Abstract: A method for increasing the amount of information bits comprised in a symbol transferred by a source to at least one receiver. The symbol is representative of a modulated base sequence obtained by encoding a sequence of base bits selected by the source and by modulating the encoded selected sequence. The modulated base sequence has fixed points. The source encodes the selected sequence of base bits and a sequence of supplementary bits, obtains a modulated base sequence by modulating the encoded selected sequence of base bits, obtains a modulated altering sequence by modulating the sequence of supplementary bits, alters the modulated base sequence by modifying at least a part of the values of its fixed points using the modulated altering sequence in order to obtain a modulated altered sequence, and transfers the modulated altered sequence under the form of an altered symbol.

Abstract: A method for increasing the amount of information bits comprised in a symbol transferred by a source to at least one receiver. The symbol is representative of a modulated base sequence obtained by encoding a sequence of base bits selected by the source and by modulating the encoded selected sequence. The modulated base sequence has fixed points. The source encodes the selected sequence of base bits and a sequence of supplementary bits, obtains a modulated base sequence by modulating the encoded selected sequence of base bits, obtains a modulated altering sequence by modulating the sequence of supplementary bits, alters the modulated base sequence by modifying at least a part of the values of its fixed points using the modulated altering sequence in order to obtain a modulated altered sequence, and transfers the modulated altered sequence under the form of an altered symbol.

Abstract: A method for decoding differentially modulated received symbols, the differentially modulated received symbols corresponding to a transmission of a differentially modulated version of a codeword out of a set of possible codewords, the received symbols being transferred onto resources of a channel, the resources being equally spaced. A receiver, for each possible codeword: obtains a vector of differentially demodulated symbols by differentially demodulating the differentially modulated received symbols obtained by combining two consecutive differentially modulated received symbols; calculates the product of each differentially demodulated symbol by the conjugate of the element of the codeword having the same rank within the codeword as the differentially demodulated received symbol; calculates the sum of the products; decodes the vector of differentially demodulated symbols by selecting the codeword for which the sum of the products is the maximum.

Abstract: A method and device for transferring OFDM symbols representative of at least a first and a second stream from a source including a first number of antenna to at least one receiver. The source demultiplexes the first stream to extract at least one first pilot sequence and first data and the second stream to extract at least one second pilot sequence and second data, multiplies the at least one first pilot sequence and first data by a first coefficient, the at least one second pilot sequence and second data by a second coefficient different from the first coefficient, sums first multiplied data and second multiplied data, multiplexes the sum, the at least one first and second multiplied pilot sequences to form the OFDM symbols, and transfers the OFDM symbols.

Abstract: A method for determining a shifting parameter P to be used by a telecommunication device for mapping symbols on sub-carriers, the telecommunication device including at least two transmit antennas, the symbols being transferred through each antenna of the telecommunication device on at least an even number K, strictly greater than two, of sub-carriers allocated to the telecommunication device. The telecommunication device transfers on a first antenna on each sub-carrier ‘k’, a signal representing a symbol ‘Xk’ in the frequency domain. The telecommunication device transfers on a second antenna on each sub-carrier ‘k’, a signal representing a symbol ‘X?k’ derived from the signal transferred on the first transmit antenna, for each frequency k, by the formula X?KsecondAnt=?(?1)k+1X*(p-1-k)mod K.

Abstract: The present invention concerns a method and a device for obtaining, by a first telecommunication device and from a second telecommunication device, information representative of the channel quality indication on at least one frequency subband, the first and the second telecommunication devices being linked through a wireless telecommunication network using a plurality of frequency subbands. The frequency subbands are grouped into groups of at least one frequency subband, and the first telecommunication device transfers a message to the second telecommunication device, the message comprising information identifying a first group of at least one frequency subband, receives, from the second telecommunication device, for each frequency subband comprised in the first group, an information representative of the channel quality indication determined by the second telecommunication device for the frequency subband comprised in the first group.

