Figure 8

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.