Performance Analysis of IEEE 802.15.4a BPSK/BPPM UWB Transmission
Bibliographic record
Abstract
The IEEE 802.15.4a standard uses coded impulse-radio ultra-wideband (UWB) transmission with combined binary phase-shift keying/binary pulse-position modulation (BPSK/BPPM) and direct-sequence spreading with time hopping as physical layer. In this paper, semi-analytical expressions are derived to evaluate the bit-error rate (BER) performance for such a UWB system. Thereby, two different methods for generating reliability information (i.e., decoding metrics) for decoding of the convolutional code at the receiver, the use of time-varying spreading sequences, and suboptimal multipath combining employing a selective RAKE (SRAKE) front-end are included in the analysis. The presented numerical results show that (i) the devised BER approximations are very tight over a wide range of BERs, (ii) symbol-wise metrics are clearly advantageous over bit-wise metrics for decoding, and (iii) SRAKE combining with about 5-10 fingers is sufficient to closely approach the optimal performance for highly dispersive UWB transmission channels.
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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 | 0.000 |
| 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 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".