A. Vernucci

Space Engineering S.p.A., Roma, Latium, Italy

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Publications (28)11.99 Total impact

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    ABSTRACT: The paper describes an optimized solution for the a Galileo Pseudolite based on a Transceiver consisting in the integration of a very accurate dual carrier (programmable E1-E6 or E1-E5) GALILEO Signal In Space Generator and a matched dual carrier GALILEO precision Time Receiver in a very compact (16 mm by 10 mm) state of art Software Radio Hardware platform. This solution simplifies the synchronization of the pseudolite to a system time without the necessity to foresee the presence of dedicate infrastructure such as reference station.
    Satellite Telecommunications (ESTEL), 2012 IEEE First AESS European Conference on; 01/2012
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    ABSTRACT: The paper describes the integration phase of the ALPHASAT Technology Demonstration Payload #5 (TDP#5) Mission Segment that, in conjunction with the TDP#5 payload, embarked in the Alphasat Satellite will allow the execution of communication experiments at Q and V frequency bands, and propagation experiments at Q and Ka bands. The TDP5#5 Mission Segment (TDP#5-MS) major constituents are two Italian Grounds Stations and three different control centres, one for the mission and two dedicated to each of the above mentioned experiments. Furthermore, the TDP#5-MS has been conceived in order to operate also with a third foreign Ground Station located in Austria at the Joannehum Research Institute.
    Satellite Telecommunications (ESTEL), 2012 IEEE First AESS European Conference on; 01/2012
  • Beyond Ka-Band: Meeting the Communication Bandwidth Requirements of the Future, IET Seminar on; 01/2011
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    ABSTRACT: Broadband technologies are taking a predominant role in the emerging information society. In particular, broadband satellite communication systems, with their global access and broadcasting capabilities, are well suited to answer to the requirements of the information society. This paper focuses on the efforts that are currently spent toward the development of EHF (Extremely High Frequency) satellite communications systems. In particular, Q/V (35-75 GHz) and W (75-110 GHz) bands, represent an almost ldquofreerdquo spectrum resource that could be used to realize the so-called satellite gigabit-connectivity, in order to support innovative broadband applications. This paper presents the most important features of an experimental Q/V band satellite network based on the Alphasat TDP#5 (technology demonstration payload), an ongoing project, funded by the Italian space agency, that aims at carrying out communication and propagation experiments over a Q/V band satellite link.
    Aerospace conference, 2009 IEEE; 04/2009
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    ABSTRACT: Q/V band frequencies are expected to play a key role in enabling challenging and unproven broadband communications missions for a wide range of applications. In the perspective to exploit these frequencies, several satellite missions have been proposed to explore the physics of the satellite channel. The strategic importance of probing higher and higher frequencies has been recognized by the Italian Space Agency through the ITALSAT mission that up to date has been the major contributor to the advancement of the Q/V band propagation knowledge. In 2004 ASI funded a feasibility study (phase A study), called TRANSPONDERS, Italian acronym for "research, analysis and study of Q/V payloads for telecommunications", whose main objectives were the improvement of the knowledge of propagation impairments at Q/V band and the evaluation of the effectiveness of PIMTs (Propagation Impairment Mitigation Techniques) in very high frequency band operation. In this paper, after an overview of the potential applications in Q/V band and the top level mission architecture relative to the selected applicative mission at these frequencies, the applicability of three selected PIMTs, such as site diversity, power control and Adaptive Coding and Modulation (ACM), in a Q/V band scenario is discussed and main challenges and key issues are identified.
    GLOBECOM Workshops, 2008 IEEE; 01/2009
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    ABSTRACT: A key requirement for the future multi-beam broadband satellite design is the provision of flexibility to adapt to different traffic demands by re-assigning capacity to beams in accordance with changing traffic distributions. Such flexibility would enable the best match to be maintained between the system resources and traffic demands over the satellite lifetime, thereby greatly enhancing the system utilisation and competitiveness. The current paper examines the use of beam hopping to provide such flexibility. It investigates the advantages of beam hopping and compares the performance and capacity capabilities of a beam hopped with that of equivalent non-hopped systems also designed to provide flexibility.
