Test system for calibration of a communication device , said test system comprising at least one signal generation unit , at least one receiver unit and at least one calibration unit , the calibration unit having a calibration output and being connected to the signal generation unit and the receiver unit , wherein the receiver unit is configured to receive a processed signal from the communication device , wherein the processed signal is the output of the communication device in response to a test signal, wherein the receiver unit is further configured to measure the processed signal and to generate measurement data based on the measured signal, wherein the calibration unit is configured to receive the measurement data from the receiver unit , characterized in that the calibration unit is configured to control the signal generation unit to generate the test signal according to a test data pattern, the test signal being fed to a signal input of the communication device , wherein the calibration unit is configured to determine calibration data based on the measurement data and a reference data pattern, the reference data pattern depending on the test data pattern, wherein the calibration data is a single value or a set of values of at least one of the parameters necessary for calibrating a calibratable component of the communication device and the communication device , wherein the calibration unit is configured to compare the measurement data with the reference data pattern and to determine the calibration data by comparing the measurement data with the reference data pattern and using the deviation of the measurement data from the reference data pattern to create the calibration data, and wherein the calibration unit is configured to output the calibration data via the calibration output to the communication device . wherein the receiver unit is configured to receive a processed signal from the communication device , wherein the processed signal is the output of the communication device in response to a test signal, wherein the receiver unit is further configured to measure the processed signal and to generate measurement data based on the measured signal, wherein the calibration unit is configured to receive the measurement data from the receiver unit , characterized in that the calibration unit is configured to control the signal generation unit to generate the test signal according to a test data pattern, the test signal being fed to a signal input of the communication device , wherein the calibration unit is configured to determine calibration data based on the measurement data and a reference data pattern, the reference data pattern depending on the test data pattern, wherein the calibration data is a single value or a set of values of at least one of the parameters necessary for calibrating a calibratable component of the communication device and the communication device , wherein the calibration unit is configured to compare the measurement data with the reference data pattern and to determine the calibration data by comparing the measurement data with the reference data pattern and using the deviation of the measurement data from the reference data pattern to create the calibration data, and wherein the calibration unit is configured to output the calibration data via the calibration output to the communication device . <EOS>