The Experts below are selected from a list of 279 Experts worldwide ranked by ideXlab platform
J C Cartledge - One of the best experts on this subject based on the ideXlab platform.
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Pulse Distortion and power penalty induced by sinusoidal amplitude and phase response ripples for gaussian Pulses
Journal of Lightwave Technology, 2008Co-Authors: Ning Cheng, J C CartledgeAbstract:The frequency responses of wavelength-selective optical components often exhibit ripples in the amplitude and/or phase. These ripples can lead to signal Distortion and hence a degradation in system performance. The Pulse Distortion induced by sinusoidal amplitude and phase response ripples is derived for chirped and unchirped Gaussian Pulses, and closed-form expressions are presented for the power penalty in system performance. The analysis shows that the amplitude and phase response ripples have a similar impact on the transmitted signal, and that the power penalty induced by these ripples depends on the chirp and Pulsewidth of the transmitted signal. The combined effect of the characteristics of the transmitted signal and ripple parameters on system performance is discussed in detail. It is shown that the dependence of the maximum power penalty on the chirp parameter differs for amplitude and phase response ripples. The results of the theoretical analysis are in good agreement with numerical simulations.
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Pulse Distortion and power penalty induced by sinusoidal amplitude and phase response ripples for gaussian Pulses
Photonics North, 2005Co-Authors: Ning Cheng, J C CartledgeAbstract:Wavelength-selective optical components used in WDM optical communication systems often exhibit a transfer function with amplitude and phase ripples. These ripples can lead to signal Distortion and performance degradation. The Pulse Distortion induced by sinusoidal amplitude and phase response ripples is derived for Gaussian Pulses, and concise results are presented for the power penalty in system performance. The analysis shows that the amplitude and phase response ripples have a similar impact on the transmitted signal, and the power penalty induced by these ripples depends on the chirp and Pulse width of the transmitted signal. The combined effect of the characteristics of the transmitted signal and the ripple parameters on the system performance is discussed in detail. Numerical simulations show a good agreement with the theoretical analysis.
Robert C. Qiu - One of the best experts on this subject based on the ideXlab platform.
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Pulse Distortion Caused by Cylinder Diffraction and Its Impact on UWB Communications
IEEE Transactions on Vehicular Technology, 2007Co-Authors: Chenming Zhou, Robert C. QiuAbstract:One of the characteristics of ultrawideband (UWB) signals is Pulse Distortion, which is inherently determined by their huge bandwidth. Using a cylinder model as an example, Pulse Distortion and its impacts on UWB system performance have been investigated, based on the closed-form imPulse response first derived in this paper. Although a lot of papers have addressed the Pulse-Distortion issue, quantifying the impacts of Pulse Distortion on system performance appears to be novel. The simulation results show that the SNR loss caused by template mismatch could reach as high as 4 dB. It is also found that the range error caused by Pulse Distortion is much larger than the Cramer-Rao lower bound; thus, it is another fundamental source of errors limiting the accuracy of times of arrival of a received signal. These results have direct applications in timing synchronization and positioning.
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physics based Pulse Distortion for ultra wideband signals
IEEE Transactions on Vehicular Technology, 2005Co-Authors: Robert C. Qiu, Chenming Zhou, Qingchong LiuAbstract:Pulse Distortion is difficult to model by the state of the art statistical measurements. In this paper, we propose a physics-based deterministic model for urban environments consisting of high rise buildings. We first derive the channel imPulse response of the renowned Wolfisch-Bertoni model in closed form. This model captures many properties that are not available in the existing statistical models such as the IEEE 802.15.4a model. The closed form time domain solutions are in good agreement with the inverse fast Fourier transform (IFFT)-based frequency domain solutions. These solutions are important to understanding the system principle.
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Detection of Physics-Based Ultra-Wideband Signals Using Generalized RAKE in Presence of Inter-Symbol Interference
2006 Proceeding of the Thrity-Eighth Southeastern Symposium on System Theory, 1Co-Authors: J.q. Zhang, Robert C. QiuAbstract:The generalized rake receiver based on physics-based channel model is proposed for UWB outdoor application to estimate and compensate for the Pulse Distortion. The successive channel estimation is adopted to generate the per-path waveform as the template for the generalized rake receiver. The receiver can eliminate the effect of Pulse Distortion appearing in a lot of UWB channels. MMSE linear equalizer is used to handle intersymbol interference (ISI) for achieving high data rate
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WCNC - Optimum and sub-optimum detection of physics-based ultra-wideband signals in presence of inter-symbol interference
IEEE Wireless Communications and Networking Conference 2005, 1Co-Authors: Robert C. QiuAbstract:The paper represents a major step toward receiver structures under the framework of the per-path Pulse Distortion using more realistic channel models. We extend our previous framework to include the important phenomenon of inter-symbol interference (ISI). ISI ultimately limits the maximum achievable data rate. We find that the per-path Pulse Distortion has impact on this maximum achievable data rate in the presence of ISI. As examples of this discovery, we investigate the optimum receiver structure and two sub-optimum receivers with zero-forcing and minimum mean square error (MMSE) equalizers. We use the high-rise building channel model as the underlying Pulse propagation model. This model captures many properties that are not available in the IEEE 802.15.4a model.
