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ESA has undertaken the development of the baseband laboratory prototype of an experimental on-board processing satellite system orientated to complement the TST/SS-TDMA prototype for a wide range of low rate services (e.g., vocoded voice,... more
ESA has undertaken the development of the baseband laboratory prototype of an experimental on-board processing satellite system orientated to complement the TST/SS-TDMA prototype for a wide range of low rate services (e.g., vocoded voice, low rate circuit switched data, packet data). The current prototype investigates a few basic techniques (such as synchronization, multiservice switching) which are primarily intended for mobile systems and can be extended to further applications (e.g., enhanced VSAT's). The baseline up-link includes a flexible mixture of SCPC and very low rate TDMA and the downlink is TDM, so that compatibility with ground cellular networks could be achieved eventually. These techniques are going to be validated by a comprehensive test-bed set-up and can evolve into field experiments.
Research Interests: Computer Science, Communication Networks, Mobile Systems, Satellite Communication, Field Experiment, and 10 moreCellular Network, Satellite, Transmission lines, Community Networks, Transmission Line, Mobile Communication System, Test Bed, Performance Test, Central Processing Unit, and Circuit Switched
In this paper, we investigate the performance of a generic filterbank transceiver in the presence of a carrier frequency offset. We propose a theoretical model to compute the error probability in the case of a generic frequency-selective... more
In this paper, we investigate the performance of a generic filterbank transceiver in the presence of a carrier frequency offset. We propose a theoretical model to compute the error probability in the case of a generic frequency-selective channel. Moreover, the proposed method is also extended to deal with nonuniform, i.e., wavelet, transceivers. The accuracy of the model is evaluated by means of computer simulations, using several types of filterbank transceivers. Systems based on cyclic prefix (CP) and zero padding (ZP) are considered to avoid interblock interference (IBI) in frequency-selective channels. The analytical results obtained with the proposed method allow us to quickly compare different systems, characterized by a different filterbank selectivity, as well as by different methods to combat IBI (ZP or CP).
Research Interests: Electronic Engineering, Computer Science, Wireless Communications, Computer Simulation, Wavelet Transforms, and 9 moreFrequency offset, Filter Bank, Theoretical Model, Electrical And Electronic Engineering, Symbol Error Probability, Cyclic Prefix, Zero Padding, Transceivers, and frequency selective channel
Information Technologies of interest for Culture Heritage are presented: multimedia systems, data-bases, data protection, access to digital content, Virtual Galleries. Particular reference is reserved to digital images (Electronic Imaging... more
Information Technologies of interest for Culture Heritage are presented: multimedia systems, data-bases, data protection, access to digital content, Virtual Galleries. Particular reference is reserved to digital images (Electronic Imaging & the Visual Arts), regarding Cultural Institutions (Museums, Libraries, Palace - Monuments, Archaeological Sites). The International Conference includes the following Sessions: Strategic Issues; New Science and Culture Developments & Applications; New Technical Developments and Applications; Museums - Virtual Galleries and Related Initiatives; Access to the Culture Information. An International Forum on “Culture & Technology” is enclosed. One Workshop regards: Innovation and Enterprise.
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Research Interests: Computer Science and IEEE
Research Interests: Computer Science, Biomedical Engineering, Queueing theory, Computer Network, Computer Simulation, and 9 morePerformance Prediction, TDMA (Time division multiple access), Random Access, Wireless Control Network, Electrical And Electronic Engineering, Satellite Network, Channel Capacity, Time lag, and Slotted Aloha
This paper deals with a turbo multiuser detector suitable for applications in overloaded coded DS-CDMA systems. The turbo-MUD receiver is based on the use of a linear MMSE detector in the first iteration and a parallel interference... more
This paper deals with a turbo multiuser detector suitable for applications in overloaded coded DS-CDMA systems. The turbo-MUD receiver is based on the use of a linear MMSE detector in the first iteration and a parallel interference cancellation scheme in the successive ones. The inputs of the interference cancellator are both the detector outputs and the soft information from a bank of turbo decoders. The performance of the proposed receiver has been derived by means of computer simulations and applications of the density evolution theory: in particular, this technique permits to properly evaluate the number of MMSE iterations, simplifying the overall receiver design.
Research Interests: Distributed Computing, Signal Processing, Iterative Methods, Parallel Processing, Computer Simulation, and 12 moreMean square error, Noise reduction, Detectors, Spread Spectrum Communication, Signal Detection, Interference Cancellation, Turbo Codes, Code Division Multiple Access, Electrical And Electronic Engineering, Iterative Detection, turbo decoding, and Iterative Method
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Research Interests: Computer Science, Signal Processing, Modeling, Modulation, Multidisciplinary, and 15 moreDifferential Equations, System Design, Design Methodology, Transfer Function, Prototypes, Linear Systems, Filter Bank, FIR filters, Frequency Response, Amplitude Modulation, Prototype, Finite Impulse Response Filter, Infinite Impulse Response Filter, Infinite Impulse Response, and IIR Filter
... Hence, we have the following flow balance equation: ... an adjacent cell ; there is an area where this MS can receive a signal with an acceptable power level from ... Let us assume that, due tobeam-forming, spot-beam foot-prints are... more
... Hence, we have the following flow balance equation: ... an adjacent cell ; there is an area where this MS can receive a signal with an acceptable power level from ... Let us assume that, due tobeam-forming, spot-beam foot-prints are disposed on the earth according to a hexagonal ...
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The authors deal with an efficient high-speed packet switching fabric suitable for applications in future high speed networks. An advanced implementation architecture based on shared buffers at each input is studied. An important result... more
The authors deal with an efficient high-speed packet switching fabric suitable for applications in future high speed networks. An advanced implementation architecture based on shared buffers at each input is studied. An important result is that the proposed switching fabric achieves optimum throughput-mean switching delay performance jointly with reduced buffering requirements and without having to resort to a faster switching fabric.
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The definition of an integrated satellite/terrestrial mobile system is under study worldwide; an interesting approach proposed to meet the UMTS requirements is that which considers a smooth migration from current second generation systems... more
The definition of an integrated satellite/terrestrial mobile system is under study worldwide; an interesting approach proposed to meet the UMTS requirements is that which considers a smooth migration from current second generation systems towards future generation ones (i.e., UMTS, MBS). COST 252 Action starting from the results achieved within COST 227 Action and the related RACE II projects (e.g., MONET, SAINT and MBS) investigates the feasibility of such an evolutionary approach and contributes to the standardization phase of future generation systems.
