Power Spectral Density Characteristics of MCSK Based Impulse Radios in UWB Communications
Bibliographic record
Abstract
This paper studies the power spectral density (PSD) characteristics of ultra wideband (UWB) signals modulated by M-ary code shift keying (MCSK)/binary pulse position modulation (BPPM) and MCSK/binary pulse amplitude modulation (BPAM), which we refer to as MCSK based impulse radios (IRs). MCSK/BPPM is a recently proposed UWB modulation format that can achieve a high data rate without affecting pulse shaping and further improve the bit-error-rate (BER) performance subject to the same signal energy per bit. The MCSK/BPPM increases the effective time hopping (TH) code period by randomly selecting a TH code from a set of M distinct codes per user. This selection smooths the continuous spectrum and suppresses the discrete spectral components, which is desired for real implementation. For a complete PSD evaluation of MCSK based IRs, also the PSD of MCSK/BPAM is studied. The analysis shows that MCSK/BPPM and MCSK/BPAM systems achieve improved PSD characteristics over the conventional TH-BPPM and TH-BPAM systems. Suggestions are also made to improve the PSD characteristics of conventional TH systems.
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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 | 0.000 |
| 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 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".