A Microwave Photonic Signal Processor for Arbitrary Microwave Waveform Generation and Pulse Compression
Bibliographic record
Abstract
A microwave photonic signal processor for arbitrary microwave waveform generation and pulse compression based on a microwave photonic filter (MPF) and a time reversal module (TRM) is proposed and experimentally demonstrated. In the proposed signal processor, an arbitrary microwave waveform is generated by allowing an ultrashort microwave pulse to pass through an MPF and a TRM, to get a microwave waveform to have a spectrum that is the complex conjugate of the spectral response of the MPF. When the generated microwave waveform is transmitted and received, by passing the received microwave waveform through the same MPF, matched filtering is performed and the microwave waveform is compressed. The proposed microwave photonic signal processor is verified by two experiments, in which a linearly chirped microwave waveform (LCMW) with a bandwidth of 7.7 GHz and a 7-bit phase-coded microwave waveform (PCMW) with a carrier frequency of 4.08 GHz are generated and compressed. The temporal durations of the generated LCMW and PCMW are 5.57 and 5.4 ns, respectively, and the widths of the compressed pulses are 0.27 and 0.58 ns, corresponding to pulse compression ratios of 20.6 and 9.3, respectively.
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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 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
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".