Abstract: The invention is related to a device comprising: generating unit configured to generate a feedback signal; setting unit configured to set a predetermined frequency shift to the feedback signal; evaluating unit configured to evaluate distortion caused in a transmission chain on the basis of the frequency shifted feedback signal; adapting unit configured to adapt quadrature modulation pre-distortion algorithms of the transmission chain; wherein the setting unit is further configured to set the frequency of the feedback signal to an original frequency value; wherein the evaluating unit is further configured to evaluate distortion caused in the feedback chain based on the feedback signal having the original frequency; wherein the adapting unit is further configured to adapt quadrature demodulation pre-distortion algorithms of the feedback chain; and wherein the adapting unit is further configured to adapt other pre-distortion algorithms.

Abstract: A transmitter compensates for the non-linearities within a transmission chain. The transmitter includes, for instance, a first forming device for forming, on the basis of at least one set of signal properties, at least one state expansion vector comprising quantities characterizing a signal. The transmitter includes a modifier for modifying the signal characterizing quantities of at least one state expansion vector with the at least one time-domain compensation parameter vector and with the at least one frequency-domain compensation parameter vector to form a pre-distorted signal. The transmitter includes a second forming device for forming a feedback signal from an output signal of a transmission chain. The transmitter includes an adapter for adapting at least one time-domain compensation parameter vector for adapting at least one frequency-domain compensation parameter vector based on a residual error between a transmit signal and the feedback signal.

Abstract: A transmitter includes generating unit configured to generate a feedback signal and an analyzing unit configured to analyze transmission quality in a time domain and in a frequency domain by using the feedback signal. The transmitter also includes an adapting unit configured to adapt the pre-distorter if the transmission quality is below the threshold.

Abstract: The invention is related to a device comprising: generating unit configured to generate a feedback signal; setting unit configured to set a predetermined frequency shift to the feedback signal; evaluating unit configured to evaluate distortion caused in a transmission chain on the basis of the frequency shifted feedback signal; adapting unit configured to adapt quadrature modulation pre-distortion algorithms of the transmission chain; wherein the setting unit is further configured to set the frequency of the feedback signal to an original frequency value; wherein the evaluating unit is further configured to evaluate distortion caused in the feedback chain based on the feedback signal having the original frequency; wherein the adapting unit is further configured to adapt quadrature demodulation pre-distortion algorithms of the feedback chain; and wherein the adapting unit is further configured to adapt other pre-distortion algorithms.

Abstract: A transmitter compensates for the non-linearities within a transmission chain. The transmitter includes, for instance, a first forming device for forming, on the basis of at least one set of signal properties, at least one state expansion vector comprising quantities characterizing a signal. The transmitter includes a modifier for modifying the signal characterizing quantities of at least one state expansion vector with the at least one time-domain compensation parameter vector and with the at least one frequency-domain compensation parameter vector to form a pre-distorted signal. The transmitter includes a second forming device for forming a feedback signal from an output signal of a transmission chain. The transmitter includes an adapter for adapting at least one time-domain compensation parameter vector for adapting at least one frequency-domain compensation parameter vector based on a residual error between a transmit signal and the feedback signal.

Abstract: A transmitter compensates for the non-linearities within a transmission chain. The transmitter includes, for instance, a first forming device for forming, on the basis of at least one set of signal properties, at least one state expansion vector comprising quantities characterizing a signal. The transmitter includes a modifier for modifying the signal characterizing quantities of at least one state expansion vector with the at least one time-domain compensation parameter vector and with the at least one frequency-domain compensation parameter vector to form a pre-distorted signal. The transmitter includes a second forming device for forming a feedback signal from an output signal of a transmission chain. The transmitter includes an adapter for adapting at least one time-domain compensation parameter vector for adapting at least one frequency-domain compensation parameter vector based on a residual error between a transmit signal and the feedback signal.

Abstract: A transmitter compensates for the non-linearities within a transmission chain. The transmitter includes, for instance, a first forming device for forming, on the basis of at least one set of signal properties, at least one state expansion vector comprising quantities characterizing a signal. The transmitter includes a modifier for modifying the signal characterizing quantities of at least one state expansion vector with the at least one time-domain compensation parameter vector and with the at least one frequency-domain compensation parameter vector to form a pre-distorted signal. The transmitter includes a second forming device for forming a feedback signal from an output signal of a transmission chain. The transmitter includes an adapter for adapting at least one time-domain compensation parameter vector for adapting at least one frequency-domain compensation parameter vector based on a residual error between a transmit signal and the feedback signal.

Abstract: A method for restricting a signal in a radio transmitter, which method comprises setting a threshold value and a value sample interval for the signal, searching the modulated signal for maximum values exceeding the threshold value, and determining the instant of occurrence of the maximum value that exceeded the threshold value, searching the modulated signal for additional sample values exceeding the threshold value at a distance of one or more value sample intervals from the moment of occurrence of at least one maximum value, forming, by means of the maximum values and additional sample values that were searched for, a signal that represents the part of the modulated signal that exceeds the threshold value, and subtracting from the modulated signal the formed signal representing the part that exceeds the threshold value.