Abstract: The present invention relates to a receiver and to an apparatus for receiving a data signal, in particular for receiving a data signal having a channel profile.

Abstract: In order to determine the optimal sampling point for a series of spread-coded data, received by a radio, a correlation data series is used that is produced by convoluting the channel impulse response of the transmission channel with the spread data series, known at the receiving end. The channel impulse response is determined using a channel estimator according to a training sequence. An early-late correlator correlates the correlation data series with the received data in order to generate a correction signal for the optimal sampling point.

Abstract: In the method according to the invention for searching for the carrier frequency f of a mobile radio transmitter in a mobile radio receiver, two or more values e(k) of the spectral input power are measured at different discrete test frequencies fk, where fk<fk+1. The maximum e(kmax) of the values e(k) and of the associated test frequency fkmax is then searched for. An estimated value f?, which is characteristic of the sought carrier frequency f, can be determined from knowledge of the values of at least one value pair e(k1) and e(k2) where k1<kmax<k2, and of the specific test frequency fkmax.

Abstract: In a method and an apparatus (1) for transmission diversity mode detection in a mobile radio receiver using a decision function, the decision function which is used for detection of the transmission diversity mode is based on the coherent processing of two successive input signal data tuples {r(k);r(k+1)} and {r(k+2);r(k+3)} and recording of a phase offset between the two tuples.

Abstract: An apparatus for readjustment of a sampling time in a radio receiver includes a means for determination of any sampling time error in a discrete-value received signal that emits a sampling time error signal. A filter arrangement is provided that includes a multi-rate filter that filters the sampling time error signal. A correction element receives the discrete-value received signal and the filtered sampling time error signal, and emits a discrete-value received signal whose timing has been corrected in accordance with the sampling time error.

Abstract: A method for synchronization of a mobile radio receiver having a time slot structure for a radio signal is disclosed. A data stream received by the mobile radio receiver is filtered in a filter, thereby producing a decision sequence of received data as a set of maximum possible determined time slot boundaries. The decision sequence is processed in a two-step method such that, in a first method step, a subset is selected from the decision sequence and, then, in a second method step, the elements of said subset are averaged over time, with the time slot boundary which is used for synchronization being obtained as the result of this averaging process. In this case, the subset is selected using statistical characteristics of those signal sample values that are associated with a time slot boundary, and of those signal sample values which are not associated with a time slot boundary.

Abstract: In a method for carrying out a plurality of correlation procedures in a mobile radio system, sample values which have been written to a data memory (DS) are read using a predetermined reading rule. Two correlation procedures are carried out on the basis of the sample values which have been read. This reading rule is in this case independent of the correlation procedure to be carried out.

Abstract: In a method for synchronization of a receiver to a transmitter which periodically transmits a sequence which is known in the receiver, a subset of possible synchronization times is determined in a first selection process by repeated correlation of the received signal with the known sequence and comparison of the correlation responses, as calculated for the correlations, with a threshold value. The threshold value is in this case varied adaptively as a function of at least one parameter which is measured during the correlations.

Abstract: A device (11) for carrying out a correlation, having a data memory (12) for storage of a sequence of sample values (110), having an address generator (13) for production of addresses for reading a data word (111), in which the sequence of sample values in the data word (111) need not be chronological, having a code generator (15) for production of a correlation word (112) from sequence elements in a correlation sequence, with the sequence elements being arranged in the correlation word (112) in a sequence which depends on the data word (111), and having a correlator unit (14).

Abstract: In a method for synchronization of a mobile radio receiver to a base station, in which a verification step or a plurality of verification steps is or are also carried out in addition to the synchronization steps and one or more identification step or steps which may be present, at least one of the verification steps is carried out in parallel with a synchronization step and/or with an identification step.

Abstract: In a method for identification of a multiple antenna transmission mode in a radio receiver, at least two antenna-decoupled data streams (s0, s1) are produced by means of an antenna decoupling unit in the receiver. Respective first variables (p0, p1) are calculated for both data streams, and are dependent on the phase change between the data in the respective data stream. An evaluation unit uses these first variables as the basis to decide whether a multiple antenna transmission mode is being used in the transmitter.

