Multicarrier code division multiple access (MC-CDMA) is a very promising technique for high-bit-rate and high capacity transmission in mobile communications. MC-CDMA has the advantage of avoiding the influence of delayed waves and eliminating the intersymbol interference (ISI) by using a guard interval in multipath environments. One disadvantage of multicarrier modulation is the high Peak-to-Average Power Ratio (PAPR) that results in nonlinear distortion at a high power amplifier (HPA) and the degradation of the bit error rate （BER). Various methods for reducing PAPR have been proposed for Orthogonal Frequency Division Multiplexing (OFDM). It is known that the Partial Transmit Sequence (PTS) and the Selected Mapping (SLM) are effective for OFDM. The PTS has been applied to MC-CDMA and shown that it is effective for reducing the PAPR in MC-CDMA as well. However; the effects of SLM for MC-CDMA has not been clarified. In this report, we investigate the effects of SLM for MC-CDMA. We also investigate phase sequences in the SLM that is suitable for reducing the PAPR in MC-CDMA. We show that the SLM is more effective than the PTS at the same amount of side information.
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