Experimental evaluation of a linear angular momentum multiplexed radio link for moving platforms

Ben Allen, Tim W.C. Brown, Tim Drysdale

Research output: Contribution to journalArticlepeer-review


Linear angular momentum multiplexing (LAMM) has recently been proposed for high spectral-efficiency communications between moving platforms, such as between trains and ground infrastructure. We present performance results obtained from a scale experimental system comprising a 2 × 2 antenna system operating at 2.35 GHz. The link transmitted two independent video streams, using RF pre-coding and software-defined radios to modulate and up/down-convert the signals. Linear motion is introduced to demonstrate the translation-invariance of the technique. We interpret the measured data with the aid of an analytical model to show that crosstalk between the two channels is at levels low enough to consistently support the video streams without interruption. Specifically, our results show spectral efficiency is consistently higher when LAMM coding is enabled compared with an uncoded channel.
Original languageEnglish
Article number20210295
JournalProceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
Issue number2254
Early online date20 Oct 2021
Publication statusPublished - 27 Oct 2021


  • wireless communications
  • linear angular momentum multiplexing
  • antenna arrays
  • Spectral efficiency
  • railway communications


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