Re: [Discuss-gnuradio] using USRP to get scattering parameters

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

Re: [Discuss-gnuradio] using USRP to get scattering parameters

On 12/15/2015 12:35 PM, 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 Ah. That's a slightly different thing, so, just ignore my comment about directional couplers.

Re: [Discuss-gnuradio] using USRP to get scattering parameters

Hi Yan, With the same antenna: That is going to be impossible, because you can't TX and RX on the same port with a USRP. Also, the TX would be extremely loud and possibly even damage RX. Calibration: Measure a known loopback channel (ie. a cable with an attenuator that you've measured with a

Re: [Discuss-gnuradio] Tag preemption USRP sink

Hi, I replaced the Frequency Xlating FFT filters with FIR filters, used the Low-Pass Filter Taps block to generate taps (since I can’t get my head around this notation), and removed the filter from the first conversion. Now, it seems to work. At least it receives frames. If you still have

Re: [Discuss-gnuradio] using USRP to get scattering parameters

Hi Marcus, I want to analyse the wireless network in single channel with the same antenna. And how can I calibrate the random phase offset with B210? Thanks, Yan -Original Message- From: discuss-gnuradio-bounces+eexyh22=nottingham.ac...@gnu.org

Re: [Discuss-gnuradio] using USRP to get scattering parameters

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

[Discuss-gnuradio] using USRP to get scattering parameters

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 This message and any attachment

Re: [Discuss-gnuradio] Tag preemption USRP sink

Each stream has been shiffted with the xlating block. The intention is to "split" a 20 MHz wide analog channel into two of 10 MHz. Each 10 MHz channel transmit its own ofdm frame. I attached the flowgraph for more details. thanks in advance. On 15 December 2015 at 17:42, Martin Braun-2 [via

Re: [Discuss-gnuradio] Tag preemption USRP sink

tP indicates you're using corrupt tagged streams, maybe your add block is overlaying them? I'm also not entirely sure what you mean by 'simultaneous parallel transmissions'. Are they on different frequencies? Are you mixing them together in baseband? Cheers, Martin On 15.12.2015 04:10, Saulo

Re: [Discuss-gnuradio] using USRP to get scattering parameters

Hi Marcus, I'm sorry, I want to Say using two same kind of antennas as TX and RX respectively in one B210 board. And how can I get the S-parameters? Thank you, Yan -Original Message- From: Marcus Müller [mailto:marcus.muel...@ettus.com] Sent: 15 December 2015 17:44 To: Yan Huang;

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

Re: [Discuss-gnuradio] using USRP to get scattering parameters

Hi Yan, that is an extremely broad question; what kind of network analyzer do you have in mind? Notice that you will have to calibrate the B210 random TX/RX phase offset after every tune. Best regards, Marcus On 15.12.2015 17:31, Yan Huang wrote: > I have tried to use USRP B210 and GNUradio to

Re: [Discuss-gnuradio] gr-lte：can't decode MIB

-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi Kevin, First of all, all those D's indicate that you drop packets. Record your samples and use a File source in your flowgraph to get rid of this. The flowgraph should decode 10 CFI's per frame while it decodes one MIB at most. Deactivate the

Re: [Discuss-gnuradio] (no subject)

Hi Vinay, > Really sorry for images sizes Don't be sorry! A few hundred kilobyte won't break the mailing list, and it's always a good thing to illustrate your system well; I've spent much (too much?) time in university labs, and believe me, there's nothing more crucial about science and

[Discuss-gnuradio] Tag preemption USRP sink

Hi all, I'm trying to Tx a same tagged stream simultaneously through two analog orthogonal channels. The flow path of each stream copy is: resampling, adjust tag lenght and xlating FFT filter (with shifting). After this I take the output of each filter and put into and add block then to the USRP

[Discuss-gnuradio] Can wrong connection of spyverter damage it ?

Hi, I recently purchased the airspy/spyverter combo. The spyverter did not have any markings indicating antenna input and output. Assuming that the lettering on the top of the two devices lined up I initially wrongly connected the antenna input of spyverter to the input of the airspy and ran

Re: [Discuss-gnuradio] Can wrong connection of spyverter damage it ?

It it quite possible that you damaged it. You should contact the airspy folks to be sure though - http://airspy.com/contact/ On Tue, Dec 15, 2015 at 4:18 PM, Patrick Sathyanathan wrote: > Hi, > > I recently purchased the airspy/spyverter combo. The spyverter did not > have

[Discuss-gnuradio] Information Comments

Hi, Each time a program (that requires USRP usage, i.e. spectrum_sense_py) is executed, it’s printed some comments such as these: linux; GNU C++ version 4.9.2; Boost_105400; UHD_003.010…. Using Volk machine: … Opening a USRP2/N-Series device... -- Current recv frame size: 1472

Re: [Discuss-gnuradio] gr-lte：can't decode MIB

Hi,johannes,I deactivate the PCFICH block and the results are shown below. The source file is recorded from USRP N210 with a samp_rate of 15.36M, but the results showed of "ofdm_lte_remove_cp_cvc_0 OUT of sync. I don't know what the problem is,please help me ,thank you.

Re: [Discuss-gnuradio] (no subject)

Hi, This is regarding x and y axis of graph what I have posted in last post. (1)Y-axis is amplitude and (2)X-axis is frequency.Amplitude remains constant and frequency has to be increase in terms of steps(60MHz). Examples what I have referred for CW is USRP echotimer _CW in (exaples USRP) and

Re: [Discuss-gnuradio] Enabling GR_LOG messages

On Mon, Dec 14, 2015 at 10:52 AM, Meelis Nõmm wrote: > Hello everyone, > > I'm writing a (test python) block for usrp_source frequency retune. > Marcus gave a pretty good base line for the solution in [1] >