Abstract: A device for carrying out search procedures includes a memory for storing a digital received data sequence, and a memory storing a predetermined correlation data sequence. A correlation device has a first section, in which sequence elements of the received data sequence are correlated with sequence elements of the correlation data sequence. A variable number K of sequence element correlation results are summed in the second section, in order to form an accumulated correlation result.

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: In a method for synchronizing a mobile radio receiver with a radio signal time slot structure a first portion, detected during a first time slot period, and a second portion, detected during a later time slot period, of a received time slot synchronization code sequence is correlated with the known time slot synchronization code sequence sent out by the base station in the receiver. From the two obtained coxrelation results, the position of the time slots in time is determined.

Abstract: A digital data signal to be transmitted is split into a number of subsidiary data signals by a data signal splitting device and is output by a timeslot data output device in a particular timeslot of a TDMA frame made up of a plurality of timeslots. A channeling device is used to impress a CDMA code onto each subsidiary data signal which is output in the particular timeslot. A device for processing a digital data signal in a CDMA mobile radio transmitter is also provided.

Abstract: To achieve an improved disparate error protection in the transmission of coded symbols of an information stream, the information stream is supplied to a multiplicity of coding branches for coding, and is supplied in parallel, to a puncturing and multiplexing unit. Symbols of different quality classes are fed into each coding branch using a demultiplexer. An interleaver follows at least one demultiplexer for generating error protection for the filtered symbols. The symbols, which may possibly be interleaved, are coded in each coding branch and are supplied to the puncturing and multiplexing unit. The puncturing and multiplexing unit sets a predetermined coding rate.

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: 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: Convolutional codes are decoded by calculating, for uncoded and coded symbols, a first and/or second item of reliability information (&Lgr;u and &Lgr;c respectively). The item of reliability information is representative of the probability that the considered nth uncoded or coded symbol is equal to a value i of the symbol set, under the condition that a specific sequence of received coded symbols is present. An approximate expression is proposed for calculating the second item of reliability information.