Abstract: The invention relates to an apparatus for preprocessing of pilot symbols for channel estimation. The pilot symbols are transmitted from a base station and are received by a mobile radio, and are available in the mobile radio. The apparatus includes a low-pass filter apparatus for filtering the received pilot symbols, with a setting of the low-pass filter apparatus depending on the relative speed of the mobile radio with respect to the base station.

Abstract: A description is given of a transmitter including a baseband chip, a radio frequency chip and an interface unit coupling the baseband chip and the radio frequency chip. The radio frequency chip includes a modulation unit configured to modulate multiple data streams, wherein each of the data streams is assigned to a subcarrier having a frequency differing from the frequencies of the other subcarriers.

Abstract: A mobile station sends to the base stations a bit vector which contains weighting factors (w1, w2) for the amplitudes and/or the phases of the signals to be emitted from the antennas. The bit vector is updated by changing one bit position for each time slot, and by transmitting this from the mobile station to the base station in the form of a bit (e.g., an FBI (feedback information) bit). A trellis diagram can be set up comprising the possible states of the bit vector and the possible state changes (branches) and the Viterbi algorithm can be used for the determination of the weighting factors actually used by the base station, taking account of both the currently transmitted training symbols and the previously transmitted training symbols.

Abstract: The present invention relates generally to a converter circuit with a limiter to convert an analog reception signal into a value-discrete limiter signal. An evaluation circuit determines a zero crossing distance signal from the temporal distances between successive zero crossings of the limiter signal. A synthesis circuit calculates a digital processing signal whose zero crossings correspond to those of the limiter signal and whose pulse shape has a smaller spectral width than a rectangular pulse.

Abstract: A digital signal processing structure includes a processing unit configured to perform a fast Fourier transformation of length N on signal samples of word length WL, wherein the processing unit is configured to vary during operation the values of N and WL_in in a reverse fashion with respect to one another. A frequency-domain equalizer includes a length N, wherein the value of N is variable during operation.

Abstract: In the method, the received spread-coded signal sequence rk(i) is first of all correlated with the spread-coded training symbol sequence in a correlator (24) so as to counteract the influence of the transmitted training symbols. The signal sequence which results from the correlation process is then despread in a despreading apparatus (21, 22). The despread signal sequence is integrated over a number (N_MF) of signal values, with the number (N_MF) being set as a function of the channel dynamic range (?). The sequence of data symbols produced in this way is filtered with fixed or variable filter coefficients in a digital filter (25) in order to produce channel estimation values ({tilde over (H)}(l)).

Abstract: An apparatus is used for outputting an input data block comprising a plurality of bits as an output data block with at least one puncturing or with at least one repetition of at least one bit. The apparatus comprises an association unit for associating the bits in the input data block with the bits in the output data block on the basis of an alterable puncturing or repetition pattern (incw(k)). The association unit is a hardware circuit which is designed to execute both puncturing and repetitive coding.

Abstract: The method is based on a signal interval (DB) which comprises a first part (ET) (which is modulated using a first modulation method (GFSK)) of the signal interval and a second part (which is modulated using a second modulation method (DMPSK)) of the signal interval. The channel parameters (c(i)) relating to the second part (which is modulated using the second modulation method) of the signal interval are determined using a received data signal (a(i); p(i)) from the first part (ET) of the signal interval (DB).

Abstract: The present invention relates generally to a converter circuit with a limiter to convert an analog reception signal into a value-discrete limiter signal. An evaluation circuit determines a zero crossing distance signal from the temporal distances between successive zero crossings of the limiter signal. A synthesis circuit calculates a digital processing signal whose zero crossings correspond to those of the limiter signal and whose pulse shape has a smaller spectral width than a rectangular pulse.

Abstract: In a method for estimating a sequence of input data symbols of a CPFSK-modulated data signal transmitted via a faulty channel, in the course of an ACS operation for calculating a transition metric value, an estimated value is determined for the replacement symbol occurring during the linear approximation of the CPFSK. That estimated value is considered in calculating the transition metric value.

