OFDMA-based radio communication apparatus and learning signal generation method for compensation of non-linear distortion in the radio communication apparatus

A learning signal generation method that generates a learning signal in an OFDMA-based radio communication apparatus that comprises a radio transmission unit that amplifies a transmission signal by a transmission amplifier;

• and a distortion compensation unit that generates distortion compensation coefficient data that serve to compensate for non-linear distortion of said transmission amplifier based on said learning signal and inputs a transmission signal obtained by multiplying an OFDMA signal by the distortion compensation coefficient data to said radio transmission unit,
• wherein the learning signal generation method comprises:
• an MAC processing step that generates said learning signal and inserts the generated learning signal as a burst signal in a burst region of OFDMA frames to which a burst signal can be allocated so as to generate OFDMA frame data;
• and
• a PHY processing step that converts said OFDMA frame data into said OFDMA signal of a frequency domain based on a transmission mode of an OFDMA system that has been set for said radio communication apparatus and inputs said converted OFDMA signal to said distortion compensation unit,
• wherein said MAC processing step inserts said learning signal in the burst region of the OFDMA frames until the end of the burst region is filled with the learning signal immediately after said radio communication apparatus activates until said distortion compensation coefficient data have been initially and completely generated.