A Superimposed Codebook Design for Downlink Sparse Code Multiple Access Visible Light Communication System
Abstract
:1. Introduction
- We derive the analytical expression of the average SER for a shot noise-incorporated SCMA-VLC system, based on the probability density function (PDF) of the received signal. The derived analytical expression of the SER is in good agreement with the numerical simulation results.
- We propose a real, superimposed codebook design scheme for a downlink SCMA-VLC system under shot noise. The scheme adopts a separable codebook structure, which contributes to simplifying the optimization objective from minimizing the system SER to minimizing the SER of the one-dimensional components of superimposed codewords. Then, the optimization problem is formulated and solved by the differential evolution (DE) algorithm to obtain the optimal multi-user superimposed codewords for different shot noise conditions. Compared with existing works, the proposed codebooks are able to provide significant gains in BER performance, especially for higher shot noise intensities. In addition, the proposed codebook design scheme can be extended to meet the needs of higher overload factors.
2. System Model
3. SCMA-VLC Codebook Design
3.1. Codebook Structure Design
3.2. Optimization Criteria
3.3. Implementation and Analysis
4. Simulation Results and Discussion
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Parameter | Value |
---|---|
Current-to-light conversion efficiency, | 0.2 A/W |
Semi-angle at half power, | |
Gain of optical filter, | 1 |
Refractive index, | 1.5 |
Field of view of PD, | |
Responsivity of PD, R | 0.6 W/A |
Active area of PD, A | 1 cm2 |
Distance between LED and receivers, | 1 m |
Number of iterations in MPA | 5 |
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Dong, J.; Wang, Z.; Yu, J.; Jiang, Y. A Superimposed Codebook Design for Downlink Sparse Code Multiple Access Visible Light Communication System. Photonics 2024, 11, 321. https://doi.org/10.3390/photonics11040321
Dong J, Wang Z, Yu J, Jiang Y. A Superimposed Codebook Design for Downlink Sparse Code Multiple Access Visible Light Communication System. Photonics. 2024; 11(4):321. https://doi.org/10.3390/photonics11040321
Chicago/Turabian StyleDong, Jingxuan, Zixiong Wang, Jinlong Yu, and Yang Jiang. 2024. "A Superimposed Codebook Design for Downlink Sparse Code Multiple Access Visible Light Communication System" Photonics 11, no. 4: 321. https://doi.org/10.3390/photonics11040321
APA StyleDong, J., Wang, Z., Yu, J., & Jiang, Y. (2024). A Superimposed Codebook Design for Downlink Sparse Code Multiple Access Visible Light Communication System. Photonics, 11(4), 321. https://doi.org/10.3390/photonics11040321