Abstract: The present invention relates to a method of adjusting transmission power on a downlink radio channel in a communication system comprising a user equipment and a base station. In the method uplink power headroom is determined by dividing a maximum transmission power of the user equipment by a transmission power of a control channel of the user equipment and the determined uplink power headroom value is sent to the base station. Then uplink path loss estimate is determined between the user equipment and the base station based on the uplink power headroom. Then an estimate for the downlink path loss is derived and finally the transmission power of the downlink radio channel is adjusted taking into account the downlink path loss estimate.

Abstract: In a spread spectrum digital radio communication receiver, a propagation profile of a propagation channel between a sender and the receiver, including at least one propagation path associated with a reception energy, is determined, data relating to an energy distribution in the propagation profile are measured, and information symbols carried by a signal received originating from the sender over the propagation channel are estimated, by applying to the signal a processing taking into account a predetermined maximum number of propagation paths, the propagation paths taken into account being chosen according to a criterion selected from several criteria as a function of the measured data relating to the energy distribution in the propagation profile.

Abstract: The present invention relates to a method of adjusting transmission power on a downlink radio channel in a communication system comprising a user equipment and a base station. In the method uplink power headroom is determined by dividing a maximum transmission power of the user equipment by a transmission power of a control channel of the user equipment and the determined uplink power headroom value is sent to the base station. Then uplink path loss estimate is determined between the user equipment and the base station based on the uplink power headroom. Then an estimate for the downlink path loss is derived and finally the transmission power of the downlink radio channel is adjusted taking into account the downlink path loss estimate.

Abstract: In a spread spectrum digital radiocommunication receiver, a propagation profile of a propagation channel between sending means and the receiver, including at least one propagation path associated with a reception energy, is determined, data relating to an energy distribution in the propagation profile are measured, and information symbols carried by a signal received originating from sending means over the propagation channel are estimated, by applying to the signal a processing taking into account a predetermined maximum number of propagation paths, the propagation paths taken into account being chosen according to a criterion selected from several criteria as a function of the measured data relating to the energy distribution in the propagation profile.

Abstract: The signal received comprises contributions from several channels multiplexed by respective spreading codes. After having estimated response parameters of the channels, soft estimates of the symbols transmitted are calculated. These symbols are then apportioned between a first set of symbols satisfying a confidence criterion applied to the calculated soft estimates and a second set of symbols not satisfying this criterion. A modified signal is determined by subtracting estimated contributions corresponding to the symbols of the first set from the signal received. New soft estimates of the symbols of the second set only are calculated, as a function of the modified signal and of the estimated response parameters, and this may be done with a detection algorithm of more complex nature, in particular a multi-user algorithm, by virtue of the size reduction performed by restricting oneself to the symbols of the second set.

Abstract: The sender includes a first source of M-ary symbols and a second source of M′-ary symbols, with M′>M>1, for example M=2, M′=8. The frames delivered by one of the sources are interleaved into successive blocks each including symbols obtained from at least two frames. Each block gives rise to a burst of modulated signal produced either by a first modulator of M-ary symbols or by a second modulator of M′-ary symbols. In response to a change of the active source, certain M-ary symbols originating from the first source are converted into M′-ary symbols to produce at least one block of M′-ary symbols submitted to the second modulator and including both symbols from at least one frame delivered by the second source and symbols obtained by conversion of M-ary symbols from at least one frame delivered by the first source.