    Proceedings of the AIAA. 01/2009;
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    ABSTRACT: Since the 70s Italy has had a pioneering approach to higher frequencies, at first at Ka band (20/30 GHz) with the Sirio experience (launched in 1978), when such a range was still a frontier, and then with Italsat F1 and F2 experiments in the 90s, studying Q and V bands in addition to Ka one as well. After those experiences, Italy through the Italian space agency (ASI) was one of the first European countries that have made an effort toward the exploitation of Q/V band in telecommunications. In 2004 ASI funded a feasibility study (phase A), called TRANSPONDERS, Italian acronym for ldquoresearch, analysis and study of Q/V payloads for telecommunicationsrdquo, aimed at studying and designing a payload to be used to fully characterize the channel at Q/V bands and to test novel adaptive interference/fading mitigation techniques such as ACM (adaptive coding and modulation). Finally, the feasibility and performance of preliminary broadband services in such frequencies can be verified through this study. A new phase has recently started (April 2008), called TRANSPONDERS-2 and leaded by Space Engineering S.p.A., to continue the achievements gained during the first phase. In this scenario, it is mandatory to identify pre-operative experimental missions aiming at fully verifying the feasibility of future Q/V bands satellite telecommunication applications. The experimental goals are mainly to test the effectiveness of propagation impairment mitigation techniques (PIMTs) in such frequency bands and the minimization of implementation risks for operative system characterized by a series of technological challenges.
    01/2009;
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    01/2009;
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    ABSTRACT: The state of art of GALILEO Signal In Space specifications has been implemented by Space Engineering GALILEO Simulator. The design and quality test results of this Professional Instrument, aimed to support GALILEO receiver development, will be described in this Paper. The current version is compatible with SIS ICD vers. 12.0, but would allow easy migration to MBOC for L1 carrier, when this specification will be formalized by a new SIS ICD release. For what concern the E5 signal the Simulator is a truly Alt-BOC coherent generator allowing a 120MHz analog Bandwidth being generated digitally and not as two separate E5a and E5b analog signals. The current version of Space Engineering Signal In Space Simulator allow to generate up to four Satellites for all the three carriers L1, E5 and E6 simultaneously and it is a self contained unit, complete of AC power supplying adapter and fan cooling system, arranged in a single Compact-PCI (C-PCI)19" Rack.
    08/2008;
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    ABSTRACT: This paper complements its companion paper by reporting the key experimental results obtained both in the laboratory and via satellite, using the Satellite Universal Mobile Telecommunication Systems (S-UMTS) Advanced TestBed (ATB) - a comprehensive facility developed under a European Space Agency contract whose intention was to demonstrate a set of technical solutions for the efficient provision of the so-called S-UMTS services, i.e., third-generation (3G) point-to-point (i.e., interactive) and point-to-multipoint (i.e., multicasting/broadcasting) mobile services based on wideband code-division multiple access (W-CDMA). After addressing the architecture of the overall via satellite ATB demonstrator, the main test results obtained in the laboratory, as well as over the air, are summarized. Then, bit error rate and frame error rate measurement results that were taken from the forward and return links are shown for both the additive white Gaussian noise and the Ricean channels, with different orders of space diversity and different coding schemes, which were classified as either convolutional or turbo 3G partnership project coding. Finally, key results of via satellite L-band measurements are reported for both unicast and reliable multicast applications. Because of the extensive test campaign presented in this paper, the viability of adapting W-CDMA to support point-to-point (packet) and point-to-multipoint multicast services in the satellite environment, as standardized by the European Telecommunications Standards Institute, has been widely validated and experimentally confirmed. Reliable multicast techniques, exploiting a forward error correction that operates at the upper layer, were shown to be a powerful way of counteracting satellite channel impairments, thus allowing the multicast of multimedia contents in quasi-real time with good quality of service.
    IEEE Transactions on Vehicular Technology 04/2008; · 2.06 Impact Factor
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    ABSTRACT: This paper provides an overview of the advanced S-UMTS testbed (ATB; S-UMTS = satellite universal mobile telecommunication system) project that is funded by the European Space Agency, which was instrumental to define, validate, and demonstrate the adaptations of third-generation (3G) mobile technologies based on wideband code-division multiple access (W-CDMA) for supporting via-satellite services. Such services are often generically referred to as S-UMTS. One of the main project targets was to develop and demonstrate, in the laboratory and over the air, a set of technical solutions for the efficient provision of point-to-point (PTP, i.e., interactive) and point-to-multipoint (PTM, i.e., multicasting/broadcasting) services to best exploit the precious satellite communications resources. With respect to previous work, which was mostly devoted to the connection-oriented mode (i.e., circuit basis), particular emphasis was dedicated to optimizing solutions for the connectionless modes (i.e., packet basis and reliable multicasting/broadcasting, both real time and nonreal time). As a matter of fact, the wide-area delivery of multimedia services to mobile users is expected to represent the most important commercial opportunity for S-UMTS systems, as witnessed by recent initiatives taking place in the United States, Korea, and Japan. After dwelling on the aims of the ATB project, this paper presents the key required adaptations and extensions, for satellite applications, to the W-CDMA scheme as standardized by the Third Generation Partnership Project for terrestrial applications. This paper then continues by describing the architecture of the real-time end-to-end testbed (taking the name ATB after the project name), which was developed with the main objective of supporting laboratory and over-the-air trials, and its main constituting elements. In a companion paper, the architecture of the overall via-satellite demonstrator, which is largely based on the ATB, is addressed, to- - gether with the key results of the laboratory and over-the-air trials.
