Reduction effect of SLM on the PAPR in MC-CDMA system

The model of the MC-CDMA system using selective mapping (SLM) is analyzed and the upper bound of the peak-average power ratio (PAPR) in the system is derived. For the PAPR distribution and the connection between the PAPR and the number of users in the MC-CDMA system using SLM, the simulations are given based on several phase sequences in SLM. The simulation results show that when random sequences, Shapiro-Rudin sequences or Golay complementary sequences are selected as the phase sequences in SLM, SLM has obvious effect on the PAPR reduction in MC-CDMA system and the system PAPR nearly maintains constant as the number of users varies. The maximal PAPR in the MC-CDMA system using SLM(10 users) is about 6.3 which is 3.3 less than that in the common MC-CDMA system (without SLM).