Abstract: For processing symbols transmitted in frames and separated by guard intervals via a propagation channel between first and second communicating entities using time-division duplexing, the second entity receives at least one pulse transmitted by the first entity. The second entity estimates the impulse response of the propagation channel as a function of the pulse received and time reverses the estimated impulse response in order to filter the symbols as a function of the time-reversed impulse response. The second entity then transmits the modulated symbols and a second pulse to the first entity during a guard interval in a frame in order to process the modulated symbols.

Abstract: A method of guidance by radio focusing includes a “visitor” entity heading towards a radio source of number k=1 (or k=klast) by observing intensity of the radio source of number k=1 (or k=klast) as measured by an “Evisitor” communicating device carried by the visitor, until the visitor reaches the source of number k=1 (or k=klast). The visitor heads in succession for k=1, 2, . . . , klast-1 (or in reverse) from a radio source of number k towards a radio source of number (k+1) (or (k?1)) by observing intensity of the source (k+1) (or (k?1)), until the visitor reaches the source (k+1) (or (k?1)). Each radio source is a virtual radio source as produced by a respective signal k or by superposing a plurality of respective signals k. Each signal is transmitted by a respective communicating device ER.

Abstract: The invention relates to a multiantenna radio communications method wherein frequency subbands Bsk, for k=1, . . . , P, are allocated respectively to P user antennas s1, . . . , sP belonging to one or more users, from within a total frequency bandwidth BT, and wherein at least one of the user antennas communicates with the base station over its respective frequency subband Bsk by means of a signal that has been filtered by time reversal. According to the invention, for at least one pair of user antennas si and sj, where and i, j=1, . . . , P and i?j, the respective frequency subbands Bsi and Bsj overlap by ?Bsi,sj, said overlap ?Bsi,sj being a predetermined function of the correlation between the respective propagation channels of these two user antennas with said base station.

Abstract: A method is provided for dynamically controlling the focus of a signal pre-equalized by time reversal of an estimated propagation channel between a source antenna of a source communicating entity and a destination antenna of a destination communicating entity at a current instant, said method comprising steps for evaluation by the destination communicating entity of a relative focus quality of the pre-equalized signal sent by the source antenna and received by the destination antenna, compared to a quality at a focal point, and if the evaluated relative focus quality does not satisfy a predetermined criterion, for request, by the destination communicating entity, to modify the focus addressed to the source communicating entity for a subsequent instant.

Abstract: A method is provided for estimating the focusing quality of a signal pre-equalized by time reversal of an estimated propagation channel between a source antenna of a source communicating entity and a destination antenna of a destination communicating entity, the method comprising a step of evaluating a focusing quality of the signal received at the destination antenna relative to a value at a focal point of a representation of a curve of received power as a function of a distance between the destination antenna and the focal point.

Abstract: The invention provides a method of allocating resources to mobile terminals. The method comprises the following iterative steps: mobile terminals having at least one elastic link cause the data rates on their elastic links to grow in application of a predetermined temporal law; and when a mobile terminal having at least one constant link detects that its coverage on the constant link is threatened, it sends an alert message to the base station of the cell, with said base station then requiring said mobile terminals that have at least one elastic link to reduce temporarily their data rates on those elastic links by a predetermined quantity. The method is applicable to networks of the W-CDMA type or of the LTE type.

Abstract: A method and apparatus are provided for transmitting a source signal including a plurality of binary sequences to NR receiving antennas, where NR is no lower than 2. The method implements, for at least one first binary sequence of the source signal, pre-filtering for focusing a signal to be transmitted on at least one of the reception antennas, referred to as the target antenna. The target antenna and the associated focus pre-filtering step are selected according to a value of the first binary sequence intended for being considered as received. The method also includes transmitting the pre-filtered signal.

Abstract: A method of dynamically compensating a movement of a source communicating entity relative to a destination communicating entity comprising a set of destination antennas, an antenna data signal transmitted by a source antenna of the source communicating entity being pre-equalized by time reversing an estimated propagation channel between said source antenna and a reference destination antenna at a current time, the method comprising the iterative steps of the destination communicating entity estimating a current focus, estimating movement of the current focus, and selecting, for the next time period, a reference destination antenna for estimating the propagation channel and a target destination antenna for receiving said data signal.

Abstract: A method and apparatus are provided for managing transmission resources in a cellular communication network having a plurality of cells each associated to a base station. The network includes at least two radio-communication terminals, a list of available transport formats or authorized list being associated with each of the terminals. The method includes optimizing frequency resources used by the terminals present in the network, and includes the following sub-steps: selecting a transport format specific for each terminal from a shortened list of transport formats, and allocating a frequency band to each terminal and having a size based on the selected transport format.

