It think this is absolutely awesome. Would be great if we can make this a subject to our next Google hangout meetup.
Very impressive, thanks for sharing
Amazing, thanks for sharing !!!
Shouldnt the spreading factor be defined the other way though? As in symbols per bit instead of bits per symbol as mentioned in the sheets? If a higher spreading factor means more bits per symbol, then it seems to me that would imply a higher SF would result in a higher datarate.
I thought the spreading factor meant instead the amount of symbols per bit. Leading to a single bit being encoded by multiple symbols resulting in a lower datarate but better receive potential thanks to added redundancy.
The number of bits per symbol indeed increases with the spreading factor, but the symbol rate is Bandwidth/(2^SF) symbols/sec, at that decreases with 2 to the power of the spreading factor. Hence the datarate decreases. Maybe this is not mentioned in the slides.
Ah right thank you. So by increasing SF by one you d̶o̶u̶b̶l̶e̶ HALVE the symbol rate and to compensate (slightly) you also pack a bit more information per symbol.
Almost 
You halve the symbol rate, and add one more bit of information per symbol.