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 bi...
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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.
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...
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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 result is obtained by posing robust descriptions as a special case of successive refinement coding.
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...
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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 entropy function for the string that is defined as the Shannon entropy of the codeset generated by the string.
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 l...
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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.
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 ...
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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.
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, ...
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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.
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 di...
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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.
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 pow...
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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.
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)...
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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.
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 ...
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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.
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