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Re: [Discuss-gnuradio] Filter bank and massive “DDD” messages
From: |
Martin Braun |
Subject: |
Re: [Discuss-gnuradio] Filter bank and massive “DDD” messages |
Date: |
Tue, 23 Jun 2015 09:20:42 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 |
Luis,
can you please confirm/deny that streaming e.g. into a null sink works?
Thanks,
Martin
On 23.06.2015 09:16, Luis Grajales wrote:
> Hi,
>
>
> I'mtrying to filter 14 frequency bands (channels), which are
> dispersingwithinspectrum of 25 MHz (from 2 MHz - 27 MHz to be more
> specific) and each band has a different bandwidth. For example: 1th
> channel with 198 KHz (bandwidth), 2nd channel with 360 kHz, 3. channel
> with 650 kHz, and so on.
>
>
>
> Until now, I have tried 3 scenarios on GRC in order to get these 14
> channels and verify that the first step of my project (filtering) is
> working. For testing, I used just 4 of the 14 channels to see its
> functionality and CPU requirement.
>
>
>
> General configuration:
>
>
> USRP N200 ----------- channelizer --- [ch1] -----GUI FFT Sink
>
> ----[ch2 - ch4] ----
> Null Sink
>
>
> USRP setup -> samp_rate= 25 MHz, and Center Freq = 14,2 MHz.
>
>
> Scenario 1: channelizer = 4 band pass filters.
>
> Scenario 2: channelizer = 4 Xlating FIR filters.
>
> Scenario 3: channelizer = Polyphase channelizer, 5 equal channels of 5 MHz.
>
>
>
> For the 3 configurations I got massive “DDDDD..” at the console output.
> Moreover:
>
> Scenario 1: CPU 100% and stop the application.
>
> Scenario 2: CPU between 75 % and 95 %.
>
> Scenario 3: CPU between 53 % and 95 %
>
>
>
> Therefore, I really appreciate if you could give me some tips to avoid
> this massive “DDD” messages or alternatives to optimize the resource
> consumption for the filter bank, due to the results showed that the band
> pass filter (scenario 1) will not be a good option for me, or maybe I
> did something wrong.
>
>
>
> In the attached files you will find the 3 different GRC configurations.
>
>
> Thanks in advance,
>
>
> Luis Grajales
>
>
>
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