Telecom Italia S.p.a.

Pirelli & C. S. P. A.

Stmicroelectronics S.r.l.

Infineon Technologies Ag

Advanced Digital Broadcast S.a.

Telecon Italia S.p.a.

Adb Broadband S.p.a.

Alfredo Ruscitto

Bruno Melis

Paolo Semenzato

Maurizio Graziano

Donato Ettorre

Loris Bollea

Valeria D'Amico

Andrea Finotello

Giuseppe Grassano

Maurizio Fodrini

Paolo Gianola

Vincenzo Boffa

Roberto Fantini

Mauro Renato Boldi

Paolo Gallo

Renata Mele

Fabrizio Gatti

Peter Jung

Burkhard Becker

Markus Doetsch

Jörg Plechinger

Tideya Kella

Stefano Valle

Daniele Franceschini

Giorgio Bertin

Luciano Accatino

Roberto Vallauri

Roberto Rossi

Lorena Simoni

Alessandro Ossoli

Rosalba Campanale

Gaetano Francesco Cazzatello

Federica Caldara

Luca Risi

Pietro Di Paola

Valeria D'AMICO

Maurizio Telecom Italia SpA Graziano

Bruno Telecom Italia SpA Melis

A method of arranging exchange of signals between user terminals in a cellular communication system and at least one base station. The base station includes a central unit and a plurality of remote units. The signals are exchanged between the central unit and the remote units as aggregated signals for plural user terminals. The signals are processed at the remote units as distinct signals each associated with a respective one of the plural user terminals.

Method for distributed mobile communications, corresponding system and computer program product

A method of arranging exchange of signals between user terminals in a cellular communication system and at least one base station including a central unit and a plurality of remote units. The method includes exchanging signals with at least one user terminal simultaneously via at least two remote units by applying at the at least two remote units, separate distributing weighting functions to the signals exchanged with the at least one user terminal.

Method for adaptive distributed mobile communications, corresponding system and computer program product

A dual-mode terminal designed to connect to an IP-based network via a first communication system and a second communication system, the dual-mode terminal including a first physical network interface module adapted to establish a packet-based communication with the IP-based network via the first communication system, the first physical network interface module being accessible via a first physical network interface having a first physical network address; a second physical network interface module adapted to establish a packet-based communication with the IP-based network via the second communication system, the second physical network interface module being accessible via a second physical network interface having a second physical network address; an IP-based protocol stack adapted to operate between a software application in the dual-mode terminal and the first and second physical network interface modules; and a system for performing a seamless handover between the first communication system and the second communication system during a connection to the IP-based network.

Management of seamless handover between different communication systems in an IP dual-mode terminal

Digital signals are transmitted over a communication channel having a given bandwidth, by simultaneously transmitting: one or more Spread Spectrum signals, such as, Code Division Multiple Access signals, wherein the spectrum of the Spread Spectrum signals exhibits roll-off transition bands at the boundaries of the spectrum, and one or more multi-carrier transmission signals, such as, Orthogonal Frequency Division Multiplexing signals, which are transmitted over the transition bands of the Spread Spectrum signals.

Method of transmitting digital signals, corresponding transmission system, signal and computer program product therefor

A system for processing an RF signal received via a plurality of antenna elements includes a connection arrangement for selecting a sub-set of a given number of RF signals received from the antenna elements as well as a processing arrangement for combining the received RF signals of the selected sub-set into a single RF signal for demodulation. The system includes an RF phasing circuit for producing selective combinations of the received RF signals by applying relative RF phase shift weights to the RF signals that are combined; each combination includes RF signals received from a number of adjacent antenna elements equal to the number of the RF signals in the sub-set to be selected. A radio performance estimator generates for each selective combination of RF signals at least one non-RF radio performance indicator representative of the quality of the RF signals in the combination. A decision block identifies the sub-set of received RF signals to be selected as a function of the one radio performance indicator generated for the selective combinations of the received RF signals.

Method and system for switched beam antenna communications

Disclosed herein is a method of managing a hybrid network including a cellular network and a local network wherein a number of dual mode mobile terminals are connectable to a base station of the cellular network through a direct cellular link and are also connectable, one with respect to the other, through the local network by a radio access technique. The method includes the steps of computing a cost associated with a direct connection established along a path (A) extending from a selected mobile terminal to the base station through the cellular link only, computing a cost (C) associated with at least one indirect connection established along a path (B) extending from the selected mobile terminal to the base station through the local network and the cellular network, and selecting for data transmission the path that minimizes the cost.

