On Mon, Feb 10, 2020 at 02:32:06PM -0800, Matthew Wang wrote: > The estimated throughput calculation done in wpa_supplicant/scan.c is > based on a step function that maps SNR to a bitrate [0]. As I > understand it, these bitrates come from something like mcsindex.com > that maps an MCS index to the corresponding maximum bitrate. My > question is this: where do the SNR to MCS index mappings come from, > and why do they differ from another table I have found [1]? > > [0] https://w1.fi/cgit/hostap/commit/wpa_supplicant/scan.c?id=a1b790eb9d75 > [1] https://d2cpnw0u24fjm4.cloudfront.net/wp-content/uploads/80211-Data-rates-and-snr-requriements-screen-shot.png This is from five years ago and unfortunately I could not easily find my notes for that and I don't remember the details. I think I used two different tables (one for the legacy rates and another one for the HT/VHT MCS values) and calculated the SNR values based on the tables showing minimum RSSI. -- Jouni Malinen PGP id EFC895FA _______________________________________________ Hostap mailing list Hostap@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/hostap