Research Interests: Standardization and UMTS
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Abstract A multicarrier demodulator (MCD) suitable for advanced satellite digital communications is presented. This system permits the direct onboard interface of frequency-division and time-division multiple-access communication links by... more
Abstract A multicarrier demodulator (MCD) suitable for advanced satellite digital communications is presented. This system permits the direct onboard interface of frequency-division and time-division multiple-access communication links by using digital signal ...
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Research Interests: Signal Processing, Computational Complexity, Communication System, Antenna arrays, UMTS, and 15 morePerformance Evaluation, Computer Simulation, Broadband Networks, Space Time, Detectors, Bit error probability, Spread Spectrum Communication, Signal Detection, Antenna Array, Interference Cancellation, Code Division Multiple Access, Base station, Fading channels, Low Complexity, and Processing delay
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The structure and performance of an integrated system for all mobile communications, based on the Pan European digital cellular network standard, are presented. The system architecture and protocols are discussed. A performance analysis... more
The structure and performance of an integrated system for all mobile communications, based on the Pan European digital cellular network standard, are presented. The system architecture and protocols are discussed. A performance analysis of the satellite access procedure is given. Also, the performance of a satellite system integrated with the terrestrial network is considered, referring to the present bandwidth allocation
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The aim of this paper is to present a suitable satellite multimedia network architecture and the results of simulated medium access control (MAC) protocols. The new generation of satellite multimedia networks is going to handle different... more
The aim of this paper is to present a suitable satellite multimedia network architecture and the results of simulated medium access control (MAC) protocols. The new generation of satellite multimedia networks is going to handle different types of traffic such as multimedia traffic. The ATM technology was developed for the integrated transmission of various types of traffic. The future networks protocols should be as much as possible compatible and that is one of the main reasons to think about the use of ATM technology for transmission over satellites. Satellite networks present a lot of challenges related to quality of services (QoS) provision and the medium access control access protocols are strongly related to QoS provision.
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This paper deals with a radio‐based communication network with a single radio channel shared by several data terminals for transmissions to a single hub station. In particular, the communication system considered is a potential provider... more
This paper deals with a radio‐based communication network with a single radio channel shared by several data terminals for transmissions to a single hub station. In particular, the communication system considered is a potential provider of wireless LAN‐like services. The focus is on the capacity of combining a preemptive polling‐based multiple access scheme with a Selective Repeat ARQ technique to counteract the effect of the nonstationary transmission channel. The nonstationary transmission channel has been modeled as a two‐state Markov chain with parameters related to actual propagation conditions. Typical outdoor/indoor environments have been considered. The main idea is that of making the service interruption of the preemptive polling scheme dependent on the propagation conditions of the transmission channel by monitoring the outcome of the data packet transmission attempts. A performance comparison clearly reveals the superiority of this preemptive polling scheme with respect to the classical cyclic polling scheme.
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ABSTRACT From the communication channel and implementation aspects of communications, the transmission environment may be sufficiently degraded that introduces practical difficulties in acquiring and tracking a coherent demodulation... more
ABSTRACT From the communication channel and implementation aspects of communications, the transmission environment may be sufficiently degraded that introduces practical difficulties in acquiring and tracking a coherent demodulation reference signal. Coherent receivers require exact knowledge of the channel phase for optimum performance. Due to the difficult task of estimating the channel phase, non-coherent as well as differential detection is an attractive alternative to coherent detection. A conventional differential detector uses the signal received in the previous symbol interval as a phase reference for the received signal in the current interval. As long as the phase distortion introduced by channel varies slowly relative to the symbol rate, conventional differential detection will work quite well. This assumption is not always true, and, in addition, differentially coherent detection is based on the premise that there is no intersymbol interference (ISI) in the received signal. In this paper we present a new modulation technique which allows to transmit coherent secure symbols and demodulate them incoherently. The main advantages is the use of simpler receiver while still having information carried by the phase of the radio signal. In practise, an incoherent detector can be used, while having optimum performance as a coherent detector. No reference signal or symbol is needed to automatically compensate the total phase rotation at the receiver. It will be shown that the total phase rotation can be easily and accurately estimated (and compensated) at the receiver side, without relying on any phase reference from a transmitted pilot signal or from the received modulated signal.
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ABSTRACT A cooperative network can be modeled with a basic relay channel, composed by a couple of nodes - source and destination - and a third node called relay. The source broadcasts its communication to both the destination and the... more
ABSTRACT A cooperative network can be modeled with a basic relay channel, composed by a couple of nodes - source and destination - and a third node called relay. The source broadcasts its communication to both the destination and the relay. Therefore the relay transmits the same information to the destination, which combines the two signals received from both the source and the relay. This system allows to increase the range of the network and to achieve diversity at the destination even with single-antenna devices. This model can be extended to networks where multiple relays work in parallel. Recently a new power allocation algorithm was presented. The relay power algorithm (RPA) is robust against uncertainties in the channel state information (CSI). In this paper we extend the procedure to a network where relays transmit in a multiband channel.
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This paper deals with the introduction of two new schemes of space-time MMSE reception implemented for the forward link of a WCDMA multisatellite UMTS environment and the comparison with other two similar space-time MMSE receiver already... more
This paper deals with the introduction of two new schemes of space-time MMSE reception implemented for the forward link of a WCDMA multisatellite UMTS environment and the comparison with other two similar space-time MMSE receiver already presented in the literature. In all this works the so called space-time transmit diversity technique (STTD) has been coupled with the minimum mean square
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... Note that there are some cases in which the MT has to run only one auxiliary sub-procedure and other cases in which it has to run two auxiliary sub-procedures; the MT has to run auxiliary sub-procedures until it can ... [15] Decarli,... more
... Note that there are some cases in which the MT has to run only one auxiliary sub-procedure and other cases in which it has to run two auxiliary sub-procedures; the MT has to run auxiliary sub-procedures until it can ... [15] Decarli, Nicolo; Dardari, Davide; Gezici, Sinan; D'Amico ...
