Abstract
Orbital angular momentum (OAM) multiplexing is considered to have the potential of further improving the spectral efficiency of communication systems. However, a common uniform circular array (UCA)-based multi-mode OAM communication system using discrete Fourier transform (DFT) and inverse DFT (IDFT) has high peak-to-average power ratio (PAPR), which reduces the radio frequency power amplifier (PA) efficiency and degrades system performance. In this paper, a constant envelope OAM (CE-OAM) system is proposed to achieve the minimum signal PAPR to maximize the PA efficiency. The transmitter using a phase modulator converts the high PAPR signal into constant envelope signal with $0$dB PAPR, and the receiver performs inverse transform after OAM symbol detection, followed by the conventional OAM demodulation. Simulation results validate the feasibility of the proposed CE-OAM system and shows that CE-OAM system with appropriate modulation coefficient outperforms conventional OAM system in both PAPR and bit error rate (BER) performances.
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