Abstract: The present invention concerns a method and a device for obtaining, by a first telecommunication device and from a second telecommunication device, information representative of the channel quality indication on at least one frequency subband, the first and the second telecommunication devices being linked through a wireless telecommunication network using a plurality of frequency subbands. The frequency subbands are grouped into groups of at least one frequency subband, and the first telecommunication device transfers a message to the second telecommunication device, the message comprising information identifying a first group of at least one frequency subband, receives, from the second telecommunication device, for each frequency subband comprised in the first group, an information representative of the channel quality indication determined by the second telecommunication device for the frequency subband comprised in the first group.

Abstract: A method for identifying at least one terminal for which signals transferred between the at least one terminal and a base station of a wireless cellular telecommunication network have to be relayed by a relay, the base station providing a random access channel enabling a terminal to notify to the base station the presence of the terminal by transferring a random access signal to the base station. The relay device transfers the random access signal to the base station, receives the list, identifies, from the received list, at least one terminal for which signals transferred between the at least one identified terminal and the base station have to be relayed by the relay, and relays signals between the at least one identified terminal and the base station.

Abstract: A method for determining a corrected estimated variance representative of the condition of reception of signals representative of symbols transferred by an emitter to a receiver through a communication channel. The method includes, executed by the receiver, producing an estimation of the variance by a Wiener channel estimator comprising a linear filter of which coefficients are determined at least from a given average signal to interference plus noise ratio value. The method further includes, executed by the receiver, multiplying the estimation of the variance by a correction factor. The value of the correction factor, being dependent at least on the number of coefficients of the linear filter of the Wiener channel estimator.

Abstract: The present invention concerns a method for adjusting the transmission power of signals transferred by or to a first base station, the first base station being located in the cell of a second base station, the first base station: transfers a first message to the second base station, receives a message comprising information representative of the path between the first base station and the second base station, receives messages transferred by the second base station to mobile terminals, information comprised in at least one message enabling the determination of the coverage of the second base station, computing a metric from both information, adjusting, according to the computed metric, the transmission power of the signals transferred by the first base station to at least a mobile terminal and/or the transmission power of the signals transferred to the first base station by at least one mobile terminal.

Abstract: The present invention concerns a method for transferring information enabling the adjustment of the transmission power of the signals transferred and/or received by a first base station through a wireless interface, a cell of the first base station being at least partly comprised in a cell of a second base station. A mobile terminal for which a handover has been or has to be conducted between the first and second base stations obtains information related to the path between the second base station and the mobile terminal and transfers information to the first base station.

Abstract: In a wireless communication system a frame composed of plural single carrier orthogonal frequency division multiplex symbols is transferred between a source and a receiver. The frame includes at least one hybrid symbol which is composed of at least one pilot sequence which is mapped on one subcarrier in two of at least a part of subcarriers on which the hybrid symbol is mapped and of discrete Fourier transformed data which are mapped on at least subcarriers comprised between two subcarriers on which the at least one pilot sequence is mapped. The at least one pilot sequence has the property that the variations of amplitudes obtained after performing a discrete Fourier transform over the at least one pilot sequence are limited. The frame also includes other symbols composed of discrete Fourier transformed data only.

Abstract: The present invention concerns a method for allocating, by a telecommunication device, at least a channel element of a group of channel elements of a channel resource to a destination. Each channel element is a predefined subdivision of the channel resource. The telecommunication device: determines the number of channel elements to be allocated to the destination; selects at least one randomization function according to the number of channel elements to be allocated to the destination; processes the data to be included in the or each channel element to be allocated to the destination by the at least one selected randomization function; transfers the data processed by the at least one selected randomization function by mapping the data processed by the at least one randomization function on the at least one channel element.

