Hi, 2016-05-07 9:16 GMT+02:00 <schnitzba...@teco.edu>: > ... > 1. Detect the start of packets based on the increased signal strength > that can be seen in the spectral scan samples.
Are you sure that this is possible? In my observation your spectral sample stream get interrupted by an decoded frame. The start of the frame is not visible and there is a small gap between the last spectral sample and the start of the decoded frame. If you merge the power information of the spectral samples and frame it looks like http://imgur.com/xAWleMY X-axis: subcarrier frequencies 1 per px, y-axis: time, 1 pixel = 115us, captured tl-wn722n with ath9k_htc v1.4 Not sure about the overlap at the end of the frame, probably my tx_time calculation is not accurate enough. > 2. Use two devices as receiver. One decodes the frames, the other > captures spectral scan. Synchronize the captures based on the MAC > timestamps produced by both chips. Please share how it is possible to convince the hardware not to decoded the frame and give only spectral samples instead. > You may know this paper: dl.acm.org/ft_gateway.cfm?id=2000029 . > Domenico Giustiniano did a busy loop within the driver code to solve > the problem with unpredictable scheduling. He is currently working on > a broadcom platform with a custom firmware The full text paper is also available: http://dl.acm.org/citation.cfm?id=2079306 http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.381.1215&rep=rep1&type=pdf > ... Best, Robert _______________________________________________ ath9k-devel mailing list ath9k-devel@lists.ath9k.org https://lists.ath9k.org/mailman/listinfo/ath9k-devel
