Patent ID: 9397396
Filing Date: 2016-07-19
CPC Classification: H01Q,H03F,H04B

Claim Text:
1. A radio system for relaying packetized radio signals, the radio system comprising: at least one transmit path adapted to forward a packetized payload signal as a transmit signal, the at least one transmit path comprising a coupler for extracting a coupled transmit signal out of the transmit signal, a single synchronization unit for extracting a temporal order of the packetized payload signal and providing a clocking signal from the packetized payload signal, a base band calibration signal generator adapted to insert a continuous base band calibration signal into the packetized payload signal, the base band calibration signal being synchronized to the clocking signal, so that the continuous base band signal is synchronized to the packetized payload signal a digital predistortion unit adapted to apply a digital predistortion to the packetized payload signal for linearising a transfer characteristic of the radio system, a calibration unit adapted to apply phase and amplitude changes to the at least one transmit path, a feedback path commonly used by the digital predistortion unit and the calibration unit for feeding back a feedback signal, wherein at least one of the phase and amplitude changes and the digital predistortion is adapted using the said feedback signal a calibration signal modulator for transforming the base band calibration signal into a calibration signal for calibrating the feedback path, wherein the digital predistortion unit updates the digital predistortion in response to the feedback signal, wherein the calibration signal is forwarded as the feedback signal, wherein the calibration signal comprises a signal change portion pertaining to the calibration of the phase and amplitude changes, wherein the signal change portion is provided in at least one of a frequency outside of a frequency band used in connection with the digital predistortion or in the form of a narrow band signal of vanishing value.