The Experts below are selected from a list of 252 Experts worldwide ranked by ideXlab platform
Kazuhito Tajima - One of the best experts on this subject based on the ideXlab platform.
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penalty free error free all optical Data Pulse regeneration at 84 gb s by using a symmetric mach zehnder type semiconductor regenerator
IEEE Photonics Technology Letters, 2001Co-Authors: Y Ueno, S Nakamura, Kazuhito TajimaAbstract:Penalty-free Data-Pulse regeneration at 84 Gb/s was achieved down to an error rate level of 1/spl times/10/sup -11/ by using a Data pattern length of 2/sup 31/-1. A symmetric-Mach-Zehnder-type all-optical polarization-insensitive semiconductor regenerator was used.
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Penalty-free error-free all-optical Data Pulse regeneration at 84 Gbps with symmetric-Mach-Zehnder-type regenerator
OFC 2001. Optical Fiber Communication Conference and Exhibit. Technical Digest Postconference Edition (IEEE Cat. 01CH37171), 1Co-Authors: Y Ueno, S Nakamura, Kazuhito TajimaAbstract:We have achieved penalty-free Data Pulse regeneration at 84 Gbps down to an error rate level of 10/sup -11/ with a pseudorandom Data pattern length of 2/sup 31/-1 for a time division multiplexing (TDM) optical communication system. An all-optical interferometric semiconductor regenerator was used.
Zhizhang Chen - One of the best experts on this subject based on the ideXlab platform.
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Full length article: Code-shifted reference transceiver for imPulse radio ultra-wideband systems
Physical Communication, 2009Co-Authors: Hong Nie, Zhizhang ChenAbstract:In this paper, a novel type of transceiver for imPulse radio ultra-wideband systems, the code-shifted reference transceiver, has been proposed to remove the delay element with an ultra wide bandwidth required by the transmitted reference transceiver. As compared to the frequency-shifted reference transceiver that removes the delay element through separating the reference and Data Pulse sequences with a group of analog carriers, the code-shifted reference transceiver separates the reference and Data Pulse sequences with a set of shifting and detection codes selected from Walsh codes. Therefore, the performance evaluations obtained from both theoretical analysis and computer simulations show that in conjunction with a much lower system complexity, the code-shifted reference transceiver can achieve a much better bit-to-error rate performance than the frequency-shifted reference transceiver can.
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CNSR - Code-Shifted Reference Ultra-Wideband (UWB) Radio
6th Annual Communication Networks and Services Research Conference (cnsr 2008), 2008Co-Authors: Hong Nie, Zhizhang ChenAbstract:In this paper, a code-shifted reference ultra-wideband (CSR-UWB) transceiver, which separates the reference Pulse sequence and the Data Pulse sequences with a set of shifting and detection codes selected from Walsh codes, has been proposed to remove the ultra wideband delay element required by the transmitted reference UWB transceiver. As compared to the frequency-shifted reference UWB transceiver, which also can remove the delay element through separating the reference Pulse sequence and the Data Pulse sequences with a group of analog carriers, the CSR-UWB transceiver has lower complexity as well as much better bit-error rate performance.
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VTC Fall - Differential Code-Shifted Reference Ultra-Wideband (UWB) Radio
2008 IEEE 68th Vehicular Technology Conference, 2008Co-Authors: Hong Nie, Zhizhang ChenAbstract:In this paper, a differential code-shifted reference ultra-wideband (CSR UWB) transceiver has been proposed to reduce the power spent to transmit the reference Pulse sequence so as to improve the bit-error rate performance of the systems. In the differential CSR UWB transceiver, by differentially encoding M information bits to be transmitted simultaneously, one Data Pulse sequence can be used as the reference sequence of another Data Pulse sequence. Therefore, the power used to transmit the reference Pulse sequence can be reduced from half to 1/(M+1) of the total power. The evaluation results obtained from the computer simulations have shown that as compared to the original CSR UWB transceiver, the differential CSR UWB transceiver has much better bit-error rate performance with comparable system complexity.
Moe Z. Win - One of the best experts on this subject based on the ideXlab platform.
