Infineon Technologies Ag

Martin Krüger

Xiaofeng Wu

Bin Yang

Claudiu Krakowski

Ralf Heddergott

Bertram Gunzelmann

Burkhard Becker

Dietmar Wenzel

Stefan Herzinger

Holger Neuhaus

Michael Weber

Hartmut Wilhelm

Ralf Hartmann

Michael Cujé

Stefan Eibl

Burkard Becker

A device for scaling and quantization of digital soft output values (s) from an equalizer has a control loop for controlling a statistical parameter (&#x3b8;) for the scaled and quantized soft output values (s), which contains a calculation unit () for calculation of the statistical parameter (&#x3b8;), and a control unit () for calculation of a scaling factor (c) for scaling the soft output values (s) from the equalizer on the basis of the statistical parameter (&#x3b8;).

Device and method for control scaling and quantization of soft output values from an equalizer

In order to compensate for a frequency offset or a change in the phase of the transmission channel over time during mobile radio transmission of data symbols, the data symbols are transmitted by way of carrier-frequency, modulated data bursts. Sample values of the received signal, which are known in advance and correspond to first and second symbols, are evaluated in order to estimate the frequency offset or the change in the phase of the transmission channel over time. These first and second symbols are transmitted with a defined phase angle by way of the data burst, and are arranged separated from one another in the data burst. Edge symbols in a data burst are advantageously used as first and second symbols, or as a symbol pair, for estimation.

Method and receiving unit for compensation for a frequency offset and/or for a change in the phase of a transmission channel over time by receiver-end evaluation of edge symbols of a received data burst

The proposed iterative method concurrently calculates maximum likelihood estimated values for the channel coefficients (h, . . . , h; &#x3b8;) and the DC offset (d; &#x3b8;) on the basis of a training sequence (TSC) in a TDMA mobile communications system. The SAGE algorithm leads to two recursion formulae, by means of which the iterative calculation of estimated values for the channel coefficients (h, . . . , h; &#x3b8;) and for the DC offset (d; &#x3b8;) is provided.

Maximum likelihood estimation of the channel coefficients and of the DC offset in a digital baseband signal of a radio receiver using the SAGE algorithm

A method for equalization of a signal is provided, wherein the equalization is of a signal that is transmitted via a data channel based on the DF method. The method takes account of at least one interference channel, and includes processing of at least two trellis diagrams in each time unit, with the states of at least one of the trellis diagrams describing the data channel. A DF contribution that is used for processing of this trellis diagram includes information about at least one interference channel.

Method for equalization of a data signal taking account of interference channels

In a method for correlative estimation of a mobile radio channel on the basis of a training sequence (TS) which is transmitted via the mobile radio channel, a sequence of P received symbols is correlated with a subsequence of length P of the training sequence, in order to calculate a first estimated channel coefficient (&#x125;). Furthermore, the same sequence of P received symbols is correlated with at least some of the subsequences of the training sequence (TS) shifted through &#xb1;1, &#xb1;2, . . . , &#xb1;(Lt&#x2212;1) symbol positions, in order to calculate a number of further estimated channel coefficients (&#x125;,&#x125;, . . . ,&#x125;).

Method and apparatus for correlative estimation of a mobile radio channel

In a method to compensate for a step DC disturbance () in a baseband signal in a homodyne radio receiver, the time profile of the step DC disturbance within a burst is determined. In order to produce a step-corrected baseband signal, the determined time profile () is then calculated from the digitized baseband signal.

Method to compensate for a step DC disturbance in a digital baseband signal in a homodyne radio receiver

Only a single, standard-independent clock rate is generated in a signal processor or a signal processing structure, and correspondingly only precisely one clock frequency generator is then arranged on the chip. The signal processing path includes at least one controllable, asynchronous decimator for transposing the reception signals present in a uniform time frame into a respective standard-specific time frame. This enables signals of a variety of mobile phone standards to be processed.

Signal processor and method for the system-independent digital evaluation of mobile communications reception signals of various mobile phone standards

In a method for error correcting a data signal that is transmitted via a channel and contains data blocks with associated error checking information, the data signal is first equalized, with calculated soft-bit information. In a subsequent step, the error checking information is evaluated with respect to the data block. If the evaluation of the error checking information shows that a single bit error is present in one message bit, the single bit error is corrected only when a condition that is dependent on the soft-bit information is satisfied.

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Munich, Germany

Martin Krüger