The ACE method also is attractive for reducing the peak
power of OFDM signals by extending some modulation constellation
points toward the outside of the constellation without
loss of data rate. In contrast to the PTS technique, the ACE
method usually has a better PAPR reduction performance
and does not need to send side information to the receiver.
However, the ACE method uses a complex repeated-clippingand-filtering
process and has a power penalty. Furthermore,
when the ACE method is applied to the input signal of an
individual transmitting antenna in MIMO-OFDM systems with