Practical OFDM signalling for visible light communications using spatial summation
Why this work is in the frame
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Bibliographic record
Abstract
Visible light communication (VLC) channels leverage solid-state illumination devices to provide a dual role as high-speed communication links. These channels are bandwidth-limited and can have high SNRs. Bandwidth-efficient intensity-modulated/direct-detection (IM/DD) orthogonal frequency-division multiplexing (OFDM) has been considered for VLC systems. Key drawbacks of OFDM in IM/DD channels are its high peak-to-average power ratio (PAPR) as well as the difficulty of implementing power efficient, high current, wideband drivers. In this paper, we propose a new form of IM/DD OFDM termed spatial optical OFDM (SO-OFDM) in which multiple narrowband OFDM signals are transmitted simultaneously from different LEDs and allowed to sum in space. In this way, a conventional OFDM receiver can be employed while having a series of lower power transmitters, each with improved PAPR. Simulation results show that in comparison with conventional IM/DD OFDM, SO-OFDM is more robust to amplifier nonlinearities and can be implemented with more efficient line driver topologies.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it