Abstract: A method of pre-equalizing a data signal transmitted in frequency division duplex includes receiving via an originating reference antenna a first pilot sequence transmitted by a destination antenna through a first channel, and estimating a first impulse response of the first channel; receiving via a destination antenna a second pilot sequence transmitted by an originating antenna through a second channel, and estimating a second impulse response of the second channel; receiving, via the reference antenna, a third pilot sequence modulated by the second impulse response and transmitted by the destination antenna, and estimating a combined impulse response of the first and second channels in succession; time reversing the combined impulse response; combining the time-reversed combined impulse response and the first impulse response; re-iterating the steps for a portion of the destination and originating antennas; and determining pre-equalization coefficients for the data signal from a set of the impulse response

Abstract: Pre-equalizing a data signal transmitted in frequency division duplex by an originating entity having a set of originating antennas to a destination entity having a set of destination antennas, including: transmitting a first pilot by a destination antenna; the originating entity estimating a first impulse response of a first channel; an iterative step including an originating antenna transmitting a second pilot modulated by the first impulse response; the destination entity estimating and time reversing a combined impulse response of the first and second channels; the destination antenna transmitting a third pilot modulated by the time-reversed response; estimating a composite response of the channels; re-iterating the iterative step for some originating antennas; and re-iterating the steps of transmitting a first pilot, estimating the first response, and the iterative step for some destination antennas; and determining pre-equalization coefficients for the data signal from a combination of a set of composit

Abstract: A method is provided for estimating the focusing quality of a signal pre-equalized by time reversal of an estimated propagation channel between a source antenna of a source communicating entity and a destination antenna of a destination communicating entity, the method comprising a step of evaluating a focusing quality of the signal received at the destination antenna relative to a value at a focal point of a representation of a curve of received power as a function of a distance between the destination antenna and the focal point.

Abstract: A method is provided for dynamically controlling the focus of a signal pre-equalized by time reversal of an estimated propagation channel between a source antenna of a source communicating entity and a destination antenna of a destination communicating entity at a current instant, said method comprising steps for evaluation by the destination communicating entity of a relative focus quality of the pre-equalized signal sent by the source antenna and received by the destination antenna, compared to a quality at a focal point, and if the evaluated relative focus quality does not satisfy a predetermined criterion, for request, by the destination communicating entity, to modify the focus addressed to the source communicating entity for a subsequent instant.

Abstract: A method of dynamically compensating a movement of a source communicating entity relative to a destination communicating entity comprising a set of destination antennas, an antenna data signal transmitted by a source antenna of the source communicating entity being pre-equalized by time reversing an estimated propagation channel between said source antenna and a reference destination antenna at a current time, the method comprising the iterative steps of the destination communicating entity estimating a current focus, estimating movement of the current focus, and selecting, for the next time period, a reference destination antenna for estimating the propagation channel and a target destination antenna for receiving said data signal.

Abstract: A method of pre-equalizing a data signal transmitted by a source communicating entity comprising a set of source antennas to a destination communicating entity comprising a set of destination antennas, the method comprising a step of a reference antenna of the set of source antennas receiving a first pulse transmitted by a destination antenna via a first propagation channel, a step of the reference antenna receiving a combined impulse response representing the successive passages of a second pulse through a second propagation channel between a source antenna and the destination antenna and the first propagation channel, a step of time reversing the combined impulse response, a step of combining the time-reversed combined impulse response and an impulse response representing the passage of said first pulse through said first propagation channel, the above steps being repeated for at least a portion of the set of destination antennas and at least a portion of the set of source antennas, and a step of determinin

Abstract: A method of pre-equalizing a frequency-division duplex data signal transmitted by a source communicating entity having a set of source antennas to a destination communicating entity having a set of destination antennas, the method comprising a step of transmitting a pulse via a destination antenna to the source communicating entity, a step of the destination antenna transmitting to the source communicating entity a combined impulse response representing the successive passage of said pulse through a first propagation channel between the destination antenna and a reference antenna of the set of source antennas and a second propagation channel between a source antenna and the destination antenna, said step being repeated for at least some of the source antennas, the steps of transmission of a pulse and iterative transmission of a time-reversed impulse response being repeated for at least some of the destination antennas, and a step of determining pre-equalization coefficients of the data signal from a combinati

Abstract: A method and apparatus are provided for managing transmission resources in a cellular communication network having a plurality of cells each associated to a base station. The network includes at least two radio-communication terminals, a list of available transport formats or authorized list being associated with each of the terminals. The method includes optimizing frequency resources used by the terminals present in the network, and includes the following sub-steps: selecting a transport format specific for each terminal from a shortened list of transport formats, and allocating a frequency band to each terminal and having a size based on the selected transport format.

Abstract: For processing symbols transmitted in frames and separated by guard slots via a propagation channel between first and second communicating entities (EC1, EC2) using time-division duplexing, the second entity (EC2) receives at least one pulse (IMP) transmitted by the first entity (EC1). The second entity estimates the impulse response of the propagation channel as a function of the pulse received and time reverses the estimated impulse response in order to filter the symbols as a function of the time-reversed impulse response. The second entity then transmits the modulated symbols and a second pulse to the first entity during a guard slot in a frame (TR2) in order to process the modulated symbols.