  Orthogonal frequency division multiplexing (OFDM) signals have high
peak-to-average power ratio (PAPR), which causes distortion when OFDM signal
passes through a nonlinear high power amplifier (HPA). A partial transmit
sequence (PTS) scheme is one of the typical PAPR reduction methods. A cyclic
shifted sequences (CSS) scheme is evolved from the PTS scheme to improve the
PAPR reduction performance, where OFDM signal subsequences are cyclically
shifted and combined to generate alternative OFDM signal sequences. The shift
value (SV) sets in the CSS scheme should be carefully selected because those
are closely related to the PAPR reduction performance of the CSS scheme. In
this letter, we propose some criteria to select the good SV sets and verify its
validness through simulations.
