Abstract
Using space as an additional degree of freedom is one possible solution to cope with future bandwidth issues. In free-space optics (FSO), spatial multiplexing of structured light modes is limited by the impact of the atmospheric turbulence. Therefore, beating the effects of turbulence is a major problem for structured light-based FSO communication. Here, we model the propagation of Laguerre-Gaussian beams using a modified von Karman turbulence model with time-dependent turbulence phase screens. We equally investigate the performance of a zero-forcing pre-coding technique to mitigate the effects of turbulence in a full-duplex Laguerre-Gaussian mode based FSO. In the modeling, we account for various limiting factors, including phase estimation errors, noise, imperfect, and outdated channel-state information on the pre-coding approach.
Highlights
F REE space optics (FSO) is an unlicensed communication technology that uses the free space as a propagation medium to connect two communicating terminals wirelessly [1]
The concept is known as spatial mode multiplexing (SMM) [6]
We investigate the impact of various system imperfections, including phase estimation error and imperfect channel state information (CSI)
Summary
F REE space optics (FSO) is an unlicensed communication technology that uses the free space as a propagation medium to connect two communicating terminals wirelessly [1]. Adopting FSO can help to tackle the ‘digital divide’ between rural and urban areas [2]. All of these advantages have made FSO a technology candidate for the future generation 6G era [3]–[5]. In SMM, each spatial mode can be used as an independent data carrier scaling the transmission capacity by the number of modes used. We provide numerical simulations of the performance of the crosstalk suppression technique for a communication system involving modes from the general LG mode set, giving further insight into this subject.
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