** simulation results indicate that the algorithm improves the adaptability of video transmission systems in different wireless environments and the quality of video retrieval.

关键词： video transmission MIMO-OFDM unequal error protection joint source-channel coding

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Compressed-and-Forward: Compressive Sensing for Cooperative Communication

Compressed-and-Forward: Compressive Sensing for Cooperative ...

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IEEE International Symposium on Intelligent Signal Processing and Communications Systems (ISPACS)

作者： Yeh, Chia-Hung Lin, Yu-Liang Liu, Cheng-Chih Huang, Wan-Jen Natl Sun Yat Sen Univ Dept Elect Engn Kaohsiung Taiwan Natl Sun Yat Sen Univ Inst Communicat Engn Kaohsiung Taiwan

ISBN: (纸本)9781467350839;9781467350815

Cooperative communication has been shown that it is an effective way to achieve spatial diversity in order to combat the user-outage caused by effects fading channel. Except for amplify-and-forward (AF) and decode-and-forward (DF), compressed-and-forward (CF) is also an efficient forwarding strategy. In the existing CF protocol, the relay will switch to the DF mode when the source transmitted signal can be recovered by the relay completely;however, no further compression is made in this scheme. This paper proposes a new CF scheme. The relay will estimate if the codeword in a predefined block can be succeeded decoded, then choose the corresponding forwarding methods which are based on joint source-channel coding or compressive sensing. At the decode side, a joint decoder is designed to decode the source according to the relay compression mode. Simulation results show that the proposed CF scheme can acquire the spatial diversity and outperform AF and DF schemes.

关键词： cooperative communication compressed-and-forward joint source-channel coding compressive sensing

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

PACKET LOSS PROTECTION FOR INTERACTIVE AUDIO OBJECT RENDERIN...

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4th International Workshop on Quality of Multimedia Experience (QoMEX)

作者： Zheng, Xiguang Ritz, Christian Univ Wollongong Sch Elect Comp & Telecommun Engn ICT Res Inst Wollongong NSW 2522 Australia

ISBN: (纸本)9781467307253

This paper presents a new framework for compression and transmission of simultaneously occurring audio objects through packet loss channels in order to maintain user Quality of Experience (QoE). The audio objects are compressed into two mono mixtures, by exploiting sparsity of multichannel audio signals to identify the two most dominant time-frequency components in terms of an energy measure. These mixtures are further compressed using the MP3 audio codec, with the optimised transmission model selected from several channel coding models based on the Forward Error Correction (FEC) and Multiple Description coding (MDC) packet loss protection techniques. Audio objects can be recovered robustly from any received description(s) allowing real-time selective reproduction at the listeners' end. Results from spectral distortion measurements indicate the proposed scheme maintains the perceptual quality of the audio objects across a wide variety of packet loss conditions.

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

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Phase Asynchronous Cognitive Interference channels: Lossless source-channel Separation Theorems

Phase Asynchronous Cognitive Interference Channels: Lossless...

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IEEE Global Communications Conference (GLOBECOM)

作者： Saffar, Hamidreza Ebrahimzadeh Mitran, Patrick Univ Waterloo Dept Elect & Comp Engn Waterloo ON N2L 3G1 Canada

ISBN: (纸本)9781467309219;9781467309202

Sufficient and necessary conditions for reliable lossless communication of two correlated sources over cIasses of phase asynchronous cognitive interference channels are derived. Namely, we consider interference channels in which one of the encoders, i.e., the secondary or cognitive user, is causally or non-causally aware of the other's message. Moreover, as a practical constraint, we assume the transmitters are not aware of the phase shirts introduced by channels. We show that, for both cIasses of causal and noncausal cooperation, under strong interference conditions, separate source and channel coding is optimal for reliable communication of both users. Also, we derive necessary and sufficient conditions for reliable communication of the cognitive radio transmission while the primary is able to maintain the same information rate it could reliably send in the absence of the secondary. To the best of our knowledge, this is the first work to find fundamental limits of lossless reliable communication for cognitive interference channels.

关键词： joint source-channel coding cognitive interference channel phase uncertainty correlated sources unidirectional cooperation

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To code or not to code: Revisited

To code or not to code: Revisited

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IEEE Information Theory Workshop (ITW)

作者： Kostina, Victoria Verdu, Sergio Princeton Univ Dept Elect Engn Princeton NJ 08544 USA

ISBN: (纸本)9781467302234;9781467302241

We revisit the dilemma of whether one should or should not code when operating under delay constraints. In those curious cases when the source and the channel are probabilistically matched so that symbol-by-symbol coding is optimal in terms of the average distortion achieved, we show that it also achieves the dispersion of joint source-channel coding. Moreover, even in the absence of such probabilistic matching between the source and the channel, symbol-by-symbol transmission, though asymptotically suboptimal, might outperform not only separate source-channel coding but also the best known random-coding joint source-channel coding achievability bound in the finite blocklength regime.

关键词： Achievability converse finite blocklength regime joint source-channel coding lossy source coding memoryless sources rate-distortion theory Shannon theory

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BANDWIDTH-REDUCTION ANALOG MAPPINGS FOR AWGN channelS WITH SIDE INFORMATION

BANDWIDTH-REDUCTION ANALOG MAPPINGS FOR AWGN CHANNELS WITH S...

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20th European Signal Processing Conference (EUSIPCO)

作者： Alustiza, Iker Erdozain, Aitor Crespo, Pedro Beferull-Lozano, Baltasar Un Navarra Tecnun Manuel de Lardizabal 15 San Sebastian 20018 Spain Univ Valencia Inst Robot Technol Informt & las Comun Valencia 46980 Spain

ISBN: (纸本)9781467310680

Recently, the joint source-channel coding schemes based on analog mappings have gained prominence. Their simplicity and low delay compared to other coding strategies make them more suitable for real-time applications. In this work, we propose a novel joint source-channel coding scheme, based also on analog mappings, for a point-to-point communication channel with side information at the receiver (also known as Wyner-Ziv scenario).

关键词： joint source-channel coding Wyner-Ziv scenario analog mappings

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Lossy source-channel Communication over a Phase-Incoherent Interference Relay channel 2012

Lossy Source-Channel Communication over a Phase-Incoherent I...

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IEEE International Symposium on Information Theory

作者： Saffar, H. Ebrahimzadeh Khuzani, M. Badiei Mitran, P. Univ Waterloo Waterloo ON N2L 3G1 Canada

ISBN: (纸本)9781467325790

We study the lossy communication of a bivariate Gaussian source over an interference channel with the presence of a helping relay. We assume that the wireless links introduce random phase shifts which are unknown to the transmitters (including the relay) and call the channel a phase incoherent interference relay channel (PI-IRC). We derive inner and outer bounds for the achievable distortion region, where the inner bound is derived under specific strong interference conditions as well as strong gain conditions between transmitters and the relay. When the sources are correlated, we find an approximate achievable distortion region in the high SNR regime. In case of independent sources, the bounds are tight and by explicitly providing the achievable distortion region, we show that a separation theorem results for the PI-IRC under strong interference conditions. By removing the relay, the result also specializes to an interference channel.

关键词： joint source-channel coding distortion region interference channel interference relay channel phase uncertainty correlated sources

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