Re: [Discuss-gnuradio] Problem with underruns

[Marcus Müller]

Hi Sverre,

hm, I've taken the time to look at pulse_shaper_bs.py[1], but I didn't fully understand what it does, mathematically/technically.

It does in fact look like a very complicated way to do something that I'm not 100% sure wouldn't be covered by a simple FIR filter, but lacking a bit of documentation, and not finding the time to go into all the if()-cases right now, can you explain what it does?

You told me the bit rate, but not the sampling rate of the USRP sink, but that would be very relevant here!

Best regards,
Marcus

[1] https://github.com/sverrets/dsrc/blob/master/gr-dsrcmod/python/pulse_shaper_bs.py

On 03/17/2017 01:04 PM, Sverre Turter Sandvold wrote:

Hi, thank you for answering!

I'm using a USRP N200 with a CBX daughterboard.

I think the problem is that the block "pulse_shaper_bs" is not processing fast enough, and then the USRP Sink don't receive data fast enough and this causes the underrun.

I want to send a packet with bits to a DSRC-unit. The main specs are:

• Carrier Frequency: 5,8025 GHz
• Modulation: Two level amplitude modulation
• Data Coding: FM0
• Bit rate: 500 kbit/s

SverreTS

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Fra: Discuss-gnuradio <address@hidden> på vegne av Marcus Müller <address@hidden>
Sendt: 16. mars 2017 19:38
Til: address@hidden
Emne: Re: [Discuss-gnuradio] Problem with underruns

 

Hi SverreTS,

can you be more specific? Why do you think it's the problem? Can you give us a rough idea of what your program does? At which rates are you working, with which hardware, and so on.

Best regards,

Marcus

On 03/16/2017 01:52 PM, Sverre Turter Sandvold wrote:

Hi!

Need some help with this gnuradio-block called "pulse_shaper_bs": https://github.com/sverrets/dsrc/blob/master/gr-dsrcmod/python/pulse_shaper_bs.py used in this program: https://github.com/sverrets/dsrc . I got alot of underruns and think the "pulse_shaper_bs" is causing the problem.

Anyone want to help?

SverreTS

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