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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Published on: March 20, 2017

Indoor multiuser visible light communication systems using Hadamard-coded modulation.

Jie Lian¹, Mohammad Noshad², Maïté Brandt-Pearce³

¹Northwestern Polytechnical University, School of Marine Science and Technology, Xi'an 710072, People's Republic of China.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences

|March 3, 2020

Summary

This summary is machine-generated.

This study introduces Hadamard-coded modulation (HCM) for visible light communications (VLC) to boost indoor data transmission. Optimal codeword assignment significantly enhances user throughput, achieving up to double the rate compared to random methods.

Keywords:

Hadamard-coded modulation multiuser systems optical wireless communications visible light communications

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Area of Science:

Optical Wireless Communication
Digital Communications

Background:

Visible light communication (VLC) utilizes LED lighting for short-range data transmission.
Existing systems face challenges with peak power limits and nonlinear distortion.
Hadamard-coded modulation (HCM) offers a framework for multiuser VLC systems.

Purpose of the Study:

To investigate the performance of a multiuser VLC system employing DC-reduced Hadamard-coded modulation (DCR-HCM).
To optimize codeword assignment for enhanced average throughput considering varying user hardware capabilities.
To analyze the impact of multiple lamps and signal arrival times on system performance and interference.

Main Methods:

Implementation of DC-reduced HCM (DCR-HCM) to mitigate nonlinear clipping distortion in LEDs.
Development of an optimal codeword assignment strategy based on user hardware capabilities.
Simulation of a multi-lamp indoor VLC scenario to evaluate interference and throughput distribution.

Main Results:

Optimal codeword assignment significantly improves average throughput, potentially doubling it compared to random assignment.
Assigning multiple codewords per user further boosts throughput when user numbers are limited.
Spatial throughput variation in multi-lamp systems shows a maximum-to-minimum data rate ratio as high as 10.

Conclusions:

DCR-HCM is effective for multiuser VLC, balancing performance and LED constraints.
Codeword assignment optimization is crucial for maximizing throughput in VLC networks.
Interference management is key for achieving high data rates in complex indoor VLC environments.