A sender wants to accurately convey information to a receiver who has some, possibly related, data. We study the expected number of bits the sender must transmit for one and for multiple instances in two communication...
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A sender wants to accurately convey information to a receiver who has some, possibly related, data. We study the expected number of bits the sender must transmit for one and for multiple instances in two communication scenarios and relate this number to the chromatic and Korner entropies of a naturally defined graph.
A rate-distortion problem is considered for a triangular communication system (TCS), which has one encoder f and two decoders g(X) and g(Y). The encoder f maps correlated source outputs (X(K),Y-K) to two codewords W-X...
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A rate-distortion problem is considered for a triangular communication system (TCS), which has one encoder f and two decoders g(X) and g(Y). The encoder f maps correlated source outputs (X(K),Y-K) to two codewords W-X and W-Y, which are sent to g(X) and g(Y), respectively, The decoders g(X) and g(Y) can communicate with each other via rate-constrained channels as many times as they need, and g(X) reproduces (X) over tilde(K) while g(Y) reproduces (Y) over tilde(K). The admissible rate-distortion region is determined for this TCS, Furthermore, the relations between the TCS and the Gray-Wyner system, Wyner's common information, Yamamoto's cascade communication system, and the successive refinement system are discussed.
We discuss the interest of escort distributions and Renyi entropy in the context of source coding. We first recall a source coding theorem by Campbell relating a generalized measure of length to the Renyi-Tsallis entr...
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We discuss the interest of escort distributions and Renyi entropy in the context of source coding. We first recall a source coding theorem by Campbell relating a generalized measure of length to the Renyi-Tsallis entropy. We show that the associated optimal codes can be obtained using considerations on escort-distributions. We propose a new family of measure of length involving escort-distributions and we show that these generalized lengths are also bounded below by the Renyi entropy. Furthermore, we obtain that the standard Shannon codes lengths are optimum for the new generalized lengths measures, whatever the entropic index. Finally, we show that there exists in this setting an interplay between standard and escort distributions. (C) 2009 Elsevier B.V. All rights reserved.
Double-edged pulsewidth modulation (DPWM) is less sensitive to frequency-dependent losses in electrical chip-to-chip interconnects. However, the DPWM scheme instantaneously transmits information at a different rate th...
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Double-edged pulsewidth modulation (DPWM) is less sensitive to frequency-dependent losses in electrical chip-to-chip interconnects. However, the DPWM scheme instantaneously transmits information at a different rate than a synchronous source. This paper presents an 8-/9-bit line-coding scheme to compensate for the timing skew between the DPWM and synchronous clock domains while limiting the size of buffering required in the transmitter and receiver. Furthermore, preemphasis is introduced and analyzed as a means to improve the signal integrity of a DPWM signal. A multiphase-based, time interleaving receiver architecture using a sense amplifier is presented for high-speed data recovery. The DPWM transceiver is implemented in a 45-nm CMOS Silicon on insulator and operates at 10 Gbit/s with 10(-12) bit error rate and consumes 96 mW. The power consumption of the 8-/9-bit coding hardware is 1.5 mW at 10 Gbit/s demonstrating low-power overhead.
It is claimed that an all-digital system will provide true high-definition television quality and coverage area equivalent to NTSC without noise and interference. Less transmission power may be required, and the signa...
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It is claimed that an all-digital system will provide true high-definition television quality and coverage area equivalent to NTSC without noise and interference. Less transmission power may be required, and the signal will be easy to encrypt. The proposed source coding algorithms are reviewed, and the methods by which they are used in the proposed digital HDTV terrestrial broadcasting systems are discussed.< >
The digital spectrum-compatible high-definition television (DSC-HDTV) system, a digital HDTV simulcast system designed for United States terrestrial broadcasting on currently unassignable channels, is described. The s...
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The digital spectrum-compatible high-definition television (DSC-HDTV) system, a digital HDTV simulcast system designed for United States terrestrial broadcasting on currently unassignable channels, is described. The system uses progressively scanned source signals and is characterized by an effective, high-performance video compression system. Compression includes motion compensation with hierarchical block matching and block transform coding with adaptive quantization according to perceptual criteria. Video compression is designed to simplify the receiver decoding; only a few VLSI chips and only one full frame memory are required. The source signal, source coding, channel coding, modulation, and performance of the system are discussed.
The ATVA-progressive system, an all-digital high-definition television system that delivers very high quality pictures to the home within a 6-MHz channel in the presence of noise, ghosts, and frequency distortion is d...
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The ATVA-progressive system, an all-digital high-definition television system that delivers very high quality pictures to the home within a 6-MHz channel in the presence of noise, ghosts, and frequency distortion is described. The system achieves a high degree of data compression by means of motion compensation and transform/subband coding, and only transform/subband coefficients with significant energy are transmitted. For terrestrial transmission, an all-digital format that uses a single carrier with double sideband suppressed carrier quadrature modulation is used. The source signal, source coding, channel coding, modulation, and performance of the system are discussed.< >
The three key elements of the advanced digital television (ADTV) system are described. These elements are source coding based on MPEG++ data compression, channel coding based on a prioritized data transport, and modul...
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The three key elements of the advanced digital television (ADTV) system are described. These elements are source coding based on MPEG++ data compression, channel coding based on a prioritized data transport, and modulation techniques based on spectrally shaped QAM. The performance of the ADTV system is discussed.
The feasibility of three specific coding schemes for compact storage or fast transmission of radiographic images is investigated. These schemes are: the synthetic high system, the block-coding system, and the run-leng...
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The feasibility of three specific coding schemes for compact storage or fast transmission of radiographic images is investigated. These schemes are: the synthetic high system, the block-coding system, and the run-length coding system. The last two techniques are used for encoding bit planes. The dependence of the compression ratio on image resolution and the feasibility of adaptive coding of bit planes are also examined.
A multi-terminal network, in which an encoder is assisted by a side-information-aided helper, describes a memoryless identically distributed source to a receiver, is considered. The encoder provides a non-causal one-s...
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A multi-terminal network, in which an encoder is assisted by a side-information-aided helper, describes a memoryless identically distributed source to a receiver, is considered. The encoder provides a non-causal one-shot description of the source to both the helper and the receiver. The helper, which has access to causal side-information, describes the source to the receiver sequentially by sending a sequence of causal descriptions depending on the message conveyed by the encoder and the side-information subsequence it has observed so far. The receiver reconstructs the source causally by producing on each time unit an estimate of the current source symbol based on what it has received so far. Given a reconstruction fidelity measure and a maximal allowed distortion, we derive the rates-distortion region for this setting and express it in terms of an auxiliary random variable. When the source and side-information are drawn from an independent identically distributed Gaussian law and the fidelity measure is the squared-error distortion we show that for the evaluation of the rates-distortion region it suffices to choose the auxiliary random variable to be jointly Gaussian with the source and side-information pair.
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