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Papers by Gabriele Falciasecca

The problem of unwanted detection of input noise interpreted as useful pulses in Delay Attenuate ... more The problem of unwanted detection of input noise interpreted as useful pulses in Delay Attenuate and Compare (DAC) circuits is considered. The performance of DAC alone is examined and compared to the performance when provided with two different protection circuits based on signal amplitude and signal width. Formulas for computing the false alarm time for Gaussian noise are computed and applied to several false alarm examples. The correctness of the formulas is verified by comparison with experimental results. Both types of circuits are found to assure the DAC circuit adequate protection for the L-band precision Distance Measuring Equipment case. In other applications requiring higher false alarm time the two circuits can be jointly adopted.

Electronics Letters, 1982

The appearance of radiation in open-waveguide directional couplers is discussed, as it can modify... more The appearance of radiation in open-waveguide directional couplers is discussed, as it can modify the behavior of the coupler. Analytical and numerical examples are presented to illustrate this modification. It is determined that when the phenomenon occurs, substantial changes in the decay of the electromagnetic field against the distance from the structure occur. The numerical method used is based on

[1991 Proceedings] 41st IEEE Vehicular Technology Conference

ABSTRACT The authors discuss the problems related to a proper definition and evaluation of spectr... more ABSTRACT The authors discuss the problems related to a proper definition and evaluation of spectral efficiency in order to find out which aspects are relevant for comparison among different solutions, and which aspects determine only the final absolute value. In particular, it is shown that different coverage strategies and propagation conditions not only affect the absolute value of spectral efficiency but also the comparison among different systems. The concept of a `scenario' for evaluation and comparison is introduced, and examples of computation of spectral efficiency are given in a deterministic and in a statistical scenario (in the presence of log-normal fading). A reference optimum system is introduced in order to be able to express system spectral efficiency in a relative way

IEEE Antennas and Propagation Magazine, 2010

; http://www Jgm.iU N ow it is official: The IEEE Board of Directors has approved the IEEE Histor... more ; http://www Jgm.iU N ow it is official: The IEEE Board of Directors has approved the IEEE History Committee's recommendation. Villa Griffone, with the first Marconi Lab, and the neighboring Celestini Hill, were recognized as an IEEE Milestone in Electrical Engi neering and Computing. The following are the citations:

Electronics Letters, 1974

Nasa Sti Recon Technical Report N, Dec 1, 1984

The analysis of transmission channels characterized by fast time variations due to the mobility o... more The analysis of transmission channels characterized by fast time variations due to the mobility of one of the stations is developed via a Gaussian wide sense stationary uncorrelated scattering model. A program to simulate the model for applications to mobile radio systems is described. The program is useful in the analysis of the attenuation statistics and waveforms in the presence of pulse modulation.

IEEE Transactions on Microwave Theory and Techniques, 1977

... allowed, in first approximation, for the circular electric modes TEO; , Page 5. FALCIASECCA A... more ... allowed, in first approximation, for the circular electric modes TEO; , Page 5. FALCIASECCA AND ROGAI : IMPERFECTIONS IN WAVBGUIDE SYSTEMS 915 !1 I [1] [2] [3] [4] [5] [6] ... XLV, no. 2, pp. 138-141, Feb. 1976. HE Rowe and WD Warters, “Transmission in ~ultimode wave-...

Network planning of modern personal communications systems has been accomplished so far on a manu... more Network planning of modern personal communications systems has been accomplished so far on a manual basis by means of heuristic solutions, but this process is quite time consuming and errors are frequent. Recently, a number of automatic procedures for optimally locating base stations have been developed. In the present paper we try to highlight the influence of the adopted multiple access scheme on the optimal base site locations, and therefore we analyse if and where the deployment of the base stations is eventually influenced. This aspect could be quite interesting in order to compare two existing systems and their flexibility in network optimization; but perhaps it is even more challenging to evaluate how a migration from one system to the other (e.g. from GSM to CDMA) can exploit the present base mesh and thus which difficulties the of the new system has to cope with

