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 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 | 0.000 | 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".