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Transmission Techniques for Downlink Multi-Antenna MC-CDMA Systems in a Beyond-3G Context
Portier Fabrice,Raos Ivana,Silva Adao,Baudais Jean-Yves,Helard Jean-Francois,Gameiro Atilio,Zazo Santiago The Korea Institute of Information and Commucation 2005 Journal of communications and networks Vol.7 No.2
The combination of multiple antennas and multi-carrier code division multiple-access (MC-CDMA) is a strong candidate for the downlink of the next generation mobile communications. The study of such systems in scenarios that model real-life trans-missions is an additional step towards an optimized achievement. We consider a realistic MIMO channel with two or four transmit antennas and up to two receive antennas, and channel state information (CSI) mismatches. Depending on the mobile terminal (MT) class, its number of antennas or complexity allowed, different data-rates are proposed with turbo-coding and asymptotic spectral efficiencies from 1 to 4.5 bit/s/Hz, using three algorithms developed within the European IST-MATRICE project. These algorithms can be classified according to the degree of CSI at base-station (BS): i) Transmit space-frequency prefiltering based on constrained zero-forcing algorithm with complete CSI at BS; ii) transmit beamforming based on spatial correlation matrix estimation from partial CSI at BS; iii) orthogonal space-time block coding based on Alamouti scheme without CSI at BS. All presented schemes require a reasonable complexity at MT, and are compatible with a single-antenna receiver. A choice between these algorithms is proposed in order to significantly improve the performance of MC-CDMA and to cover the different environments considered for the next generation cellular systems. For beyond-3G, we propose prefiltering for indoor and pedestrian microcell environments, beamforming for suburban macrocells including high-speed train, and space-time coding for urban conditions with moderate to high speeds.
Application of Hybrid Polymeric Complexes to Solid State and Materials Chemistry
Josik Portier,Guy Campet,Nadine Treuil,Armel Poquet,Kim, Young Il,Kwon, Soon Jae,Kwak, Seo Young,Choy, Jin Ho Korean Chemical Society 1998 대한화학회지 Vol.42 No.4
A bird's-eye view on preparation, structure and properties of polymeric complexes in the field of Inorganic-Organic-Hybrids is presented in the view point of solid state and materials chemistry. These materials are useful precursors for preparing nanoparticles and fine grain oxides. Some of them are electroactive and are used as protonic or lithium electrolytes, electrochromic materials or membranes for sensors and actuators. New results on bio-hybrids, a class of material not far from polymeric complexes, are also described.
Josik Portier,Guy Campet Korean Chemical Society 1997 대한화학회지 Vol.41 No.8
The acid strngth of cations, determined with ICP (Ionic Covalent Parameter): ICP=log(P)-1.38x+2.07 where P is the polarizing power and X its electronegativity expresses the competition between the covalent and ionic forces. This concept, together with electronegativity, is used to describe the properties of oxides with various electronic properties (insulators, metals, degenerate semiconductors, superconductors).
Josik Portier,Guy Campet Korean Chemical Society 1997 대한화학회지 Vol.41 No.8
A simple relation exists between electronegativities of cations and their oxidation states and ionic radii. An empirical law is proposed: X = 0.274 z-0.15 z r - 0.01 r+1+${\alpha}$, z being oxidation number, r ionic radius in $\AA$ and ${\alpha}$ a term related to the atomic number. this relation permits to calculate an electronegativity scale covering a large set of electronic and crystallographic situations. An application to the calculation of acid strengths of cations is presented.
Revisiting the estimation of the error density in functional autoregressive models
Nadine Hilgert,Bruno Portier 한국통계학회 2015 Journal of the Korean Statistical Society Vol.44 No.4
In this paper, we study some asymptotic properties of a new estimator of the probability density function of the driven noise in a nonparametric functional autoregressive model. This density estimator, based on the kernel method, does not require the estimation of the residuals of the model (as in the usual plug-in estimator). We prove its pointwise consistency with rate and establish a multivariate central limit theorem, without any assumption on the noise distribution tail. Theoretical results are illustrated with some simulation experiments. We finally propose a goodness-of-fit test of the error distribution, built from a normalized sum of the quadratic deviation between the true density and its estimator evaluated on a finite set of distinct points.
Economic Integration, Asymmetries and the Desirability of a Monetary Union
Carre´, Martine,Levasseur, Sandrine,Portier, Franck 세종대학교 국제경제연구소 2000 Journal of Economic Integration Vol.15 No.2
Symmetry of shocks across countries is often considered as a necessary condition for a monetary union. We show that the measure of shocks symmetry does not reveal a deep parameter, and depends on economic integration. The more integrated economies are, the more asymmetric are GDPs for a given set of sectoral shocks.