Receiver structures and performance for unresolved Ricean/Rayleigh multipath fading channels
Bibliographic record
Abstract
This paper considers receiver structures and performance for unresolved mixed mode Ricean/Rayleigh multipath channels. A fading channel is said to be mixed mode if the first path gain is Ricean distributed and the other path gains are Rayleigh. The optimal receiver for this case consists of a decorrelation stage combined with a quadratic form, as well as a nonlinear term related to the Ricean specular component. Replacing the nonlinear term by a quadratic form, yields a novel family of quadratic sub-optimal receivers, quadratic decorrelation receivers (QDR), that could be more easily implemented. These receivers exploit the decorrelation performed on the signal samples similar to the optimal receiver. Single pulse performance of the QDR and other sub-optimal structures is studied for binary FSK and DPSK. It is shown that SNR gains can be obtained by the use of receivers that exploit the knowledge of the specular component. Furthermore, we demonstrate the importance of the decorrelation operation in eliminating the error floors when the multipath is unresolved.
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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 | 0.002 | 0.003 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| 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".