First of all I am using Matlab 2019a with the latest update. I reused the Simulink example that's provided by Matlab (wlan/HTLinkModelWLANExample). However, I modified it to simulate packet error rate (PER) in case of very narrow band (VNB) GMSK-based interference (~100Hz) instead of AWGN noise (SNR is actually set to 50 dB). Based on my thorough practical measurements in the anechoic chamber, I was expecting similar results in Simulink, but I got different ones as well as different/unexplained behavior.
The two main issues in Simulink I have trouble with are:
1. Given the same SIR, the PER performance in case the VNB interference coincides with a pilot sub-carrier is better than that when it coincides with a data sub-carrier. This is contradicting with my measurements which clearly indicate the opposite.
2. Given the same SIR, some data sub-carriers (e.g. 12 -- 15) are clearly more resilient to the VNB interference compared to other data sub-carriers (e.g. 16 -- 19). This is again contradicting with my measurements which indicate that the PER performance is more or less the same regardless of which data sub-carrier is interfered with.
I would appreciate any help/suggestion/clarification. Please let me know if more clarification about the simulation/measurements is needed.
p.s. I attached the modified Simulink file.
SIR = total WiFi-signal-power to VNB-interference-power ratio
Thanks in advance.