Introduction - If you have any usage issues, please Google them yourself
OFDM modulation produces higher Peak Average Power Ratio (PAPR) whenever the carriers in OFDM symbol add synchronously in the time domain resulting in higher signal power. This high power saturates the power amplifier placed in the RF section resulting higher bit error rate. To avoid this higher PAPR value the baseband IQ signal has to be pre-processed in the baseband before it is sent to RF