Abstract: In an example embodiment a method comprises receiving at least one data stream from at least two transmitter antennas, wherein the at least one data stream is pre-coded by a set of weighting coefficients; receiving a pilot channel from each of the at least two transmitter antennas; processing the received at least one data stream by an equalizer with a set of equalizer filter coefficients; calculating for each of the at least one data stream following: a signal power and an interference power from other stream, if there is any intererence, at least in part based on a set of post equalizer channel coefficients and the set of weighting coefficients; a noise power at least in part based on the received pilot channels and the set of weighting coefficients; and a signal to interference and noise ratio based on the corresponding calculated signal power, interference power and noise power.

Abstract: In an example embodiment a method comprises receiving at least one data stream from at least two transmitter antennas, wherein the at least one data stream is pre-coded by a set of weighting coefficients; receiving a pilot channel from each of the at least two transmitter antennas; processing the received at least one data stream by an equalizer with a set of equalizer filter coefficients; calculating for each of the at least one data stream following: a signal power and an interference power from other stream, if there is any intererence, at least in part based on a set of post equalizer channel coefficients and the set of weighting coefficients; a noise power at least in part based on the received pilot channels and the set of weighting coefficients; and a signal to interference and noise ratio based on the corresponding calculated signal power, interference power and noise power.

Abstract: The invention relates to a method for synchronizing the phase of a code available at a receiving unit with the phase of a corresponding code of which samples are received at said receiving unit. The synchronization comprises comparing a received code sample with different samples of the available code, the respective sample of the available code being shifted in phase for each comparison by a predetermined amount until a correspondence with the received code sample is determined or until an interrupt of the synchronization occurs. In order to accelerate the synchronization, it is proposed to continue the synchronization after an interrupt with a newly received code sample and with available code samples proceeding from the code phase of the available code reached in the synchronization before the interrupt. The invention relates equally to a corresponding receiving unit and to a communication system comprising such a receiving unit.

Abstract: A synchroniser for use in a receiver which receives signals, wherein the synchronizer provides a digital control signal, the control signal defining a plurality of different levels; controls the level provided by successive ones of the control signals, successive ones of the control signal defining different values; and estimates the difference between the levels of successive ones of the control signals.

Abstract: The invention relates to a method for synchronizing the phase of a code available at a receiving unit with the phase of a corresponding code of which samples are received at said receiving unit. The synchronization comprises comparing a received code sample with different samples of the available code, the respective sample of the available code being shifted in phase for each comparison by a predetermined amount until a correspondence with the received code sample is determined or until an interrupt of the synchronization occurs. In order to accelerate the synchronization, it is proposed to continue the synchronization after an interrupt with a newly received code sample and with available code samples proceeding from the code phase of the available code reached in the synchronization before the interrupt. The invention relates equally to a corresponding receiving unit and to a communication system comprising such a receiving unit.

Abstract: A method is disclosed for operating a wireless mobile station to receive a time slot sent through a radio channel from a transmitter. In a GPRS embodiment the time slot has a Header portion and a Data portion, wherein the Header portion contains information for specifying whether the Data portion is modulated using 8-PSK modulation or &pgr;/4-shifted DQPSK modulation. When modulated using 8-PSK modulation, the Data portion includes a plurality of Pilot symbol sequences at predetermined locations.

Abstract: A method for operating a wireless terminal in a wireless communication system that operates with frames time divided into slots each having a Header portion followed by a Data portion. The system is arranged to transmit a downlink slot so that the Header portion is transmitted at a higher power level than the Data portion when the Data portion does not contain valid data so as to reduce system interference. This is known as a Quasi-Discontinuous Transmission (Q-DTX) mode of operation.

Abstract: A synchroniser for use in a receiver which receives signals, said synchroniser comprising means for providing a digital control signal, said control signal defining a plurality of different levels; means for controlling the level provided by successive ones of said control signals, successive ones of said control signal defining different values; and means for estimating the difference between the levels of successive ones of said control signals.

Abstract: Apparatus, and an associated method, by which to transmit packet data from a mobile station to network infrastructure of a TDMA, cellular communication system at an increased rate. The increased rate is provided while still operating the mobile station in half-duplex mode of operation. In one implementation, the mobile station is operable to effectuate triple-rate communication of packet data at a multi-rate defined in the GPRS-136 standard.

Abstract: The present invention relates to a diversity method in a radio system in which fadeouts are slow, such as a WLL system. The duration of fadeouts is typically in the magnitude of seconds. A radio receiver (4) according to the present invention is characterized in that the expected quality of a signal is predicted (9) for a specific interval to come based on the measured quality of the signal, and a signal is selected (3) based on the predicted quality of the signal. In a time-divided digital system, the quality of a signal is measured from a burst and the quality of the signal is predicted for several frames ahead, for example for 10 frames, based on the measured quality of said burst and one or more bursts preceeding said burst. The predicted quality is compared with a long-term weighted average, which may be the average over 50 frames, for example. If the predicted quality is below the weighted average, the signal is changed.