Abstract: A device for placing power control data in a transmission signal has: a generating device for generating power control data as a function of a received signal, a buffer for buffering a formatted transmission data word that contains a power control data field for recording power control data, an inserting device for inserting the generated power control data into the power control data field of the buffered transmission data word, and a modulation device for modulating the transmission data word to form a transmission signal with a transmission power corresponding to the power control data.

Abstract: A method and a device for generating a rate compatible code are described. In the method, a serial-concatenated code at a code rate that can be predetermined is generated. A message signal is partially coded by a first coding stage. A second coding stage is provided on the output side of the first coding stage. The code rate of the coded message signal can be set in a manner which can be predetermined by a controllable puncturer which is disposed in the signal path between the first coding stage and the second coding stage.

Abstract: A method and device for decoding a sequence of physical signals. A Viterbi algorithm is carried out a first time for all physical signals, resulting in a maximum likelihood path, wherein there is one signal value for each physical signal and which has been determined along the entire trellis according to the Viterbi algorithm. A reliability value is determined for each signal value of the maximum likelihood path.

Abstract: A device for spectrally shaping a discrete-value transmission signal, in a radio transmitter, includes one input for receiving an in phase component of the transmission signal and a further input for receiving a quadrature component of the transmission signal. The device also includes a filter circuit with a plurality of multipliers. A multiplexing unit is located in the signal path before the filter circuit, and a demultiplexing unit is located in the signal path after the filter circuit.

Abstract: In a method for deinterleaving a data signal interleaved in blocks in accordance with a prescribed interleaving specification, deinterleaving target addresses are calculated for a first prescribed segment of the data symbols to be deinterleaved, and are stored in a target address memory. The relevant segment of the data symbols is then deinterleaved by using the calculated target addresses. Subsequently, these two steps are repeated until the entire data block has been segmentally deinterleaved.

Abstract: A turbo decoder is used in a method for blockwise decoding a data signal that is error protection coded at a transmitter and that is detected in a receiver. The turbo decoder includes two feedback symbol estimators. In order to calculate its output values, at least one of the symbol estimators executes, with reference to a data block being considered, a plurality of forward and/or backward recursions over subintervals of the data block.

Abstract: A turbo decoder for decoding a data signal transmitted via a disturbed channel has a symbol estimator and a digital signal processor. The symbol estimator performs two symbol estimations, and the DSP performs an interleaving and deinterleaving procedure, within a computing loop of the iterative turbo decoding. A bidirectional interface is provided for transferring data between the symbol estimator and the DSP.

Abstract: Mobile radio receivers in a mobile radio system are synchronized. A first synchronization channel is provided, which has a first frequency and via which a code which is known to all the mobile radio receivers and to all the base stations of the mobile radio system is transmitted with a signal. The transmission from a base station to a mobile radio receiver delays the signal by an unknown time period and the first frequency is displaced by the transmission to a second frequency. The method includes a correlation and sampling of the received signal, digital filtering of the correlated and sampled signal, squaring of the filtered signal, determination of the maximum signal level of the squared signal, estimation of the unknown time period with the maximum signal level, despreading of the received signal with the known code, taking into account the just-estimated time period, and fine-tuning of the second frequency to the first frequency.

Abstract: A device for the bidirectional transfer of data between two processors contains input and output control information memories for storing an item of binary control information for input and output memories. The memories can be accessed by the second processor and, via a DMA channel, by the first processor. The access operations of both processors to these memories are coordinated on the basis of the content of the input and output control information memories.

Abstract: A method for estimating channel parameters of radio channels of a W-CDMA mobile radio system, for example in accordance with the UMTS standard includes transmitting sequences of known symbols between unknown data symbols by a base station. The channel estimation is carried out by a comparison of the received sequences with the known symbols, and the result of the comparison is integrated over a sequence of known symbols.

Abstract: An apparatus for finely synchronizing code signals with an encoded received signal includes a sampling device for sampling the received signal at regular sampling intervals, a pulse shaper for shaping the sampled received signal pulses in order to output a first and second pulse-shaped sample in dependence on an autocorrelation function, a buffer for buffering the two samples, a code signal generator for generating the code signal, correlation devices for correlating the generated code with the two buffered samples to form two correlation values, and an interpolation device for forming an interpolation value as a function of the two pulse-shaped samples and the deviation between the two correlation values.

