discuss-gnuradio
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Discuss-gnuradio] Packet encoding example (Packet_loopback_hier.grc


From: Dan CaJacob
Subject: Re: [Discuss-gnuradio] Packet encoding example (Packet_loopback_hier.grc)
Date: Sat, 26 Aug 2017 16:54:02 +0000

I am offering advice without looking at the flowgraph, so take this with a grain of salt, but sps usually stands for samples per *symbol*, not seconds.

On Sat, Aug 26, 2017 at 4:04 AM Marcus Müller <address@hidden> wrote:

Hi Mehtap,

huh, if increasing sps = 100 is all that it takes to trigger this, then this is probably¹ a bug. And as such, we should fix it. Just to confirm: If you take a totally unmodified packet_loopback_hier.grc and **only** change sps=100, then you get this?

Generally, sps=100 seems… unintuitive. Use something like sps=20 and interpolate by 5? The ISI suppression gain you get from a longer RRC will decrease with growing RRC length.

Best regards,

Marcus

¹: I say "probably", because I don't have packet_rx in front of me right now, and there might be a "logical" limitation, where something else depends on sps and another factor, and you'd have to adjust that other factor, too, for the flow graph to "make sense".
On 25.08.2017 21:33, mehtap özkan wrote:
Thanks to Marcus Müller I became aware of the Packet TX and RX blocks.
 I use the Packet_loopback_hier.grc example. However the example is set to 2 samples per seconds=sps. When I try to increase sps=100, the number of taps of the RRC filter becomes( 5*sps*nfilts) exceeds its limit.
 I get 
../.grc_gnuradio\packet_rx.py", line 49, in __init__
    self.mark_delay = mark_delay = mark_delays[sps]
IndexError: list index out of range
  
Is there another way to increase the speed limit?

Thanks


_______________________________________________
Discuss-gnuradio mailing list
address@hidden
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

_______________________________________________
Discuss-gnuradio mailing list
address@hidden
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
--
Very Respectfully,

Dan CaJacob

reply via email to

[Prev in Thread] Current Thread [Next in Thread]