The Experts below are selected from a list of 39 Experts worldwide ranked by ideXlab platform
Yuichiro Fujiwara - One of the best experts on this subject based on the ideXlab platform.
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Self-Synchronizing Pulse Position Modulation with Error Tolerance
2016Co-Authors: Yuichiro FujiwaraAbstract:Abstract—Pulse position modulation (PPM) is a popular signal modulation technique which converts signals into M-ary data by means of the position of a Pulse within a time interval. While PPM and its variations have great advantages in many contexts, this type of modulation is vulnerable to loss of synchronization, potentially causing a severe error floor or throughput penalty even when little or no noise is assumed. Another disadvantage is that this type of modulation typically offers no error correction mechanism on its own, making them sensitive to intersymbol interference and environmental noise. In this paper we propose a coding theoretic variation of PPM that allows for significantly more efficient symbol and frame synchronization as well as strong error correction. The proposed scheme can be divided into a synchronization layer and a modulation layer. This makes our technique compatible with major existing techniques such as standard PPM, multiPulse PPM, and expurgated PPM as well in that the scheme can be realized by adding a simple synchronization layer to one of these standard techniques. We also develop a generalization of expurgated PPM suited for the modulation layer of the proposed self-Synchronizing modulation scheme. This generalized PPM can also be used as stand-alone error-correcting PPM with a larger number of available symbols. Index Terms—Pulse position modulation, PPM, synchroniza-tion, error correction, self-Synchronizing code, comma-free code, combinatorial design, optical orthogonal code. I
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Self-Synchronizing Pulse Position Modulation With Error Tolerance
IEEE Transactions on Information Theory, 2013Co-Authors: Yuichiro FujiwaraAbstract:Pulse position modulation (PPM) is a popular signal modulation technique which converts signals into M-ary data by means of the position of a Pulse within a time interval. While PPM and its variations have great advantages in many contexts, this type of modulation is vulnerable to loss of synchronization, potentially causing a severe error floor or throughput penalty even when little or no noise is assumed. Another disadvantage is that this type of modulation typically offers no error correction mechanism on its own, making them sensitive to intersymbol interference and environmental noise. In this paper, we propose a coding theoretic variation of PPM that allows for significantly more efficient symbol and frame synchronization as well as strong error correction. The proposed scheme can be divided into a synchronization layer and a modulation layer. This makes our technique compatible with major existing techniques such as standard PPM, multiPulse PPM, and expurgated PPM as well in that the scheme can be realized by adding a simple synchronization layer to one of these standard techniques. We also develop a generalization of expurgated PPM suited for the modulation layer of the proposed self-Synchronizing modulation scheme. This generalized PPM can also be used as stand-alone error-correcting PPM with a larger number of available symbols.
Zhang Peng - One of the best experts on this subject based on the ideXlab platform.
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TV Line Frequency Assisting PD Method to Eliminate the Interference of PD Frequency
China Digital Cable TV, 2008Co-Authors: Zhang PengAbstract:When adopting the TV transmitter with FS technology, there often appears a phenomenon that PD frequency interferes with the picture.This is due to the PD frequency being out of sync with the line frequency.This paper introduces the video line Synchronizing Pulse assisting PD method to eliminate the interference of PD frequency and briefly describes the theory of EXOR gate.
B. Behari - One of the best experts on this subject based on the ideXlab platform.
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An IC Synchronizing Pulse Generator for a High Resolution TV System
Iete Journal of Research, 2015Co-Authors: B. BehariAbstract:This paper deals with the design considerations of a Synchronizing Pulse generator with integrated circuits for a high resolution television system. A high resolution TV system is needed for various applications such as data-transmission, high quality picture recording etc.
Deng Yun-peng - One of the best experts on this subject based on the ideXlab platform.
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Analysis of Factors Influencing Measurement Veracity of Cigarette Air Leakage in PASSIM Cigarette Making and Tipping Machine Combination
Tobacco Science & Technology, 2004Co-Authors: Luo Cai-li, Wang Gui-lü, Deng Yun-pengAbstract:The factors influencing measurement veracity of cigarette air leakage in PASSIM 7000 cigarette making and tipping machine combination were analyzed including: cigarette quality, Synchronizing Pulse, correction, suction cowl, compression amount, seal ring, cigarette-missing detection and negative pressure. The improving measures were: 1) adding operating screen for clear display and convenient maintenance; 2) maintaining regularly.
David Pointcheval - One of the best experts on this subject based on the ideXlab platform.
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dynamic group die hellman key exchange under standard assumptions full version
2002Co-Authors: Emmanuel Bresson, Olivier Chevassut, David PointchevalAbstract:An automatic leveling circuit for a composite video signal is disclosed for use in a modem in a microwave communications system for adjusting the level of the signal at the transmitter while maintaining studio quality. The circuit employs an operational amplifier as the variable gain element and employs a light emitting diode photo-conductor pair in association with the amplifier to control the amplifier gain. In particular, the horizontal Synchronizing Pulse from the composite video signal is separated and used with a keyed clamp to establish the video at a desired dc reference value and is applied to a sample and hold circuit where the sampled Pulse amplitude is held for comparison to an operator adjusted value. The output of the comparator is then used to control the light produced by the light emitting diode in a degenerative sense to hold the video level at the operator adjusted value. The range of level adjustment is typically 6db, and differential gain and differential phase are maintained to studio standards.
