GSOC 14 project "Vector Network Analyzer"

GNU Radio
1

Hi
I am Mitul Vekariya https://github.com/mitul93 - final year student of
Electronics and Communication (ECE) branch at Nirma University, India.
I am very interested in mentioned
projecthttp://gnuradio.org/redmine/projects/gnuradio/wiki/GSoC
.
I like digital signal processing, Embedded Linux, Digital Communication
and
RF designing.
I didn’t work on any USRP devices, but I have experience of FPGA
programming using VHDL and LabVIEW. I am familiar with SDR fundamentals
and
GNURadio.

Regarding Project, I’ve found one good document
http://www2.ee.cityu.edu.hk/~sklmmw/apmtt/B2BJan14/day1/Agilent_VNA_AN_Basics_5965-7917E.PDFfrom
agilent.

Summary of what I understood from that document:

  1. Using usrp b210 I can generate pure tone sine wave as test signal
  2. I will connect DUT ( device under test ) with external components to
    the
    usrp and measure transmitted and reflected signal
  3. The amplitude and phase of the received signal will lead to different
    parameters

How can we measure phase between two sine waves using FPGA? The method
of
zero crossing is advised or not?
Please give you inputs on this project.

Thanks
Mitul Vekariya
Institute of Technology
Nirma University
India

2

Hi,
Thanks for reply.
I want to measure phase between reference signal and signal coming from
DUT(Device Under Test). It may possible that due to non-linear
characteristic of the device, there are changes in frequency and
amplitude
of signal. In this case the method you mentioned will give correct
phase?

Thanks
Mitul Vekariya

3

Hi,

How can we measure phase between two sine waves using FPGA?

Supposing the two sine waves have the same frequency.
For two discrete complex signals, v1 and v2. we can compute the phase
difference as follow.

v3 = v1 * conj(v2)
phase diff = arctan(imag(v3) , real(v3))

(conj() means conjugate)

Best,
Zhenhua

2014-03-05 1:36 GMT+08:00 MITUL VEKARIYA [email protected]:

4

Taking the average of all datas may works :slight_smile:
Airprobe uses this method to calculate the phase difference.

Best,
Zhenhua

2014-03-05 19:09 GMT+08:00 MITUL VEKARIYA [email protected]:

5

Hi Martin
Thanks for the reply. Right now I am preparing draft for proposal. As
soon
as I finish my draft I will upload it so that mentors can evaluate it.

6

On 04.03.2014 18:36, MITUL VEKARIYA wrote:

Hi
I am Mitul Vekariya https://github.com/mitul93 - final year student of
Electronics and Communication (ECE) branch at Nirma University, India.
I am very interested in mentioned project
http://gnuradio.org/redmine/projects/gnuradio/wiki/GSoC.
I like digital signal processing, Embedded Linux, Digital Communication
and RF designing.
I didn’t work on any USRP devices, but I have experience of FPGA
programming using VHDL and LabVIEW. I am familiar with SDR fundamentals
and GNURadio.

Mitul,

look at the emails we sent out to the other GSoC applicants (go to the
mailing list archive if necessary). You’ll need to start working on a
proposal. Also, for this project, you’ll need to make sure we know you
know what you’re doing from a signal processing perspective.

M