Abstract: Orthogonal frequency division multiplexing-continuous phase modulation(OFDM-CPM) system introduces memories using the concept of correlated phase state.Thus its BER perfor-mance is better than the conventional OFDM system.One of the key techniques is to reduce the peak-to-average power ratio(PAPR) of the OFDM-CPM system.Using the concept of constant envelope(CE),a novel modulation scheme CE-OFDM-CPM is proposed in this paper.The PAPR of OFDM-CPM can be reduced to 0 dB.