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Mathematical Model of Non-Coherent-DLL Discriminator Output and Multipath Envelope Error for BOC (α, β) Modulated Signals

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Positioning 2013年第1期4卷 65-79页

作者： Khaled Rouabah Chebir Saifeddine Salim Atia Mustapha Flissi Djamel Chikouche Electronics department LMSE Laboratory University of Mohamed El-Bachir El-Ibrahimi Bordj Bou Arréridj Algeria electronis department LIS Laboratory University of M’sila M’sila Algeria

In this paper we propose the derivation of the expressions for the non-coherent Delay Locked Loop (DLL) Discriminator Curve (DC) in the absence and presence of Multipath (MP). Also derived, are the expressions of MP tracking errors in non-coherent configuration. The proposed models are valid for all Binary Offset Carrier (BOC) modulated signals in Global Navigation Satellite Systems (GNSS) such as Global Positioning System (GPS) and Future Galileo. The non-coherent configuration is used whenever the phase of the received signal cannot be estimated and thus cannot be demodulated. Therefore, the signal must be treated in a transposed band by the non-coherent DLL. The computer implementations show that the proposed models coincide with the numerical ones.

关键词： BOC Modulation GNSS PRN Code Multipath Discriminator Envelope Error

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Temperature Effects of Parabolic Linear Bound Potential and Coulomb Bound Potential Quantum Dot Qubit

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Communications in Theoretical Physics 2009年第10期52卷 601-605页

作者： CHEN Ying-Jie XIAO Jing-Lin College of Physics and Engineering Qufu Normal University Qufu 273165 China department of Physics and Electromechanics Inner Mongolia National University Tongliao 028043 China

On the condition of electric-LO phonon strong coupling in a parabolic quantum dot,we obtain theeigenenergy and the eigenfunctions of the ground state and the first-excited state using the variational method ofPekar *** system in a quantum dot may be employed as a two-level quantum *** the electronis in the superposition state of the ground state and the first-excited state,we obtain the time evolution of the *** relations of the probability density of electron on the temperature and the electron-LO-phonon couplingconstant and the relations of the period of oscillation on the temperature,the electron-LO-phonon coupling constant,the Coulomb binding parameter and the confinement length are *** results show that the probability densityof electron oscillates with a period when the electron is in the superposition state of the ground and the first-excitedstate,and show that there are different laws that the probability density of electron and the period of oscillation changewith the temperature and the electron-LO-phonon coupling constant when the temperature is lower or *** is obtained that the period of oscillation decreases with increasing the Coulomb bound potential and increases withincreasing the confinement length not only at lower temperatures but also at higher temperatures.

关键词： quantum dot qubit Coulomb potential temperature effect

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