Open AccessExperimental evaluation of a linear angular momentum multiplexed radio link for moving platforms
Author(s) -
Ben Allen,
Tim Brown,
Timothy D. Drysdale
Publication year - 2021
Publication title -
proceedings - royal society. mathematical, physical and engineering sciences
Language(s) - English
Resource type - Journals
eISSN - 1471-2946
pISSN - 1364-5021
DOI - 10.1098/rspa.2021.0295
Subject(s) - multiplexing , angular momentum , electronic engineering , computer science , coding (social sciences) , spectral efficiency , physics , channel (broadcasting) , telecommunications , engineering , mathematics , statistics , quantum mechanics
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.