In the two proposed PTS schemes for SFBC MIMO-OFDM
systems, only the samples with the corresponding cost function
greater than or equal to the threshold αTH are used to estimate
the peak power of the candidate signals in each transmitting
antenna. Thus, the choice of αTH determines the computational
complexity of the proposed methods. In [13], the authors
derived the minimum possible peak power γ
N in the OFDM
system with N subcarriers as follows: