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Multi-Carrier Code-Division Multiple Access (MCCDMA) is a foreseen technique for future high data rate and high capacity multiuser wireless communications. However, the often large values of the Peak-to-Average Power Ratio (PAPR) of the transmitted signals pose a problem in multicarrier systems, because they can lead to nonlinear distortion at the High Power Amplifier (HPA) and a subsequent degradation of the system performance. In this paper, the authors propose a PAPR reduction scheme for MC-CDMA downlink systems based on the addition of peak reduction signals that "Borrow" the spreading codes of idle users. The minimization of the PAPR can then be formulated as a Second-Order Cone Programming (SOCP) problem.
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