Abstract: A method for determining shifting parameters p1 and p2 to be used by a first and a second telecommunication devices for mapping symbols on sub-carriers. The method comprises the steps of: allocating to the first and the second telecommunication device sub-carriers, at least a part of the sub-carriers allocated to the first telecommunication device being allocated to the second telecommunication device, determining the shifting parameter p2, the shifting parameter p2 being even and at least equal to the number of overlapping sub-carriers allocated to both the first and the second telecommunication devices or the shifting parameter p2 being even and at most equal to M2 minus the number of overlapping sub-carriers allocated to both the first and the second telecommunication devices.

Abstract: The present invention relates to a method for transmitting data Di in a telecommunication system SYST including a first transceiver TXi and a second transceiver RX linked together by means of a communication channel Chi, one of which transceivers being mobile, which method includes: a spreading step for spreading said data Di over a plurality of components Ctj (for j=1 to M), and an equalization step during which each component Ctj (for j=1 to M) is multiplied by an equalization value Wi(j)* representative of communication conditions within the communication channel Chi. According to the invention, the equalization values Wi(j)* are also representative of a Doppler effect generated by movement of the mobile transceiver. The invention enables to significantly compensate for alterations caused to the communication channel Chi by movement of the mobile transceiver.

Abstract: A SC-QOSTFBC (Single Carrier-Quasi Orthogonal Space Time Frequency Block Code) for 4 transmit antennas in the domain of wireless communication, and coding and decoding schemes useful in the context of MIMO (Multiple Input Multiple Output) or MISO (Multiple Input Single Output) communications especially used in conjunction of OFDM-like transmission schemes. These codes are based on sending on a first antenna a constellation corresponding to what would be sent in a mono antenna scheme, and sending equivalent constellations on the other antennas. The codes are designed to keep a low-PAPR property at each transmit antenna when associated with DFT spread OFDM.

Abstract: A method for transmitting data in a telecommunication system including at least one transmitter comprising at least two transmitting antennas and at least one receiver comprising at least one receiving antenna, the method including: transforming a plurality of bits of the data to be transmitted into a plurality of symbols by modulating the plurality of bits of the data at the transmitter; generating a first vector formed by the plurality of symbols at the transmitter; preparing a modified matrix by modifying an original matrix based on the number of rows of the first vector, the original matrix being predefined at the transmitter; generating a second vector by multiplying the first vector with the modified matrix at the transmitter; and transmitting symbols forming the second vector over communication channels established between the at least two transmitting antennas of the transmitter and the at least one receiving antenna of the receiver.

Abstract: Coding and decoding schemes useful in the context of MIMO (Multiple Input Multiple Output) or MISO (Multiple Input Single Output) communications especially used in conjunction of OFDM-like transmission schemes. A space frequency block code (SFBC) is based on the simultaneous use of two variants of Alamouti codes in the frequency domain, each kind of Alamouti code being applied to well-chosen pair of frequencies. The proposed SFBC keeps the constant envelope property for each antenna while leading to performance equal or very close to the pure Alamouti STBC performance.

Abstract: The present invention concerns a method for obtaining a context of a mobile terminal (30) which is expecting to be served by a first base station (10b) of a wireless telecommunication network comprising a plurality of base stations (10) linked together by a telecommunication network. The first base station which is expected to serve the mobile terminal, receives a first message from the mobile terminal (30) through a wireless interface, the message comprising at least an identifier of the mobile terminal (30) and an identifier of a second base station (10a), transfers through the telecommunication network (50) a second message to the second base station (10a) of which the identifier is comprised in the received message, receives through the telecommunication network a third message from the second base station, the third message message comprising the context of the mobile terminal.

Abstract: A method for determining at least one terminal for which signals transferred between the at least one terminal and a base station of a wireless cellular telecommunication network have to be relayed by a relay, the base station allocating resources of the wireless cellular telecommunication network. The method includes, executed by a management entity: receiving from the base station, information indicating to which terminal or terminals at least a part of the resources are allocated; receiving from the relay, a list of indicators of resources, and determining the at least one terminal for which signals transferred between the at least one terminal and the base station have to be relayed by the relay according to the information indicating to which terminal or terminals at least a part of the resources are allocated and to the list of indicators of resources.