From mboxrd@z Thu Jan 1 00:00:00 1970 From: mahaveer gupta Date: Wed, 23 Jul 2014 15:34:34 -0500 Subject: [ath9k-devel] Spectral Scan In-Reply-To: References: Message-ID: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ath9k-devel@lists.ath9k.org 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 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 > 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 at lists.ath9k.org >> https://lists.ath9k.org/mailman/listinfo/ath9k-devel >> >> > -- Thanks, M -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.ath9k.org/pipermail/ath9k-devel/attachments/20140723/4d6e17c9/attachment.htm