Re: [Discuss-gnuradio] Filter bank and massive “DDD” messages

[Martin Braun]

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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