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ABSTRACT Due to the enormous spreading of applied wireless networks, security is actually one of the most important issues for telecommunications. One of the main issue in the field of securing wireless information exchanging is the... more
ABSTRACT Due to the enormous spreading of applied wireless networks, security is actually one of the most important issues for telecommunications. One of the main issue in the field of securing wireless information exchanging is the initial common knowledge between source and destination. A shared secret is normally mandatory in order to decide the encryption (algorithm or code or key) of the information stream. It is usual to exchange this common a priori knowledge by using a “secure” channel. A new modulation technique, able to encrypt the radio signal without any a priori common secret between the two nodes, was previously proposed by the authors [1]-[3]. The information is modulated, at physical layer, by the thermal noise experienced by the link between two terminals. A loop scheme is designed for unique recovering of mutual information. This contribution improves the previous works by exploring the real robustness of the proposed technique against the presence of DOS warriors and impairment of the radio channel, considering also implementation details, such as the bit integration time. Both the case of passive and active attacks have also been implemented and simulated by using the Matlab Simulink.
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ABSTRACT Due to the enormous spreading of applied wireless networks, security is actually one of the most important issues for telecommunications. One of the main issue in the field of securing wireless information exchanging is the... more
ABSTRACT Due to the enormous spreading of applied wireless networks, security is actually one of the most important issues for telecommunications. One of the main issue in the field of securing wireless information exchanging is the initial common knowledge between source and destination. A shared secret is normally mandatory in order to decide the encryption (algorithm or code or key) of the information stream. It is usual to exchange this common a priori knowledge by using a "secure" channel. Nowadays a secure wireless channel is not possible. In fact normally the common a priori knowledge is already established (but this is not secure) or by using a non-radio channel (that implies a waste of time and resource). This contribution deals with the proposal of a new modulation technique ensuring secure communication in a full wireless environment. The information is modulated, at physical layer, by the thermal noise experienced by the link between two terminals. A loop scheme is designed for unique recovering of mutual information. The probability of error/detection is analytically derived for the legal users and for the third unwanted listener. The proposed scheme has also been implemented in a Xilinx Virtex II FPGA. All the results show that the performance of the proposed scheme yields the advantage of intrinsic security, i.e., the mutual information cannot be physically demodulated (passive attack) or denied (active attack) by a third terminal, leading us to conclude that the proposed technique is really useful for private key distribution in every wireless network.
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This paper deals with a multiuser cancellation detector for DS-CDMA wireless communication systems. The proposed detector's main feature lies in the joint utilization of the space and time processing techniques since optimum... more
This paper deals with a multiuser cancellation detector for DS-CDMA wireless communication systems. The proposed detector's main feature lies in the joint utilization of the space and time processing techniques since optimum beamforming for adaptive antenna arrays and interference cancellation are supposed to be used together: in particular, different multiuser multisensor receiver architectures are considered and compared but only one
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In this paper an original detection strategy for Satellite Digital Broadcasting communications is definited: particularly, we consider the DVB-S2 system, which is proposed as a development of the DVB systems and exploits iterative... more
In this paper an original detection strategy for Satellite Digital Broadcasting communications is definited: particularly, we consider the DVB-S2 system, which is proposed as a development of the DVB systems and exploits iterative decoding and higher order modulation; these features allow the derivation of advanced detectors which are based on an iterative demapping and decoding approach. The adoption of this strategy approaches permits a remarkable performance gain and an improvement of the system throughput.
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ABSTRACT Because of the environmental policies that pursue a significant reduction of global greenhouse gas and to the ambition of the network operators to keep under control operational and maintenance expenditures, energy efficiency has... more
ABSTRACT Because of the environmental policies that pursue a significant reduction of global greenhouse gas and to the ambition of the network operators to keep under control operational and maintenance expenditures, energy efficiency has recently become one of the most relevant issues for present and future research activities. This contribution deals with the management of the base station sleep mode in a cellular network. The forecasting based sleep mode algorithm, justified by daily and weekly periodic behaviour of traffic, is presented and evaluated for general deployments of second and third generation cellular networks. The energy consumption of each base station and the area power consumption are the metrics, which are considered for our simulations. The results show a significant increase of the energy efficiency during low traffic periods with respect to the usual scenario, thanks to the adoption of the proposed strategy. The forecasting based sleep mode algorithm has been also compared with a strategy based on real-time measurements and the results show similar performances while the number of updates of the network configuration and the global complexity are decreased. Copyright © 2013 John Wiley & Sons, Ltd.
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ABSTRACT Nowadays, the pursuit of energy efficiency is one of the main challenges of present and future mobile communications. The growth of the mobile communication market which has been increased by the proliferation of smartphones and... more
ABSTRACT Nowadays, the pursuit of energy efficiency is one of the main challenges of present and future mobile communications. The growth of the mobile communication market which has been increased by the proliferation of smartphones and laptops and the rising of data traffic subscriptions claims for an improvement of network capacity and, consequently, of the infrastructure. In this scenario, in order to contain operative expenditures, the network operators must pay attention to energy saving strategies that may eventually also contribute to reduction of greenhouse emissions. In this paper, the exponential smoothing technique is applied to achieve a traffic forecast for all the coverage area, considering daily and weekly data communication trends: in particular, the base station transmission power can be adapted in order to save energy and guarantee the requested network capacity. Results show the effectiveness of traffic forecast technique for the prediction of the requested capacity and for the maximization of the energy efficiency, allowing performance very close to the optimum case.
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... User Space Terminals, as LEO (Low Earth Orbit) and MEO (Medium Earth Orbit) satellites but also launchers ... She was awarded the 1990 Piero Fanti International Prize and was nominated for the Harry M. Mimmo Award in 1996 and the... more
... User Space Terminals, as LEO (Low Earth Orbit) and MEO (Medium Earth Orbit) satellites but also launchers ... She was awarded the 1990 Piero Fanti International Prize and was nominated for the Harry M. Mimmo Award in 1996 and the Cristoforo Colombo Award in 2002. ...
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ABSTRACT The definition of LTE and LTE-Advanced standards aims at improving the performance of cellular networks with the final goal of a fair competition between wired and wireless communication systems. In order to guarantee excellent... more
ABSTRACT The definition of LTE and LTE-Advanced standards aims at improving the performance of cellular networks with the final goal of a fair competition between wired and wireless communication systems. In order to guarantee excellent performance, one of the crucial challenge to cope with is the introduction of advanced channel estimation techniques for Multiple Inputs Multiple Outputs (MIMO) systems. In this paper, we will review and compare several Pilot-Based Channel Estimation algorithms for MIMO LTE downlink communications. Channel estimation algorithms will be analysed for different multi-antenna schemes, namely 2×2 and 4×4 with Alamouti space-frequency coding. The performance of all of these schemes will be considered both for uncoded and coded systems. The simulation results will be obtained for a multipath fading channel, assuming high speed mobility for the mobile terminals.