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on the power spectral density of digital Pulse streams generated by m ary cyclostationary sequences in the presence of stationary timing jitter
IEEE Transactions on Communications, 1998Co-Authors: Moe Z. WinAbstract:The spectral occupancy and composition of a chosen digital signaling technique when the Data Pulse stream is nonideal, due, for instance, to implementation imperfections, are important considerations in the design of a practical communication system. One source of imperfection is timing jitter where the rising and falling transitions do not occur at the nominal Data transition time instants; nevertheless, the time instants are offset by random amounts relative to the nominal one. The amount of timing shift per transmission interval is random and is typically characterized by a discrete stationary random process (independent of the Data sequence) with known statistical properties. The purpose of this paper is to characterize the power spectral density (PSD) of baseband signaling schemes in the presence of arbitrary timing jitter. Although general PSD results are first obtained for arbitrary timing jitter statistics, specific results are then given for the cases of practical interest, namely, uniform and Gaussian-distributed jitter. Examples of an uncorrelated Data Pulse stream, an independent identically distributed Data stream, and a Markov source are given. Interesting results emerge when the generating sequence {a/sub n/} is uncorrelated. For generating sequences {a/sub n/} that are nonzero-mean, timing jitter has the effect of widening the main lobe of the spectrum and increasing the sidelobes. When the generating sequence is zero-mean and uncorrelated, a rather surprising result is that the timing jitter does not affect the PSD. Simulation results are also presented to verify the analysis.
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Power Spectral Density of Digital Pulse Streams in the Presence of Timing Jitter
1996Co-Authors: Moe Z. Win, S. Million, M. K. SimonAbstract:The spectral occupancy and composition of a chosen digital signaling technique when the Data Pulse stream is nonideal, due for instance to implementation imperfections, are important considerations in the design of a practical communication system. One source of imperfection is timing jitter where the rising and falling transitions do not occur at the nominal Data transition time instants; nevertheless, the time instants are ofiset by random amounts relative to the nominal one. The amount of timing shift per transmission interval is random and typically is characterized by a discrete random process (independent of the Data sequence) with known statistical properties. The purpose of this article is to characterize the power spectral density (PSD) of baseband signaling schemes in the presence of arbitrary timing jitter. Although general PSD results are flrst obtained for arbitrary timing jitter statistics, speciflc results are then given for the cases of practical interest, namely, uniform and Gaussian distributed jitter. Examples of an uncorrelated Data Pulse stream, an independent identically distributed Data stream, and Markov sources are given. Interesting results emerge when the generating sequencefang is uncorrelated. For generating sequences fang that are nonzero mean, timing jitter has the efiect of widening the main lobe of the spectrum and increasing the side lobes. When the generating sequence is zero mean and uncorrelated, a rather surprising result is that the timing jitter does not afiect the PSD. Simulation results are also presented to verify the analysis. I. Introduction The spectral occupancy and composition of a chosen digital signaling technique are important considerations in the design of a communication system. These spectral properties can be derived from knowledge of the technique’s power spectral density (PSD), which in the general case consists of both continuous and discrete components. Evaluation of the PSD for ideal synchronous Data Pulse streams (a baseband Data waveform with a flxed transmission interval and flxed transmission epochs where the underlying Data sequence has known statistical properties and the transmitted waveform is a single known Pulse shape) is well documented in the literature (see [1, Chapter 2], for example). Most often the Data sequence that generates the Pulse stream is either wide sense stationary (WSS) or, more generally, wide sense cyclostationary (WSCS), both of which result in a Pulse stream that is a WSCS process.
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Power spectral density of binary digital Pulse streams in the presence of independent uniform timing jitter
MILCOM 97 MILCOM 97 Proceedings, 1Co-Authors: Moe Z. WinAbstract:The spectral occupancy and composition of a chosen digital signaling technique when the Data Pulse stream is nonideal, due for instance to implementation imperfections, are important considerations in the design of a practical communication system. One source of imperfection is timing jitter where the rising and falling transitions do not occur at the nominal Data transition time instants, nevertheless, the time instants are offset by random amounts relative to the nominal one. The amount of timing shift per transmission interval is random and is typically characterized by a discrete stationary random process (independent of the Data sequence). The purpose of this paper is to characterize the power spectral density (PSD) of baseband binary Data streams in the presence of uniform timing jitter. Examples of uncorrelated Data Pulse stream, and i.i.d. Data stream are given. Interesting results emerge when the generating sequence {a/sub n/} is uncorrelated. For generating sequences {a/sub n/} that are non-zero mean, timing jitter has the effect of widening the main lobe of the spectrum and increasing the sidelobes. When the generating sequence is zero mean and uncorrelated, a rather surprising result is that the timing jitter does not effect the PSD. Simulation results are also presented to verify the analysis.
