Re: [Discuss-gnuradio] [USRP-users] USRP, GNURadio Companion, Polyphase Channelizer Issue

On 02/13/2015 07:35 PM, Ali Riaz via USRP-users wrote:

My apologies for the second email, but I don't think the images went through the first one, so I'm attaching the images this time around.

Thank you once again!

Best,

Ali

Also, as a point of order, this type of question (which is basically about Gnu Radio signal design) is best asked on the discuss-gnuradio
  mailing list, so perhaps follow-ups can go there.

On Fri, Feb 13, 2015 at 6:05 PM, Ali Riaz <ariaz1@hawk.iit.edu> wrote:

Hi there!

I recently installed the latest version of GNURadio and UHD on my computer, and I'm currently using the GNURadio Companion for a small project, and it requires me to use the Polyphase Channelizer. I've tried looking for some examples, but there's not too much to go on unfortunately. So, I'm hoping someone can assist me on this. What I have right now is that I've connected the USRP with a Spectrum Analyzer, and I'm using the Spectrum Analyzer's Tracking Generator to send some power into the USRP at a center frequency of 4.3 GHz.

In GNURadio Companion, USRP Source block has a sample rate of 2Msps, and for starters, I want to use the channelizer to divide this input into 4 equal channels. From the very basic understanding I have about the channelizers, I've set up my blocks as follows:

And for the taps, I'm using the visual GNURadio Filter Design tool as follows:

My question is, am I doing this correctly? Or am I missing something, because the output that I'm getting is not exactly correct. Would really appreciate if someone can point me to the right direction.

Thank you in advance for your help!

Best,
Ali

  
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