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- W3097975178 abstract "We show that the public experiment held in Venice by F. Tamburini et al and reported in (2012 New J. Phys. 14 033001) can be regarded as a particular implementation of Multiple-Input Multiple-Output (MIMO) communications, hence bringing no advantages with respect to known techniques. Moreover, we explain that the use of a 'vortex' mode (orbital angular momentum OAM l = 1) at one of the transmit antennas is not necessary to encode different channels since only different patterns -or similarly different pointing angles- of the transmit antennas are required. Finally, we identify why this MIMO transmission allowed decoding of two signals despite being line-of-sight. This is due to the large separation between the receiving antennas, which places the transmit antennas in the near-field Fresnel region of the receiving 'array'. This strongly limits the application of this technique in practice, since, for a fixed separation between receiving antennas, the detectable signal power from any additional vortex mode decays at least as 1/r^4." @default.
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- W3097975178 date "2012-11-07" @default.
- W3097975178 modified "2023-10-16" @default.
- W3097975178 title "Comment on ‘Encoding many channels on the same frequency through radio vorticity: first experimental test’" @default.
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- W3097975178 doi "https://doi.org/10.1088/1367-2630/14/11/118001" @default.
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