I. ABSTRACT A Commercial 155MBitls SOH Satellite Modem Compatible with Existing 72 MHz Satellite Transponders
Bibliographic record
Abstract
This paper presents the world's first commercial 155 MBit/s 8-PSK satellite modem compatible with existing 72 MHz satellite transponders. Applications include fiber restoration; bringing B-ISON to remote or temporary sites; SOH broadcasting. The design relies on an advanced coding/modulation scheme and state-of-the-art signal processing to achieve excellent power/bandwidth performance and robust synchronisation. The IF-loop back BER1F is 10-10 @ Eb/No = 7.95 dB, corresponding to a modem implementation loss of only 0.4 dB. The error-correction scheme consists of a rate 8/9 six-dimensional trellis code with 64 states, plus a rate 235/255 Reed-Solomon outer code. Both classical symbol interleaving and a novel bit error despreader are used to match inner and outer code. The soft-decision trellis decoder is built around a single standard CMOS Viterbi decoder chip. A new 8PSK carrier synchronisation algorithm achieves the Cramer-Rao performance bound at SNR near the coding threshold. The RF performance over non-linear satellite channels has been assessed with an INTELSAT VI Satellite Simulator, and during field tests between UK and Canada over an INTELSAT-VA. These tests demonstrate that the modem is robust in the presence of channel impairments. In particular it was shown that standard line-up procedures are adequate, and no special channel equalisation is needed.
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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 | 0.000 | 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 | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.012 | 0.002 |
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".