BER calculation

[Midjuhaki]

Greetings,

I am currently trying to analyse LoRa network in terms of Bit Error Rate vs SNIR for different Spreading Factor values, but I am unable to "induce" bit errors. Theoretically, it's expected for BER to rise in value after SNIR falls below at least -25 dB, but even after configuring 'snirTreshold' parameter to -60 dB, lowering GW receiver sensitivity to a few hundreds of -dBm, lowering transmitter power, changing parameters of path loss model and changing distance between end node and GW, also in 'LoRaMedium.ned' I have increased the 'backgroundNoise.power' parameter to over 0dBm (but it doesn't seem to have any effect on results), all for sake of achieving very low SNIR value, but mean value of BER is always zero and lowest SNIR is 0.6.

If you could help me solve this issue, I would be very grateful to you.