CONTESTED-CHANNEL STRESS TEST · SPACE & DEFENSE

Latent Radio, under fire

The shared-model transceiver from Latent Radio, retrained and stress-tested against what deep-space and jammed military links actually face: burst jamming (chunks of the signal wiped out), deep fades, and extreme low SNR. The question — does "meaning survives damage" hold up when the channel is actively hostile, not just noisy?

Why this technology fits space & defense. These are closed systems — one operator controls both the transmitter and the receiver — so the shared-model requirement that sinks consumer use is a natural fit (and doubles as implicit keying). They are bandwidth- and power-starved, with no retransmission (a Mars round-trip is tens of minutes; you can't ask again under jamming). That is exactly the regime where graceful degradation beats a digital cliff.

Result — jam-resistance

−2.5 dBcontested-trained model, 0% → 70% burst jamming
vs
−7.7 dBsame model trained for clean noise only

Trained through the threat, the link barely flinches as a jammer wipes out up to 70% of the signal. At 70% jamming it holds 17.0 dB — versus 12.9 dB for the clean-noise model (which collapses below even the classical baseline) and 14.3 dB for idealized digital.

contested-trained (threat-aware)AWGN-only model (ablation)classical digital, idealized
12 14 16 18 20 22 0% 10% 20% 30% 40% 50% 60% 70% burst jamming — fraction of signal wiped out reconstruction PSNR (dB)
The honest lesson is the red line: a transceiver tuned for clean noise — stock Latent Radio — degrades badly under jamming, worse than classical digital. Robustness isn't automatic; it comes from training through the actual threat model. Do that, and the shared-model system is remarkably jam-resistant.

See it — images under jamming

Top: originals. Next three rows: contested-trained at 0%, 25%, 45% jamming — still clearly readable. Then the clean-noise model and classical digital at 45% jamming, both visibly worse.

Extreme low SNR, with jamming

Holding a 25% jammer on, sweeping the noise floor. Below −4 dB the digital link runs out of capacity and drops to the blank-image floor; the shared-model system keeps delivering a recognizable picture.

contested-trainedclassical digital, idealized
10 12 14 17 19 21 -8 -6 -4 -2 0 2 4 6 8 10 12 blank-image floor channel quality — SNR (dB) reconstruction PSNR (dB)

What this is / isn't

Is: honest evidence that the shared-model / joint-coding idea holds up under contested conditions — burst jamming, fades, extreme SNR — and a demonstration that you must train for the threat to get there. The closed-system nature of space and defense makes the approach a natural fit.

Isn't: a deployable system. This is a simulation with idealized channel models (real RF adds Doppler, timing, hardware limits, adaptive jammers). Two more honest cautions specific to these domains: a neural decoder can hallucinate plausible-but-wrong detail — dangerous for science or targeting data, so you'd send verifiable residuals — and a shared model is not cryptography (layer real crypto on top). The digital baseline here is deliberately generous (ideal interleaving), so the true classical cliff under bursts is harder than shown; the neural advantage is if anything understated.

Reproduce: python3 train_contested.py && python3 evaluate_contested.py && python3 make_report.py