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The objective of this paper is the derivation in a closed form of the channel estimation mean square error (MSE) expression in the time-frequency domain for OFDM systems, providing a general tool that can be applied to all linear channel... more
The objective of this paper is the derivation in a closed form of the channel estimation mean square error (MSE) expression in the time-frequency domain for OFDM systems, providing a general tool that can be applied to all linear channel estimation algorithms. The proposed method can be used to identify the best channel estimation algorithms, and to compare the different pilot symbol positioning strategies within an OFDM frame. Thanks to these features the proposed method can be used as a support to the system design.
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In the last years one of the main technological effort in satellite communications is the integration of digital broadcast services with two-way communications: this is justified by the research of new business perspective and in the... more
In the last years one of the main technological effort in satellite communications is the integration of digital broadcast services with two-way communications: this is justified by the research of new business perspective and in the increase of technological efficiency. Traditionally, common air interface (CAI) standards have been rigorously defined in great detail to ensure optimized operation for specific application and to permits the interoperability between the equipment of different manufactures devices. In this context, Software Radio is a possible technology that will facilitate the implementation of adaptive and flexible transmission schemes and protocols of the present and future standard of communications. A relevant element to the development of SR terminals is the remote configuration capability. It represents a complex tradeoff between two elements: the level of details in the description of radio components and the level of abstraction required for a hardware indepen...
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In this paper some simple cooperative relaying strategies which rely on the exploitation of the Delay Diversity technique and the Maximal Ratio Combining (MRC) receive diversity algorithm are proposed for a DVB-SH compliant hybrid... more
In this paper some simple cooperative relaying strategies which rely on the exploitation of the Delay Diversity technique and the Maximal Ratio Combining (MRC) receive diversity algorithm are proposed for a DVB-SH compliant hybrid satellite/terrestrial network. These strategies are investigated in a public emergency scenario where the adoption of an integrated heterogeneous network combined with the cooperative diversity techniques guarantees
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Research Interests: Distributed Computing, Smart Antenna, Reconfigurable Digital Systems, Digital Signal Processing, Software Defined Radio, and 15 moreMIMO Systems, BLAST, Software Radio, Iterative Receiver, Space Time coding, Smart Antennas, Spatial Filtering, Space vector modulation, Adaptive Beamforming, Signal to Noise Ratio, High Efficiency, Block Codes, Electrical And Electronic Engineering, Hardware architecture, and Direction of arrival
Research Interests: Computer Science, Distributed Computing, Modulation, Cognitive radio, Cognitive, and 12 moreWireless Network, Quality of Service, Physical Layer, Mutual Information, Spectrum, Wireless communication systems, Security Protocol, Wireless Communication, Electrical And Electronic Engineering, Cognitive Radio Network, Thermal Noise, and Wireless Personal Communications
Research Interests: Computer Science, Distributed Computing, Game Theory, Resource Allocation, Wireless networks, and 11 moreCognitive radio, Optimization, Optimization Problem, Wireless Network, Software Radio, Resource Management, Implementation, Spectral Efficiency, Electrical And Electronic Engineering, Cognitive Radio Network, and Wireless Personal Communications
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Research Interests: Distributed Computing, Signal Processing, Satellite Communications, Satellite Communication, Maximum Likelihood, and 8 moreSatellite, Data Processing, Signal to Noise Ratio, Clock & Data Recovery, Electrical And Electronic Engineering, Frequency Division Multiple Access, Digital filter, and Time division multiplex
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Research Interests: Engineering, Technology, Signal Processing, Computational Complexity, Communication System, and 15 moreAntenna arrays, UMTS, WCDMA, Performance Evaluation, Computer Simulation, Space Time, Detectors, Bit error probability, Interference, Antenna Array, Vehicular, Interference Cancellation, Code Division Multiple Access, Base station, and Fading channels
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Research Interests: Computational Complexity, Digital Signal Processing, Modulation, Multidisciplinary, Sampling methods, and 14 moreFIR filter, Spectrum, Prototypes, Filter Bank, Filtering, Digital Filters, Digital signal, Linear Phase, Signal Reconstruction, Transfer Functions, Finite Impulse Response (FIR), Finite Impulse Response Filter, Infinite Impulse Response, and IIR Filter
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AbstractThis paper deals with a variable rate discrete multitone modulation system for broadband power-line commu-nications, based on the bit-loading algorithm proposed by Leke and Cioffi. In the proposed system a suitable least mean... more
AbstractThis paper deals with a variable rate discrete multitone modulation system for broadband power-line commu-nications, based on the bit-loading algorithm proposed by Leke and Cioffi. In the proposed system a suitable least mean square channel estimator is ...
