Robert Boschgmbh

Ant Nachrichtentechnik Gmbh

Telefonaktiebolaget Lm Ericsson (publ)

Franz-Josef Hagmanns

Thomas Alberty

Volker Hespelt

Waldemar Hauk

A transmitter () for transmitting radio signals comprising a digital signal source (), a compensation unit (), two digit al-to-analogue converters () and (), an analogue modulator (), an amplifier () an antenna () connected to the amplifier (), the transmitter further comprises a front-end unit () connected to an estimator (). Said front-end unit () comprises a mixer operably () connected to a local oscillator (), an analogue-to-digital converter () for processing signal received from the mixer (), a first digital filter () for converting signal received from the analogue-to-digital converter () to a baseband signal, an adaptive digital filter () operable to time-synchronise its output signal (z(k)) to a reference signal (r(k)) and to remove linear distortions from the signal received from the first digital filter.

Apparatus for monitoring non-linear distortions of radio signals and a method therefor

To calibrate a transmitter and/or sender for controlling a beam forming network, each of the control signals is divided into a plurality of frequency segments. The control signal of each frequency segment is multiplied by complex coefficients so that the transmitter output signals, after passing through a reference receiver, are identical to the respective control signals. A similar adjustment is performed for the receive direction. The method and the device allow the same beam characteristic.

Calibration method and arrangement

Method for carrier-frequency synchronization

Reliablity-controlled data reception in receivers for TDMA mobile radio

Kalman filter for channel impulse-response adaption in receivers for

Growing community of inventors

Backnang, Germany

Franz-Josef Hagmanns