Abstract: CDMA Receiver. According to one embodiment, a CDMA receiver is provided for receiving a CDMA signal in a multi-subscriber environment. The multi-subscriber environment can include a receiving device for receiving the CDMA signal. Further, the environment can include a Rake receiving circuit for detection of signal components of the CDMA signal which are transmitted via the various signal paths. The environment can also include a channel estimation circuit for estimating channel coefficients of a transmission channel coefficient h of a transmission channel H by means of a predetermined reference data sequence contained in the received CDMA signal. A weighting coefficient calculation device can calculate weighting coefficients for the various signal components of the CDMA signal. Further, the environment can include a weighting circuit for weighting the signal components with the calculaed weighting coefficients. A combiner can combine the weighted signal components to form an estimated received data signal.

Abstract: A method for synchronizing a mobile radio receiver with a frame structure of a radio signal received from a specific base station assumes that each base station transmits a predefined, individual sequence of frame synchronization codes for each frame. The synchronization codes are detected and decoded in the mobile radio receiver and a characteristic code parameter is allocated to them. The sequence transmitted by the specific base station is identified on the basis of the code parameters and the start and end times of the sequence are defined. The mobile radio receiver is frame-synchronized with these times.

Abstract: A turbo decoder for decoding a data signal transmitted via a disturbed channel has a symbol estimator. The symbol estimator contains a computing device, which, with knowledge of the error protection code used at the transmitter end, calculates transition metric values, forward and reverse recursion metric values and the output values (LLR). The computing device includes at least one hardware computing chip constructed of combinatorial logic for generating at least one type of the values.

Abstract: The method and device enable determining the carrier frequency of base stations in the mobile receiver of a cellular mobile radio system working with W-CDMA. The carrier frequency of the primary synchronization channel of the strongest received base station is first searched for by carrying out a non-coherent correlation of the received signal with the primary synchronization code over a very large number of code elements of the signal.

Abstract: The invention relates to a CDMA receiver for receiving, in a multiple subscriber environment, a CDMA signal transmitted with a chip rate by a transmitter via different signal paths of a physical transmission channel.

Abstract: A method is described for estimating channel impulse responses of a mobile radio channel with a broad bandwidth by a code division multiplexing method, and with a synchronization channel continuously transmitting sequences to mobile radio receivers. The sequences are provided for synchronization of each mobile radio receiver and are known to each of the mobile radio receivers. The transmitted sequences have pilot symbols for identifying the synchronization channel, and the pilot symbols are transmitted at points that are known to the receivers within a time slot. When searching for and identifying the synchronization channel, the pilot symbols and, possibly, further symbols and sequences which are known in the receivers, are evaluated to estimate the delay times and the complex amplitudes, of the mobile radio channel responses.

Abstract: A RAKE receiver is configured for receiving spread-coded signals in the FDD and TDD modes. The RAKE receiver contains two or more RAKE fingers. The RAKE fingers have an equalizer for equalization of the signals that are processed in the RAKE fingers. Equalizer coefficients are calculated selectively for the FDD and TDD modes, by a calculation unit. In the TDD mode, the equalizer coefficients are calculated using a multiple subscriber method for each chip in the signals to be equalized.

Abstract: A method for estimating a channel impulse response of a mobile radio channel is described. The mobile radio channel is accessed over a wide bandwidth by a code division multiplex method. A second mobile radio channel continuously transmits sequences to a multiplicity of mobile radio receivers, and the sequences are known to each of the multiplicity of mobile radio receivers. The delay parameters of the mobile radio channel are estimated using the sequences transmitted via the second mobile radio channel. The mobile radio receiver is adjusted in accordance with the delay parameters estimated and weighting factors of the mobile radio channel are determined.

Abstract: In a method for multi-subscriber detection using a RAKE receiver structure, one or more RAKE fingers is or are deactivated in order to reduce the power consumption of the RAKE receiver structure during operation. This makes it possible to considerably reduce the signal processing complexity for equalization, since only those energy-relevant areas of the channel impulse response which are required to ensure a required quality of service (QoS) are included in the JD algorithm.