Electronics Letters, 2002

ABSTRACT The asymptotic performance of ray tracing (RT) simulators in terms of narrowband predict... more ABSTRACT The asymptotic performance of ray tracing (RT) simulators in terms of narrowband predictions is considered. From statistical models for urban propagation, an analytical formulation can be obtained to characterise RT asymptotic properties. The formation is exploited to develop an empirical model to speed-up simulation times

In 1909 Marconi was awarded the Nobel Prize in Physics. Although very young - he was thirty-five-... more In 1909 Marconi was awarded the Nobel Prize in Physics. Although very young - he was thirty-five-years old - he had proved how far his system of wireless telegraphy could work, from the first experiments carried out near Bologna, till the first commercial transatlantic service inaugurated in 1907. This successful path will be presented as well as some considerations on

Mutual interference between the 174 to 230 MHz television band transmission and mobile communicat... more Mutual interference between the 174 to 230 MHz television band transmission and mobile communication transmissions by the SST technique is reviewed. Theoretical aspects of SST electronic subsystem development are considered. An emphasis weighting function technique applied to a frequency hopping SST system is analyzed and compared to the operation of frequency hopping in regions of the television frequency band which are less sensitive to interference. The characteristics of measuring systems adapted to the research needs of SST development are discussed.

Fondazione Ugo Bordoni Land Mobile Radio Services Acts of the 2nd Conv, Jun 1, 1983

The structure of a geographic data base system based on a set of operators which allows an effici... more The structure of a geographic data base system based on a set of operators which allows an efficient man-machine interaction is discussed. The proposed system approaches the theoretical limit of two bytes for coding the points of a geographic network. Data processing is accomplished by repeating elementary operations on each of the surface elements composing the area of interest, and integrating the results using simple geographic operators. The operators for extraction, incorporation and selection of data are described. It is shown that a simple combination of geographic functions allows the efficient management of a data base with the described structure.

A computer program to calculate the parameters of an electric filter for higher circular modes is... more A computer program to calculate the parameters of an electric filter for higher circular modes is presented. Starting from a circular wave guide sliced along a diametral plane, a phase shift is introduced by a dielectric concentric solid half cylinder while the restitution of the original phase is performed on the other half volume using a concentric dielectric shell. The various parameters involved are discussed with regard to attenuation of higher modes. An example is given of a filter of good characteristics up to 60 GHz. The underlying mathematical analysis is outlined.

International Mobile Satellite Conference, 1990

The pan-European L-band terrestrial cellular system (GSM) is expected to provide service to more ... more The pan-European L-band terrestrial cellular system (GSM) is expected to provide service to more than 10 million users by the year 2000. Discussed here is the feasibility of a new satellite system at EHF (40/50 GHz) to complement, at the end of the decade, the GSM system or its decendants in order to provide additional services at 64 kbits/s, or so. The main system aspects, channel characteristics, technology issues, and both on-board and earth terminal architectures are highlighted. Based on the performed analyses, a proposal was addressed to the Italian Space Agency (ASI), aimed at the implementation of a national plan.

... L'elaborazione numerica dei segnali 197 239 Le reti a pacchetto 281 Giancarlo Prati Lafo... more ... L'elaborazione numerica dei segnali 197 239 Le reti a pacchetto 281 Giancarlo Prati Lafotonica ... In secondo luogo, nell'Ottocento, così come nel Novecento, non si ebbe solo una ... comunicazione orale fu data la possibilità di abbattere le barriere dello spazio e del tempo, sino ad ...

The general method for determination of electromagnetic fields guided by metallic cylindrical str... more The general method for determination of electromagnetic fields guided by metallic cylindrical structures is reviewed and applied to TE01 propagation in circular waveguides. The design criteria of propagation media are derived from the non-infinite conductivity of metallic walls and the propagation deformation effects on the TE01 mode. The effects of multi-mode propagation are discussed presenting a simplified model based on the coupled mode propagation equations, and the influence of curves and deformations are examined. The distortion and noise increase produced by mode reconversion are analyzed.