The HPA used in simulation is meddled by the solid state power amplifier
with input back off of 3 dB and smoothness factor of 2. We assume
that the SI is detected correctly by the receiver. In Fig. 4, we can see that
the BER without HPA is the same for all schemes because we assumed
that the SI is detected correctly by the receiver. With HPA, the BER
degraded for all schemes because of the non-linear characteristic of
the HPA. Furthermore, the BER of LSC-FDMA is better than of SLM
LSC-FDMA but this later is acceptable when we look to the gain of
PAPR reduction provided by SLM scheme.