Research Interests: Engineering, Comparative Study, Power Line Communication, Learning, Channel Estimation, and 12 moreBroadband Networks, Fading, Bit Error Rate, Rate Adaptation, Least Mean Square, Discrete Time Control System, Gaussian noise, System performance, Network Model, Electrical And Electronic Engineering, Fading channels, and Multipath fading channels
Research Interests: Performance, Mobile Communication, Fading Channel, Algorithm, Estimation Theory, and 14 moreChannel Estimation, Noise, Fading, GSM, TDMA (Time division multiple access), Viterbi algorithm, Maximum Likelihood Estimation, Communication Channels, Doppler effect, Electrical And Electronic Engineering, Adaptive Algorithm, Euclidean Distance, Cellular system, and Fading channels
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In this brief, we propose a new method to design pseudo-QMF prototypes to implement near perfect reconstruction (NPR) modulated filter banks. The proposed method is based on the eigenfilter approach, simple to implement, but nevertheless,... more
In this brief, we propose a new method to design pseudo-QMF prototypes to implement near perfect reconstruction (NPR) modulated filter banks. The proposed method is based on the eigenfilter approach, simple to implement, but nevertheless, very efficient in designing high attenuation filters. The method also allows one to design complex coefficient prototypes that may be used to build nonuniform filter
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Research Interests: Computer Science, Distributed Computing, Packaging, Communication systems, Channel Coding, and 15 moreCommunication System, Air traffic control, Data Communication, Bit Error Rate, Communication Channels, Decoding, Computer Program, Digital Filter Design, Filtering, Digital Filters, Pulse Modulation, Block Codes, Electrical And Electronic Engineering, Data Transmission, and Digital filter
Research Interests: Computer Science, Distributed Computing, Resource Allocation, Queueing theory, Satellite Communications, and 15 moreProbability, Queuing Theory, IEEE, Cellular Networks, Cellular Network, Low Earth Orbit, Dynamic Channel Allocation, Performance Comparison, Cost Function, Electrical And Electronic Engineering, Satellite Network, Channel assignment, Frequency allocation, Fixed Channel Allocation, and Channel Allocation
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A new digital implementation of a receiver for digital communications is proposed. The key feature of the receiver structure is the close integration of the MAP carrier and clock synchronisation with the ML demodulation. It is shown that... more
A new digital implementation of a receiver for digital communications is proposed. The key feature of the receiver structure is the close integration of the MAP carrier and clock synchronisation with the ML demodulation. It is shown that the same hardware is able to perform both operations, thus substantially reducing the receiver implementation complexity.
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AbstractIn this paper we analyze the effect of the frequency selectivity and time variation of the wireless channel over Space Time Block Code (STBC)s in an Orthogonal Frequency Division Multiplexing (OFDM) system for a mobile User... more
AbstractIn this paper we analyze the effect of the frequency selectivity and time variation of the wireless channel over Space Time Block Code (STBC)s in an Orthogonal Frequency Division Multiplexing (OFDM) system for a mobile User Terminal (UT). In order to mitigate the ...
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Research Interests: Computer Science, Distributed Computing, Resource Allocation, Queueing theory, Satellite Communications, and 15 moreProbability, Queuing Theory, IEEE, Cellular Networks, Cellular Network, Low Earth Orbit, Dynamic Channel Allocation, Performance Comparison, Cost Function, Electrical And Electronic Engineering, Satellite Network, Channel assignment, Frequency allocation, Fixed Channel Allocation, and Channel Allocation
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Research Interests: Engineering, Computer Science, Technology, Queueing theory, Probability, and 12 morePerformance Analysis, UMTS, Satellite Communication, Satellite Networks, QoS, Quality of Service, Analytical Model, Vehicular, Mobiles and Satellite Systems, Low Earth Orbit, User Requirements, and Mobile Environment
IP satellite networks are gaining a considerable interest mainly due to their ability to deliver high bandwidth services to nation-wide areas. However some difficulties still exist to implement IP-based transport mechanisms on... more
IP satellite networks are gaining a considerable interest mainly due to their ability to deliver high bandwidth services to nation-wide areas. However some difficulties still exist to implement IP-based transport mechanisms on geostationary satellite networks (i.e. TCP-based protocols are affected by the large delay-bandwidth product). The satellite network architecture presented in this paper is designed to provide a complete QoS support for IP traffic based on the DS paradigm, while minimizing the waste of the valuable satellite resource. The proposed technique operates on two time scales: a short-term reaction compensates fast traffic variations by an appropriate scheduling while a medium term resource allocation mechanism reduces the wasted bandwidth. Copyright © 2003 John Wiley & Sons, Ltd.
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Research Interests: Computer Science, Image Processing, Pattern Recognition, Digital Signal Processing, Parallel Processing, and 8 moreNeural Network, Adaptive Filter, Viterbi algorithm, Digital Signal Processor, Hardware Implementation of Algorithms, Fault Tolerant, Channel Equalization, and Additive White Gaussian Noise
... in terms of BER (Bit Error Rate) as a function of ratio between the energy per bit at the receivingend (Eb) and No, threshold S, number of sensor. In Fig. ... two senson antenna - - - Slmulatlon resulu. tour senY)rs MlCnna 1 .OOE-01... more
... in terms of BER (Bit Error Rate) as a function of ratio between the energy per bit at the receivingend (Eb) and No, threshold S, number of sensor. In Fig. ... two senson antenna - - - Slmulatlon resulu. tour senY)rs MlCnna 1 .OOE-01 EER 1,OOE-02 1.00E-03 ...
Research Interests: Computer Science, Signal Processing, Applications, Sensor Arrays, Adaptive Signal Processing, and 15 moreCommunication System, Antenna arrays, Performance Analysis, Adaptive Antennas, BPSK, Fading, Space Time, Bit Error Rate, BER, Detectors, Rayleigh fading channel, Spread Spectrum Communication, Interference Cancellation, Code Division Multiple Access, and Low Complexity
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ABSTRACT The objective of the reduction of the energy consumption in the next years has led the scientific community to investigate the possible solution to be adopted in the cellular networks: therefore, a huge attention is currently... more
ABSTRACT The objective of the reduction of the energy consumption in the next years has led the scientific community to investigate the possible solution to be adopted in the cellular networks: therefore, a huge attention is currently dedicated to the green radio techniques since even the future business models of the mobile telecom operators will be deeply influenced by the trends which will be chosen today. In this paper, two adaptive algorithms which are based on traffic forecast and real-time measurements are proposed and compared with the goal of the optimal radio resources management.
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Page 1. Kybernetika Fiorella Argenti; A. De Angeli; E. Del Re; Roberto Genesio; Plinio Pagni; Alberto Tesi Secure communications based on discrete time chaotic systems Kybernetika, Vol. ... [10] LM Pecora and TL Carroll: Synchronization... more
Page 1. Kybernetika Fiorella Argenti; A. De Angeli; E. Del Re; Roberto Genesio; Plinio Pagni; Alberto Tesi Secure communications based on discrete time chaotic systems Kybernetika, Vol. ... [10] LM Pecora and TL Carroll: Synchronization in chaotic systems. Phys. Rev. Lett. ...
