Abstract: A method and device for determining a temporal point of reference when receiving a radio signal, especially in a mobile radio system. The radio signal is received with a time-variant received strength in a temporally indeterminate manner. A received-strength determining unit determines the received strength as a function of the time of reception for a plurality of evaluation time intervals, a time base being defined repetitively for each of the evaluation time intervals. An averaging unit averages the received strength over the evaluation time intervals, the received strengths in each case resulting in a mean time-dependent received strength at identical times with respect to the individual time bases. A time-determining unit determines the temporal point of reference from the mean received strength as a function of time.

Abstract: A TDMA receiver, e.g. mobile radio, is configured to be adaptable to transmission conditions. A redundantly coded message [lacuna] which is contained in a plurality of bursts of a frame sequence is received by the receiver. Essential functional groups of the receiver are disconnected from the power supply after the decoding of information of a message block and before the next message block arrives. Only a specific number of bursts is decoded, but, in the event of unsuccessful decoding, the system is switched over to decoding a larger number of the bursts.

Abstract: A combiner for a radio receiving signal which receives signals having various signal paths of a digital radio transmitter, particularly a mobile transmitter. The combiner is designed so it allows maximum power gain in broadband systems and can also be used in systems which have pulse or discontinuous transmission. A correlator is provided at the receiver in every signal path. Frequency converters are also in each signal path. Following the frequency converter and following each of the correlators there is provided a metric table in each path which had been calculated in accordance with the respective line model obtained at the receiver. The output values formed from the metric tables and individual signals are combined and supplied to a Viterbi demodulator which produces the corrected output signal.

Abstract: For the employment of an FEC method in systems of a variety of types, the serial binary data stream to be transmitted is supplied to a means for rate matching and for serial-to-parallel conversion wherein, first, the data rate is increased to the transmission rate upon formation of free locations for the acceptance of redundancy bits and, second, a corresponding plurality of parallel data streams are generated from the serial data stream, respectively one half of said parallel data streams forming the I-channel and the other half forming the Q-channel. The redundancy locations lie in the least significant bits of the I-channel and Q-channel. The more significant bits of the I-channel and the Q-channel directly control the appertaining inputs of a quadrature modulator, whereas the least significant bit is supplied to the appertaining input via a respective multiplexer.