Multiuser detection for Rate-½ OSTBC wih four transmit antennas
Bibliographic record
Abstract
In this paper we consider a multiuser detection scheme where K users, each with NTtransmit antennas, transmit their symbols simultaneaously using space-time block coding (STBC). Previously, it was shown that a receiver can completely separate signals of K users, where each user has two antenna and uses Alamouti coding, using a number of receive antennas equals to or greater than the number of users (i.e., NR≥ K). Also, it was shown that if there are two users employing rate-1/2 complex orthogonal STBC (OSTBC) the receiver can separate their signals. However, there is no work investigating the scenario when number of user is greater than two and each user has more than two transmit antennas. In this paper we show that if the K users are equipped with four transmit antennas and use rate-1/2 complex OSTBC, the receiver can completely separate the signals of all the users provided NR≥ K/2. For example, in the case of four users the receiver can separate all the signals using two antennas and provides diversity order of two. Numerical results are provided for the uncorrelated Rayleigh fading channel.
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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 | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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".