Optimal Symbol Set Design for Generalized Spatial Modulations in MIMO VLC Systems

Curry, Elam; Borah, Deva K.; Hinojo, José María

doi:10.1109/glocom.2016.7842097

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…Equivalently, we can show that γ (l) t /γ (s) t < 1. For DU s and IU l, we express the SNR and SINR using (2) and (5)…”

Section: B Cumulative Regretmentioning

confidence: 99%

“…is the distance between the transmitter of link l and mirror m, d (2) m,l is the distance between the receiver of link l and mirror m, and κ is the reflective coefficient of the IRS array. The time index t is omitted from the RHS variables d , we can represent the assignment of mirrors without the need to optimize mirror angles, which would otherwise form a nonlinear optimization problem [16].…”

Section: B Cumulative Regretmentioning

confidence: 99%

“…As the radio frequency (RF) spectrum has become increasingly crowded, there has been research focus on other underutilized frequency bands and their incorporation into existing technologies. This includes the visible light communication (VLC) systems [2] - [7]. VLC provides many advantages, such as large and unlicensed bandwidths, no interference with existing RF technology, and potential applications in scenarios where RF is prohibited for health reasons [8].…”

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confidence: 99%

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A Multi-Armed Bandit Algorithm for IRS-Aided VLC System Design With Device-to-Device Relays

Curry,

Borah

2024

IEEE Access

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This paper presents a communications framework to overcome the connectivity constraints due to the nonavailability of the line-of-sight transmissions in indoor optical communication systems. This nonavailability can arise for various reasons, such as blockages due to physical objects, unfavorable device orientations or large distances between the transmitter and the receiving devices. The proposed system utilizes multiple intelligent reflecting surface (IRS) arrays and device-to-device (D2D) communications. The D2D communication is realized using infrared (IR) light-emitting diodes (LEDs) with limited output power for eye safety. The performance of this system depends significantly on the assignment of the mirrors in the IRS arrays to the appropriate user links and a direct combinatorial assignment search is too complex to implement. The proposed approach identifies the assignment of each mirror in the IRS arrays as a multi-armed bandit (MAB) problem, and the assignment of all the mirrors together as a combinatorial MAB (CMAB) problem. Since a simultaneous movement of all the IRS mirrors during the implementation of the CMAB algorithm could cause frequent link disruptions, a CMAB algorithm with low disruptions (CMAB-LD) is proposed to obtain the best mirror assignment with low link disruptions. Simulation results demonstrate that the proposed algorithm can provide significant improvement in reward performance and the total reward increases by more than 100% over random mirror assignments when the channels are blocked with high probabilities. In small size problems, the proposed CMAB-LD is found to achieve the global optimal solution in just a few rounds of full arm explore operations.INDEX TERMS Visible light communication, intelligent reflecting surface, device-to-device communication, multi-armed bandit.

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“…Equivalently, we can show that γ (l) t /γ (s) t < 1. For DU s and IU l, we express the SNR and SINR using (2) and (5)…”

Section: B Cumulative Regretmentioning

confidence: 99%

Section: B Cumulative Regretmentioning

confidence: 99%

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confidence: 99%

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