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ABSTRACT This paper deals with a multiuser detector for DS-CDMA wireless communication systems. The proposed detector's main feature lies in the joint utilization of the space and time processing techniques since adaptive antenna... more
ABSTRACT This paper deals with a multiuser detector for DS-CDMA wireless communication systems. The proposed detector's main feature lies in the joint utilization of the space and time processing techniques since adaptive antenna arrays and decorrelating multiuser receiver are supposed to be used together. The complexity growth is lowered by implementing a multiuser detection technique based on the sliding window algorithm. The DS-CDMA communication system considered resorts to QPSK modulated wideband signals so that a sliding window algorithm generalization is necessary. The simulation results shown here confirm that the proposed structure is near-far resistant even in the worst fading cases. As the sensor number increases a remarkable performance improvement takes place. Besides we show that the proposed receiver allows systems to exploit completely the array introduction while maintaining an acceptable computational complexity
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Research Interests: Game Theory, Cognitive Radio Networks, Communication systems, Resource Allocation, Wireless networks, and 11 moreCognitive radio, OFDM, Satellite Communication, Wireless Network, Power Control, Frequency, Resource Management, Power allocation, Spectrum, Cognitive Radio Network, and Satellite Network
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Due to the enormous spreading of applied wireless networks, security is actually one of the most important issues for telecommunications. One of the main issue in the field of securing wireless information exchanging is the initial common... more
Due to the enormous spreading of applied wireless networks, security is actually one of the most important issues for telecommunications. One of the main issue in the field of securing wireless information exchanging is the initial common knowledge between source and destination. A shared secret is normally mandatory in order to decide the encryption (algorithm or code or key) of the information stream. It is usual to exchange this common a priori knowledge by using a "secure" channel. Nowadays a secure wireless channel is not possible. In fact normally the common a priori knowledge is already established (but this is not secure) or by using a non-radio channel (that implies a waste of time and resource). The information is encrypted by means of a private key that must be known by both the transmitter and the receiver. One of the main weak point about security is the private key exchanging interval. The key cannot be public and cannot be known a priori. The problem is how ...
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Direct reception of DVB-S (2) satellite signals from mobile terminals equipped with non directive antennas is becoming of great interest among manufacturers and operators. Low orbit constellations are technically preferred for mobile... more
Direct reception of DVB-S (2) satellite signals from mobile terminals equipped with non directive antennas is becoming of great interest among manufacturers and operators. Low orbit constellations are technically preferred for mobile terminal reception due to the ...
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Secure transmission of information is an important aspect of modern telecommunication systems. Data encryption is applied in several contexts, whenever privacy is a fundamental aspect, e.g., in modern mobile networks. In this work, a... more
Secure transmission of information is an important aspect of modern telecommunication systems. Data encryption is applied in several contexts, whenever privacy is a fundamental aspect, e.g., in modern mobile networks. In this work, a stream cipher based on discrete time nonlinear dynamic systems is proposed. The Henon's map is used to generate a chaotic signal. Its samples are quantized and processed to produce a sequence of data as much uncorrelated as possible. The proposed scheme demonstrates high sensitivity to the parameters of the map as well as to initial conditions. The resulting binary sequence is used to mask the stream of information bits.
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ABSTRACT The RRM strategies and the deployment guidelines to be adopted in a multi-layer heterogeneous mobile network with the goal of the optimization of the Area Power Consumption are presented in this paper: in the considered... more
ABSTRACT The RRM strategies and the deployment guidelines to be adopted in a multi-layer heterogeneous mobile network with the goal of the optimization of the Area Power Consumption are presented in this paper: in the considered scenarios, several radio environments are considered, the coverage is guaranteed by different cell types, and the capacity and blockage probability are kept unaltered by the adoption of the green radio approaches with respect to basic configuration. The benefits in terms of energy savings are determined for all possible solutions: within this framework we compare alternative approaches, such as the macro-cell coverage and the strategies which resorts to a higher number of lower power micro-cells to cover the spot.
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Summary. Wireless technology evolution permits users to be always connected to IP-based services through IP-based devices. Furthermore, thanks to wireless technol-ogy progresses, wirelessly connected users may now exploit a bandwidth... more
Summary. Wireless technology evolution permits users to be always connected to IP-based services through IP-based devices. Furthermore, thanks to wireless technol-ogy progresses, wirelessly connected users may now exploit a bandwidth comparable to the one provided by copper-...
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Research Interests: Computer Science, Distributed Computing, A Priori Knowledge, Common Knowledge, Wireless Network, and 13 moreInformation Exchange, Physical Layer, Mutual Information, Physical layer security, Secure Communication, New Physics, Wireless Communication Security, Electrical And Electronic Engineering, Thermal Noise, Key Exchange, Noise Modulation, Probability of Error, and Wireless Personal Communications
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The reasons for the growing interest in reconfigurability is motivated and supported by a technology evolution of signal processing components, such as analog-to-digital and digital-to-analog converters, signal processors and FPGAs,... more
The reasons for the growing interest in reconfigurability is motivated and supported by a technology evolution of signal processing components, such as analog-to-digital and digital-to-analog converters, signal processors and FPGAs, available in the market with ever ...
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Aiming at increasing the satellite link performance, advanced modulation techniques have been thoroughly studied. On the other hand, reliable transmission techniques with a low computational overhead are pursued for many applications in... more
Aiming at increasing the satellite link performance, advanced modulation techniques have been thoroughly studied. On the other hand, reliable transmission techniques with a low computational overhead are pursued for many applications in critical scenarios such as: control operation of a satellite while it is placed into its orbit, the disposal of a satellite at the end of its life or the deep-space missions. In these specific mission critical scenarios, fast and correct data reception is even more important than high channel capacity. An unknown and fast variable channel state condition, with large Doppler shifts and low available power require incoherent and light computationally modulation techniques. This paper introduces a whole digital implementation of a receiver, based on the Double Differential PSK (DD-PSK) modulation, that is perfectly compliant with these requirements.
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Chapter 13 IEEE 802.16: Enhanced Modes of Operation and Integration with Wired MANs Isabella Cerutti, Luca Valcarenghi, Hero Castoldi, Dania Marabissi, Filippo Meucci, Laura Pierucci, Enrico Del Re, Luca Simone Ronga, Ramzi Tka and Farouk... more
Chapter 13 IEEE 802.16: Enhanced Modes of Operation and Integration with Wired MANs Isabella Cerutti, Luca Valcarenghi, Hero Castoldi, Dania Marabissi, Filippo Meucci, Laura Pierucci, Enrico Del Re, Luca Simone Ronga, Ramzi Tka and Farouk Kamoun Abstract The evolution of ...