Y Ueno - One of the best experts on this subject based on the ideXlab platform.
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penalty free error free all optical Data Pulse regeneration at 84 gb s by using a symmetric mach zehnder type semiconductor regenerator
IEEE Photonics Technology Letters, 2001Co-Authors: Y Ueno, S Nakamura, Kazuhito TajimaAbstract:Penalty-free Data-Pulse regeneration at 84 Gb/s was achieved down to an error rate level of 1/spl times/10/sup -11/ by using a Data pattern length of 2/sup 31/-1. A symmetric-Mach-Zehnder-type all-optical polarization-insensitive semiconductor regenerator was used.
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Penalty-free error-free all-optical Data Pulse regeneration at 84 Gbps with symmetric-Mach-Zehnder-type regenerator
OFC 2001. Optical Fiber Communication Conference and Exhibit. Technical Digest Postconference Edition (IEEE Cat. 01CH37171), 1Co-Authors: Y Ueno, S Nakamura, Kazuhito TajimaAbstract:We have achieved penalty-free Data Pulse regeneration at 84 Gbps down to an error rate level of 10/sup -11/ with a pseudorandom Data pattern length of 2/sup 31/-1 for a time division multiplexing (TDM) optical communication system. An all-optical interferometric semiconductor regenerator was used.
Hong Nie - One of the best experts on this subject based on the ideXlab platform.
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Full length article: Code-shifted reference transceiver for imPulse radio ultra-wideband systems
Physical Communication, 2009Co-Authors: Hong Nie, Zhizhang ChenAbstract:In this paper, a novel type of transceiver for imPulse radio ultra-wideband systems, the code-shifted reference transceiver, has been proposed to remove the delay element with an ultra wide bandwidth required by the transmitted reference transceiver. As compared to the frequency-shifted reference transceiver that removes the delay element through separating the reference and Data Pulse sequences with a group of analog carriers, the code-shifted reference transceiver separates the reference and Data Pulse sequences with a set of shifting and detection codes selected from Walsh codes. Therefore, the performance evaluations obtained from both theoretical analysis and computer simulations show that in conjunction with a much lower system complexity, the code-shifted reference transceiver can achieve a much better bit-to-error rate performance than the frequency-shifted reference transceiver can.
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CNSR - Code-Shifted Reference Ultra-Wideband (UWB) Radio
6th Annual Communication Networks and Services Research Conference (cnsr 2008), 2008Co-Authors: Hong Nie, Zhizhang ChenAbstract:In this paper, a code-shifted reference ultra-wideband (CSR-UWB) transceiver, which separates the reference Pulse sequence and the Data Pulse sequences with a set of shifting and detection codes selected from Walsh codes, has been proposed to remove the ultra wideband delay element required by the transmitted reference UWB transceiver. As compared to the frequency-shifted reference UWB transceiver, which also can remove the delay element through separating the reference Pulse sequence and the Data Pulse sequences with a group of analog carriers, the CSR-UWB transceiver has lower complexity as well as much better bit-error rate performance.
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VTC Fall - Differential Code-Shifted Reference Ultra-Wideband (UWB) Radio
2008 IEEE 68th Vehicular Technology Conference, 2008Co-Authors: Hong Nie, Zhizhang ChenAbstract:In this paper, a differential code-shifted reference ultra-wideband (CSR UWB) transceiver has been proposed to reduce the power spent to transmit the reference Pulse sequence so as to improve the bit-error rate performance of the systems. In the differential CSR UWB transceiver, by differentially encoding M information bits to be transmitted simultaneously, one Data Pulse sequence can be used as the reference sequence of another Data Pulse sequence. Therefore, the power used to transmit the reference Pulse sequence can be reduced from half to 1/(M+1) of the total power. The evaluation results obtained from the computer simulations have shown that as compared to the original CSR UWB transceiver, the differential CSR UWB transceiver has much better bit-error rate performance with comparable system complexity.
