1,548 research outputs found

    A Low-Complexity Graph-Based LMMSE Receiver Designed for Colored Noise Induced by FTN-Signaling

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    We propose a low complexity graph-based linear minimum mean square error (LMMSE) equalizer which considers both the intersymbol interference (ISI) and the effect of non-white noise inherent in Faster-than-Nyquist (FTN) signaling. In order to incorporate the statistics of noise signal into the factor graph over which the LMMSE algorithm is implemented, we suggest a method that models it as an autoregressive (AR) process. Furthermore, we develop a new mechanism for exchange of information between the proposed equalizer and the channel decoder through turbo iterations. Based on these improvements, we show that the proposed low complexity receiver structure performs close to the optimal decoder operating in ISI-free ideal scenario without FTN signaling through simulations.Comment: 6 pages, 6 figures, IEEE Wireless Communications and Networking Conference 2014, Istanbul, Turke

    Steady state entanglement of two atoms created by classical driving field

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    The stabilization of steady state entanglement caused by action of a classical driving field in the system of two-level atoms with the dipole interaction accompanied by spontaneous emission is discussed. An exact solution shows that the maximum amount of concurrence that can be achieved in Lamb-Dicke limit is 0.43, which corresponds to the entanglement Emax=0.285\mathcal{E}_{max}=0.285 ebit. Dependence of entanglement on interatomic distance and classical driving field is examined numerically.Comment: 14 pages, 2 figure

    1-Bromopropane Capture with Hydrophobic Zeolites: Force Field Development and Molecular Simulations

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    1-Bromopropane is a solvent used in various industrial and commercial applications. United States Environmental Protection Agency recently concluded that 1-bromopropane posed unreasonable risks to human health in several conditions of use. In this work, the adsorption of 1-bromopropane vapors in zeolites was investigated using molecular simulations. First, a united-atom model of 1-bromopropane was developed and the model was validated to reproduce vapor-liquid equilibrium properties of 1-bromopropane by carrying out Gibbs ensemble Monte Carlo simulations. The new model was then used to investigate the capture of 1-bromopropane in hydrophobic zeolites with Monte Carlo simulations in the grand canonical ensemble. The results show that a filtering system that consists of MRE and STW zeolites can capture 1-bromopropane within its ambient concentration range that occurs as a result of 1-bromopropane release in various industrial and commercial applications as identified by the US EPA. While MRE zeolite has the optimal pore size that provides favorable host-guest interactions to capture 1-bromopropane at extremely low concentrations, rapid condensation of 1-bromopropane occurs at relatively higher concentrations in the intersections of narrow helical and straight pores in the STW zeolite
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