Search results for "Enna"

A 16QAM super-orthogonal space-frequency code for broadband mobile communication systems with two transmit antennas

2010

We combine our previously designed 32-state super-orthogonal space-time trellis code (SOSTTC) with orthogonal frequency division multiplexing (OFDM) to build a broadband mobile communication system having a spectral efficiency that amounts to 4 bits/s/Hz depending on the length of the cyclic prefix used to avoid interframe interference. The transmitter is equipped with two antennas, where the OFDM frames they transmit are not independent, as they carry the same information in an orthogonal form. The 2N OFDM tones are grouped in N pairs of tones. Each group of two tones transmits the entries of a 2×2 orthogonal matrix. In our case, the entries are symbols taken from the rectangular 16-point …

An OFDM Receiver Exploiting Multipath Diversity

2008

We propose a novel receiver structure, to be employed with standard Orthogonal Frequency Division Multiplexing transmitters, capable of exploiting the multipath diversity of wireless channels. The proposed technique is based on cancellation of inter-block interference arising in the guard interval and linear detection techniques. It features a low implementation complexity and is easily generalized to MIMO systems and non-linear detection techniques.

A survey of ovarian maturation in a population of Aristeus antennatus [Crustacea: Decapoda)

1995

ETTORE DE MARIA BERGLER E LA SICILIA DEI FLORIO. Dal paesaggismo di Francesco Lojacono al Liberty di Ernesto Basile e Vittorio Ducrot

2015

Ettore De Maria Bergler (Napoli, 1850 - Palermo, 1938) è uno dei maggiori esponenti dell’arte siciliana dell’Ottocento e del Novecento, apprezzato in occasione delle più importanti manifestazioni del periodo come l’Esposizione Internazionale d’Arte della città di Venezia. Allievo di Francesco Lojacono, occupa un posto di primo piano nel panorama della pittura di paesaggio fiorita in Sicilia e non solo, poiché la sua formazione non fu estranea alle scuole di Napoli e Firenze. Il volume, con rigoroso approccio metodologico, presenta opere inedite e testimonianze di valore che documentano la formazione di matrice europea dell’artista siciliano. Particolarmente felice fu il sodalizio, volto all…

Dati preliminari sulla variabilità della regione di controllo in Parapenaeus longirostris e Aristeus antennatus.

2007

Approximation method for computationally expensive nonconvex multiobjective optimization problems

2012

On solving computationally expensive multiobjective optimization problems with interactive methods

2014

Gli orti dell’ozio creativo. (Gli uffici il municipio) Vema 2006 (stato di avanzamento)

2006

Esplorazione progettuale prodotta per la 10. Biennale di Venezia. Lo spazio degli orti definisce il tessuto connettivo di Vema. Ritratta di un sistema poroso e labirintico, disponibile a un processo di progressiva appropriazione da parte dei futuri abitanti, una struttura aperta che reinterpreta, aggiornandolo all’attualità, il parco della Villa Radieuse lecorbuseriana. Tale spazio si integra a micro-strutture di servizio, destinate a modificare le opportunità di scambio interindividuale.

Minimization of a rectangular patch using genetic algorithms

2002

In recent years, the miniaturization of antennas have become more and more important, especially in connection with subscriber transceivers for cellular systems. Due to the multiple scattering environments and the almost indefinable operating scenario, the crosspolarization characteristics of the antenna are less important, however its physical size is critical. The attempts to reduce the physical size of the antenna made in the past, used classical methods, such as embedding the antenna in a dielectric medium of a high permittivity, adding a resistive element in series with the antenna, etc., but little effort was invested in simply generating other geometries, which by their intrinsic pro…

Miniaturization of rectangular microstrip patches using genetic algorithms

2002

This paper presents a new procedure for the miniaturization of rectangular microstrip patches based on genetic algorithms. The shape of a typical rectangular patch is modified in order to reduce its resonance frequency keeping the physical volume of the antenna constant. As an example, the resonance frequency of a square microstrip patch is reduced from 3 to 1.8 GHz. The patch is divided in 9/spl times/9 square cells. The genetic algorithm optimization procedure is subsequently used to remove some of the metallic cells. To validate the procedure an antenna prototype has been fabricated and tested. Good agreement is obtained between theoretical and experimental results.