Abstract: Method for synchronising mobile equipment in a CDMA system comprising a plurality of base stations (11) for communicating with the mobile equipment (12). The base stations (11) are mutually synchronised, and each base station (11) has a synchronisation channel transmit timing offset within a synchronisation time slot (20). The method comprises the step of synchronising the mobile equipment (12) by matching a synchronisation code in the synchronisation time slot (20). Also the following steps are executed by the method: scanning a base radio signal (13) during at least one frame (15) for detecting a signal portion with predetermined characteristics, such as received power peaks (23), the signal portion not being the synchronisation code; deriving timing information associated with the CDMA system from the signal portion; and starting the synchronisation step of the mobile equipment (12) using the timing information.

Abstract: A method of and a digital data recovery circuit (1) for extracting digital data from an analog data signal in a Time Division Multiple Access (TDMA) communications system, wherein the analog data signal of a communications link is exchanged in bursts or time slots. The circuit (1) comprises analog-to-digital (ADC) converter means (4), digital filter means (6) for providing a threshold or slice level, and digital comparator means (5) for comparing the digital data signal and the slice level for providing the recovered digital data. The digital filter means (6) comprise storage means (15) for digitally adjusting the filter time constants and slice level for each burst or time slot independently in accordance with specific settings applicable to a communications link associated with a burst or time slot.

Abstract: Method for synchronising mobile equipment in a CDMA system comprising a plurality of base stations (11) for communicating with the mobile equipment (12). The base stations (11) are mutually synchronised, and each base station (11) has a synchronisation channel transmit timing offset within a synchronisation time slot (20). The method comprises the step of synchronising the mobile equipment (12) by matching a synchronisation code in the synchronisation time slot (20). Also the following steps are executed by the method: scanning a base radio signal (13) during at least one frame (15) for detecting a signal portion with predetermined characteristics, such as received power peaks (23), the signal portion not being the synchronisation code; deriving timing information associated with the CDMA system from the signal portion; and starting the synchronisation step of the mobile equipment (12) using the timing information.

Abstract: A packet switched data network (10) having data transfer devices (2, 3) providing an undetermined delay in transferring data packets. The data network (10) comprises at least one data transfer bypass device (11, 12) arranged for transferring data packets with a predetermined delay. The or each data transfer by pass device (11, 12) being operatively connected for bypassing at least one data transfer device (2, 3) having an undetermined data packet transfer delay. The invention is particularly suitable for use with radio communication networks for transferring synchronisation data packets.

Abstract: An adaptive automatic gain control loop in a radio receiver includes an amplifier with an adjustable gain to variably increase or decrease the signal level of the received signal. Plural data blocks are received, with each data block potentially having a different signal level when received. Before or at the very beginning when substantive data in a data block are processed in the amplifier, the gain of that amplifier is rapidly adjusted or preset to a predetermined signal level for that data block. By adapting the gain of the amplifier before or just as the data in the block are processed by the amplifier to an appropriate level, the received signal can be adjusted to a desired dynamic range. For example, by adapting the received signal level to the dynamic range of an analog-to-digital converter of a receiver, e.g., a UTRA/TDD or TD-SCDMA receiver, the bit error rate at the start of the data block is decreased.