A pilot symbol assisted interference cancellation scheme for an asynchronous DS/CDMA system
Bibliographic record
Abstract
We consider a single cell asynchronous BPSK DS/CDMA system with successive interference cancellation. The system operates in a Rayleigh flat fading channel and pilot symbols are inserted periodically to the transmitted data for the purpose of channel estimation. We introduced previously a pilot symbol assisted interference canceller that was made up of two parts-a decorrelating receiver for the faded pilot symbols, followed by a successive interference canceller (SIC) for the data symbols. The receiver could operate in small cells with a maximum round trip delay of a quarter of a symbol time and was able to provide a performance improvement over a pure SIC receiver for both the pilot and the data symbols. We introduce two fragile structures that allow the usage of the hybrid receiver in larger cells with a round trip delay of one symbol time. Furthermore, the complexity of the decorrelator is kept at a moderate level. The performance of the hybrid receiver operating on both frame structures is compared and a comparison is made with a pure SIC cancelling receiver. It was found that one of the investigated frame structures in conjunction with the hybrid receiver increased the system capacity as compared to a pure SIC receiver and offers moreover a comparable system complexity.
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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 | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 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 | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 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".