Bidirectional Decoding of Convolutional Codes Over Rayleigh Fading Channels
Bibliographic record
Abstract
A suboptimal breadth-first multiple-path bidirectional decoding algorithm for convolutional codes has been shown to provide very attractive error performances over the binary symmetric channel. In this paper, new computer simulation results for bidirectional decoding of convolutional codes over soft-decision Rayleigh fading channels are presented. Using a memory length v = 19 and rate R = 1/2 code, these results show that a gain near 5 dB can be achieved for a low frame error probability (P/sub f/ < 10/sup -3/) over the Viterbi algorithm of equivalent decoding complexity (v = 6, R = 1/2). The results also indicate that, depending on the length of the frames, a significant gain can also be achieved for low bit error probability (P/sub b/ < 10/sup -5/).
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How this classification was reachedexpand
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 | 0.001 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".