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## Re: [Discuss-gnuradio] Decimation of multiple streams

 From: Ali Riaz Subject: Re: [Discuss-gnuradio] Decimation of multiple streams Date: Wed, 11 Mar 2015 16:06:13 -0500

Hey Marcus,

So after some thought, I was able to figure out how to do the decimation for multiple streams. I'm sure most of the gurus on this list already know how to do it, but just thought about sharing my 2 cents on how I approached it so that anybody who's still having a similar difficulty can easily solve it.

So I basically used the concept of the hierarchy block and started off with a simple example where I had three streams passing through a constant multiplier block. What I wanted to do was make the generation of these blocks and connections dynamic for as many streams as I see want, so I decided to adjust the python code generated from the hierarchy block, and it turned out to be a really simple fix. I simply added the following, and obviously deleted the redundant part of the code:

self.blocks_multiply_const_vxx = [0]*num_streams

for i in range(num_streams):
self.blocks_multiply_const_vxx[i] = blocks.multiply_const_vff((2, ))
self.connect((self.blocks_multiply_const_vxx[i], 0), (self, i))
self.connect((self, i), (self.blocks_multiply_const_vxx[i], 0))

where num_streams is the number of streams I want. So just using this simple idea, I was able to extend it to the decimation for multiple streams. I've also taken some screenshots so that anyone who's interested can see how I got about to do it: http://imgur.com/a/a0KCX

Best,
Ali

On Sat, Mar 7, 2015 at 3:11 AM, Marcus Müller wrote:
Hi Ali,

no, there's no easy way to have N identical things in GRC.
However, I'm pretty sure you're misusing vector_to_streamS.
There's vector_to_streamS and vector_to_stream, and the second is what you usually want when converting a vector to streams of samples.

Greetings,
Marcus

On 03/07/2015 01:08 AM, Ali Riaz wrote:
Hey guys,

I just had a quick question; if we have multiple streams that need to be decimated, is there a fast way to go about doing that in GNURadio Companion? How would you do it?

Here's a picture of my flow graph: http://imgur.com/a/a0KCX

Thank you for your help!

Best,
Ali

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