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This paper aims at investigating some simple cooperative relaying strategies which rely on the exploitation of the Delay Diversity (DD) technique in a DVB-SH compliant hybrid satellite/terrestrial network. In particular the combination of... more
This paper aims at investigating some simple cooperative relaying strategies which rely on the exploitation of the Delay Diversity (DD) technique in a DVB-SH compliant hybrid satellite/terrestrial network. In particular the combination of the proposed cooperative system with the Cyclic Left Sample-Shift of the received signal is adopted in order to simplify the channel estimation process. The opposite effects of
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In the future, the increasing and continuous demand of services anytime and anywhere and, therefore, the mandatory globalization of mobile and wireless communications for next generation networks services will require a more and more... more
In the future, the increasing and continuous demand of services anytime and anywhere and, therefore, the mandatory globalization of mobile and wireless communications for next generation networks services will require a more and more efficient use of the scarce radio spectrum resources. The traditional communication systems which imply an a priori association of the frequency band, the service assigned to it and the technology used, need to become much more flexible, efficient and easy-to-use dynamic systems able to cope with the requirements and constraints of the environment and the users. A Cognitive Radio (CR) approach can be considered as a promising and suitable solution to solve this problem. The CR technologies are able to modify this current communication paradigm because they define a system able to sense the electromagnetic environment (spectrum sensing), detect the spectral resources actually occupied in a given temporal interval and in a given location, and use the free bands (holes) for its own communication.
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ABSTRACT This paper presents the payload design for an in orbit test of W band technology called IKNOW mission (In orbit Key-test and validatioN Of W band). The increasing demand for frequency bands with large bandwidth availability to... more
ABSTRACT This paper presents the payload design for an in orbit test of W band technology called IKNOW mission (In orbit Key-test and validatioN Of W band). The increasing demand for frequency bands with large bandwidth availability to satisfy satellite communications applications requirements renders mandatory the need to explore higher and higher frequency ranges. W band (75-110 GHz) could represent the answer to these needs due to the large bandwidth availability, allowing to propose many innovative services that need high-volume transfers. Therefore, the exploitation of W band is foreseen in order to meet the high-quality data transmission for a large number of end users and data-oriented services. The IKNOW mission is a demonstrative experiment foreseen within the phase A2 of the WAVE (W band analysis and verification) project, a study funded by the Italian Space Agency (ASI), which aims at designing and developing W band payloads for telecommunication applications. This paper will be focused on the characterization of the IKNOW mission within the WAVE project devoted to carry out a preliminary channel propagation assessment. Specifically, special attention will be paid to the payload design, particularly critical from the technological point of view at these high frequencies. The basic idea is to develop the receiving/transmitting chain using MMIC devices, in order to fit cost, power and weight constraints, typically limited for a spacecraft. Technological critical items will be highlighted, focusing on the present state of the art and presenting some architectural choices. Moreover, some simulations based on ADS software will be reported in order to simulate the performance of the identified payload configuration.
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ABSTRACT Orthogonal frequency-division multiplexing (OFDM) is widely used in modern communication systems thanks to the ease of its implementation as well as to a simple design of channel estimation methods. Pilot-based schemes are... more
ABSTRACT Orthogonal frequency-division multiplexing (OFDM) is widely used in modern communication systems thanks to the ease of its implementation as well as to a simple design of channel estimation methods. Pilot-based schemes are commonly employed to recover channel information and implement efficient channel equalisation. From the symbols transmitted over the pilot carriers, the channel coefficients for a whole OFDM are estimated. In this paper, we propose a method to compute in a closed form the mean square estimation error of different linear approximation and interpolation algorithms in the time-frequency domain. Specifically, by exploiting the linear relationship between the estimated channel coefficients for the whole frame and those relative to the pilots, the proposed approach permits to obtain the mean square error relative to all OFDM symbols in a frame. The method can be used for any linear frequency/time interpolation/approximation method and for any choice of pilot positions and channel statistics. Thanks to our derivations, several pilot-aided channel estimation and interpolation algorithms can be compared without resorting to burdensome computer simulations. In order to demonstrate the effectiveness of the method, the downlink of the long term evolution system is taken as a case study: some popular channel estimators have been selected and the best strategy in a realistic wireless scenario is investigated. The performance of the method is also verified by computing, by means of simulations, bit error rate (BER) curves for the long term evolution (LTE) multiple input multiple output (MIMO) downlink, using 2 × 2 and 4 × 4 Alamouti space-frequency coding configurations, in both uncoded and coded communications. Copyright © 2014 John Wiley & Sons, Ltd.
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In this paper we study simple and feasible cooperative relaying strategies which rely on the introduction of the Delay Diversity technique in a DVB-SH compliant hybrid satellite/terrestrial network. These strategies are investigated in a... more
In this paper we study simple and feasible cooperative relaying strategies which rely on the introduction of the Delay Diversity technique in a DVB-SH compliant hybrid satellite/terrestrial network. These strategies are investigated in a public emergency scenario where the adoption of a hybrid network combined with the cooperative diversity techniques guarantees the connection between the incident area and the external
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ABSTRACT This paper investigates the use of bi-orthogonal modulations in multiuser communication systems based on ultra wide band impulse radio (UWB-IR) technology: the communication systems considered herein use Gaussian waveforms in... more
ABSTRACT This paper investigates the use of bi-orthogonal modulations in multiuser communication systems based on ultra wide band impulse radio (UWB-IR) technology: the communication systems considered herein use Gaussian waveforms in AWGN channel and rely on the utilization of a time-hopping spreading technique. A hybrid pulse modulation is defined, which is obtained by combining pulse amplitude modulation (PAM) and pulse position modulation (PPM) techniques. Particularly, we have compared the bi-orthogonal system performance to the classical orthogonal one, also in the condition of lack of a general synchronism, possibly caused by the presence of interfering users that belong to a separate network. Moreover, we have taken into account the use of an M-ary alphabet, in the case of orthogonal and bi-orthogonal modulation schemes. Copyright © 2005 John Wiley & Sons, Ltd.
