Hi, > On 30 Jan 2017, at 07:25, Nikita Airee <nikit...@iiitd.ac.in> wrote: > > I have a certain update regarding my issues and I'm hoping get some new > perspective. > > I repeated my experiments randomizing the mac addresses and payload. You were > quite right that the issue might be related to suboptimal waveform. Because > sequence numbers which were always erroneous seemed to change. However, there > were still certain numbers which were constantly wrong through the randomized > frames. > > Then I found a Usrp 2922 which I believe is n210. Surprisingly, when used as > a tx, 2922 doesn't give those deterministic errors and the total frame error > rate too decreased drastically to around 1-1.5% from 4-5%. Also the > constellation is visibly better. >
great. > Is the value of fer acceptable at 1-1.5% or should there be absolutely 0 > errors. It depends totally on why you are setting up these experiments in the first place. If there is no interference from other devices it’s totally possible to reach 0%, but if it is required in your case, i don’t know. > Also could there be something wrong with my Rios? If one SDR works and the other doesn’t it might be because the other SDR: - needs different parameters - uses a different/broken driver - is broken Maybe you could test the other SDR with different transceivers. Best, Bastian > > Bests, > Nikita > > On Jan 17, 2017 10:21 PM, "Bastian Bloessl" <bloe...@ccs-labs.org > <mailto:bloe...@ccs-labs.org>> wrote: > Hi, > > > On 01/17/2017 11:13 AM, Nikita Airee wrote: > > - Make sure that the xy plot shows clear constellations. > > tx_gain is set to 30dB and rx_gain to 0. > > > If constellations don't look nice, you could try lowering the tx and > increasing the rx gain. (also make sure that the antennas are > connected to the correct ports). > > > The constellation is kind of clear(PFA the screenshot). Decreasing tx > gain and increasing rx gain doesn't help either. > > I even tried repeating the experiment with a different set of x310s but > there was absolutely no change. Would you still say that it could be an > error in my hardware? > > Also, another observation, the error in these frames seems to be around > the same area of that particular frame everytime. Could this mean something? > > Unfortunately, I don't have the hardware to try. > > Since you always loose the same frames it sounds like a bug in the receiver, > but then they should also be dropped in simulations. > > The last idea would be that this particular frames are mapped to a suboptimal > wave form (high PAPR?) The constellations already look like the gain is too > high. Maybe frames with high peak amplitudes get dropped. > > Best, > Bastian -- Dipl.-Inform. Bastian Bloessl Distributed Embedded Systems Group University of Paderborn, Germany http://www.ccs-labs.org/~bloessl/
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