Generalized Cyclic Delay Diversity for Orthogonal Frequency Division Multiplexing
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Bibliographic record
Abstract
In this paper, we propose a generalized version of cyclic delay diversity (CDD) which is a popular form of space-frequency coding for multi-antenna orthogonal frequency division multiplexing (OFDM) systems. In this generalized CDD (GCDD) the cyclic delays of CDD are replaced with cyclic diversity filters. Assuming bit-interleaved coded modulation (BICM) for forward error correction, we derive an optimization criterion for the GCDD filters and a gradient algorithm for finding the optimum filters. For certain special cases we also provide a closed-form solution for the optimum filters. Simulation results confirm that GCDD can achieve significant performance gains for conventional CDD, especially in spatially correlated fading.
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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