Local multipoint communications systems (LMCS) field tests in Canada
Bibliographic record
Abstract
The Communications Research Centre (CRC) conducted field tests on a pilot local multipoint communications system (LMCS) at 28 GHz, in a major urban centre in September of 1997. The coverage of two of four operational cells was studied. This system was configured to broadcast digital video and audio programs originating from a satellite signal. Measurements were taken at 395 sites within a 5-km radius to evaluate the system's availability. The availability is highly dependent on terrain, path clearance, and transmitter/receiver antenna height. Another noteworthy point is that, for both cells, there were sites available outside the anticipated 5-km radius. Measurements were done within clusters consisting of three-by-three test sites, spaced at a distance equal to one residential house, to simulate a real LMCS implementation case. The purpose of this test was to confirm that no large variations of the signal power after down conversion (SPAD) within a small area existed where there were no major blockage. From the results it can be noted that the SPAD variations are only a few dB within a cluster and that all the measured SPAD match closely with the calculated SPAD curves assuming free space propagation.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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 source (direct Gemma or distilled Codex), 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".