I think things are a bit confusing, but here goes. The earlier NICs only support either RX STBC (pre ar9280?) or TX 1-stream STBC (ar9280 or above). Multi-stream STBC isn't in any of the AR9xxx NICs. It may be in the AR9287; it may be in the AR9300/AR9400. I've not looked. I bet what you're finding is: * with STBC enabled, for single stream rates, it's tx'ing using STBC. It just sets a bit in the TX descriptor. * with STBC enabled, for multi-stream rates, it's not setting the STBC TX bit and it's instead sending it as a 2 stream packet w/out STBC. The AR9280 is not a one stream NIC - it's a two stream TX/RX NIC. (Unless you're using the AR9281 - which is an AR9280 1T2R stream device.) The AR9285 is a 1x1 stream device. The AR9287 is a 2x2 stream device. HTH, Adrian > I am using STBC (Space Time Block Coding) 1 stream NICs like the AR9280.I would be very grateful someone can kindly advise on how exactly STBC(transmits multiple copies of a data across each of the antennas) works in ath9k. > I ask this because when I enable STBC 1-stream, the driver seems to uses Space division multiplexing (can this be disabled/enabled?), since the rate is over 150Mbps. > When is STBC activated ?, ...Does Minstrel/ath9k rate adaptation mechanism find first check if Spatial multiplexing is better, if not uses STBC ? > Thank you for your time > _______________________________________________ > ath9k-devel mailing list > ath9k-devel@xxxxxxxxxxxxxxx > https://lists.ath9k.org/mailman/listinfo/ath9k-devel > -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
