代码中描述了用星座图扩展法（Active Constellation Extension，ACE）降低OFDM时域信号的PAPR，ACE的具体算法是凸集映射（Projection Onto Convex Sets，POCS）-These codes describe PAPR reduction using Active Constellation Extension (ACE). The detailed algorithm is Projection Onto Convex Sets (POCS）