A generalized signal model for multiple orbital angular momentum (OAM) mode-based radio communication combined with a novel partial arc sampling receiving (PASR) scheme for compactly receiving is proposed and mathematically analyzed. Furthermore, a near-field line-of-sight PASR radio data link using four OAM modes is experimentally demonstrated to quadruple the spectral efficiency without adding signal processing complexity at the receiving end. Experiment results show that all the four OAM channels are recovered with bit-error rates below 3.8 × 10-3, indicating the robustness of the four-OAM-mode-PASR data link.
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Zhang et al. (2016) studied this question.
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