---
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标题: "Laser-Diode LiFi With Diffused-Beam Optics: System-Level Modeling and a Cross-Validated ns-3 Simulation Framework"
原文链接: "https://arxiv.org/abs/2608.10950"
发布日期: "2026-08-11"
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---

## Electrical Engineering and Systems Science > Signal Processing

## Title:Laser-Diode LiFi With Diffused-Beam Optics: System-Level Modeling and a Cross-Validated ns-3 Simulation Framework

[View PDF](https://arxiv.org/pdf/2608.10950) [HTML (experimental)](https://arxiv.org/html/2608.10950v1)

> Abstract:Laser diodes (LDs) promise an order-of-magnitude bandwidth advantage over light-emitting diodes for indoor optical wireless access, but reported prototype studies frequently leave the gap between hardware demonstrations and system-level performance unquantified. This paper develops a complete, reproducible system model of a diffused-beam LD LiFi transceiver - a 500-mW laser source beam-shaped by a holographic diffuser, an intensity-modulation/ direct-detection (IM/DD) receiver, and adaptive M-QAM signaling - and embeds it in two cross validated simulators: an open ns-3 module providing full-stack network simulation (channel, PHY, ARQ MAC, Net Device, IP/UDP/TCP) and a Python link-level engine used for Monte Carlo validation of all analytical error models. Starting from a hardware prototype that transferred data, real-time voice, and images over a 14-m line-of-sight link, we identify and close the technical gaps typical of prototype-class reports: serial-interface throughput ceilings misread as optical-link capacity, absent noise modeling, unmeasurable error floors, and unexamined beamwidth/coverage trade-offs. The framework shows that the same optical front end, freed of its 2-Mbaud UART bottleneck and driven at its 250-MHz electrical bandwidth, supports 930 Mb/s net at 14 m under a $3.8 \times 10^{-3}$ HD-FEC threshold with 16-QAM, scales to 1.86 Gb/s at 5 m with 256-QAM, and sustains on-off keying to 23.3 m; a $20^\circ$ diffuser covers a 4.2-m-radius cell of a standard room at desk height. Network simulations over the ns-3 stack yield saturation goodput within 7% of the PHY line rate and sub-0.11-ms 99th-percentile latency at 70% load. All models, code, and figures are released for reproduction.

| Comments: |  |
| --- | --- |
| Subjects: | Signal Processing (eess.SP); Networking and Internet Architecture (cs.NI) |
| Cite as: | [arXiv:2608.10950](https://arxiv.org/abs/2608.10950) \[eess.SP\] |
|  | (or [arXiv:2608.10950v1](https://arxiv.org/abs/2608.10950v1) \[eess.SP\] for this version) |
|  | [https://doi.org/10.48550/arXiv.2608.10950](https://doi.org/10.48550/arXiv.2608.10950) |
| Journal reference: | IEEE Journal of Indoor and Seamless Positioning and Navigation 2026 |

## Submission history

From: Hussain Ahmad Mr. \[[view email](https://arxiv.org/show-email/551d53bf/2608.10950)\]  
**\[v1\]** Tue, 11 Aug 2026 14:19:06 UTC (399 KB)

[Which authors of this paper are endorsers?](https://arxiv.org/auth/show-endorsers/2608.10950) | Disable MathJax ([What is MathJax?](https://info.arxiv.org/help/mathjax.html))
