Abstract: The invention relates to a method of estimating the speed (v) of a mobile station connected by a radio transmission channel to a remote station, said method including the following successive steps: receiving and filtering a transmission signal (s) to obtain a measuring signal reflecting time variations of said transmission channel, determining a correlation function (R(?)) of said measuring signal parametered by the mobile station speed (v), seeking the value (R?(0)) of the second derivation of said correlation function at the origin, estimating the first derivative (?0) of the measuring signal and calculating the variance (C) of the estimate, and identifying the results obtained during the preceding two steps (R?(0)=C).

Abstract: For each base station serving mobile stations in a cell, measurements carried out on radio channels in the cell are used to obtain values of a quantity compared to one or several associated parameters in a procedure managing radio resources allocated to the mobile stations. A statistic of the obtained values the quantity is maintained. The value of each associated parameter for the cell is adapted such that, according to the statistic, a predetermined fraction of the values of the quantity obtained from the measurements are higher than the associated parameter value.

Abstract: A method of estimating a communication path formed of a plurality of channels, the method necessitating an estimate of the impulse response C1, C2, . . . , Cn of the channels, including the following steps of (1) acquiring a space statistic of the transmission path, and (2) establishing a corrected impulse response (C1, C2, . . . , Cn) at least by weighting the impulse responce estimates (C1, C2, . . . , Cn) by the space statistic and an estimate of the additive noise (N01, N02, . . . , N0n) of the channels.

Abstract: A radio station including two antennas combined with respective first and second hybrid transmission polarization couplers is disclosed. Each antenna is arranged to generate two orthogonal electric field components in response to two respective quadrature radio signals from the corresponding polarization coupler. The station further includes at least one hybrid distribution coupler with a first output connected to a first input of the first polarization coupler and a second output connected to a first input of the second polarization coupler and at least one radio signal source delivering a radio signal to a first input of the distribution coupler.

Abstract: Transcoder apparatus is designed to transcode a receive signal (UR) into a transmit signal (UE). For this purpose, it includes a signaling transmitting member (14) for producing a signaling message and for introducing it into the transmit signal by stealing bits from said signal. According to the invention, the signaling transmitter member (14) also comprises a tone generator (15) to add a tone signal (UTS) to the transmit signal (UE) prior to applying the signaling message to said transmit signal.

Abstract: Discrete symbols of transmitted signals, forming part of the components of a vector D of size N, are estimated from a vector Y of L digital samples of a received signal. The vector Y may be broken down into Y=AD+YN, where A is a matrix of size L×N previously determined from measurements of at least one transmission channel reply and YN represents a vector of L noise samples. The method includes determining an upper triangular matrix T of size N×N and a vector Z of size N such that the quadratic criteria ∥TX−Z∥2 and ∥AX−Y∥2 are minimal for the same vector X of size N, and dividing the vector Z and the matrix T into blocks so as to operate a minimisation of the quadratic criterion block by block along the diagonal of matrix T.

Abstract: A method/apparatus for use of the power/frequency characteristics of the candidate transmission for which the frequency must be allocated, the method/apparatus providing a power spectrum of the cumulative effect of the power/frequency characteristic of at least a portion of the existing transmission at a plurality of center frequencies within the frequency spectrum at the time of allocation, calculating allocation based on a first function of a combination of the power spectrum and the power/frequency of the candidate transmission, the first function being determined at different frequencies at the time of allocation, selecting a center frequency for the candidate transmission from the frequency spectrum based on a minimum value among the calculated allocation values or based on a calculated allocation value being below a first threshold value.

Abstract: The invention relates to a method of estimating a transmission channel from a signal (S) received by that channel. The received signal corresponds to a transmitted training sequence, and the method includes the following steps: acquiring a statistic of the transmission channel, establishing an estimate (Xp) of the impulse response of the channel weighted by the statistic of the channel of the received signal (S).

Abstract: The equipment has a wire interface for connection to a wire-Line telecommunication network and an air interface to communicate with mobile stations in accordance with a cellular network operating mode. Each mobile station operates in conjunction with a plug-in subscriber identity module containing parameters used to set up and/or manage the calls. The equipment also has a data reader/recorder suitable for receiving a subscriber module, reading certain parameters from it and writing to it other parameters dependent on the equipment. Telephone calls using a mobile station in conjunction with a subscriber identity module previously inserted in the reader/recorder may then be set up via the wire-line network.

Abstract: The base station has an antenna system comprising a housing for fixing it to a support and one or several radiating slots. It is designed for transmitting, in a first direction substantially perpendicular to the front surface of the housing, an electric field with polarization oriented along a second direction substantially parallel to the front surface, and for transmitting, in another direction closer to the second than to the first direction, an electric field with polarization substantially oriented along the first direction. The base station is well adapted to indoor environments in microcells or picocells. It can be fixed vertically on a wall or be horizontally suspended to a ceiling, without requiring separate antenna systems for these two installation modes.

Abstract: The present invention provides a mobile radio telephone system (10, 15) and a method of operating it in which the beacon frequency is at least temporarily transmitted in a discontinuous manner. This allows a base transceiver station (2, 4, 6, 16, 20, 22) to make use of the gained time for either transmitting on another frequency or monitoring neighboring radio frequency sources for potential interference. In a particular embodiment of the present invention, the beacon frequency is interrupted by connecting the transmission path to the receiver path within the base transceiver station (2, 4, 6, 16, 20, 22). This may be done by single pole double throw high frequency switches. The interruption may be temporary or may applied permanently. Further, in a system in which all transmissions by the base transceiver stations (2, 4, 6, 16, 20, 22) are synchronized, mobile stations (12) are described which are adapted to measure signal strength depending upon the duty cycle of the beacon frequency.

Abstract: At least one fixed beacon is associated with a user of a mobile station and emits, with a range (r) substantially smaller than the characteristic dimension (R) of a cell, a radio signal specific to said user. When the mobile station detects the radio signal emitted by the beacon, the station addresses a signal to the communication network indicating that it is within range of the beacon.