A. Vernucci

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

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Publications (31)11.81 Total impact

  • [Show abstract] [Hide abstract]
    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
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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
  • 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.
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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.
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    ABSTRACT: This paper deals with the digital video broadcasting- satellited (DVB-S2) test bed (called the DTB) implemented by space engineering in the context of the ESA ARTES-4 DEDICATION project. After illustrating the general scopes of the project, the paper begins with a description of the overall architecture of the DTB, which comprises a physical-layer (modem + codec) compliant with the DVB-S2 standard and operating in fully dynamic adaptive coding & modulation (ACM) mode, as well as the upper layers, i.e. those functionalities, such as generic stream (GS) encapsulation [5]of IP packets and physical-layer ACM management, that are needed to make the DTB fully representative of a real DVB-S2 forward-link (FL), with an IP-level interface to the external world. In addition to hub and user terminal DVB-S2 equipments, the DTB also features comprehensive testing facilities for FL performance assessment, while the return-link is emulated by an Ethernet link. The paper then illustrates the DTB implementation aspects, separately addressing the modem, the codec, the encapsulator, the satellite channel emulator and a traffic emulator, which permits to verify the equipment behaviour in an emulated operational environment, taking into account the effects of all relevant elements present in the chain. The overall hardware implementation is then presented together with the test measurement results. The tests included specific performance results for the individual blocks and a verification of some Internet services in presence of the typical channel effects. (9 pages)
    27th IET and AIAA International Communications Satellite Systems Conference (ICSSC 2009); 01/2009
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    ABSTRACT: In this paper we describe possible application scenarios for future broadband satcom networks, together with the associated key challenges as well as critical techniques and technologies which in the authors' opinion show enough potential to justify their development in the coming years. This Part I paper is focusing on broadband fixed networks and is complemented by Part II dedicated to mobile networks. (10 pages)
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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: 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; 14(4-14):61 - 69. DOI:10.1109/MWC.2007.4300985 · 6.52 Impact Factor
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    Gennaro Gallinaro, Alfredo Vernucci, Rita Rinaldo
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    ABSTRACT: In this paper an assessment of the effectiveness of Turbo-Interference Cancellation (Turbo-IC) for improving the spectral efficiency of a TDMA based satellite Return Link channel will be addressed. Interference mitigation algorithms have been widely studied and implemented in terrestrial wireless CDMA systems. In the present paper Turbo-IC is instead adopted for reducing the carrier spacing on the satellite return channel, thus allowing to increase the system throughput for a given system bandwidth. Performance results show that a throughput improvement up to 60% is achievable thanks to a better utilization of the available bandwidth. It shall be noted that such a major boost in system capacity is achieved without any complexity increase at the Satellite Terminal (ST), as the additional signal processing required is entirely located at the Gateway. Moreover, the proposed technique is fully compatible with DVB-RCS standard, which allows for applicability in current RCS VSAT systems. In the paper, extensive simulation results obtained in a realistic broadband satellite system scenario are shown and discussed.
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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; · 2.64 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. DOI:10.1109/25.994808 · 2.64 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
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    ABSTRACT: The European Telecommunication Standards Institute (ETSI) decision to endorse for the Universal Telecommunication Radio Access (UTRA) techniques based upon wideband CDMA approaches for terrestrial UMTS (T-UMTS) paired frequency duplexing band will certainly constitute an important driver to steer the corresponding choice for the satellite UMTS (S-UMTS) component. In this paper it is shown how a similarity in the S-UMTS access solution not only contributes to making dual-mode user-terminals more cost-effective but also represents a good technical choice. This is despite the fact that the satellite UMTS component faces a number of unique challenging requirements, such as very scarce RF power resources compared to T-UMTS, significant propagation delay, high frequency variations due to Doppler shift (especially for the low-altitude Earth orbit (LEO) case), larger cell size. This paper described the main ETSI UTRA modifications required to obtain an efficient S-UMTS air interface capable of suiting the above listed constraints, while keeping maximum commonality with the T-UMTS.
    Global Telecommunications Conference, 1999. GLOBECOM '99; 02/1999