I am currently working with a USRP B200 mini-i to receive 802.11 signals from various usb wifi devices. When sending packets with the USB device over a channel, lets say 2.412GHz, i can't really see pakets that look like a typical OFDM signal (e.g. with the distinctive preamble). What I rather see is some strange looking signals like seen here
These signals only show up if I am transmitting with the USB device so it is pretty shure that these signals are coming from the device. Also communication works fine between two usb devices so I assume they are not broken. Does someone know what that is? It is saturating the whole rx-end. I tried different sampling rates (10, 20, 40 and 50 Ms/s) and different frequency channels for transmission and reception. I tested several different usb devices and they all show a similar kind of pattern. My Idea was that this is some kind of bad side emission of the device but its amplitude is pretty high. Just a hint would be awesome !