Advanced demodulation techniques for digital audio broadcast signals over fast fading channels.
Bibliographic record
Abstract
The Canadian digital audio broadcast (DAB) system uses a multicarrier modulation technique known as coded orthogonal frequency division multiplexing (COFDM). Several modes of operation are available. Mode IV, which has the longest symbol duration, allows transmitting antennas to be spaced more widely than other modes of operation providing a saving in broadcast infrastructure. However, the longer symbol duration also causes partial loss of coherence in subsequent symbol epochs that can cause a noticeable degradation in audio quality at velocities exceeding 92 km/hr in a typical urban propagation environment. This thesis identifies several advanced demodulation techniques that can be used in a receiver that will operate at higher vehicle velocities. One of these techniques, an iterative decision directed linear predictive receiver, has not been previously discussed in the literature. Simulation results indicate that the maximum vehicle velocity can be increased to 144 km/hr using this new receiver design.
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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 | 0.000 | 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 | 0.002 |
| 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".