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. 2016 Sep 23;6:33482. doi: 10.1038/srep33482

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Copyright © 2016, The Author(s)

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Measured BER and SNR as functions of the reflector distance h for (a) ℓ = +1 and (b) ℓ = +3. Stronger fluctuations of BER and SNR are observed for OAM with ℓ = +3 because of the stronger intra-channel crosstalk induced by multipath effects. The distance between Tx and Rx aperture is 2.5 m.