I am trying to compare LoRa with FSK in terms of transmission speed and receiver sensitivity. When setting both LoRa and FSK to a comparable effective bit rate, around 600 bits per second, according to datasheets, LoRa achieves a receiver sensitivity of -132 dBm, whereas FSK has a sensitivity of -125 dBm. However, the advantage of FSK, if I understand correctly, is its much narrower bandwidth. While LoRa uses a bandwidth of 125 kHz, FSK requires only 4 kHz. Therefore, my question is how practical are these 4 kHz and how many channels could theoretically be placed side by side in a 125 kHz bandwidth so that they could operate in parallel with the stated sensitivity of around -125 dBm. Is it possible to compare this in some way? Theoretically, we could have up to 30 channels of 4 kHz in a 125 kHz bandwidth, which would mean the ability to communicate on approximately 30 times more channels simultaneously?
I am also interested in the opposite setting - setting the modulations so that they have the same RX sensitivity. If I do this and the surroundings are not interfered with by any other signal, can I expect communication over the same distance with both LoRa and FSK modulation?
Thank you for any reason.