On the reserved sub-carrier approach to achieving N-continuity for side-lobe reduction in OFDM
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Bibliographic record
Abstract
Orthogonal frequency division multiplexing (OFDM) is a popular modulation scheme used in a variety of applications. One significant problem associated with OFDM is the possibility of large side-lobes in its spectrum. In this paper, we consider the so-called N-continuous method for reducing the side-lobes. We first consider one implementation approach, whereby certain sub-carriers are reserved for the purpose of adjusting the spectrum of an OFDM symbol. We find that significant side-lobe reduction is possible, although at the cost of injecting very large power in the reserved sub-carriers that results in unacceptable spectrum overshoot. In order to achieve reasonable power levels, at least 20% of all sub-carriers must be reserved for weighting. As a solution to the problem of spectrum overshoot, we propose an alternative approach whereby the power of the reserved sub-carriers is constrained. Numerical results show that reasonable power levels are achieved at the cost of significant performance loss in the N-continuous OFDM technique for side-lobe reduction. We thus find that the performance cost of eliminating the spectrum overshoot reduces the side-lobes reduction to less than 5 dB in cases of interest.
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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