Patent ID: 7929456

Claim:
A circuit for a communication device, the communication device comprising transmission means that are provided for communicating with a further device, wherein the circuit comprises: a transmitter designed to receive transmission data, to cooperate with the transmission means, to release to the transmission means a transmission data signal that represents the transmission data, to produce a modulated carrier signal dependent on the transmission data, and to release the modulated carrier signal as the transmission data signal, a receiver designed to cooperate with the transmission means, to receive from the transmission means a reception data signal and to provide reception data that represent the reception data signal, and control means designed to control the transmitter for releasing the transmission data signal simultaneous to the receiving of the reception data signal by means of the receiver characterized by signal parameter determining means designed to receive the transmission data signal, to determine the signal level, the phase or frequency of the transmission data signal, to generate and release a first parameter representation signal that represents the signal level, the phase or frequency of the transmission data signal, to receive the reception data signal, to determine the signal level, the phase or frequency of the reception data, and to generate and to release a second parameter representation signal that represents the signal level, the phase or frequency of the reception data signal, wherein the control means are designed to receive the first parameter representation signal and the second parameter representation signal and to release, dependent on the parameter representation signals, a signal parameter control signal meant for the transmitter such that a difference between the determined signal levels, phases or frequencies of the reception and transmission data signals is reduced, and wherein the transmitter is designed to produce the modulated carrier signal also dependent on the signal parameter control signal.