Re: [Discuss-gnuradio] Custom block overflow

[sarankumar]

Hi,

There is no throttle block in my flow graph. The USRP source is directly connected to the custom block.

In the custom block, I form a 4x8 matrix with 4 being number of USRP's and 8 is the number of samples from each of them.

Then I do cross co-variance of the matrix(4x8) with its transpose(8x4). The resulting 4x4 matrix is inverted. 

I use Armadillo linear algebra package for the co-variance and inverse operations. The computer is equipped with 8 Gig ram and gigabit ethernet card.

Regards,

Saran

On Wed, Feb 5, 2014 at 2:56 PM, Marcus Müller <address@hidden> wrote:

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Also, since this is a very common mistake:
Maybe you have a throttle block in your flowgraph.
If that's the case, remove it.

Greetings,
Marcus

(Um, how do you invert a 4x8 matrix?)

On 05.02.2014 03:52, Martin Braun wrote:
> On 04.02.2014 18:46, sarankumar wrote:
>> Hi all, I am encountering overflow errors in my custom block in
>> GRC even for low USRP sample rates of 500 Ksps. The flow graph
>> goes like 4 USRP's connected to the custom block. The block does
>> matrix correlation and inverse. The size of the matrix is 4x8.
>> Any help? Regards, Saran
>
> Your flow graph is probably running too slowly. You could record IQ
> data and try w/ offline data.
>
> MB
>
>
> _______________________________________________ Discuss-gnuradio
> mailing list address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

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