What is CEOFDM (Constant envelope OFDM)?

Constant envelope OFDM (CE-OFDM) changes the OFDM signal, to a signal intended for efficient power enhancement, via phase modulation. At the receiver, the inverse transformation - phase demodulation - is related prior to the conventional OFDM demodulator. The execution of CE-OFDM is dissected in additive white Gaussian noise (AWGN) and fading channels.