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GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489)

作者： I. Bahceci Y. Altunbasak T.M. Duman School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA Department of Electrical Engineering Arizona State University Tempe AZ USA

We propose a joint source-channel coding scheme for wireless communication systems with multiple transmit and receive antennas. The source coder is realized by a multiple description encoder that generates multiple bit streams for the same source. Each description is then separately turbo coded and transmitted using multiple antennas. For the receiver, we describe a suitable iterative joint source-channel decoding technique that exploits the correlations between the descriptions. Finally, we present several examples that illustrate the performance of the proposed system and compare it with other approaches.

关键词： Turbo codes Iterative decoding Wireless communication Receiving antennas Transmitting antennas Modulation coding Fading source coding Communication systems Multimedia communication

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On the extreme cases of the rate-distortion function for robust descriptions

On the extreme cases of the rate-distortion function for rob...

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IEEE International Symposium on Information Theory

作者： E. Tuncel K. Rose Department of Electrical and Computer Engineering University of California Santa Barbara USA

A multiterminal source coding scenario known as robust descriptions coding, where the source is to be encoded in a way that enables good descriptions for several distortion measures simultaneously is considered. Our r... 详细信息

关键词： Computer aided software engineering Rate-distortion Robustness Distortion measurement Databases source coding Encoding Information theory Electric variables measurement Humans

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An entropy measure for finite strings based on the Shannon entropy of a code set

An entropy measure for finite strings based on the Shannon e...

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IEEE International Symposium on Information Theory

作者： U. Speidel Department of Computer Science Tamaki Campus University of Auckland Auckland New Zealand

Nicolescu and Titchener showed that every finite string could be used to generate a unique recursively constructed variable-length code set belonging to the family of the T-codes. This paper proposes a conventional en... 详细信息

关键词： Entropy Computer science Decoding Logistics Uncertainty Current measurement Data compression Information science Robustness source coding

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Block coded modulation of combined Huffman and run length limited/error control codes

Block coded modulation of combined Huffman and run length li...

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Joint IST Symposium on Mobile Future, and the Symposium on Trends in Communications, SympoTIC

作者： M.A. Hosany K.M.S. Soyjaudah Faulty of Engineering Depamnent of Electrical and Electronic Engineering University of Mauritius Reduit Mauritius

A technique to combine the three processes of a digital communication system, namely source coding, channel coding and modulation, is presented. The proposed system employs Huffman code for source coding, run length limited/error control codes (RLL/ECC) for channel coding and binary frequency shift keying/multi-phase shift keying (BFSK/MPSK) for modulation. It is shown that a reduction of the overall complexity in the combined demodulator/decoder is obtained as compared to its separate counterparts. The error performances are also shown to yield similar results for both the combined and separate block coded modulation (BCM) schemes. The algorithms for the proposed BCM schemes are designed and implemented and their error performances are compared with those employing coded, as well as uncoded, MPSK modulation.

关键词： Modulation coding Error correction source coding Channel coding Digital communication Digital modulation Error correction codes Frequency shift keying Demodulation Decoding

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Iterative joint source/channel decoding for JPEG2000

Iterative joint source/channel decoding for JPEG2000

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Asilomar Conference on Signals, Systems & Computers

作者： Lingling Pu Zhenyu Wu A. Bilgin M.W. Marcellin B. Vasic Department of Electrical and Computer Engineering University of Arizona Tucson Tucson AZ USA

A framework for iterative joint source-channel decoding of JPEG2000 codestreams is presented in this paper. At the encoder, JPEG2000 is used to perform source coding with certain error resilience (ER) modes, and LDPC codes are used to perform channel coding. During decoding, the source decoder uses the ER modes to identify corrupt sections of the codestream and provides this information to the channel decoder. The decoding is carried out jointly in an iterative fashion. Our results indicate that the proposed method improves the convergence rate as well as the overall system performance.

关键词： Iterative decoding Parity check codes Transform coding Equations source coding Resilience Erbium Image coding PSNR Iterative algorithms

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Wyner-Ziv coding for video: applications to compression and error resilience

Wyner-Ziv coding for video: applications to compression and ...

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Data Compression Conference (DCC)

作者： A. Aaron S. Rane Rui Zhang B. Girod Information Systems Laboratory University of Stanford Stanford CA USA

Two separate applications of Wyner-Ziv coding of motion video coding are considered. The Wyner-Ziv theorem on source coding with side information available only at the decoder suggests that an asymmetric video codec, where individual frames are encoded separately, but decoded conditionally could achieve efficiency comparable to current interframe video compression systems. First results on the Wyner-Ziv coding scheme for motion video are reported that use interframe encoding, but interframe decoding. Secondly, Wyner-Ziv coding for the transmission of compressed video over an error-prone channel is applied. This coding scheme is used to generate a supplementary bit stream, which contains a coarsely quantized representation of the transmitted video signal. Using the conventionally decoded, error-concealed video signal as side information to decode the Wyner-Ziv bits, the transmission errors in the decoded video waveform are corrected up to a certain residual distortion, significantly improving the visual quality of the decoded video.

