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The DCM scheme is exploited as the modulation scheme for high-data rate transmission in the MB-OFDM system. However, since the DCM modulated symbols are repeatedly fed into the IFFT block, the MB-OFDM system has a high PAPR problem. In this paper, improved DCM is proposed for PAPR reduction in the MB-OFDM systems. The proposed scheme uses a circular shifting operation of the gray coded 16-QAM constellation...
The dual carrier modulation (DCM) has been proposed for use in the multi-band orthogonal frequency division multiplexing (MB-OFDM) ultra-wideband (UWB). The DCM has a significant diversity improvement in multi-path fading channel, but it suffers from a high peak-to-average power ratio (PAPR). Many PAPR reduction schemes have been introduced for solving the PAPR problem. However, general PAPR reduction...
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