Re: [Discuss-gnuradio] GSOC 14 project "Vector Network Analyzer"

[zhenhua han]

Taking the average of all datas may works :)

Airprobe uses this method to calculate the phase difference.

Best,

Zhenhua

2014-03-05 19:09 GMT+08:00 MITUL VEKARIYA <address@hidden>:

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

On Wed, Mar 5, 2014 at 7:46 AM, zhenhua han <address@hidden> wrote:

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 <address@hidden>:

Hi

I am Mitul Vekariya - final year student of Electronics and Communication (ECE) branch at Nirma University, India.

I am very interested in mentioned project.

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.

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Regarding Project, I've found one good document from 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

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