关键词： Video compression Resilience Decoding Error correction Video coding source coding Video codecs Signal generators Streaming media Distortion

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Lower bounds on the existence of binary error-correcting variable-length codes

Lower bounds on the existence of binary error-correcting var...

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IEEE (first ITW conference of the year) Information Theory Workshop (ITW)

作者： C. Lamy F.-X. Bergot Philips Research France Suresnes France THALES Communications Gennevilliers France Paris France

The paper deals with codes that combine source and channel encoding operations. After discussing the potential usefulness of these variable-length error correcting (VLEC) codes, necessary conditions on their length distribution are established. It is shown that, depending on the targetted application, several families of VLEC codes can be defined, whose conditions of existence differ.

关键词： Error correction codes Decoding AWGN source coding Binary phase shift keying Performance loss Forward error correction Fading Channel coding Wireless communication

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Power optimization of memoryless wireless media systems with space-time block codes

Power optimization of memoryless wireless media systems with...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： H. Jafarkhani H. Yousefi'zadeh M. Moshfeghi Department of Electrical Engineering and Computer Science University of California Irvine USA

In this research article, we present an analytical solution to the problem of power control in wireless media systems with multiple transmit antennas. We formulate an optimization problem aimed at minimizing total power consumption of wireless media systems subject to a given level of quality of service (QoS) and an available bit rate. Our formulation takes into consideration the power consumption related to source coding, channel coding, and transmission of multiple transmit antennas relying on the H.263 source coding standard, Rayleigh fading channels along with the Bernoulli loss model, and space-time block codes respectively.

关键词： Block codes Transmitting antennas Energy consumption Quality of service source coding Power control Bit rate Channel coding Code standards Fading

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Use of concatenated FEC coding for real-time packet video over heterogeneous wired-to-wireless IP networks

Use of concatenated FEC coding for real-time packet video ov...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Y. Pei J.W. Modestino Electrical and Computer Engineering Department University of Miami Coral Gables FL USA

In this paper, we address the problem of robust packet video transmission over heterogeneous wired-to-wireless IP networks. We propose the use of a concatenated FEC coding scheme employing interlaced Reed-Solomon (RS) codes and rate-compatible punctured convolutional (RCPC) codes to protect the video data from packet loss and bit errors, respectively. Furthermore, the performance of a joint source-channel coding (JSCC) approach employing this concatenated FEC coding scheme for video transmission is also studied. Results indicate that with an appropriate JSCC approach, concatenated FEC-based error-control techniques, together with passive error-recovery techniques, can significantly improve the effective video throughput and lead to acceptable video delivery quality over time-varying heterogeneous wired-to-wireless IP networks.

关键词： Concatenated codes IP networks Forward error correction Wireless networks Propagation losses Protection Fading Channel coding source coding Computer networks

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On source coding with side-information-dependent distortion measures

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IEEE TRANSACTIONS ON INFORMATION THEORY 2000年第7期46卷 2697-2704页

作者： Linder, T Zamir, R Zeger, K Queens Univ Dept Math & Stat Kingston ON K7L 3N6 Canada Tel Aviv Univ Dept Elect Engn Syst IL-69978 Ramat Aviv Israel Univ Calif San Diego Dept Elect & Comp Engn La Jolla CA 92093 USA

High-resolution bounds in lossy coding of a real memoryless source are considered when side information is present. Let X be a "smooth" source and let Y be the side information. First we treat the case when both the encoder and the decoder have access to Y and we establish an asymptotically tight thigh-resolution) formula for the conditional rate-distortion function R-X\Y(D) for a class of locally quadratic distortion measures which may be functions of th side information. We then consider the case when only the decoder has access to the side information (i.e., the "Wyner-Ziv problem"). For side-information-dependent distortion measures, we give an explicit formula which tightly approximates the Wyner-Ziv rate-distortion function R-WZ(D) for small D under some assumptions on the joint distribution of X and Y. These results demonstrate that for side-information-dependent distortion measures the rate loss R-WZ(D) - R-X\Y(D) can be bounded away from zero in the limit of small D. This contrasts the case of distortion measures which do not depend on the side information where the rate loss vanishes as D --> 0.

关键词： conditional rate distortion general distortion measures high-resolution theory Shannon lower bound side information source coding Wyner-Ziv problem

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