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hmmm - I'm not sure where this new thread stemmed from (?) - so - I'm not sure if the whole question is phrased in the message. Resilience is opposite to susceptible. Spread spectrum - developed during the war to ensure our signals "got through" to the intended receiver without being jammed - are certainly more resilient to narrowband noise, than is a narrowband signal (assumed to be on the same frequency as the noise).

Resilience is only one attribute of communication - and, just because something is resilient, doesn't mean it's optimum. FHSS is the most resilient (a spread spectrum result of a hopping narrowband signal) - because it can "move" away from the noise, and try to resume transmission. Bluetooth is able to modify the hop pattern to avoid the noisy area (ie DSSS). But FHSS requires lots of dead time to move and adjust to new frequencies; only very old systems communicate this way - at 1 - 2 MBps.

Orthogonal (OFDM) is more resilient than DSSS, because of how it uses redundancy within the 48 data-carrying freqs withing the 52 sub-bands used of the 20 MHz signal. The more redundancy supported on the 48 freqs, the slower the communication - but - the communication arrives.

So in all cases - spread spectrum is more resilient (OFDM is not technically spread spectrum, but behaves with similar qualities) - AS COMPARED TO - a stationary (non-hopping) narrowband source of noise. Any noise too loud (which will make it bleed into neighboring channel territory) will obliterate communication.