Experimental Evaluation of an OFDM Millimeter Wave System in an Underground Mine Channel Based on the IEEE802.15.3c Standard
Bibliographic record
Abstract
In this paper, the time dispersion propagation measurements and the performance study of an OFDM system in a millimeter wave underground mine wideband wireless channel are addressed. Time dispersion and coherence bandwidth results are analyzed at both 40 m and 70 m levels of the mine. Different antenna configurations such as horn-horn and horn- omni in a line of sight (LOS) situation have been considered during the measurements. In contrast to conventional indoor millimetre wave channels, the channel in the underground mine is highly reflective, resulting in a rich scattering environment with significant RMS delay spread. Based on the obtained measurement results, the bit error rate (BER) performance is evaluated for a wideband orthogonal frequency division multiplexing (OFDM) system. Results show that the rough surface scattering, the directivity of the antenna and the gallery dimensions of the underground mine affect the performance of the system.
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How this classification was reachedexpand
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 | 0.001 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".