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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...
A 4+12+16 amplitude phase shift keying (APSK) modulation outperforms other 32-APSK modulations such as rectangular or cross 32-quadrature amplitude modulations (QAMs) which have a high peak to average power ratio that causes non-negligible amplitude modulation to amplitude modulation (AM/AM) and amplitude modulation to phase modulation (AM/PM) distortions when the signal is amplified by a high-power...
In an orthogonal frequency division multiplexing (OFDM) system, in-phase and quadrature (I/Q) imbalances generated in the analog front-end introduce inter-channel interference (ICI) and, consequently, error performance degradation. In this paper, a general and exact expression involving the two-dimensional (2-D) Gaussian Q-function for symbol error probability of MPSK-OFDM signal with I/Q imbalances...
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