Abstract:  In order to reduce the harm to the system caused by high PAPＲ(Peak Average Power Ｒatio) of OFDM
(Orthogonal Frequency Division Multiplexing) signals，a new algorithm ( LS-ACE-POCS) is obtained by
integrating the LS(Least Square) estimation method into the traditional ACE-POCS algorithm． The least square
estimation is used to calculate an optimal factor in new algorithm，then the optimal factor is multiplied by the
de-peak signal，and generates a new de-peak signal，the new algorithm for one iteration can be compared with
the traditional ACE-POCS algorithm for 10 iterations． The Matlab simulation results show that under the same
simulation environment，the LS-ACE-POCS algorithm's ability to reduce PAPＲ is far superior to the traditional
ACE-POCS algorithm，Specifically，the PAPＲ of the new algorithm after one iteration is 0． 223 dB lower than
that of the traditional algorithm in the tenth iteration，in terms of BEＲ(Bit Error Ｒate) performance，a new
algorithm of bit error rate performance slightly superior to the traditional algorithm，In terms of time complexity，
the new algorithm is much better than the traditional algorithm and greatly reduces the complexity of the system．

Key words: orthogonal frequency division multiplexing, peak average power ratio (PAPＲ), least square (LS)
estimation, ACE-POCS