    IEEE Transactions on Vehicular Technology 02/2008; · 2.06 Impact Factor
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    ABSTRACT: The work associated to this article is a study initiative sponsored by ESA/ESTEC that responds to the crucial need of developing new Satellite payload aimed at making rapid progresses in handling large amounts of data at a competitive price with respect to terrestrial one in the telecommunication field. Considering the quite limited band allowed to space communications at Ka band, reusing the same band in a large number of beams is mandatory: therefore beam-forming is the right technological answer. Technological progresses - mainly in the digital domain - also help greatly in increasing the satellite capacity. Next Satellite payload target are set in throughput range of 50Gbps. Despite the fact that the implementation of a wideband transparent processor for a high capacity communication payload is a very challenging task, Space Engineering team in the frame of this ESA study proposed an intermediate step of development for a scalable unit able to demonstrate both the capacity and flexibility objectives for different type of Wideband Beamforming antennas designs. To this aim the article describes the features of Wideband HW (analog and digital) platform purposely developed by Space Engineering in the frame of this ESA/ESTEC contract ("WDBFN" contract) with some preliminary system test results. The same platform and part of the associated SW will be used in the development and demonstration of the real payload digital front end Mux and Demux algorithms as well as the Beam Forming and on Board channel switching in frequency domain. At the time of this article writing, despite new FPGA and new ADC and DAC converters have become available as choices for wideband system implementation, the two HW platforms developed by Space Engineering, namely WDBFN ADC and DAC Boards, represent still the most performing units in terms of analog bandwidth, processing capability (in terms of FPGA module density), SERDES (SERiliazer DESerializers) external links density, integration form factor (6U C-PCI) and modularity (they are both rack mounted boards).
    DASIA 2008 Data Systems In Aerospace; 01/2008
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    G. Gallinaro, R. Rinaldo, A. Vernucci
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    ABSTRACT: The Carrier Pairing technique, i.e. the sharing of the same frequency band for both Forward Link and Reverse Link carriers in a star or multi-star satellite network, is here discussed. In particular a possible mechanization and its performance in a realistic reference scenario are discussed to understand the merits and limitations of that technique. The analyses herein presented were carried out with regard to a reference scenario featuring a single Hub station per spot transmitting a standard DVB-S2 carrier with Adaptive Coding and Modulation (ACM) to User Terminals, which in turn transmit enhanced DVB-RCS signals (Turbo-Φ code, QPSK-16APSK ACM) to the Hub. Impairments caused by the non-linear satellite channel on echo canceller performance have been taken into account, also attempting to mitigate them by means of pre-distortion techniques.
    12/2007: pages 535-552;
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    ABSTRACT: The paper summarizes the baselines of a new satellite payload for radiowave propagation measurements in the Ka and Q/V bands which is being developed by the European Space Agency for the ESA Alphasat mission with the full support of the Italian Space Agency (ASI). The radiowave propagation experiment will be based on a geostationary satellite and will allow collecting a set of multiple simultaneous attenuation and depolarization measurements during a period of at least 3 years (with a possible extension up to 5 years) in many locations spread across a large area. This experiment represents a natural continuation of the European commitment on the characterisation of the Ka and Q/V band demonstrated during the recent period by the development of ESA OLYMPUS, ASI ITALSAT and CNES STENTOR satellites. The baseline design foresees a transmit-only payload radiating stable Ka and Q band coherent beacon signals from a geostationary platform. It is foreseen that the coverage area will be at least continental Europe with the possibility of a global coverage being considered; the polarization will be circular in order to ease depolarization measurements where possible and the reception shall be possible with antennas with diameter of the order of one meter.
    Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on; 12/2007
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    ABSTRACT: Point-to-point multibeam satellite systems based on the DVB-S standard are currently designed for link closure in the worst-case propagation and location conditions. The DVB-S standard, conceived for broadcasting applications, considers a fixed coding rate and modulation format that are selected according to the assumed coverage and availability requirements. This approach implies the occurrence of high margins in the majority of the cases, when interference and propagation conditions allow for higher signal-to-noise-plus-interference ratio. The adaptive coding and modulation (ACM) introduction in the new DVB-S2 standard for the interactive service profile opens up a number of appealing opportunities for the design and development of satellite broadband networks. In this article we show how the ACM introduction in the satellite downlink enables greatly enhanced system performance but also has a profound impact on the way the system and some of the key system components are designed.
    IEEE Wireless Communications 09/2007; · 3.74 Impact Factor
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    ABSTRACT: A comparative analysis between frequency scanning and multispot satellite systems has been performed in the context of land mobile applications. The aim of the work has been to confirm the effectiveness of the frequency scanning approach, whose technical feasibility has already been proved by the authors in a previous study, also in a comparative investigation with a more conventional satellite configuration.A proper comparative methodology has been established to compare two baseline configurations of the two systems. The analysis has also been rendered parametric, varying some system characteristics such as bandwidth, traffic distributions and linearity requirement. The achieved results are provided and widely commented on in the paper.
    International Journal of Satellite Communications 03/2007; 13(2):85 - 104.
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    ABSTRACT: This paper describes the Advanced S-UMTS Test Bed, shortly ATB, a project funded by the European Space Agency (ESA) with the main aim of studying, proposing and assessing solutions in support of packet-access and multicasting, in the context of a wideband system representative of the satellite component (S-UMTS) of 3G mobile networks. After presenting the general aim of ATB, this paper illustrates some results of the computer simulations carried out during Phase-1 of the project with the aim to assess the approaches proposed to most efficiently exploit the available Forward-Link (FL) and Reverse-Link (RL) resources, under the expected traffic scenarios. The paper then continues by presenting the implementation activities that are being performed within ATB Phase 2, which will lead to the realization of an endto -end hardware Test Bed to be used for experimenting the packet-access and the multicast mode both in the laboratory and over-the-air, in the context of a wideband satellite mobile services demonstration to the public. The ATB Test Bed architecture, main characteristics and trials plan are herein presented.
    IEEE Transactions on Vehicular Technology 05/2003; · 2.06 Impact Factor
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    ABSTRACT: This paper describes the main aspects relevant to the development of a third-generation radio transmission technology (RTT) concept identified as satellite wide-band CDMA (SW-CDMA), which has been accepted by the International Telecommunications Union (ITU) as one of the possible RTTs for the satellite component of International Mobile Telecommunications-2000 (IMT-2000). The main outcomes of the extensive system engineering effort that has led to the above ITU RTT are described. In particular, we address propagation channel characteristics, satellite diversity, power control, pilot channel, code acquisition, digital modulation and spreading format, interference mitigation, and resource allocation. Due to its similarity with respect to the terrestrial W-CDMA proposal from which it is derived, the SW-CDMA open air interface solution is described briefly, with emphasis only on the major adaptation required to best cope with the satellite environment. Quantitative results concerning the physical-layer performance over realistic channel conditions, for both forward and reverse link, are reported. A system capacity study case for a low-Earth-orbit constellation is also provided
    IEEE Transactions on Vehicular Technology 03/2002; 51(2):306 - 331. · 2.06 Impact Factor
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    ABSTRACT: This paper describes the Advanced S-UMTS Test Bed, shortly ATB, a project funded by the European Space Agency (ESA) with the main aim of studying, proposing and assessing solu- tions in support of packet-access and multicasting, in the context of a wideband system repre- sentative of the satellite component (S-UMTS) of 3G mobile networks. After presenting the general aim of ATB, this paper illustrates some results of the computer simulations carried out during Phase-1 of the project with the aim to assess the approaches proposed to most effi- ciently exploit the available Forward-Link (FL) and Reverse-Link (RL) resources, under the expected traffic scenarios. The paper then continues by presenting the implementation activi- ties that are being performed within ATB Phase 2, which will lead to the realization of an end- to-end hardware Test Bed to be used for experimenting the packet-access and the multicast mode both in the laboratory and over-the-air, in the context of a wideband satellite mobile services demonstration to the public. The ATB Test Bed architecture, main characteristics and trials plan are herein presented.
    01/2002; EMPS.
  • International Mobile Satellite Conference 1999, IMSC 99, Ottawa, Ontario, Canada; 06/1999