Radio: Replaced 1E-12 constants with a value depending on the simulat…

…ion time scale.

The 1E-12 value comes from the fact that simulations run on the picosecond time scale by default.
This is still not ideal but at least the lookahead can go down if the time scale is smaller than picosecond.

Fixed issue #857.

src/inet/physicallayer/wireless/common/radio/packetlevel/Radio.cc

@@ -543,7 +543,7 @@ bool Radio::isListeningPossible() const
     const simtime_t now = simTime();
     const Coord& position = antenna->getMobility()->getCurrentPosition();
     // TODO use 2 * minInterferenceTime for lookahead? or maybe simply use 0 duration listening?
-    const IListening *listening = receiver->createListening(this, now, now + 1E-12, position, position);
+    const IListening *listening = receiver->createListening(this, now, now + SimTime::fromRaw(1), position, position);
     const IListeningDecision *listeningDecision = medium->listenOnMedium(this, listening);
     bool isListeningPossible = listeningDecision->isListeningPossible();
     delete listening;

src/inet/physicallayer/wireless/ieee802154/bitlevel/Ieee802154UwbIrTransmitter.cc

@@ -82,7 +82,7 @@ void Ieee802154UwbIrTransmitter::generateSyncPreamble(std::map<simsec, WpHz>& da
             if (Ieee802154UwbIrMode::C31[Ieee802154UwbIrMode::Ci - 1][pos] != 0) {
                 if (n == 0 && pos == 0)
                     // we slide the first pulse slightly in time to get the first point "inside" the signal
-                    time = 1E-12 + n * cfg.sync_symbol_duration + pos * cfg.spreadingdL * cfg.pulse_duration;
+                    time = SimTime::fromRaw(1) + n * cfg.sync_symbol_duration + pos * cfg.spreadingdL * cfg.pulse_duration;
                 else
                     time = n * cfg.sync_symbol_duration + pos * cfg.spreadingdL * cfg.pulse_duration;
 //                generatePulse(data, time, startTime, C31[Ci - 1][pos], IEEE802154A::maxPulse, IEEE802154A::mandatory_pulse);