Orbital Angular Momentum Spread Transmission With Interferometry Codes for Peak-to-Average Power Ratio Reduction

The uniform circular array (UCA) has been considered to be an effective way to generate orbital angular momentum (OAM) waves. However, by using UCA to transmit multiplexing OAM signals, the peak-to-average power ratio (PAPR) is unavoidable, which brings the low efficiency to the power amplification. In this letter, the interferometry code is introduced to reduce the PAPR in the antenna element of OAM multiplexing transmission at the transmitter. Specifically, the system architecture of OAM by UCA is proposed with the interferometry code spread for PAPR reduction. The simulations and experiments confirm the validity and efficiency of the proposed scheme.