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List:       gnuradio-discuss
Subject:    Re: [Discuss-gnuradio] trap divide error in using OFDM carrier allocator
From:       Jeon <sjeon87+gnuradio () gmail ! com>
Date:       2016-12-22 11:39:19
Message-ID: CACfn7v5BXPC2HfcP1Cj9hriuNQzw=WiacmyVSEJocFJbB-rpdg () mail ! gmail ! com
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Ah, never mind.

I declared occupied/pilot carriers and sync words incorrectly. For example,

it must not be ((-3, -1, 1, 3)) but must be (-3, -1, 1, 3),). I forgot
putting a comma.

Regards,
Jeon.

On Thu, Dec 22, 2016 at 5:14 PM, Jeon <sjeon87+gnuradio@gmail.com> wrote:

> I made a simple flow graph using OFDM Carrier Allocator. Please see the
> attachment. If the attachment is not available, screenshot of it can be
> found at http://imgur.com/v7aPL7J
> (Almost same as http://gnuradio.org/doc/doxygen-3.7/page_ofdm.html#ofdm_tx
> )
>
> When I run the flow graph, it immediately stops running. To debug, I look
> into `dmesg`, and it shows:
>
> *[12785.433257] traps: ofdm_carrier_al[23633] trap divide error
> ip:7fe08fb3f375 sp:7fe073ffe610 error:0 in libgnuradio-digital-3.7.10git.*
> *so.0.0.0[7fe08faa2000+f4000]*
>
> It's somewhat frustrating because I didn't modify the OFDM Carrier
> Allocator block. Could anyone suggest a starting point to debug it?
>
> OS is Ubuntu 14.04, kernel 3.13.0-96, 64-bit
> GNU Radio version is v3.7.9.2
> If more information is required, please let me know it.
>
> Regards,
> Jeon.
>

[Attachment #5 (text/html)]

<div dir="ltr"><div><div>Ah, never mind.<br><br></div>I declared occupied/pilot \
carriers and sync words incorrectly. For example,<br><br></div><div>it must not be \
((-3, -1, 1, 3)) but must be (-3, -1, 1, 3),). I forgot putting a \
comma.<br><br></div><div>Regards,<br></div><div>Jeon.<br></div></div><div \
class="gmail_extra"><br><div class="gmail_quote">On Thu, Dec 22, 2016 at 5:14 PM, \
Jeon <span dir="ltr">&lt;<a href="mailto:sjeon87+gnuradio@gmail.com" \
target="_blank">sjeon87+gnuradio@gmail.com</a>&gt;</span> wrote:<br><blockquote \
class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"><div dir="ltr"><div><div><div><div>I made a simple flow graph \
using OFDM Carrier Allocator. Please see the attachment. If the attachment is not \
available, screenshot of it can be found at <a href="http://imgur.com/v7aPL7J" \
target="_blank">http://imgur.com/v7aPL7J</a><br></div><div>(Almost same as <a \
href="http://gnuradio.org/doc/doxygen-3.7/page_ofdm.html#ofdm_tx" \
target="_blank">http://gnuradio.org/doc/doxyge<wbr>n-3.7/page_ofdm.html#ofdm_tx</a>)<br></div><div><br></div>When \
I run the flow graph, it immediately stops running. To debug, I look into `dmesg`, \
and it shows:<br><br><b>[12785.433257] traps: ofdm_carrier_al[23633] trap divide \
error ip:7fe08fb3f375 sp:7fe073ffe610 error:0 in \
libgnuradio-digital-3.7.10git.</b><b><wbr>so.0.0.0[7fe08faa2000+f4000]</b><br><br></div>It&#39;s \
somewhat frustrating because I didn&#39;t modify the OFDM Carrier Allocator block. \
Could anyone suggest a starting point to debug it?<br><br></div><div></div><div>OS is \
Ubuntu 14.04, kernel 3.13.0-96, 64-bit<br></div>GNU Radio version is \
v3.7.9.2<br></div>If more information is required, please let me know \
it.<br><div><div><div><div><br></div><div>Regards,<br></div><div>Jeon.<br></div></div></div></div></div>
 </blockquote></div><br></div>



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