[bob1029]

DSSS/FHSS schemes are almost magical in LPI and resilience when applied aggressively in a military setting.

Operating below the noise floor shouldn't be possible at first glance, but through the power of statistics it absolutely is feasible.

[kragen]

Hmm, I notice you mention LPI and resilience but not LPD (low probability of detection). Is DSSS maybe easier than FHSS for an adversary to detect on a waterfall plot and localize with phase correlation if they have a phased array? Or is it also suitable for LPD?