Performance Analysis of Transmit Diversity in Multiuser DS-CDMA Systems Over Quasi-Static Fading Channels
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Bibliographic record
Abstract
The performance of space-time spreading transmit diversity designed for fast-fading channels is examined in a multiuser direct-sequence code division multiple access (DS-CDMA) system over quasi-static fading channels. The space-time system employs two transmit antennas and single receive antennas at the user side and base-station receiver, respectively. The receiver employs a decorrelator multiuser detector. In the analysis, we obtain a closed form expression for the bit error probability. It is shown that the performance of the space-time transmit diversity scheme, designed earlier for fast-fading channels, reduces to that of the existing schemes designed for slow-fading channels. Both simulations and analytical results demonstrate that, regardless of the system load, the full system diversity is maintained when a decorrelator detector is used at the receiver side.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.002 | 0.005 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.003 | 0.001 |
| 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