Abstract: A method for adapting threshold values in an electronic signal processing device, involving a plurality of different threshold values being calculated and being compared with processing variables calculated in the signal processing device, involves calculation of a common correction value which is valid for the various threshold values. The threshold values are then set on the basis of the common correction value.

Abstract: In a method for synchronization of a mobile radio receiver to a base station, the received signal is sampled using oversampling, by which means sample values are obtained from different sampling phases. The oversampled signal is correlated with a local code, with sample values that are associated with a first sampling phase being processed with a frequency offset with respect to sample values that are associated with a second sampling phase.

Abstract: A discrete sampling control signal, which influences the sampling time, from a sampling phase selection element is calibrated by definition of quantization intervals for a sampling time error signal. For this purpose, a received signal is shifted through a series of time shifts ?i in the signal path upstream of the sampling phase selection element. The sampling time errors ei associated with the respective time shifts ?i are measured. The quantization steps of the sampling control signal that are suitable for the sampling phase selection element are then determined from the relationship obtained between ?i and ei.

Abstract: In order to determine the optimal sampling point for a series of spread-coded data, received by a radio, a correlation data series is used that is produced by convoluting the channel impulse response of the transmission channel with the spread data series, known at the receiving end. The channel impulse response is determined using a channel estimator according to a training sequence. An early-late correlator correlates the correlation data series with the received data in order to generate a correction signal for the optimal sampling point.

Abstract: In the method according to the invention for searching for the carrier frequency f of a mobile radio transmitter in a mobile radio receiver, two or more values e(k) of the spectral input power are measured at different discrete test frequencies fk, where fk<fk+1. The maximum e(kmax) of the values e(k) and of the associated test frequency fkmax is then searched for. An estimated value f?, which is characteristic of the sought carrier frequency f, can be determined from knowledge of the values of at least one value pair e(k1) and e(k2) where k1<kmax<k2, and of the specific test frequency fkmax.

Abstract: A memory device has a read amplifier with either a variable input resistance and/or the input connections that may be linked to one or both poles of a voltage source using one or more transistors. Additionally, or alternatively the read amplifier is also applied in the decoder devices for choosing the memory cell to he read out or to be written to.

Abstract: A data memory including a main data memory having a plurality of data memory units, a redundancy data memory that includes a plurality of redundancy data memory units for the replacement of defective data memory units of the main data memory, and a redundancy control logic for controlling the access to the redundancy data memory, the main data memory and the redundancy data memory being connected to a data bus in parallel with one another via data lines, and the main data memory and the redundancy control logic being connected, in parallel with one another, via address lines, to an address bus for the addressing of data memory units in the data memory.

Abstract: The present invention relates to a circuit arrangement for a composite fuel cell system comprising a plurality of individual fuel cells connected in series, the voltage of the individual fuel cells being monitored, in which case components are present which enable the individual fuel cells to be bridged in the sense of a low-resistance parallel circuit. Furthermore, the invention relates to a method for operating a circuit arrangement of this type, in which case the fuel cells are bridged if the magnitude of their voltage falls below a specific threshold value or if the sign of their voltage has changed relative to normal operation, or alternatively in which case the components are controllable switches which are driven if the composite fuel cell system is intended to be discharged.

Abstract: In a voltage measuring circuit for a composite fuel cell system, the potential of at least one point of the composite fuel cell system is detected by tapping the potential of such point, and feeding it to an input of an arrangement for evaluating the voltage. A potential shifting element is interposed between the at least one point of the composite fuel cell system and the input of the arrangement, which element is connected in series with a current sink or current source. A voltage supply circuit for such voltage measuring circuit of a composite fuel cell system comprising a plurality of individual fuel cells connected in series includes at least one voltage stabilization element connected in parallel with the circuit which is to be supplied with voltage by the composite fuel cell system. At least one current source or current sink is connected in series with this parallel circuit.