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Research Interests: Engineering, Technology, Adaptive Signal Processing, Fading, Bit Error Rate, and 15 moreBER, Detectors, Multi-User Detection, Spread Spectrum Communication, Wireless communication systems, Edge Detection Algorithm, Code Division Multiple Access, Wireless Communication, Time varying, Fading channels, Low Complexity, Awgn, Detection Algorithm, Multipath fading channels, and Direct sequence
Research Interests: Engineering, Technology, Mesh generation, Queueing theory, Standardization, and 15 moreUMTS, Satellite Communication, Economic Indicators, Resource Management, Poisson Process, Blocking Probability, Low Earth Orbit, Dynamic Channel Allocation, Mobility Model, Theoretical Model, New Products, Fixed Channel Allocation, Channel Allocation, Gross Domestic Product, and Prediction Algorithms
Research Interests: Engineering, Computer Science, Technology, Queueing theory, Probability, and 12 morePerformance Analysis, UMTS, Satellite Communication, Satellite Networks, QoS, Quality of Service, Analytical Model, Vehicular, Mobiles and Satellite Systems, Low Earth Orbit, User Requirements, and Mobile Environment
This paper deals with an efficient dynamic channel allocation (DCA) technique applicable to terrestrial mobile cellular networks. A channel (or resource) is a fixed frequency bandwidth (FDMA), a specific time-slot within a frame (TDMA),... more
This paper deals with an efficient dynamic channel allocation (DCA) technique applicable to terrestrial mobile cellular networks. A channel (or resource) is a fixed frequency bandwidth (FDMA), a specific time-slot within a frame (TDMA), or a particular code (CDMA), depending on the multiple access technique used. A cost function has been defined by which the optimum channel to be assigned
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Research Interests: Mathematics, Computer Science, Multidisciplinary, Frequency-domain analysis, Eigenvalues, and 11 moreTransfer Function, Filter Design, Digital Filters, Eigenvectors, Frequency Response, Transfer Functions, Frequency Domain, Finite Impulse Response Filter, Digital filter, Infinite Impulse Response, and IIR Filter
AbstractThis paper provides a fair comparison between direct sequence code division multiple access (DS-CDMA) and orthog-onal frequency division multiplexing (OFDM) systems for broad-band downstream power-line communications (PLCs).... more
AbstractThis paper provides a fair comparison between direct sequence code division multiple access (DS-CDMA) and orthog-onal frequency division multiplexing (OFDM) systems for broad-band downstream power-line communications (PLCs). Considered schemes ...
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Research Interests: Computer Science, Distributed Computing, Eastern Europe, Routing, Aerodynamics, and 14 moreMobile Communication, System Architecture, North Africa, Cellular Network, Mobile service, CDMA, IEEE Communications Magazine, Mobile Network, Electrical And Electronic Engineering, Switches, Satellite Network, Base station, Tdma, and Channel Allocation
... 5 # Department of Electronics and Telecommunications University of Florence - CNIT Via S. Marta 3, 50139, Florence, Italy 1 enrico.delre@unifi.it 2 simone.morosi@unifi.it 3 sara.jayousi@cnit. it 4 ... in Wireless Sensors Network CS... more
... 5 # Department of Electronics and Telecommunications University of Florence - CNIT Via S. Marta 3, 50139, Florence, Italy 1 enrico.delre@unifi.it 2 simone.morosi@unifi.it 3 sara.jayousi@cnit. it 4 ... in Wireless Sensors Network CS Raghavendra, KM Sivalingam, and T. Znati, Eds. ...
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Frequency-division multiple access (FDMA) and single channel per carrier (SCPC) in the uplink and time-division multiplexing (TDM) in the downlink are employed in the system described. To interface FDMA in the uplink and TDM in the... more
Frequency-division multiple access (FDMA) and single channel per carrier (SCPC) in the uplink and time-division multiplexing (TDM) in the downlink are employed in the system described. To interface FDMA in the uplink and TDM in the downlink, multicarrier ...
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The foreseen mass diffusion of mobile communication services will require the identification of suitable resource management strategies to utilize efficiently the available spectrum. This paper refers to high-mobility cellular systems and... more
The foreseen mass diffusion of mobile communication services will require the identification of suitable resource management strategies to utilize efficiently the available spectrum. This paper refers to high-mobility cellular systems and carries out a performance evaluation for different channel assignment techniques that belong to the following classes: Fixed Channel Allocation (FCA), or Dynamic Channel Allocation (DCA). Suitable handoff prioritization techniques
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Research Interests: Engineering, Technology, Mesh generation, Queueing theory, Standardization, and 15 moreUMTS, Satellite Communication, Economic Indicators, Resource Management, Poisson Process, Blocking Probability, Low Earth Orbit, Dynamic Channel Allocation, Mobility Model, Theoretical Model, New Products, Fixed Channel Allocation, Channel Allocation, Gross Domestic Product, and Prediction Algorithms
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Research Interests: Distributed Computing, Fading Channel, Adaptive Filtering, Multiuser Detection, Multi-User Detection, and 14 moreHigh performance, CDMA, Wireless communication systems, Multiple-access Interference, Edge Detection Algorithm, Code Division Multiple Access, Electrical And Electronic Engineering, Adaptive Algorithm, Interference Suppression, Time varying, Low Complexity, Detection Algorithm, Multipath fading channels, and Direct sequence
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Research Interests: Engineering, Technology, Signal Processing, Wireless Systems, Algorithm, and 11 moreComputer Simulation, Blind Equalization, Bit Error Rate, Adaptive Filter, Communication Channels, Gradient Method, Addressing, Constant Modulus Algorithm, Fractional Lower Order Statistics, Stochastic Gradient Descent, and Ambient Noise
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SUMMARY Terrestrial cellular networks and mobile satellite systems are expected to converge towards a future integrated satellite/terrestrial mobile communication network. Besides a system globalization, the integration of terrestrial and... more
SUMMARY Terrestrial cellular networks and mobile satellite systems are expected to converge towards a future integrated satellite/terrestrial mobile communication network. Besides a system globalization, the integration of terrestrial and satellite mobile systems will lead to the unloading of the fixed part of the mobile network. This paper proposes an integrated satellite/terrestrial mobile communication system and evaluates its performance in terms of the blocking probability for new call attempts, the call dropping probability and the probability of unsuccessful call. This communication system was simulated and its performence compared with that of a stand-alone terrestrial mobile system. In the terrestrial part of the system we have considered fixed channel allocation (FCA) and dynamic channel allocation (DCA) techniques. Satellite channels can have equal or lower priority compared to terrestrial channels. The improvement of the system performance by means of satellite-to-terrestrial handovers was also estimated .