TRANSMITTER FOR TRANSMITTING SIGNALS OVER RADIO CHANNELS AND METHOD FOR TRANSMITTING SIGNALS OVER RADIO CHANNELS

摘要

A transmitter for sending signals over wireless channels and a method of sending signals over wireless channels are described. The transmitter and the method are used to determine a transfer characteristic of an amplifier in the transmitter. Test signals are input at preset times into OFDM signals to be transmitted, and then test signals amplified by the amplifier are compared with test signals buffered in a measurement module to determine the transfer characteristic of the amplifier. This transfer characteristic of the amplifier is used by a predistorter to predistort the signals according to this transfer characteristic. The test signal generated by a signal generator is input into a synchronization symbol, with the amplitude of the test signal being increased incrementally or being large enough to determine the transfer properties of the amplifier. The test signal has an envelope which is not dependent on time.