Abstract: The invention relates to an apparatus for preprocessing of pilot symbols for channel estimation. The pilot symbols are transmitted from a base station and are received by a mobile radio, and are available in the mobile radio. The apparatus includes a low-pass filter apparatus for filtering the received pilot symbols, with a setting of the low-pass filter apparatus depending on the relative speed of the mobile radio with respect to the base station.

Abstract: An apparatus is used for outputting an input data block comprising a plurality of bits as an output data block with at least one puncturing or with at least one repetition of at least one bit. The apparatus comprises an association unit for associating the bits in the input data block with the bits in the output data block on the basis of an alterable puncturing or repetition pattern (incw(k)). The association unit is a hardware circuit which is designed to execute both puncturing and repetitive coding.

Abstract: A mobile station sends to the base stations a bit vector which contains weighting factors (w1, w2) for the amplitudes and/or the phases of the signals to be emitted from the antennas. The bit vector is updated by changing one bit position for each time slot, and by transmitting this from the mobile station to the base station in the form of a bit (e.g., an FBI bit). A trellis diagram can be set up comprising the possible states of the bit vector and the possible state changes (branches) and the Viterbi algorithm can be used for the determination of the weighting factors actually used by the base station, taking account of both the currently transmitted training symbols and the previously transmitted training symbols.

Abstract: The invention relates to a device for preventing shifting of a vibration-loaded seal retained between two components braced against one another with the aid of clamping means, in particular to prevent shifting of a seal retained between a plug strip and a housing half shell of a motor vehicle clutch control element. This device includes stop faces for the seal, which act in a plane essentially perpendicular to the prestressing direction and which are embodied at least in part on the clamping means.

Abstract: In the method, the received spread-coded signal sequence rk(i) is first of all correlated with the spread-coded training symbol sequence in a correlator (24) so as to counteract the influence of the transmitted training symbols. The signal sequence which results from the correlation process is then despread in a despreading apparatus (21, 22). The despread signal sequence is integrated over a number (N_MF) of signal values, with the number (N_MF) being set as a function of the channel dynamic range (?). The sequence of data symbols produced in this way is filtered with fixed or variable filter coefficients in a digital filter (25) in order to produce channel estimation values ({tilde over (H)}(l)).

Abstract: In a method for variable weighting of channel coefficients for a RAKE receiver, at least one variable that is characteristic of a transmitter and/or transmission channel and/or receiver characteristic is assessed. A correction factor is determined, which is dependent on the assessment result. The channel coefficients are multiplied by the correction factor, and the corrected channel coefficients are used as the basis for equalization in the RAKE receiver.

Abstract: A method for calculation of path weights for the equalization of a data signal that is transmitted via a data channel whose power is regulated in a RAKE receiver is disclosed. In the method, at least one uncorrected path weight is calculated for the data signal that is transmitted via the data channel, using channel estimation results that have been obtained on the basis of a common pilot channel. The uncorrected path weight is corrected by multiplying it by a correction factor that contains a ratio of a data-channel-specific gain estimation to a pilot-channel-based gain estimation.

Abstract: In a method for demodulating a CPFSK-modulated signal, the n−1-th substitute symbol an−1 which occurs in the linear approximation of the CPFSK is estimated in order to determine an n-th input data symbol dn on which the CPFSK modulation is based. The n−1-th substitute symbol an−1 is in this case estimated on the basis of the previously determined n−1-th input data symbol {circumflex over (d)}n−1.

Abstract: The invention relates to a device for preventing shifting of a vibration-loaded seal, which is retained between two components braced against one another with the aid of clamping means (18), in particular to prevent shifting of a seal (4) retained between a plug strip (14) and a housing half shell (1) of a motor vehicle clutch control element.

Abstract: The invention concerns a device for connecting vibrating components having different electric potentials, in particular for connecting a stator housing (8) for an electric motor (1) with a housing (4) for control electronics (6) inside a clutch actuator of a motor vehicle, containing electrical contact means (30) for establishing an electrically conductive connection between the components, and means (26) for establishing its mechanical connection.