Management of a hybrid communication network comprising a cellular network and a local network

A method of transmitting signals from a base station towards user terminals in a cellular communication system. The method includes generating diversity signals, wherein at least one of the diversity signals is subjected to a selectively variable RF phase shift. Specifically, a set of radio link quality indicators is determined at the base station, wherein each radio link quality indicator is representative of the quality of the radio link between the base station and a respective one of the user terminals. The set of radio link quality indicators is used to generate an aggregated radio quality indicator, which in turn is used to selectively vary the variable RF phase shift. For example, the phase shift may be selected, which optimizes the aggregated radio quality indicator.

Method of transmitting data, corresponding systems and computer program product therefor

Signals received from channels exposed to multi-path propagation via a plurality of diversity antennas and including at least one pilot signal are processed by detecting a set of multi-path components for each received signal and computing a set of channel coefficients from multi-path components of the at least one pilot signal in the set of multi-path components. The set of channel coefficients is organized as a channel coefficient vector. From the channel coefficient vector, a set of combining weights is estimated to be applied to the received signals by: computing a spatial correlation matrix of the channel coefficient vector by neglecting the correlations between multi-path components of the channel coefficient vector having different delays, whereby the correlation matrix is a block diagonal matrix including null coefficients other than for non-null sub-matrixes arranged along the diagonal of the correlation matrix, wherein the sub-matrixes have a size equal to the number of diversity antennas; deriving from the spatial correlation matrix a resulting matrix by calculating the inverse of the sub-matrixes or a scaled version thereof; and multiplying the resulting matrix and the channel coefficient vector in order to obtain the desired set of combining weights.

Method of processing received signals, corresponding receiver and computer program product therefor

A tunable delay line for radiofrequency or microwave frequency applications consists of at least one ridge waveguide in which the ridge is movable in the waveguide body so as to vary the width of an air gap defined between the longitudinal end surface of the ridge and a confronting member of the waveguide. The ridge is moved by an actuator external to the waveguide body.

Tunable waveguide delay line having a movable ridge for providing continuous delay

A system for diversity processing two signals transmitted and/or received via two diversity antennas includes at least four respective propagation paths coupling the signals to the two diversity antennas. Diversity processing is primarily in the form of decorrelation achieved by means of time variable delay elements that apply time variable delays to the signals propagating over at least two of the propagation paths in the system. The related processing may take place either at RF or IF, or at baseband, whereby the time variable delays are applied by subjecting the baseband signals to multiplication by a complex signal.

Method and system for multiple antenna communications, related apparatus and corresponding computer program product

A wireless communication system, wherein a sub-set of radio frequency signals received from corresponding antenna elements is selected and combined into a single radio frequency signal, the single radio frequency signal being processed and demodulated in a single processing chain, includes a radio frequency phasing network for co-phasing the selected radio frequency signals before combining and a processor for controlling combining and phasing in order to obtain a single radio frequency signal having a radio performance indicator which satisfies predetermined conditions.

Switched beam antenna with digitally controlled weighted radio frequency combining

A system for diversity processing a signal propagated via two diversity antennas includes: respective propagation paths for propagating two replicas of the signal, these propagation paths being coupled to the two diversity antennas so that the replicas are propagated via different antennas; a time variable delay element for subjecting at least one of the replicas to a time variable delay; and a level adjusting element, such as an asymmetric splitter, to produce a level imbalance between the power levels of the replicas propagated via the two diversity antennas.

Method and system for multiple antenna communications using multiple transmission modes, related apparatus and computer program product

In a communication system, such as a Multiple Input Multiple Output system operating in a spatial multiplexing mode, for use, e.g., in a WLAN or HSPDA device, a plurality of information flows are received via a set of receive antennas by deriving from at least some, and possibly all, of the receive antennas, respective RF signals, and producing from the RF signals thus derived, a plurality of receive signals, each receive signal to be demodulated to recover one of the information flows transmitted. The receive signals are produced as combinations of the RF signals having applied thereto relative RF phase shift weights.

Method and systems for receiving plural information flows in a MIMO system

A method of radiating a radioelectric signal in an area of interest composed of at least two different area sectors, the method including providing at least two sector antennas arranged respective feed signals obtained from said signal; spacing apart the at least two sector antennas from each other of a distance equal to or greater than one wavelength of a radioelectric signal to be irradiated; and acting on the feed signals fed to the at least two sector antennas in such a way that a relative phase of signals transmitted by the at least two sector antennas is caused to vary in time.

Method and system for radiating a radioelectric signal through a combination of sector antennas

A system for transmitting a signal via diversity antennas includes at least one delay element for generating at least one delayed replica of the signal subject to a given delay, the signal and the at least one delayed replica being adapted to be transmitted via the diversity antennas, and a control unit for the at least one delay element for varying the given delay, whereby the signal and the at least one delayed replica, transmitted via the diversity antennas, give rise to alternate constructive and destructive combinations therebetween.

Variable delay transmit diversity

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Turin, Italy

Alfredo Ruscitto