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This paper examines the problem of reducing the peak-to-average power ratio (PAPR) occurring in non-contiguous OFDM (NC-OFDM) systems proposed for cognitive radio. The PAPR analysis for NC-OFDM is unlike that of contiguous OFDM and so mitigation schemes must be modified. We propose an algorithm that combines phase adjustment, interleaving and power back-off in a way that is tailored for NC-OFDM. The...
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