Iterative Semi-Coherent Receiver for Coded LoRa Systems
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Bibliographic record
Abstract
This letter presents a novel design of an iterative receiver for low-power long-range (LoRa) systems with channel coding and semi-coherent receiver. To enable soft-input-soft-output (SISO) decoding, closed-form expressions for the exact distribution of the received signal samples and the resulting log-likelihood ratios of the coded bits are obtained. Next, we propose an iterative semi-coherent receiver that performs iterative processing among the soft-output demodulator, the SISO channel decoder, and the blind channel estimator, i.e., without any training overhead. Simulation results show that our proposed receiver outperforms non-coherent receiver, and closely approaches the ideal coherent receiver’s performance.
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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 | 0.001 | 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