Hi Yan, to be completely honest, at this point it might really be better to point you at a lecture on transmission line and antenna theory. We really don't often do that, but it's not much use that we explain to you how a network analyzer works, if you're the one who wants to build one. I'm also not very optimistic that I could explain the operational principle of a network analyzer, S matrices, directional couplers, isolators, calibration fixtures … better than a textbook. A network analyzer is a complex device, and the math involved for the estimation of the S-Matrices isn't really stuff for a mailing list email.
Basically: Consider this system: https://en.wikipedia.org/wiki/Network_analyzer_%28electrical%29#/media/File:Vna3.png I colored all the components that you /could/ implement using a single B210 USRP in green, and what you'd have to implement on your computer in orange. Coincidentially, /all/ the green parts would be the parts that need calibration. Everything that is neither orange nor green will need to be designed, built, analyzed and calibrated by you: VNA block diag Best regards, Marcus On 15.12.2015 18:35, Yan Huang wrote: > Hi, > > I mean S-parameters in wireless network. How can I use directional couplers > in wireless network to do this? > > Thanks a lot, > Yan > > From: discuss-gnuradio-bounces+eexyh22=nottingham.ac...@gnu.org > [mailto:discuss-gnuradio-bounces+eexyh22=nottingham.ac...@gnu.org] On Behalf > Of Marcus D. Leech > Sent: 15 December 2015 17:16 > To: discuss-gnuradio@gnu.org > Subject: Re: [Discuss-gnuradio] using USRP to get scattering parameters > > On 12/15/2015 11:31 AM, Yan Huang wrote: > Hi all, > > I have tried to use USRP B210 and GNUradio to send and receive signal, and > now I want to get the network's scattering parameters. But I don't know how > to get them using the software. > > Is there anybody can give me some advice? > > Thanks in advance. > > > Yan > > You mean S-parameters, such as you'd get from an RF network analyser? > > You need extra hardware to do that--directional couplers for measuring > forward and reflected power, etc. > > > > > > This message and any attachment are intended solely for the addressee > and may contain confidential information. If you have received this > message in error, please send it back to me, and immediately delete it. > > Please do not use, copy or disclose the information contained in this > message or in any attachment. Any views or opinions expressed by the > author of this email do not necessarily reflect the views of the > University of Nottingham. > > This message has been checked for viruses but the contents of an > attachment may still contain software viruses which could damage your > computer system, you are advised to perform your own checks. Email > communications with the University of Nottingham may be monitored as > permitted by UK legislation. > > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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