High-speed trains (HSTs) are very importance in public transportation. However, current radio frequency (RF) wireless access technologies cannot satisfy the demands of stable and high-rate transmissions for HSTs. Free space optical (FSO) communication is an alternative way to promote data rate. In this paper, we apply single-input multi-output (SIMO) and multi-input multi-output (MIMO) technologies to the FSO communication for HSTs to enhance system performance. Besides, we investigate the laser diode rotating strategy for the MIMO FSO communication system to further improve the BER performance. Analytical and simulation results are provided to verify the enhancement of the MIMO FSO communication system
This paper proposes an intelligent reflecting surfaces (IRSs)-assisted Petahertz mobile communication system. The IRSs are utilized in this system to assist the base station for beam tracking and reduce the impact of obstacles by path replanning and real-time power distribution. The scheme of auxiliary beam deflection and tracking is purposed based on the working principle of phase controlled IRSs. Since signals can be deflected freely among multiple IRSs, two multi-path power allocation schemes for optimal system performance are also proposed. Experiments and simulation are presented for verification.
A single transverse electric mode silicon nitride strip waveguide functionalized with cross bowtie nanoplasmonic antenna is investigated, and then its tunable dipole plasmon resonance and maximum local field enhancement are numerically analyzed. The cross bowtie antenna is composed of a horizontal bowtie parallel to the propagation and a vertical bowtie parallel to the electric field. We demonstrate that the dipole plasmon resonance wavelength of localized surface plasmon resonance of cross bowtie antenna can be tuned by the horizontal bowtie, specifically by the edge length of its regular triangular nanoprisms, and the dipole plasmon resonance wavelength is independent of the horizontal gap. We also show that the maximum local field enhancement of cross bowtie antenna can be tuned by the vertical bowtie, specifically by the edge length of its regular triangular nanoprisms. The tunable dipole plasmon resonance and maximum local field enhancement of integrated cross bowtie nanoplasmonic antenna can practically be applied for on-chip sensing applications.
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