Class of Full-Rank Space-Time Codes Combining Orthogonal Designs With Delay Diversity
Bibliographic record
Abstract
This paper considers a new class of full-diversity space-time (ST) codes for multiple-transmit-antenna wireless systems. These codes, relying on partitioning the transmit antennas into groups, consist of a combination of delay transmit diversity with orthogonal ST block codes and specially designed symbol mappings of information bits into channel symbols. Due to the orthogonality of the ST block codes, which guarantees each antenna group composed signal to have full rank, and the blockwise delay diversity, which guarantees independence of the signals transmitted by different antenna groups at the same time, these codes achieve full diversity with relatively low decoding complexity. A computer search has been employed to determine the channel symbol mappings for codes with quaternary phase-shift keying (QPSK) and eight-phase PSK modulation that maximize the asymptotic coding advantages. For 16-phase quadrature amplitude modulation (16 QAM), we present a novel hand-designed code. These codes yield performance gains in terms of both frame error rate and bit error rate with respect to many known full-diversity codes over quasi-static and block-fading Rayleigh channels, with decoding of reasonable complexity.
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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 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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".