Hi, The NIC is either receiving frames or doing spectral scan. It can't unfortunately do both.
-a On 23 July 2014 13:34, mahaveer gupta <mgupta1...@gmail.com> wrote: > Thanks for the answer. Indeed, we thought similar to what you suggest but > realized that the actual packets still need to be decoded to be able to > match the spectral samples with decoded packets (by matching the hardware > timestamp values). Hence this was a little tricky. > > If we use a 40Mhz scan on a 20MHz transmission, how would it be possible to > distinguish the spectral samples corresponding to 20MHz packets and those > corresponding to background noise. > > RSSI could be a weak discriminator. > > > On Wed, Jul 23, 2014 at 2:50 PM, Kamran Nishat <kamran.nis...@gmail.com> > wrote: >> >> hi >> yes this is the expected behaviour. one can only get spectral scans for >> things cannot be decoded as valid packets by HW. One way to receive scans >> for packets is to scan on 40MHz channel while sending traffic on a 20Mhz >> sub channel. >> >> kamran >> >> >> On Thu, Jul 24, 2014 at 12:29 AM, mahaveer gupta <mgupta1...@gmail.com> >> wrote: >>> >>> Hello, >>> >>> We have been able to use the spectral scan feature successfully - >>> http://wireless.kernel.org/en/users/Drivers/ath9k/spectral_scan >>> >>> However, samples are being skipped while the device is receiving packets. >>> The spectral samples we see correspond to background noise while no packet >>> is being received. >>> >>> Wondering if this behavior is expected and if yes, kindly let me know if >>> you have a suggestion to change that. We would like to see the spectral >>> samples corresponding to successfully decoded packets. We tried all three >>> modes without any success so far. >>> >>> We are using AR 9271 Chipset with the usual firmware. >>> >>> -- >>> Thanks, >>> M >>> >>> _______________________________________________ >>> ath9k-devel mailing list >>> ath9k-devel@lists.ath9k.org >>> https://lists.ath9k.org/mailman/listinfo/ath9k-devel >>> >> > > > > -- > Thanks, > M > > _______________________________________________ > ath9k-devel mailing list > ath9k-devel@lists.ath9k.org > https://lists.ath9k.org/mailman/listinfo/ath9k-devel > _______________________________________________ ath9k-devel mailing list ath9k-devel@lists.ath9k.org https://lists.ath9k.org/mailman/listinfo/ath9k-devel