Ning Cheng - One of the best experts on this subject based on the ideXlab platform.
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Pulse Distortion and power penalty induced by sinusoidal amplitude and phase response ripples for gaussian Pulses
Journal of Lightwave Technology, 2008Co-Authors: Ning Cheng, J C CartledgeAbstract:The frequency responses of wavelength-selective optical components often exhibit ripples in the amplitude and/or phase. These ripples can lead to signal Distortion and hence a degradation in system performance. The Pulse Distortion induced by sinusoidal amplitude and phase response ripples is derived for chirped and unchirped Gaussian Pulses, and closed-form expressions are presented for the power penalty in system performance. The analysis shows that the amplitude and phase response ripples have a similar impact on the transmitted signal, and that the power penalty induced by these ripples depends on the chirp and Pulsewidth of the transmitted signal. The combined effect of the characteristics of the transmitted signal and ripple parameters on system performance is discussed in detail. It is shown that the dependence of the maximum power penalty on the chirp parameter differs for amplitude and phase response ripples. The results of the theoretical analysis are in good agreement with numerical simulations.
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Pulse Distortion and power penalty induced by sinusoidal amplitude and phase response ripples for gaussian Pulses
Photonics North, 2005Co-Authors: Ning Cheng, J C CartledgeAbstract:Wavelength-selective optical components used in WDM optical communication systems often exhibit a transfer function with amplitude and phase ripples. These ripples can lead to signal Distortion and performance degradation. The Pulse Distortion induced by sinusoidal amplitude and phase response ripples is derived for Gaussian Pulses, and concise results are presented for the power penalty in system performance. The analysis shows that the amplitude and phase response ripples have a similar impact on the transmitted signal, and the power penalty induced by these ripples depends on the chirp and Pulse width of the transmitted signal. The combined effect of the characteristics of the transmitted signal and the ripple parameters on the system performance is discussed in detail. Numerical simulations show a good agreement with the theoretical analysis.
Daniel J. Gauthier - One of the best experts on this subject based on the ideXlab platform.
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Reducing Pulse Distortion in fast-light Pulse propagation through an erbium-doped fiber amplifier
Optics letters, 2007Co-Authors: Heedeuk Shin, Aaron Schweinsberg, George M. Gehring, Katie Schwertz, Hye Jeong Chang, Q-han Park, Robert W. Boyd, Daniel J. GauthierAbstract:When a Pulse superposed on a cw background propagates through an erbium-doped fiber amplifier with a negative group velocity, either Pulse broadening or Pulse compression can be observed. These effects can be explained in terms of two competing mechanisms: gain recovery and Pulse spectrum broadening. The Distortion of the Pulse shape caused by these effects depends on input Pulse width, pump power, and background-to-Pulse power ratio. With the proper choice of these three parameters, we can obtain significant Pulse advancement with minimal Pulse Distortion.
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Solitons go slow
Nature Photonics, 2007Co-Authors: Daniel J. GauthierAbstract:A new method for slowing down light Pulses while minimizing Pulse Distortion could help create practical photonic devices that route bits of information in optical-telecommunication systems.
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Pulse broadening or compression in fast-light Pulse propagation through an erbium-doped fiber amplifier
2007 Quantum Electronics and Laser Science Conference, 2007Co-Authors: Heedeuk Shin, Aaron Schweinsberg, George M. Gehring, Katie Schwertz, Hye Jeong Chang, Q-han Park, Daniel J. Gauthier, Robert W. BoydAbstract:Pulse broadening or compression in an Er3+-doped fiber amplifier is observed, and explained by gain recovery and Pulse spectrum broadening effects. Maximal Pulse advancement and minimal Pulse Distortion are obtained by optimizing these competing effects.
Jean-jacques P. Drolet - One of the best experts on this subject based on the ideXlab platform.
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Retardation and reduction of Pulse Distortion by group-velocity dispersion through Pulse shaping.
Optics letters, 1995Co-Authors: Danny Eliyahu, Randal A. Salvatore, Joseph Rosen, Amnon Yariv, Jean-jacques P. DroletAbstract:We show that a reduction in the Pulse Distortion caused by chromatic dispersion can be achieved through Pulse shaping. We argue that a simple binary phase mask in the Fourier plane of the laser spectrum can improve the transmission of short Pulses in a dispersive channel through reduced broadening. The argument was tested experimentally, and a good agreement was found with the theory.
