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PAPR reduction in orthogonal MC and MC-SS systems

Several Multi-Carrier (MC) and Multi-Carrier Spread Spectrum (MC-SS) schemes have been proposed for the downlink of the next generation of wireless systems (4G). One of the major drawbacks with MC modulations is the large Peak-to-Average Power Ratio (PAPR) of the transmitted signal which reduces the D/A and A/D effective mean resolution, the power amplifier efficiency and the battery life. In this paper the effects of the PAPR in OFDM and MC-CDMA as well as the consequences of using determined PAPR reduction methods are studied. Appropriate PAPR reduction methods from those that can be found in the literature have been selected in order to guarantee the compatibility with current 4G downlink proposals.