Performance analysis of multicarrier CDMA systems with parallel and serial concatenated coding in fading channels
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Bibliographic record
Abstract
The authors present a bit error rate performance analysis of multicarrier code division multiple access (MC-CDMA) systems with turbo and serial concatenated convolutional coding (SCCC) in multipath fading channels. The performance analysis is done for maximal ratio combining and minimum mean square error combining detection in the downlink system. Upper bounds to the average bit error probability are presented for a punctured turbo code and for an SCCC code of similar decoding complexity. These analytical bounds are derived for fully interleaved Rayleigh fading channels. The bit error rate performance is also verified by simulations in the regions of low signal-to-noise ratios. The analytical and simulation results illustrate the relative merits of the turbo and SCCC codes for MC-CDMA systems and their suitability to achieve very low error rates in wireless data applications.
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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 | 0.001 | 0.001 |
| 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