Abstract
Linear angular momentum multiplexing is a new method for providing highly spectrally efficient short-range communication between a transmitter and receiver, where one may move at speed transverse to the propagation. Such applications include rail, vehicle and hyperloop transport systems communicating with fixed infrastructure on the ground. This paper describes how the scientific concept of linear angular momentum multiplexing evolves from orbital angular momentum multiplexing. The essential parameters for implementing this concept are a long array at least at one of the ends of the link; antenna element radiation characteristics and the array element spacing relative to the propagation distance. These parameters are also backed by short-range measurements carried out at 2.4 GHz used to model the Rice fading channel and determine resilience to multipath fading.
Highlights
Antenna arrays have historically served two main purposes in wireless communication
This paper describes just such a technique, which evolves from orbital angular momentum (OAM) multiplexing to consider linear angular momentum (LAM) multiplexing
LAM multiplexing further exploits the relative lateral translation of the transmit and receive antennas to create the large effective aperture that is needed to distinguish between modes; analogously to other synthetic aperture techniques, the effective aperture is extended in the direction of travel, allowing a relatively small-receive antenna to sample the spatially distributed phase patterns of each of the independent LAM modes
Summary
Antenna arrays have historically served two main purposes in wireless communication. First, as diversity antennas to mitigate multipath fading in non line-of-sight environments [1] and second as beamforming arrays that reduce the path loss in line-of-sight links [2]. LAM multiplexing further exploits the relative lateral translation of the transmit and receive antennas (perpendicular to the link) to create the large effective aperture that is needed to distinguish between modes; analogously to other synthetic aperture techniques, the effective aperture is extended in the direction of travel, allowing a relatively small-receive antenna to sample the spatially distributed phase patterns of each of the independent LAM modes In this way, for the special case of the vehicular geometries considered, LAM multiplexing achieves similar capacity enhancements to OAM multiplexing, but does so using low-profile antenna elements and overall array dimensions that are consistent with application to the ground to rail, d.
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