Peak-to-average power ratio analysis in multicarrier DS-CDMA

Multicarrier direct-sequence code-division multiple access (MC-DS-CDMA) is an attractive technique for achieving high-bitrate wireless data transmission. Although the potentially large peak-to-average power ratio (PAPR) is an important factor for its application, there is no theoretical PAPR analysis of the transmitted signal in an MC-DS-CDMA system in the literature. The purpose of this paper is to fill such a gap. We derive a general formula for the complementary cumulative distribution function (CCDF) of the PAPR of an MC-DS-CDMA signal, giving a possible lower bound of CCDF. To achieve the lowest bound of CCDF, a criterion is proposed for optimal interleaver design in an MC-DS-CDMA system. By using two interleaver design methods as examples, simulation results demonstrate the effectiveness of the new criterion in interleaver design.