Joint carrier frequency offset, sampling time offset and channel estimation in multiuser OFDM/OQAM systems
Why this work is in the frame
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Bibliographic record
Abstract
A derivative of orthogonal frequency division multiplexing (OFDM) based on offset quadrature amplitude modulation, OFDM/OQAM, is among the waveform contenders for future wireless networks. Focusing on multiuser scenarios, i.e. uplink of a multiple access system, we propose an improved joint estimation method for carrier frequency offset, sampling time offset and channel impulse response needed for the practical application of OFDM/OQAM. The proposed method offers a pilot-based maximum-likelihood (ML) estimation of the unknown parameters in multiuser OFDM/OQAM systems. Formulation of the estimator is based on the splitting of each received pilot symbol into contributions from surrounding pilot symbols, non-pilot symbols, additive noise and multiuser interference. The proposed estimator is compared with a highly cited previous work of the same focus where the improvements in the results indicate the superiority of the former.
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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