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$Interference and Diffraction$ 02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Interference cancellation in MIMO NLOS optical-camera-communication-based intelligent transport systems.

Navid Bani Hassan, Zabih Ghassemlooy, Stanislav Zvanovec

|December 25, 2019

Summary

New algorithms enhance vehicle communication reliability using visible light. The frame subtraction and channel inversion (FSCI) scheme offers comparable performance to existing methods with simpler receivers.

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Area of Science:

Optical Wireless Communications
Wireless Communication Systems

Background:

Increasing vehicle numbers necessitate advanced communication systems.
Visible Light Communications (VLC) offers a complementary solution to crowded radio-frequency networks.

Purpose of the Study:

To propose novel algorithms for reliable data extraction in non-line-of-sight (NLOS) multiple-input-multiple-output (MIMO) VLC systems.
To enhance data extraction reliability in optical camera communications (OCC).

Main Methods:

Development of two novel algorithms: Channel Inversion (CI) and Frame Subtraction and CI (FSCI).
Utilizing differential modulation, frame subtraction, and a unique packet structure for transmitter (Tx) identification.
Implementation in a NLOS MIMO spatial-division multiplexing OCC system.

Main Results:

The FSCI scheme achieves comparable Bit Error Rate (BER) performance to Hybrid Selection/Equal Gain Combining (HS/EGC) with simpler receiver structures.
FSCI demonstrates improved performance at higher illumination levels (>20dBm) for multiple Txs compared to HS/EGC.
CI schemes exhibit greater tolerance to Tx spacing than HS/EGC, allowing a fixed payload threshold.

Conclusions:

The proposed FSCI algorithm provides a reliable and efficient method for data extraction in VLC systems.
FSCI offers a practical alternative to HS/EGC, especially in scenarios with varying illumination levels and multiple transmitters.
The CI-based approaches enhance the robustness of VLC systems against transmitter spacing variations.