Error in noise computation due to time resolution

[aarizaq]

I am working with an implementation of sound transducer, and I am using the Radio class as base.
I have modified the time resolution and I have found that the noise computation doesn't work if the time resolution is smaller than 1e-12.
The reason is this method "bool Radio::isListeningPossible() ", specifically here:
const IListening *listening = receiver->createListening(this, now, now + 1E-12, position, position);

With resolutions smaller than 1e-12 the isotropic noise computation is infinite because now = now + 1E-12.

I have solved this problem with this code

double delta = 1E-12;
double exponent = now.getScaleExp();
if (exponent > -12)
delta = std::pow(10.0, exponent);
const IListening *listening = receiver->createListening(this, now, now + delta, position, position);

[aarizaq]

I think that this solution is more elegant
aarizaq@15f58b9
Or better this
aarizaq@60b2d27

Also, Ieee802154UwbIrTransmitter::generateSyncPreamble uses 1E-12.