16 QAM Radio Link on the 5.7 GHz ISM Band
Bibliographic record
Abstract
A wireless data distribution system could be more cost effective than retrofitting cable to a finished building. The radio channel has the disadvantage of being lossy, noisy, and frequency selective. To compensate, the modulator/demodulator needs to be more robust. This thesis investigates the feasibility of implementing a modern wireless data distribution in an in—building environment. The cost of FPGA's is constantly decreasing, making this solution more and more cost—effective as time goes on.\n\nThe ISM band is used in order to avoid licensing issues. This band requires that spread spectrum modulation with a spreading gain greater than or equal to 10 be used. To get a full complement of music channels on the ISM bandwidth requires a high order modulation scheme. In this study, the feasibility of implementing a 16— QAM modem is investigated. The resulting system is a hybrid modulation scheme with direct sequence spread spectrum modulation in tandem with 16-QAM.\n\nThe entire system, excluding the RF portion, is implemented on three Altera 100,000 gate FLEX 10KA series FPGA's. The design is specified using Verilog HDL. This facilitates future design changes and ASIC development.
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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 | 0.000 | 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) | 0.018 | 0.004 |
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".